214 //------------------------------------------------------------------------------ |
78 //------------------------------------------------------------------------------ |
215 // MethodHandlesAdapterGenerator::generate |
79 // MethodHandlesAdapterGenerator::generate |
216 // |
80 // |
217 void MethodHandlesAdapterGenerator::generate() { |
81 void MethodHandlesAdapterGenerator::generate() { |
218 // Generate generic method handle adapters. |
82 // Generate generic method handle adapters. |
219 for (MethodHandles::EntryKind ek = MethodHandles::_EK_FIRST; |
83 // Generate interpreter entries |
220 ek < MethodHandles::_EK_LIMIT; |
84 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; |
221 ek = MethodHandles::EntryKind(1 + (int)ek)) { |
85 mk <= Interpreter::method_handle_invoke_LAST; |
222 if (MethodHandles::ek_supported(ek)) { |
86 mk = Interpreter::MethodKind(1 + (int)mk)) { |
223 StubCodeMark mark(this, "MethodHandle", MethodHandles::entry_name(ek)); |
87 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); |
224 MethodHandles::generate_method_handle_stub(_masm, ek); |
88 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); |
225 } |
89 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); |
226 } |
90 if (entry != NULL) { |
227 } |
91 Interpreter::set_entry_for_kind(mk, entry); |
228 |
92 } |
229 |
93 // If the entry is not set, it will throw AbstractMethodError. |
230 //------------------------------------------------------------------------------ |
94 } |
231 // MethodHandles::ek_supported |
95 } |
232 // |
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233 bool MethodHandles::ek_supported(MethodHandles::EntryKind ek) { |
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234 MethodHandles::EntryKind ek_orig = MethodHandles::ek_original_kind(ek); |
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235 switch (ek_orig) { |
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236 case _adapter_unused_13: |
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237 return false; // not defined yet |
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238 case _adapter_prim_to_ref: |
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239 return conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF); |
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240 case _adapter_collect_args: |
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241 return conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS); |
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242 case _adapter_fold_args: |
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243 return conv_op_supported(java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS); |
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244 } |
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245 return true; |
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246 } |
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247 |
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248 |
96 |
249 void MethodHandles::set_enabled(bool z) { |
97 void MethodHandles::set_enabled(bool z) { |
250 if (_enabled != z) { |
98 if (_enabled != z) { |
251 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic"); |
99 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic"); |
252 _enabled = z; |
100 _enabled = z; |
253 } |
101 } |
254 } |
102 } |
255 |
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256 // Note: A method which does not have a TRAPS argument cannot block in the GC |
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257 // or throw exceptions. Such methods are used in this file to do something quick |
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258 // and local, like parse a data structure. For speed, such methods work on plain |
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259 // oops, not handles. Trapping methods uniformly operate on handles. |
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260 |
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261 methodHandle MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype, |
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262 KlassHandle& receiver_limit_result, int& decode_flags_result) { |
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263 if (vmtarget == NULL) return methodHandle(); |
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264 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding"); |
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265 if (vmindex < 0) { |
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266 // this DMH performs no dispatch; it is directly bound to a methodOop |
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267 // A MemberName may either be directly bound to a methodOop, |
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268 // or it may use the klass/index form; both forms mean the same thing. |
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269 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result); |
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270 if ((decode_flags_result & _dmf_has_receiver) != 0 |
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271 && java_lang_invoke_MethodType::is_instance(mtype)) { |
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272 // Extract receiver type restriction from mtype.ptypes[0]. |
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273 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(mtype); |
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274 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0); |
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275 if (java_lang_Class::is_instance(ptype0)) |
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276 receiver_limit_result = java_lang_Class::as_klassOop(ptype0); |
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277 } |
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278 if (vmindex == methodOopDesc::nonvirtual_vtable_index) { |
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279 // this DMH can be an "invokespecial" version |
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280 decode_flags_result &= ~_dmf_does_dispatch; |
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281 } else { |
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282 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?"); |
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283 } |
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284 return m; |
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285 } else { |
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286 assert(vmtarget->is_klass(), "must be class or interface"); |
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287 decode_flags_result |= MethodHandles::_dmf_does_dispatch; |
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288 decode_flags_result |= MethodHandles::_dmf_has_receiver; |
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289 receiver_limit_result = (klassOop)vmtarget; |
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290 Klass* tk = Klass::cast((klassOop)vmtarget); |
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291 if (tk->is_interface()) { |
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292 // an itable linkage is <interface, itable index> |
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293 decode_flags_result |= MethodHandles::_dmf_from_interface; |
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294 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex); |
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295 } else { |
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296 if (!tk->oop_is_instance()) |
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297 tk = instanceKlass::cast(SystemDictionary::Object_klass()); |
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298 return ((instanceKlass*)tk)->method_at_vtable(vmindex); |
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299 } |
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300 } |
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301 } |
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302 |
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303 // MemberName and DirectMethodHandle have the same linkage to the JVM internals. |
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304 // (MemberName is the non-operational name used for queries and setup.) |
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305 |
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306 methodHandle MethodHandles::decode_DirectMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) { |
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307 oop vmtarget = java_lang_invoke_DirectMethodHandle::vmtarget(mh); |
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308 int vmindex = java_lang_invoke_DirectMethodHandle::vmindex(mh); |
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309 oop mtype = java_lang_invoke_DirectMethodHandle::type(mh); |
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310 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result); |
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311 } |
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312 |
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313 methodHandle MethodHandles::decode_BoundMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) { |
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314 assert(java_lang_invoke_BoundMethodHandle::is_instance(mh), ""); |
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315 assert(mh->klass() != SystemDictionary::AdapterMethodHandle_klass(), ""); |
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316 for (oop bmh = mh;;) { |
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317 // Bound MHs can be stacked to bind several arguments. |
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318 oop target = java_lang_invoke_MethodHandle::vmtarget(bmh); |
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319 if (target == NULL) return methodHandle(); |
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320 decode_flags_result |= MethodHandles::_dmf_binds_argument; |
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321 klassOop tk = target->klass(); |
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322 if (tk == SystemDictionary::BoundMethodHandle_klass()) { |
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323 bmh = target; |
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324 continue; |
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325 } else { |
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326 if (java_lang_invoke_MethodHandle::is_subclass(tk)) { |
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327 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH"); |
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328 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result); |
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329 } else { |
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330 // Optimized case: binding a receiver to a non-dispatched DMH |
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331 // short-circuits directly to the methodOop. |
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332 // (It might be another argument besides a receiver also.) |
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333 assert(target->is_method(), "must be a simple method"); |
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334 decode_flags_result |= MethodHandles::_dmf_binds_method; |
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335 methodOop m = (methodOop) target; |
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336 if (!m->is_static()) |
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337 decode_flags_result |= MethodHandles::_dmf_has_receiver; |
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338 return m; |
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339 } |
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340 } |
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341 } |
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342 } |
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343 |
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344 methodHandle MethodHandles::decode_AdapterMethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) { |
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345 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), ""); |
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346 for (oop amh = mh;;) { |
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347 // Adapter MHs can be stacked to convert several arguments. |
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348 int conv_op = adapter_conversion_op(java_lang_invoke_AdapterMethodHandle::conversion(amh)); |
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349 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK; |
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350 oop target = java_lang_invoke_MethodHandle::vmtarget(amh); |
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351 if (target == NULL) return methodHandle(); |
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352 klassOop tk = target->klass(); |
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353 if (tk == SystemDictionary::AdapterMethodHandle_klass()) { |
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354 amh = target; |
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355 continue; |
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356 } else { |
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357 // must be a BMH (which will bind some more arguments) or a DMH (for the final call) |
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358 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result); |
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359 } |
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360 } |
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361 } |
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362 |
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363 methodHandle MethodHandles::decode_MethodHandle(oop mh, KlassHandle& receiver_limit_result, int& decode_flags_result) { |
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364 if (mh == NULL) return methodHandle(); |
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365 klassOop mhk = mh->klass(); |
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366 assert(java_lang_invoke_MethodHandle::is_subclass(mhk), "must be a MethodHandle"); |
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367 if (mhk == SystemDictionary::DirectMethodHandle_klass()) { |
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368 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result); |
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369 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) { |
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370 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); |
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371 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) { |
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372 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result); |
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373 } else if (java_lang_invoke_BoundMethodHandle::is_subclass(mhk)) { |
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374 // could be a JavaMethodHandle (but not an adapter MH) |
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375 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); |
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376 } else { |
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377 assert(false, "cannot parse this MH"); |
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378 return methodHandle(); // random MH? |
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379 } |
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380 } |
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381 |
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382 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) { |
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383 assert(m->is_method(), ""); |
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384 if (m->is_static()) { |
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385 // check that signature begins '(L' or '([' (not '(I', '()', etc.) |
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386 Symbol* sig = m->signature(); |
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387 BasicType recv_bt = char2type(sig->byte_at(1)); |
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388 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')' |
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389 assert(sig->byte_at(0) == '(', "must be method sig"); |
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390 // if (recv_bt == T_OBJECT || recv_bt == T_ARRAY) |
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391 // decode_flags_result |= _dmf_has_receiver; |
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392 } else { |
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393 // non-static method |
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394 decode_flags_result |= _dmf_has_receiver; |
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395 if (!m->can_be_statically_bound() && !m->is_initializer()) { |
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396 decode_flags_result |= _dmf_does_dispatch; |
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397 if (Klass::cast(m->method_holder())->is_interface()) |
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398 decode_flags_result |= _dmf_from_interface; |
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399 } |
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400 } |
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401 return m; |
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402 } |
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403 |
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404 |
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405 // A trusted party is handing us a cookie to determine a method. |
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406 // Let's boil it down to the method oop they really want. |
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407 methodHandle MethodHandles::decode_method(oop x, KlassHandle& receiver_limit_result, int& decode_flags_result) { |
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408 decode_flags_result = 0; |
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409 receiver_limit_result = KlassHandle(); |
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410 klassOop xk = x->klass(); |
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411 if (xk == Universe::methodKlassObj()) { |
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412 return decode_methodOop((methodOop) x, decode_flags_result); |
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413 } else if (xk == SystemDictionary::MemberName_klass()) { |
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414 // Note: This only works if the MemberName has already been resolved. |
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415 return decode_MemberName(x, receiver_limit_result, decode_flags_result); |
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416 } else if (java_lang_invoke_MethodHandle::is_subclass(xk)) { |
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417 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result); |
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418 } else if (xk == SystemDictionary::reflect_Method_klass()) { |
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419 oop clazz = java_lang_reflect_Method::clazz(x); |
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420 int slot = java_lang_reflect_Method::slot(x); |
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421 klassOop k = java_lang_Class::as_klassOop(clazz); |
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422 if (k != NULL && Klass::cast(k)->oop_is_instance()) |
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423 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), |
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424 decode_flags_result); |
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425 } else if (xk == SystemDictionary::reflect_Constructor_klass()) { |
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426 oop clazz = java_lang_reflect_Constructor::clazz(x); |
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427 int slot = java_lang_reflect_Constructor::slot(x); |
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428 klassOop k = java_lang_Class::as_klassOop(clazz); |
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429 if (k != NULL && Klass::cast(k)->oop_is_instance()) |
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430 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), |
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431 decode_flags_result); |
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432 } else { |
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433 // unrecognized object |
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434 assert(!x->is_method(), "already checked"); |
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435 assert(!java_lang_invoke_MemberName::is_instance(x), "already checked"); |
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436 } |
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437 return methodHandle(); |
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438 } |
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439 |
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440 |
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441 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) { |
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442 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass()) |
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443 return 0; // no push/pop |
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444 int this_vmslots = java_lang_invoke_MethodHandle::vmslots(mh); |
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445 int last_vmslots = 0; |
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446 oop last_mh = mh; |
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447 for (;;) { |
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448 oop target = java_lang_invoke_MethodHandle::vmtarget(last_mh); |
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449 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { |
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450 last_vmslots = java_lang_invoke_MethodHandle::vmslots(target); |
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451 break; |
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452 } else if (!java_lang_invoke_MethodHandle::is_instance(target)) { |
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453 // might be klass or method |
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454 assert(target->is_method(), "must get here with a direct ref to method"); |
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455 last_vmslots = methodOop(target)->size_of_parameters(); |
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456 break; |
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457 } |
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458 last_mh = target; |
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459 } |
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460 // If I am called with fewer VM slots than my ultimate callee, |
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461 // it must be that I push the additionally needed slots. |
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462 // Likewise if am called with more VM slots, I will pop them. |
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463 return (last_vmslots - this_vmslots); |
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464 } |
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465 |
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466 |
103 |
467 // MemberName support |
104 // MemberName support |
468 |
105 |
469 // import java_lang_invoke_MemberName.* |
106 // import java_lang_invoke_MemberName.* |
470 enum { |
107 enum { |
471 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, |
108 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, |
472 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, |
109 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, |
473 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, |
110 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, |
474 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, |
111 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, |
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112 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, |
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113 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, |
475 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, |
114 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, |
476 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, |
115 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, |
477 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE, |
116 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE |
478 VM_INDEX_UNINITIALIZED = java_lang_invoke_MemberName::VM_INDEX_UNINITIALIZED |
|
479 }; |
117 }; |
480 |
118 |
481 Handle MethodHandles::new_MemberName(TRAPS) { |
119 Handle MethodHandles::new_MemberName(TRAPS) { |
482 Handle empty; |
120 Handle empty; |
483 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); |
121 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); |
484 if (!k->is_initialized()) k->initialize(CHECK_(empty)); |
122 if (!k->is_initialized()) k->initialize(CHECK_(empty)); |
485 return Handle(THREAD, k->allocate_instance(THREAD)); |
123 return Handle(THREAD, k->allocate_instance(THREAD)); |
486 } |
124 } |
487 |
125 |
488 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) { |
126 oop MethodHandles::init_MemberName(oop mname_oop, oop target_oop) { |
489 if (target_oop->klass() == SystemDictionary::reflect_Field_klass()) { |
127 klassOop target_klass = target_oop->klass(); |
|
128 if (target_klass == SystemDictionary::reflect_Field_klass()) { |
490 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() |
129 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() |
491 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() |
130 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() |
492 int mods = java_lang_reflect_Field::modifiers(target_oop); |
131 int mods = java_lang_reflect_Field::modifiers(target_oop); |
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132 oop type = java_lang_reflect_Field::type(target_oop); |
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133 oop name = java_lang_reflect_Field::name(target_oop); |
493 klassOop k = java_lang_Class::as_klassOop(clazz); |
134 klassOop k = java_lang_Class::as_klassOop(clazz); |
494 int offset = instanceKlass::cast(k)->field_offset(slot); |
135 intptr_t offset = instanceKlass::cast(k)->field_offset(slot); |
495 init_MemberName(mname_oop, k, accessFlags_from(mods), offset); |
136 return init_field_MemberName(mname_oop, k, accessFlags_from(mods), type, name, offset); |
|
137 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { |
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138 oop clazz = java_lang_reflect_Method::clazz(target_oop); |
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139 int slot = java_lang_reflect_Method::slot(target_oop); |
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140 klassOop k = java_lang_Class::as_klassOop(clazz); |
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141 if (k != NULL && Klass::cast(k)->oop_is_instance()) { |
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142 methodOop m = instanceKlass::cast(k)->method_with_idnum(slot); |
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143 return init_method_MemberName(mname_oop, m, true, k); |
|
144 } |
|
145 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { |
|
146 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); |
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147 int slot = java_lang_reflect_Constructor::slot(target_oop); |
|
148 klassOop k = java_lang_Class::as_klassOop(clazz); |
|
149 if (k != NULL && Klass::cast(k)->oop_is_instance()) { |
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150 methodOop m = instanceKlass::cast(k)->method_with_idnum(slot); |
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151 return init_method_MemberName(mname_oop, m, false, k); |
|
152 } |
|
153 } else if (target_klass == SystemDictionary::MemberName_klass()) { |
|
154 // Note: This only works if the MemberName has already been resolved. |
|
155 oop clazz = java_lang_invoke_MemberName::clazz(target_oop); |
|
156 int flags = java_lang_invoke_MemberName::flags(target_oop); |
|
157 oop vmtarget = java_lang_invoke_MemberName::vmtarget(target_oop); |
|
158 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(target_oop); |
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159 klassOop k = java_lang_Class::as_klassOop(clazz); |
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160 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; |
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161 if (vmtarget == NULL) return NULL; // not resolved |
|
162 if ((flags & IS_FIELD) != 0) { |
|
163 assert(vmtarget->is_klass(), "field vmtarget is klassOop"); |
|
164 int basic_mods = (ref_kind_is_static(ref_kind) ? JVM_ACC_STATIC : 0); |
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165 // FIXME: how does k (receiver_limit) contribute? |
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166 return init_field_MemberName(mname_oop, klassOop(vmtarget), accessFlags_from(basic_mods), NULL, NULL, vmindex); |
|
167 } else if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { |
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168 assert(vmtarget->is_method(), "method or constructor vmtarget is methodOop"); |
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169 return init_method_MemberName(mname_oop, methodOop(vmtarget), ref_kind_does_dispatch(ref_kind), k); |
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170 } else { |
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171 return NULL; |
|
172 } |
|
173 } |
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174 return NULL; |
|
175 } |
|
176 |
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177 oop MethodHandles::init_method_MemberName(oop mname_oop, methodOop m, bool do_dispatch, |
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178 klassOop receiver_limit) { |
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179 AccessFlags mods = m->access_flags(); |
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180 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); |
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181 int vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch |
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182 klassOop mklass = m->method_holder(); |
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183 if (receiver_limit == NULL) |
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184 receiver_limit = mklass; |
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185 if (m->is_initializer()) { |
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186 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); |
|
187 } else if (mods.is_static()) { |
|
188 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); |
|
189 } else if (receiver_limit != mklass && |
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190 !Klass::cast(receiver_limit)->is_subtype_of(mklass)) { |
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191 return NULL; // bad receiver limit |
|
192 } else if (Klass::cast(receiver_limit)->is_interface() && |
|
193 Klass::cast(mklass)->is_interface()) { |
|
194 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); |
|
195 receiver_limit = mklass; // ignore passed-in limit; interfaces are interconvertible |
|
196 vmindex = klassItable::compute_itable_index(m); |
|
197 } else if (mklass != receiver_limit && Klass::cast(mklass)->is_interface()) { |
|
198 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); |
|
199 // it is a miranda method, so m->vtable_index is not what we want |
|
200 ResourceMark rm; |
|
201 klassVtable* vt = instanceKlass::cast(receiver_limit)->vtable(); |
|
202 vmindex = vt->index_of_miranda(m->name(), m->signature()); |
|
203 } else if (!do_dispatch || m->can_be_statically_bound()) { |
|
204 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); |
496 } else { |
205 } else { |
497 KlassHandle receiver_limit; int decode_flags = 0; |
206 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); |
498 methodHandle m = MethodHandles::decode_method(target_oop, receiver_limit, decode_flags); |
207 vmindex = m->vtable_index(); |
499 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); |
208 } |
500 init_MemberName(mname_oop, m(), do_dispatch); |
209 |
501 } |
210 java_lang_invoke_MemberName::set_flags(mname_oop, flags); |
502 } |
211 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m); |
503 |
212 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index |
504 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) { |
213 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(receiver_limit)->java_mirror()); |
505 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD) |
214 // Note: name and type can be lazily computed by resolve_MemberName, |
506 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS )); |
215 // if Java code needs them as resolved String and MethodType objects. |
507 oop vmtarget = m; |
216 // The clazz must be eagerly stored, because it provides a GC |
508 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet |
217 // root to help keep alive the methodOop. |
509 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound()) |
218 // If relevant, the vtable or itable value is stored as vmindex. |
510 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch |
219 // This is done eagerly, since it is readily available without |
511 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value"); |
220 // constructing any new objects. |
|
221 // TO DO: maybe intern mname_oop |
|
222 return mname_oop; |
|
223 } |
|
224 |
|
225 Handle MethodHandles::init_method_MemberName(oop mname_oop, CallInfo& info, TRAPS) { |
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226 Handle empty; |
|
227 if (info.resolved_appendix().not_null()) { |
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228 // The resolved MemberName must not be accompanied by an appendix argument, |
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229 // since there is no way to bind this value into the MemberName. |
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230 // Caller is responsible to prevent this from happening. |
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231 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); |
|
232 } |
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233 methodHandle m = info.resolved_method(); |
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234 KlassHandle defc = info.resolved_klass(); |
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235 int vmindex = -1; |
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236 if (defc->is_interface() && Klass::cast(m->method_holder())->is_interface()) { |
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237 // LinkResolver does not report itable indexes! (fix this?) |
|
238 vmindex = klassItable::compute_itable_index(m()); |
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239 } else if (m->can_be_statically_bound()) { |
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240 // LinkResolver reports vtable index even for final methods! |
|
241 vmindex = methodOopDesc::nonvirtual_vtable_index; |
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242 } else { |
|
243 vmindex = info.vtable_index(); |
|
244 } |
|
245 oop res = init_method_MemberName(mname_oop, m(), (vmindex >= 0), defc()); |
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246 assert(res == NULL || (java_lang_invoke_MemberName::vmindex(res) == vmindex), ""); |
|
247 return Handle(THREAD, res); |
|
248 } |
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249 |
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250 oop MethodHandles::init_field_MemberName(oop mname_oop, klassOop field_holder, |
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251 AccessFlags mods, oop type, oop name, |
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252 intptr_t offset, bool is_setter) { |
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253 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); |
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254 flags |= IS_FIELD | ((mods.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); |
|
255 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); |
|
256 oop vmtarget = field_holder; |
|
257 int vmindex = offset; // determines the field uniquely when combined with static bit |
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258 java_lang_invoke_MemberName::set_flags(mname_oop, flags); |
512 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); |
259 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); |
513 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); |
260 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); |
514 java_lang_invoke_MemberName::set_flags(mname_oop, flags); |
|
515 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(m->method_holder())->java_mirror()); |
|
516 } |
|
517 |
|
518 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) { |
|
519 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS )); |
|
520 oop vmtarget = field_holder; |
|
521 int vmindex = offset; // determines the field uniquely when combined with static bit |
|
522 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex"); |
|
523 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); |
|
524 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); |
|
525 java_lang_invoke_MemberName::set_flags(mname_oop, flags); |
|
526 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror()); |
261 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(field_holder)->java_mirror()); |
527 } |
262 if (name != NULL) |
528 |
263 java_lang_invoke_MemberName::set_name(mname_oop, name); |
529 |
264 if (type != NULL) |
530 methodHandle MethodHandles::decode_MemberName(oop mname, KlassHandle& receiver_limit_result, int& decode_flags_result) { |
265 java_lang_invoke_MemberName::set_type(mname_oop, type); |
531 methodHandle empty; |
266 // Note: name and type can be lazily computed by resolve_MemberName, |
532 int flags = java_lang_invoke_MemberName::flags(mname); |
267 // if Java code needs them as resolved String and Class objects. |
533 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return empty; // not invocable |
268 // Note that the incoming type oop might be pre-resolved (non-null). |
534 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname); |
269 // The base clazz and field offset (vmindex) must be eagerly stored, |
535 int vmindex = java_lang_invoke_MemberName::vmindex(mname); |
270 // because they unambiguously identify the field. |
536 if (vmindex == VM_INDEX_UNINITIALIZED) return empty; // not resolved |
271 // Although the fieldDescriptor::_index would also identify the field, |
537 methodHandle m = decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result); |
272 // we do not use it, because it is harder to decode. |
538 oop clazz = java_lang_invoke_MemberName::clazz(mname); |
273 // TO DO: maybe intern mname_oop |
539 if (clazz != NULL && java_lang_Class::is_instance(clazz)) { |
274 return mname_oop; |
540 klassOop klass = java_lang_Class::as_klassOop(clazz); |
275 } |
541 if (klass != NULL) receiver_limit_result = klass; |
276 |
542 } |
277 Handle MethodHandles::init_field_MemberName(oop mname_oop, FieldAccessInfo& info, TRAPS) { |
543 return m; |
278 return Handle(); |
544 } |
279 #if 0 |
|
280 KlassHandle field_holder = info.klass(); |
|
281 intptr_t field_offset = info.field_offset(); |
|
282 return init_field_MemberName(mname_oop, field_holder(), |
|
283 info.access_flags(), |
|
284 type, name, |
|
285 field_offset, false /*is_setter*/); |
|
286 #endif |
|
287 } |
|
288 |
|
289 |
|
290 // JVM 2.9 Special Methods: |
|
291 // A method is signature polymorphic if and only if all of the following conditions hold : |
|
292 // * It is declared in the java.lang.invoke.MethodHandle class. |
|
293 // * It has a single formal parameter of type Object[]. |
|
294 // * It has a return type of Object. |
|
295 // * It has the ACC_VARARGS and ACC_NATIVE flags set. |
|
296 bool MethodHandles::is_method_handle_invoke_name(klassOop klass, Symbol* name) { |
|
297 if (klass == NULL) |
|
298 return false; |
|
299 // The following test will fail spuriously during bootstrap of MethodHandle itself: |
|
300 // if (klass != SystemDictionary::MethodHandle_klass()) |
|
301 // Test the name instead: |
|
302 if (Klass::cast(klass)->name() != vmSymbols::java_lang_invoke_MethodHandle()) |
|
303 return false; |
|
304 Symbol* poly_sig = vmSymbols::object_array_object_signature(); |
|
305 methodOop m = instanceKlass::cast(klass)->find_method(name, poly_sig); |
|
306 if (m == NULL) return false; |
|
307 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; |
|
308 int flags = m->access_flags().as_int(); |
|
309 return (flags & required) == required; |
|
310 } |
|
311 |
|
312 |
|
313 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { |
|
314 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid)); |
|
315 switch (iid) { |
|
316 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); |
|
317 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); |
|
318 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); |
|
319 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); |
|
320 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); |
|
321 } |
|
322 assert(false, ""); |
|
323 return 0; |
|
324 } |
|
325 |
|
326 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { |
|
327 switch (iid) { |
|
328 case vmIntrinsics::_invokeBasic: return 0; |
|
329 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; |
|
330 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; |
|
331 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; |
|
332 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; |
|
333 } |
|
334 assert(false, err_msg("iid=%d", iid)); |
|
335 return 0; |
|
336 } |
|
337 |
|
338 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { |
|
339 vmSymbols::SID name_id = vmSymbols::find_sid(name); |
|
340 switch (name_id) { |
|
341 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. |
|
342 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; |
|
343 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: |
|
344 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; |
|
345 |
|
346 // There is one static signature-polymorphic method for each JVM invocation mode. |
|
347 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; |
|
348 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; |
|
349 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; |
|
350 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; |
|
351 } |
|
352 |
|
353 // Cover the case of invokeExact and any future variants of invokeFoo. |
|
354 klassOop mh_klass = SystemDictionary::well_known_klass( |
|
355 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); |
|
356 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) |
|
357 return vmIntrinsics::_invokeGeneric; |
|
358 |
|
359 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. |
|
360 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. |
|
361 return vmIntrinsics::_none; |
|
362 } |
|
363 |
|
364 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(klassOop klass, Symbol* name) { |
|
365 if (klass != NULL && |
|
366 Klass::cast(klass)->name() == vmSymbols::java_lang_invoke_MethodHandle()) { |
|
367 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); |
|
368 if (iid != vmIntrinsics::_none) |
|
369 return iid; |
|
370 if (is_method_handle_invoke_name(klass, name)) |
|
371 return vmIntrinsics::_invokeGeneric; |
|
372 } |
|
373 return vmIntrinsics::_none; |
|
374 } |
|
375 |
545 |
376 |
546 // convert the external string or reflective type to an internal signature |
377 // convert the external string or reflective type to an internal signature |
547 Symbol* MethodHandles::convert_to_signature(oop type_str, bool polymorphic, TRAPS) { |
378 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { |
548 if (java_lang_invoke_MethodType::is_instance(type_str)) { |
379 if (java_lang_invoke_MethodType::is_instance(type_str)) { |
549 return java_lang_invoke_MethodType::as_signature(type_str, polymorphic, CHECK_NULL); |
380 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL); |
550 } else if (java_lang_Class::is_instance(type_str)) { |
381 } else if (java_lang_Class::is_instance(type_str)) { |
551 return java_lang_Class::as_signature(type_str, false, CHECK_NULL); |
382 return java_lang_Class::as_signature(type_str, false, CHECK_NULL); |
552 } else if (java_lang_String::is_instance(type_str)) { |
383 } else if (java_lang_String::is_instance(type_str)) { |
553 if (polymorphic) { |
384 if (intern_if_not_found) { |
554 return java_lang_String::as_symbol(type_str, CHECK_NULL); |
385 return java_lang_String::as_symbol(type_str, CHECK_NULL); |
555 } else { |
386 } else { |
556 return java_lang_String::as_symbol_or_null(type_str); |
387 return java_lang_String::as_symbol_or_null(type_str); |
557 } |
388 } |
558 } else { |
389 } else { |
559 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); |
390 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); |
560 } |
391 } |
561 } |
392 } |
562 |
393 |
|
394 static const char OBJ_SIG[] = "Ljava/lang/Object;"; |
|
395 enum { OBJ_SIG_LEN = 18 }; |
|
396 |
|
397 bool MethodHandles::is_basic_type_signature(Symbol* sig) { |
|
398 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); |
|
399 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); |
|
400 const int len = sig->utf8_length(); |
|
401 for (int i = 0; i < len; i++) { |
|
402 switch (sig->byte_at(i)) { |
|
403 case 'L': |
|
404 // only java/lang/Object is valid here |
|
405 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) |
|
406 return false; |
|
407 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop |
|
408 continue; |
|
409 case '(': case ')': case 'V': |
|
410 case 'I': case 'J': case 'F': case 'D': |
|
411 continue; |
|
412 //case '[': |
|
413 //case 'Z': case 'B': case 'C': case 'S': |
|
414 default: |
|
415 return false; |
|
416 } |
|
417 } |
|
418 return true; |
|
419 } |
|
420 |
|
421 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { |
|
422 Symbol* bsig = NULL; |
|
423 if (sig == NULL) { |
|
424 return sig; |
|
425 } else if (is_basic_type_signature(sig)) { |
|
426 sig->increment_refcount(); |
|
427 return sig; // that was easy |
|
428 } else if (sig->byte_at(0) != '(') { |
|
429 BasicType bt = char2type(sig->byte_at(0)); |
|
430 if (is_subword_type(bt)) { |
|
431 bsig = vmSymbols::int_signature(); |
|
432 } else { |
|
433 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); |
|
434 bsig = vmSymbols::object_signature(); |
|
435 } |
|
436 } else { |
|
437 ResourceMark rm; |
|
438 stringStream buffer(128); |
|
439 buffer.put('('); |
|
440 int arg_pos = 0, keep_arg_pos = -1; |
|
441 if (keep_last_arg) |
|
442 keep_arg_pos = ArgumentCount(sig).size() - 1; |
|
443 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { |
|
444 BasicType bt = ss.type(); |
|
445 size_t this_arg_pos = buffer.size(); |
|
446 if (ss.at_return_type()) { |
|
447 buffer.put(')'); |
|
448 } |
|
449 if (arg_pos == keep_arg_pos) { |
|
450 buffer.write((char*) ss.raw_bytes(), |
|
451 (int) ss.raw_length()); |
|
452 } else if (bt == T_OBJECT || bt == T_ARRAY) { |
|
453 buffer.write(OBJ_SIG, OBJ_SIG_LEN); |
|
454 } else { |
|
455 if (is_subword_type(bt)) |
|
456 bt = T_INT; |
|
457 buffer.put(type2char(bt)); |
|
458 } |
|
459 arg_pos++; |
|
460 } |
|
461 const char* sigstr = buffer.base(); |
|
462 int siglen = (int) buffer.size(); |
|
463 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); |
|
464 } |
|
465 assert(is_basic_type_signature(bsig) || |
|
466 // detune assert in case the injected argument is not a basic type: |
|
467 keep_last_arg, ""); |
|
468 return bsig; |
|
469 } |
|
470 |
|
471 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, |
|
472 Symbol* sig, |
|
473 bool keep_arrays, |
|
474 bool keep_basic_names) { |
|
475 st = st ? st : tty; |
|
476 int len = sig->utf8_length(); |
|
477 int array = 0; |
|
478 bool prev_type = false; |
|
479 for (int i = 0; i < len; i++) { |
|
480 char ch = sig->byte_at(i); |
|
481 switch (ch) { |
|
482 case '(': case ')': |
|
483 prev_type = false; |
|
484 st->put(ch); |
|
485 continue; |
|
486 case '[': |
|
487 if (!keep_basic_names && keep_arrays) |
|
488 st->put(ch); |
|
489 array++; |
|
490 continue; |
|
491 case 'L': |
|
492 { |
|
493 if (prev_type) st->put(','); |
|
494 int start = i+1, slash = start; |
|
495 while (++i < len && (ch = sig->byte_at(i)) != ';') { |
|
496 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; |
|
497 } |
|
498 if (slash < i) start = slash; |
|
499 if (!keep_basic_names) { |
|
500 st->put('L'); |
|
501 } else { |
|
502 for (int j = start; j < i; j++) |
|
503 st->put(sig->byte_at(j)); |
|
504 prev_type = true; |
|
505 } |
|
506 break; |
|
507 } |
|
508 default: |
|
509 { |
|
510 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { |
|
511 ch = '['; |
|
512 array = 0; |
|
513 } |
|
514 if (prev_type) st->put(','); |
|
515 const char* n = NULL; |
|
516 if (keep_basic_names) |
|
517 n = type2name(char2type(ch)); |
|
518 if (n == NULL) { |
|
519 // unknown letter, or we don't want to know its name |
|
520 st->put(ch); |
|
521 } else { |
|
522 st->print(n); |
|
523 prev_type = true; |
|
524 } |
|
525 break; |
|
526 } |
|
527 } |
|
528 // Switch break goes here to take care of array suffix: |
|
529 if (prev_type) { |
|
530 while (array > 0) { |
|
531 st->print("[]"); |
|
532 --array; |
|
533 } |
|
534 } |
|
535 array = 0; |
|
536 } |
|
537 } |
|
538 |
|
539 |
|
540 |
|
541 static oop object_java_mirror() { |
|
542 return Klass::cast(SystemDictionary::Object_klass())->java_mirror(); |
|
543 } |
|
544 |
|
545 static oop field_name_or_null(Symbol* s) { |
|
546 if (s == NULL) return NULL; |
|
547 return StringTable::lookup(s); |
|
548 } |
|
549 |
|
550 static oop field_signature_type_or_null(Symbol* s) { |
|
551 if (s == NULL) return NULL; |
|
552 BasicType bt = FieldType::basic_type(s); |
|
553 if (is_java_primitive(bt)) { |
|
554 assert(s->utf8_length() == 1, ""); |
|
555 return java_lang_Class::primitive_mirror(bt); |
|
556 } |
|
557 // Here are some more short cuts for common types. |
|
558 // They are optional, since reference types can be resolved lazily. |
|
559 if (bt == T_OBJECT) { |
|
560 if (s == vmSymbols::object_signature()) { |
|
561 return object_java_mirror(); |
|
562 } else if (s == vmSymbols::class_signature()) { |
|
563 return Klass::cast(SystemDictionary::Class_klass())->java_mirror(); |
|
564 } else if (s == vmSymbols::string_signature()) { |
|
565 return Klass::cast(SystemDictionary::String_klass())->java_mirror(); |
|
566 } else { |
|
567 int len = s->utf8_length(); |
|
568 if (s->byte_at(0) == 'L' && s->byte_at(len-1) == ';') { |
|
569 TempNewSymbol cname = SymbolTable::probe((const char*)&s->bytes()[1], len-2); |
|
570 if (cname == NULL) return NULL; |
|
571 klassOop wkk = SystemDictionary::find_well_known_klass(cname); |
|
572 if (wkk == NULL) return NULL; |
|
573 return Klass::cast(wkk)->java_mirror(); |
|
574 } |
|
575 } |
|
576 } |
|
577 return NULL; |
|
578 } |
|
579 |
563 // An unresolved member name is a mere symbolic reference. |
580 // An unresolved member name is a mere symbolic reference. |
564 // Resolving it plants a vmtarget/vmindex in it, |
581 // Resolving it plants a vmtarget/vmindex in it, |
565 // which refers dirctly to JVM internals. |
582 // which refers dirctly to JVM internals. |
566 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) { |
583 Handle MethodHandles::resolve_MemberName(Handle mname, TRAPS) { |
|
584 Handle empty; |
567 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); |
585 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); |
568 #ifdef ASSERT |
586 |
569 // If this assert throws, renegotiate the sentinel value used by the Java code, |
587 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { |
570 // so that it is distinct from any valid vtable index value, and any special |
588 // Already resolved. |
571 // values defined in methodOopDesc::VtableIndexFlag. |
589 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); |
572 // The point of the slop is to give the Java code and the JVM some room |
590 assert(vmindex >= methodOopDesc::nonvirtual_vtable_index, ""); |
573 // to independently specify sentinel values. |
591 return mname; |
574 const int sentinel_slop = 10; |
592 } |
575 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop; |
593 |
576 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels"); |
|
577 #endif |
|
578 if (java_lang_invoke_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED) |
|
579 return; // already resolved |
|
580 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); |
594 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); |
581 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); |
595 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); |
582 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); |
596 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); |
583 int flags = java_lang_invoke_MemberName::flags(mname()); |
597 int flags = java_lang_invoke_MemberName::flags(mname()); |
|
598 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; |
|
599 if (!ref_kind_is_valid(ref_kind)) { |
|
600 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); |
|
601 } |
|
602 |
|
603 DEBUG_ONLY(int old_vmindex); |
|
604 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); |
584 |
605 |
585 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { |
606 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { |
586 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve"); |
607 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); |
587 } |
608 } |
588 |
609 |
589 instanceKlassHandle defc; |
610 instanceKlassHandle defc; |
590 { |
611 { |
591 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop()); |
612 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop()); |
592 if (defc_klassOop == NULL) return; // a primitive; no resolution possible |
613 if (defc_klassOop == NULL) return empty; // a primitive; no resolution possible |
593 if (!Klass::cast(defc_klassOop)->oop_is_instance()) { |
614 if (!Klass::cast(defc_klassOop)->oop_is_instance()) { |
594 if (!Klass::cast(defc_klassOop)->oop_is_array()) return; |
615 if (!Klass::cast(defc_klassOop)->oop_is_array()) return empty; |
595 defc_klassOop = SystemDictionary::Object_klass(); |
616 defc_klassOop = SystemDictionary::Object_klass(); |
596 } |
617 } |
597 defc = instanceKlassHandle(THREAD, defc_klassOop); |
618 defc = instanceKlassHandle(THREAD, defc_klassOop); |
598 } |
619 } |
599 if (defc.is_null()) { |
620 if (defc.is_null()) { |
600 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class"); |
621 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); |
601 } |
622 } |
602 defc->link_class(CHECK); // possible safepoint |
623 defc->link_class(CHECK_(empty)); // possible safepoint |
603 |
624 |
604 // convert the external string name to an internal symbol |
625 // convert the external string name to an internal symbol |
605 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); |
626 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); |
606 if (name == NULL) return; // no such name |
627 if (name == NULL) return empty; // no such name |
607 if (name == vmSymbols::class_initializer_name()) |
628 if (name == vmSymbols::class_initializer_name()) |
608 return; // illegal name |
629 return empty; // illegal name |
609 |
630 |
610 Handle polymorphic_method_type; |
631 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; |
611 bool polymorphic_signature = false; |
|
612 if ((flags & ALL_KINDS) == IS_METHOD && |
632 if ((flags & ALL_KINDS) == IS_METHOD && |
613 (defc() == SystemDictionary::MethodHandle_klass() && |
633 (defc() == SystemDictionary::MethodHandle_klass()) && |
614 methodOopDesc::is_method_handle_invoke_name(name))) { |
634 (ref_kind == JVM_REF_invokeVirtual || |
615 polymorphic_signature = true; |
635 ref_kind == JVM_REF_invokeSpecial || |
|
636 // static invocation mode is required for _linkToVirtual, etc.: |
|
637 ref_kind == JVM_REF_invokeStatic)) { |
|
638 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); |
|
639 if (iid != vmIntrinsics::_none && |
|
640 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { |
|
641 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. |
|
642 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. |
|
643 mh_invoke_id = iid; |
|
644 } |
616 } |
645 } |
617 |
646 |
618 // convert the external string or reflective type to an internal signature |
647 // convert the external string or reflective type to an internal signature |
619 TempNewSymbol type = convert_to_signature(type_str(), polymorphic_signature, CHECK); |
648 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); |
620 if (java_lang_invoke_MethodType::is_instance(type_str()) && polymorphic_signature) { |
649 if (type == NULL) return empty; // no such signature exists in the VM |
621 polymorphic_method_type = type_str; // preserve exactly |
|
622 } |
|
623 if (type == NULL) return; // no such signature exists in the VM |
|
624 |
650 |
625 // Time to do the lookup. |
651 // Time to do the lookup. |
626 switch (flags & ALL_KINDS) { |
652 switch (flags & ALL_KINDS) { |
627 case IS_METHOD: |
653 case IS_METHOD: |
628 { |
654 { |
629 CallInfo result; |
655 CallInfo result; |
|
656 bool do_dispatch = true; // default, neutral setting |
630 { |
657 { |
631 EXCEPTION_MARK; |
658 assert(!HAS_PENDING_EXCEPTION, ""); |
632 if ((flags & JVM_ACC_STATIC) != 0) { |
659 if (ref_kind == JVM_REF_invokeStatic) { |
|
660 //do_dispatch = false; // no need, since statics are never dispatched |
633 LinkResolver::resolve_static_call(result, |
661 LinkResolver::resolve_static_call(result, |
634 defc, name, type, KlassHandle(), false, false, THREAD); |
662 defc, name, type, KlassHandle(), false, false, THREAD); |
635 } else if (defc->is_interface()) { |
663 } else if (ref_kind == JVM_REF_invokeInterface) { |
636 LinkResolver::resolve_interface_call(result, Handle(), defc, |
664 LinkResolver::resolve_interface_call(result, Handle(), defc, |
637 defc, name, type, KlassHandle(), false, false, THREAD); |
665 defc, name, type, KlassHandle(), false, false, THREAD); |
638 } else { |
666 } else if (mh_invoke_id != vmIntrinsics::_none) { |
|
667 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); |
|
668 LinkResolver::resolve_handle_call(result, |
|
669 defc, name, type, KlassHandle(), THREAD); |
|
670 } else if (ref_kind == JVM_REF_invokeSpecial) { |
|
671 do_dispatch = false; // force non-virtual linkage |
|
672 LinkResolver::resolve_special_call(result, |
|
673 defc, name, type, KlassHandle(), false, THREAD); |
|
674 } else if (ref_kind == JVM_REF_invokeVirtual) { |
639 LinkResolver::resolve_virtual_call(result, Handle(), defc, |
675 LinkResolver::resolve_virtual_call(result, Handle(), defc, |
640 defc, name, type, KlassHandle(), false, false, THREAD); |
676 defc, name, type, KlassHandle(), false, false, THREAD); |
|
677 } else { |
|
678 assert(false, err_msg("ref_kind=%d", ref_kind)); |
641 } |
679 } |
642 if (HAS_PENDING_EXCEPTION) { |
680 if (HAS_PENDING_EXCEPTION) { |
643 CLEAR_PENDING_EXCEPTION; |
681 return empty; |
644 break; // go to second chance |
|
645 } |
682 } |
646 } |
683 } |
647 methodHandle m = result.resolved_method(); |
684 return init_method_MemberName(mname(), result, THREAD); |
648 oop vmtarget = NULL; |
|
649 int vmindex = methodOopDesc::nonvirtual_vtable_index; |
|
650 if (defc->is_interface()) { |
|
651 vmindex = klassItable::compute_itable_index(m()); |
|
652 assert(vmindex >= 0, ""); |
|
653 } else if (result.has_vtable_index()) { |
|
654 vmindex = result.vtable_index(); |
|
655 assert(vmindex >= 0, ""); |
|
656 } |
|
657 assert(vmindex != VM_INDEX_UNINITIALIZED, ""); |
|
658 if (vmindex < 0) { |
|
659 assert(result.is_statically_bound(), ""); |
|
660 vmtarget = m(); |
|
661 } else { |
|
662 vmtarget = result.resolved_klass()->as_klassOop(); |
|
663 } |
|
664 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); |
|
665 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget); |
|
666 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex); |
|
667 java_lang_invoke_MemberName::set_modifiers(mname(), mods); |
|
668 DEBUG_ONLY(KlassHandle junk1; int junk2); |
|
669 assert(decode_MemberName(mname(), junk1, junk2) == result.resolved_method(), |
|
670 "properly stored for later decoding"); |
|
671 return; |
|
672 } |
685 } |
673 case IS_CONSTRUCTOR: |
686 case IS_CONSTRUCTOR: |
674 { |
687 { |
675 CallInfo result; |
688 CallInfo result; |
676 { |
689 { |
677 EXCEPTION_MARK; |
690 assert(!HAS_PENDING_EXCEPTION, ""); |
678 if (name == vmSymbols::object_initializer_name()) { |
691 if (name == vmSymbols::object_initializer_name()) { |
679 LinkResolver::resolve_special_call(result, |
692 LinkResolver::resolve_special_call(result, |
680 defc, name, type, KlassHandle(), false, THREAD); |
693 defc, name, type, KlassHandle(), false, THREAD); |
681 } else { |
694 } else { |
682 break; // will throw after end of switch |
695 break; // will throw after end of switch |
683 } |
696 } |
684 if (HAS_PENDING_EXCEPTION) { |
697 if (HAS_PENDING_EXCEPTION) { |
685 CLEAR_PENDING_EXCEPTION; |
698 return empty; |
686 return; |
|
687 } |
699 } |
688 } |
700 } |
689 assert(result.is_statically_bound(), ""); |
701 assert(result.is_statically_bound(), ""); |
690 methodHandle m = result.resolved_method(); |
702 return init_method_MemberName(mname(), result, THREAD); |
691 oop vmtarget = m(); |
|
692 int vmindex = methodOopDesc::nonvirtual_vtable_index; |
|
693 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); |
|
694 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget); |
|
695 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex); |
|
696 java_lang_invoke_MemberName::set_modifiers(mname(), mods); |
|
697 DEBUG_ONLY(KlassHandle junk1; int junk2); |
|
698 assert(decode_MemberName(mname(), junk1, junk2) == result.resolved_method(), |
|
699 "properly stored for later decoding"); |
|
700 return; |
|
701 } |
703 } |
702 case IS_FIELD: |
704 case IS_FIELD: |
703 { |
705 { |
704 // This is taken from LinkResolver::resolve_field, sans access checks. |
706 // This is taken from LinkResolver::resolve_field, sans access checks. |
705 fieldDescriptor fd; // find_field initializes fd if found |
707 fieldDescriptor fd; // find_field initializes fd if found |
706 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name, type, &fd)); |
708 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name, type, &fd)); |
707 // check if field exists; i.e., if a klass containing the field def has been selected |
709 // check if field exists; i.e., if a klass containing the field def has been selected |
708 if (sel_klass.is_null()) return; |
710 if (sel_klass.is_null()) return empty; // should not happen |
709 oop vmtarget = sel_klass->as_klassOop(); |
711 oop type = field_signature_type_or_null(fd.signature()); |
710 int vmindex = fd.offset(); |
712 oop name = field_name_or_null(fd.name()); |
711 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS); |
713 bool is_setter = (ref_kind_is_valid(ref_kind) && ref_kind_is_setter(ref_kind)); |
712 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen |
714 mname = Handle(THREAD, |
713 java_lang_invoke_MemberName::set_vmtarget(mname(), vmtarget); |
715 init_field_MemberName(mname(), sel_klass->as_klassOop(), |
714 java_lang_invoke_MemberName::set_vmindex(mname(), vmindex); |
716 fd.access_flags(), type, name, fd.offset(), is_setter)); |
715 java_lang_invoke_MemberName::set_modifiers(mname(), mods); |
717 return mname; |
716 return; |
|
717 } |
718 } |
718 default: |
719 default: |
719 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); |
720 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); |
720 } |
721 } |
721 |
722 |
722 // Second chance. |
723 return empty; |
723 if (polymorphic_method_type.not_null()) { |
|
724 // Look on a non-null class loader. |
|
725 Handle cur_class_loader; |
|
726 const int nptypes = java_lang_invoke_MethodType::ptype_count(polymorphic_method_type()); |
|
727 for (int i = 0; i <= nptypes; i++) { |
|
728 oop type_mirror; |
|
729 if (i < nptypes) type_mirror = java_lang_invoke_MethodType::ptype(polymorphic_method_type(), i); |
|
730 else type_mirror = java_lang_invoke_MethodType::rtype(polymorphic_method_type()); |
|
731 klassOop example_type = java_lang_Class::as_klassOop(type_mirror); |
|
732 if (example_type == NULL) continue; |
|
733 oop class_loader = Klass::cast(example_type)->class_loader(); |
|
734 if (class_loader == NULL || class_loader == cur_class_loader()) continue; |
|
735 cur_class_loader = Handle(THREAD, class_loader); |
|
736 methodOop m = SystemDictionary::find_method_handle_invoke(name, |
|
737 type, |
|
738 KlassHandle(THREAD, example_type), |
|
739 THREAD); |
|
740 if (HAS_PENDING_EXCEPTION) { |
|
741 CLEAR_PENDING_EXCEPTION; |
|
742 m = NULL; |
|
743 // try again with a different class loader... |
|
744 } |
|
745 if (m != NULL && |
|
746 m->is_method_handle_invoke() && |
|
747 java_lang_invoke_MethodType::equals(polymorphic_method_type(), m->method_handle_type())) { |
|
748 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); |
|
749 java_lang_invoke_MemberName::set_vmtarget(mname(), m); |
|
750 java_lang_invoke_MemberName::set_vmindex(mname(), m->vtable_index()); |
|
751 java_lang_invoke_MemberName::set_modifiers(mname(), mods); |
|
752 return; |
|
753 } |
|
754 } |
|
755 } |
|
756 } |
724 } |
757 |
725 |
758 // Conversely, a member name which is only initialized from JVM internals |
726 // Conversely, a member name which is only initialized from JVM internals |
759 // may have null defc, name, and type fields. |
727 // may have null defc, name, and type fields. |
760 // Resolving it plants a vmtarget/vmindex in it, |
728 // Resolving it plants a vmtarget/vmindex in it, |
761 // which refers directly to JVM internals. |
729 // which refers directly to JVM internals. |
762 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { |
730 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { |
763 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); |
731 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); |
764 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); |
732 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); |
765 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); |
733 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); |
766 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) { |
734 if (vmtarget == NULL) { |
767 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); |
735 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); |
768 } |
736 } |
769 |
737 |
770 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); |
738 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); |
771 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); |
739 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); |
928 --rskip; |
905 --rskip; |
929 } else if (rfill < rlimit) { |
906 } else if (rfill < rlimit) { |
930 oop result = results->obj_at(rfill++); |
907 oop result = results->obj_at(rfill++); |
931 if (!java_lang_invoke_MemberName::is_instance(result)) |
908 if (!java_lang_invoke_MemberName::is_instance(result)) |
932 return -99; // caller bug! |
909 return -99; // caller bug! |
933 MethodHandles::init_MemberName(result, m, true); |
910 oop saved = MethodHandles::init_method_MemberName(result, m, true, NULL); |
|
911 if (saved != result) |
|
912 results->obj_at_put(rfill-1, saved); // show saved instance to user |
934 } else if (++overflow >= overflow_limit) { |
913 } else if (++overflow >= overflow_limit) { |
935 match_flags = 0; break; // got tired of looking at overflow |
914 match_flags = 0; break; // got tired of looking at overflow |
936 } |
915 } |
937 } |
916 } |
938 } |
917 } |
939 |
918 |
940 // return number of elements we at leasted wanted to initialize |
919 // return number of elements we at leasted wanted to initialize |
941 return rfill + overflow; |
920 return rfill + overflow; |
942 } |
921 } |
943 |
922 |
944 |
|
945 // Decode this java.lang.Class object into an instanceKlass, if possible. |
|
946 // Throw IAE if not |
|
947 instanceKlassHandle MethodHandles::resolve_instance_klass(oop java_mirror_oop, TRAPS) { |
|
948 instanceKlassHandle empty; |
|
949 klassOop caller = NULL; |
|
950 if (java_lang_Class::is_instance(java_mirror_oop)) { |
|
951 caller = java_lang_Class::as_klassOop(java_mirror_oop); |
|
952 } |
|
953 if (caller == NULL || !Klass::cast(caller)->oop_is_instance()) { |
|
954 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not a class", empty); |
|
955 } |
|
956 return instanceKlassHandle(THREAD, caller); |
|
957 } |
|
958 |
|
959 |
|
960 |
|
961 // Decode the vmtarget field of a method handle. |
|
962 // Sanitize out methodOops, klassOops, and any other non-Java data. |
|
963 // This is for debugging and reflection. |
|
964 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) { |
|
965 assert(java_lang_invoke_MethodHandle::is_instance(mh()), "must be a MH"); |
|
966 if (format == ETF_FORCE_DIRECT_HANDLE || |
|
967 format == ETF_COMPILE_DIRECT_HANDLE) { |
|
968 // Internal function for stress testing. |
|
969 Handle mt = java_lang_invoke_MethodHandle::type(mh()); |
|
970 int invocation_count = 10000; |
|
971 TempNewSymbol signature = java_lang_invoke_MethodType::as_signature(mt(), true, CHECK_NULL); |
|
972 bool omit_receiver_argument = true; |
|
973 MethodHandleCompiler mhc(mh, vmSymbols::invoke_name(), signature, invocation_count, omit_receiver_argument, CHECK_NULL); |
|
974 methodHandle m = mhc.compile(CHECK_NULL); |
|
975 if (StressMethodHandleWalk && Verbose || PrintMiscellaneous) { |
|
976 tty->print_cr("MethodHandleNatives.getTarget(%s)", |
|
977 format == ETF_FORCE_DIRECT_HANDLE ? "FORCE_DIRECT" : "COMPILE_DIRECT"); |
|
978 if (Verbose) { |
|
979 m->print_codes(); |
|
980 } |
|
981 } |
|
982 if (StressMethodHandleWalk) { |
|
983 InterpreterOopMap mask; |
|
984 OopMapCache::compute_one_oop_map(m, m->code_size() - 1, &mask); |
|
985 } |
|
986 if ((format == ETF_COMPILE_DIRECT_HANDLE || |
|
987 CompilationPolicy::must_be_compiled(m)) |
|
988 && !instanceKlass::cast(m->method_holder())->is_not_initialized() |
|
989 && CompilationPolicy::can_be_compiled(m)) { |
|
990 // Force compilation |
|
991 CompileBroker::compile_method(m, InvocationEntryBci, |
|
992 CompilationPolicy::policy()->initial_compile_level(), |
|
993 methodHandle(), 0, "MethodHandleNatives.getTarget", |
|
994 CHECK_NULL); |
|
995 } |
|
996 // Now wrap m in a DirectMethodHandle. |
|
997 instanceKlassHandle dmh_klass(THREAD, SystemDictionary::DirectMethodHandle_klass()); |
|
998 Handle dmh = dmh_klass->allocate_instance_handle(CHECK_NULL); |
|
999 JavaValue ignore_result(T_VOID); |
|
1000 Symbol* init_name = vmSymbols::object_initializer_name(); |
|
1001 Symbol* init_sig = vmSymbols::notifyGenericMethodType_signature(); |
|
1002 JavaCalls::call_special(&ignore_result, dmh, |
|
1003 SystemDictionaryHandles::MethodHandle_klass(), init_name, init_sig, |
|
1004 java_lang_invoke_MethodHandle::type(mh()), CHECK_NULL); |
|
1005 MethodHandles::init_DirectMethodHandle(dmh, m, false, CHECK_NULL); |
|
1006 return dmh(); |
|
1007 } |
|
1008 if (format == ETF_HANDLE_OR_METHOD_NAME) { |
|
1009 oop target = java_lang_invoke_MethodHandle::vmtarget(mh()); |
|
1010 if (target == NULL) { |
|
1011 return NULL; // unformed MH |
|
1012 } |
|
1013 klassOop tklass = target->klass(); |
|
1014 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::Object_klass())) { |
|
1015 return target; // target is another MH (or something else?) |
|
1016 } |
|
1017 } |
|
1018 if (format == ETF_DIRECT_HANDLE) { |
|
1019 oop target = mh(); |
|
1020 for (;;) { |
|
1021 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { |
|
1022 return target; |
|
1023 } |
|
1024 if (!java_lang_invoke_MethodHandle::is_instance(target)){ |
|
1025 return NULL; // unformed MH |
|
1026 } |
|
1027 target = java_lang_invoke_MethodHandle::vmtarget(target); |
|
1028 } |
|
1029 } |
|
1030 // cases of metadata in MH.vmtarget: |
|
1031 // - AMH can have methodOop for static invoke with bound receiver |
|
1032 // - DMH can have methodOop for static invoke (on variable receiver) |
|
1033 // - DMH can have klassOop for dispatched (non-static) invoke |
|
1034 KlassHandle receiver_limit; int decode_flags = 0; |
|
1035 methodHandle m = decode_MethodHandle(mh(), receiver_limit, decode_flags); |
|
1036 if (m.is_null()) return NULL; |
|
1037 switch (format) { |
|
1038 case ETF_REFLECT_METHOD: |
|
1039 // same as jni_ToReflectedMethod: |
|
1040 if (m->is_initializer()) { |
|
1041 return Reflection::new_constructor(m, THREAD); |
|
1042 } else { |
|
1043 return Reflection::new_method(m, UseNewReflection, false, THREAD); |
|
1044 } |
|
1045 |
|
1046 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle |
|
1047 case ETF_METHOD_NAME: |
|
1048 { |
|
1049 if (SystemDictionary::MemberName_klass() == NULL) break; |
|
1050 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass()); |
|
1051 mname_klass->initialize(CHECK_NULL); |
|
1052 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL); // possible safepoint |
|
1053 java_lang_invoke_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED); |
|
1054 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); |
|
1055 init_MemberName(mname(), m(), do_dispatch); |
|
1056 expand_MemberName(mname, 0, CHECK_NULL); |
|
1057 return mname(); |
|
1058 } |
|
1059 } |
|
1060 |
|
1061 // Unknown format code. |
|
1062 char msg[50]; |
|
1063 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format); |
|
1064 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg); |
|
1065 } |
|
1066 |
|
1067 static const char* always_null_names[] = { |
|
1068 "java/lang/Void", |
|
1069 "java/lang/Null", |
|
1070 //"java/lang/Nothing", |
|
1071 "sun/dyn/empty/Empty", |
|
1072 "sun/invoke/empty/Empty", |
|
1073 NULL |
|
1074 }; |
|
1075 |
|
1076 static bool is_always_null_type(klassOop klass) { |
|
1077 if (klass == NULL) return false; // safety |
|
1078 if (!Klass::cast(klass)->oop_is_instance()) return false; |
|
1079 instanceKlass* ik = instanceKlass::cast(klass); |
|
1080 // Must be on the boot class path: |
|
1081 if (ik->class_loader() != NULL) return false; |
|
1082 // Check the name. |
|
1083 Symbol* name = ik->name(); |
|
1084 for (int i = 0; ; i++) { |
|
1085 const char* test_name = always_null_names[i]; |
|
1086 if (test_name == NULL) break; |
|
1087 if (name->equals(test_name)) |
|
1088 return true; |
|
1089 } |
|
1090 return false; |
|
1091 } |
|
1092 |
|
1093 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) { |
|
1094 if (dst == NULL) return true; |
|
1095 if (src == NULL) return (dst != SystemDictionary::Object_klass()); |
|
1096 if (src == dst || dst == SystemDictionary::Object_klass()) |
|
1097 return false; // quickest checks |
|
1098 Klass* srck = Klass::cast(src); |
|
1099 Klass* dstk = Klass::cast(dst); |
|
1100 if (dstk->is_interface()) { |
|
1101 // interface receivers can safely be viewed as untyped, |
|
1102 // because interface calls always include a dynamic check |
|
1103 //dstk = Klass::cast(SystemDictionary::Object_klass()); |
|
1104 return false; |
|
1105 } |
|
1106 if (srck->is_interface()) { |
|
1107 // interface arguments must be viewed as untyped |
|
1108 //srck = Klass::cast(SystemDictionary::Object_klass()); |
|
1109 return true; |
|
1110 } |
|
1111 if (is_always_null_type(src)) { |
|
1112 // some source types are known to be never instantiated; |
|
1113 // they represent references which are always null |
|
1114 // such null references never fail to convert safely |
|
1115 return false; |
|
1116 } |
|
1117 return !srck->is_subclass_of(dstk->as_klassOop()); |
|
1118 } |
|
1119 |
|
1120 static oop object_java_mirror() { |
|
1121 return Klass::cast(SystemDictionary::Object_klass())->java_mirror(); |
|
1122 } |
|
1123 |
|
1124 bool MethodHandles::is_float_fixed_reinterpretation_cast(BasicType src, BasicType dst) { |
|
1125 if (src == T_FLOAT) return dst == T_INT; |
|
1126 if (src == T_INT) return dst == T_FLOAT; |
|
1127 if (src == T_DOUBLE) return dst == T_LONG; |
|
1128 if (src == T_LONG) return dst == T_DOUBLE; |
|
1129 return false; |
|
1130 } |
|
1131 |
|
1132 bool MethodHandles::same_basic_type_for_arguments(BasicType src, |
|
1133 BasicType dst, |
|
1134 bool raw, |
|
1135 bool for_return) { |
|
1136 if (for_return) { |
|
1137 // return values can always be forgotten: |
|
1138 if (dst == T_VOID) return true; |
|
1139 if (src == T_VOID) return raw && (dst == T_INT); |
|
1140 // We allow caller to receive a garbage int, which is harmless. |
|
1141 // This trick is pulled by trusted code (see VerifyType.canPassRaw). |
|
1142 } |
|
1143 assert(src != T_VOID && dst != T_VOID, "should not be here"); |
|
1144 if (src == dst) return true; |
|
1145 if (type2size[src] != type2size[dst]) return false; |
|
1146 if (src == T_OBJECT || dst == T_OBJECT) return false; |
|
1147 if (raw) return true; // bitwise reinterpretation; caller guarantees safety |
|
1148 // allow reinterpretation casts for integral widening |
|
1149 if (is_subword_type(src)) { // subwords can fit in int or other subwords |
|
1150 if (dst == T_INT) // any subword fits in an int |
|
1151 return true; |
|
1152 if (src == T_BOOLEAN) // boolean fits in any subword |
|
1153 return is_subword_type(dst); |
|
1154 if (src == T_BYTE && dst == T_SHORT) |
|
1155 return true; // remaining case: byte fits in short |
|
1156 } |
|
1157 // allow float/fixed reinterpretation casts |
|
1158 if (is_float_fixed_reinterpretation_cast(src, dst)) |
|
1159 return true; |
|
1160 return false; |
|
1161 } |
|
1162 |
|
1163 const char* MethodHandles::check_method_receiver(methodOop m, |
|
1164 klassOop passed_recv_type) { |
|
1165 assert(!m->is_static(), "caller resp."); |
|
1166 if (passed_recv_type == NULL) |
|
1167 return "receiver type is primitive"; |
|
1168 if (class_cast_needed(passed_recv_type, m->method_holder())) { |
|
1169 Klass* formal = Klass::cast(m->method_holder()); |
|
1170 return SharedRuntime::generate_class_cast_message("receiver type", |
|
1171 formal->external_name()); |
|
1172 } |
|
1173 return NULL; // checks passed |
|
1174 } |
|
1175 |
|
1176 // Verify that m's signature can be called type-safely by a method handle |
|
1177 // of the given method type 'mtype'. |
|
1178 // It takes a TRAPS argument because it must perform symbol lookups. |
|
1179 void MethodHandles::verify_method_signature(methodHandle m, |
|
1180 Handle mtype, |
|
1181 int first_ptype_pos, |
|
1182 KlassHandle insert_ptype, |
|
1183 TRAPS) { |
|
1184 Handle mhi_type; |
|
1185 if (m->is_method_handle_invoke()) { |
|
1186 // use this more exact typing instead of the symbolic signature: |
|
1187 mhi_type = Handle(THREAD, m->method_handle_type()); |
|
1188 } |
|
1189 objArrayHandle ptypes(THREAD, java_lang_invoke_MethodType::ptypes(mtype())); |
|
1190 int pnum = first_ptype_pos; |
|
1191 int pmax = ptypes->length(); |
|
1192 int anum = 0; // method argument |
|
1193 const char* err = NULL; |
|
1194 ResourceMark rm(THREAD); |
|
1195 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) { |
|
1196 oop ptype_oop = NULL; |
|
1197 if (ss.at_return_type()) { |
|
1198 if (pnum != pmax) |
|
1199 { err = "too many arguments"; break; } |
|
1200 ptype_oop = java_lang_invoke_MethodType::rtype(mtype()); |
|
1201 } else { |
|
1202 if (pnum >= pmax) |
|
1203 { err = "not enough arguments"; break; } |
|
1204 if (pnum >= 0) |
|
1205 ptype_oop = ptypes->obj_at(pnum); |
|
1206 else if (insert_ptype.is_null()) |
|
1207 ptype_oop = NULL; |
|
1208 else |
|
1209 ptype_oop = insert_ptype->java_mirror(); |
|
1210 pnum += 1; |
|
1211 anum += 1; |
|
1212 } |
|
1213 KlassHandle pklass; |
|
1214 BasicType ptype = T_OBJECT; |
|
1215 bool have_ptype = false; |
|
1216 // missing ptype_oop does not match any non-reference; use Object to report the error |
|
1217 pklass = SystemDictionaryHandles::Object_klass(); |
|
1218 if (ptype_oop != NULL) { |
|
1219 have_ptype = true; |
|
1220 klassOop pklass_oop = NULL; |
|
1221 ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass_oop); |
|
1222 pklass = KlassHandle(THREAD, pklass_oop); |
|
1223 } |
|
1224 ptype_oop = NULL; //done with this |
|
1225 KlassHandle aklass; |
|
1226 BasicType atype = ss.type(); |
|
1227 if (atype == T_ARRAY) atype = T_OBJECT; // fold all refs to T_OBJECT |
|
1228 if (atype == T_OBJECT) { |
|
1229 if (!have_ptype) { |
|
1230 // null matches any reference |
|
1231 continue; |
|
1232 } |
|
1233 if (mhi_type.is_null()) { |
|
1234 // If we fail to resolve types at this point, we will usually throw an error. |
|
1235 TempNewSymbol name = ss.as_symbol_or_null(); |
|
1236 if (name != NULL) { |
|
1237 instanceKlass* mk = instanceKlass::cast(m->method_holder()); |
|
1238 Handle loader(THREAD, mk->class_loader()); |
|
1239 Handle domain(THREAD, mk->protection_domain()); |
|
1240 klassOop aklass_oop = SystemDictionary::resolve_or_null(name, loader, domain, CHECK); |
|
1241 if (aklass_oop != NULL) |
|
1242 aklass = KlassHandle(THREAD, aklass_oop); |
|
1243 if (aklass.is_null() && |
|
1244 pklass.not_null() && |
|
1245 loader.is_null() && |
|
1246 pklass->name() == name) |
|
1247 // accept name equivalence here, since that's the best we can do |
|
1248 aklass = pklass; |
|
1249 } |
|
1250 } else { |
|
1251 // for method handle invokers we don't look at the name in the signature |
|
1252 oop atype_oop; |
|
1253 if (ss.at_return_type()) |
|
1254 atype_oop = java_lang_invoke_MethodType::rtype(mhi_type()); |
|
1255 else |
|
1256 atype_oop = java_lang_invoke_MethodType::ptype(mhi_type(), anum-1); |
|
1257 klassOop aklass_oop = NULL; |
|
1258 atype = java_lang_Class::as_BasicType(atype_oop, &aklass_oop); |
|
1259 aklass = KlassHandle(THREAD, aklass_oop); |
|
1260 } |
|
1261 } |
|
1262 if (!ss.at_return_type()) { |
|
1263 err = check_argument_type_change(ptype, pklass(), atype, aklass(), anum); |
|
1264 } else { |
|
1265 err = check_return_type_change(atype, aklass(), ptype, pklass()); // note reversal! |
|
1266 } |
|
1267 if (err != NULL) break; |
|
1268 } |
|
1269 |
|
1270 if (err != NULL) { |
|
1271 #ifndef PRODUCT |
|
1272 if (PrintMiscellaneous && (Verbose || WizardMode)) { |
|
1273 tty->print("*** verify_method_signature failed: "); |
|
1274 java_lang_invoke_MethodType::print_signature(mtype(), tty); |
|
1275 tty->cr(); |
|
1276 tty->print_cr(" first_ptype_pos = %d, insert_ptype = "UINTX_FORMAT, first_ptype_pos, insert_ptype()); |
|
1277 tty->print(" Failing method: "); |
|
1278 m->print(); |
|
1279 } |
|
1280 #endif //PRODUCT |
|
1281 THROW_MSG(vmSymbols::java_lang_InternalError(), err); |
|
1282 } |
|
1283 } |
|
1284 |
|
1285 // Main routine for verifying the MethodHandle.type of a proposed |
|
1286 // direct or bound-direct method handle. |
|
1287 void MethodHandles::verify_method_type(methodHandle m, |
|
1288 Handle mtype, |
|
1289 bool has_bound_recv, |
|
1290 KlassHandle bound_recv_type, |
|
1291 TRAPS) { |
|
1292 bool m_needs_receiver = !m->is_static(); |
|
1293 |
|
1294 const char* err = NULL; |
|
1295 |
|
1296 int first_ptype_pos = m_needs_receiver ? 1 : 0; |
|
1297 if (has_bound_recv) { |
|
1298 first_ptype_pos -= 1; // ptypes do not include the bound argument; start earlier in them |
|
1299 if (m_needs_receiver && bound_recv_type.is_null()) |
|
1300 { err = "bound receiver is not an object"; goto die; } |
|
1301 } |
|
1302 |
|
1303 if (m_needs_receiver && err == NULL) { |
|
1304 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(mtype()); |
|
1305 if (ptypes->length() < first_ptype_pos) |
|
1306 { err = "receiver argument is missing"; goto die; } |
|
1307 if (has_bound_recv) |
|
1308 err = check_method_receiver(m(), bound_recv_type->as_klassOop()); |
|
1309 else |
|
1310 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(first_ptype_pos-1))); |
|
1311 if (err != NULL) goto die; |
|
1312 } |
|
1313 |
|
1314 // Check the other arguments for mistypes. |
|
1315 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK); |
|
1316 return; |
|
1317 |
|
1318 die: |
|
1319 THROW_MSG(vmSymbols::java_lang_InternalError(), err); |
|
1320 } |
|
1321 |
|
1322 void MethodHandles::verify_vmslots(Handle mh, TRAPS) { |
|
1323 // Verify vmslots. |
|
1324 int check_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(mh())); |
|
1325 if (java_lang_invoke_MethodHandle::vmslots(mh()) != check_slots) { |
|
1326 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH"); |
|
1327 } |
|
1328 } |
|
1329 |
|
1330 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) { |
|
1331 // Verify that argslot points at the given argnum. |
|
1332 int check_slot = argument_slot(java_lang_invoke_MethodHandle::type(mh()), argnum); |
|
1333 if (argslot != check_slot || argslot < 0) { |
|
1334 ResourceMark rm; |
|
1335 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d"; |
|
1336 size_t msglen = strlen(fmt) + 3*11 + 1; |
|
1337 char* msg = NEW_RESOURCE_ARRAY(char, msglen); |
|
1338 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot); |
|
1339 THROW_MSG(vmSymbols::java_lang_InternalError(), msg); |
|
1340 } |
|
1341 } |
|
1342 |
|
1343 // Verify the correspondence between two method types. |
|
1344 // Apart from the advertised changes, caller method type X must |
|
1345 // be able to invoke the callee method Y type with no violations |
|
1346 // of type integrity. |
|
1347 // Return NULL if all is well, else a short error message. |
|
1348 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end, |
|
1349 int insert_argnum, oop insert_type, |
|
1350 int change_argnum, oop change_type, |
|
1351 int delete_argnum, |
|
1352 oop dst_mtype, int dst_beg, int dst_end, |
|
1353 bool raw) { |
|
1354 objArrayOop src_ptypes = java_lang_invoke_MethodType::ptypes(src_mtype); |
|
1355 objArrayOop dst_ptypes = java_lang_invoke_MethodType::ptypes(dst_mtype); |
|
1356 |
|
1357 int src_max = src_ptypes->length(); |
|
1358 int dst_max = dst_ptypes->length(); |
|
1359 |
|
1360 if (src_end == -1) src_end = src_max; |
|
1361 if (dst_end == -1) dst_end = dst_max; |
|
1362 |
|
1363 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob"); |
|
1364 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob"); |
|
1365 |
|
1366 // pending actions; set to -1 when done: |
|
1367 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum; |
|
1368 |
|
1369 const char* err = NULL; |
|
1370 |
|
1371 // Walk along each array of parameter types, including a virtual |
|
1372 // NULL end marker at the end of each. |
|
1373 for (int src_idx = src_beg, dst_idx = dst_beg; |
|
1374 (src_idx <= src_end && dst_idx <= dst_end); |
|
1375 src_idx++, dst_idx++) { |
|
1376 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx); |
|
1377 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx); |
|
1378 bool fix_null_src_type = false; |
|
1379 |
|
1380 // Perform requested edits. |
|
1381 if (ins_idx == src_idx) { |
|
1382 // note that the inserted guy is never affected by a change or deletion |
|
1383 ins_idx = -1; |
|
1384 src_type = insert_type; |
|
1385 fix_null_src_type = true; |
|
1386 --src_idx; // back up to process src type on next loop |
|
1387 src_idx = src_end; |
|
1388 } else { |
|
1389 // note that the changed guy can be immediately deleted |
|
1390 if (chg_idx == src_idx) { |
|
1391 chg_idx = -1; |
|
1392 assert(src_idx < src_end, "oob"); |
|
1393 src_type = change_type; |
|
1394 fix_null_src_type = true; |
|
1395 } |
|
1396 if (del_idx == src_idx) { |
|
1397 del_idx = -1; |
|
1398 assert(src_idx < src_end, "oob"); |
|
1399 --dst_idx; |
|
1400 continue; // rerun loop after skipping this position |
|
1401 } |
|
1402 } |
|
1403 |
|
1404 if (src_type == NULL && fix_null_src_type) |
|
1405 // explicit null in this case matches any dest reference |
|
1406 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type); |
|
1407 |
|
1408 // Compare the two argument types. |
|
1409 if (src_type != dst_type) { |
|
1410 if (src_type == NULL) return "not enough arguments"; |
|
1411 if (dst_type == NULL) return "too many arguments"; |
|
1412 err = check_argument_type_change(src_type, dst_type, dst_idx, raw); |
|
1413 if (err != NULL) return err; |
|
1414 } |
|
1415 } |
|
1416 |
|
1417 // Now compare return types also. |
|
1418 oop src_rtype = java_lang_invoke_MethodType::rtype(src_mtype); |
|
1419 oop dst_rtype = java_lang_invoke_MethodType::rtype(dst_mtype); |
|
1420 if (src_rtype != dst_rtype) { |
|
1421 err = check_return_type_change(dst_rtype, src_rtype, raw); // note reversal! |
|
1422 if (err != NULL) return err; |
|
1423 } |
|
1424 |
|
1425 assert(err == NULL, ""); |
|
1426 return NULL; // all is well |
|
1427 } |
|
1428 |
|
1429 |
|
1430 const char* MethodHandles::check_argument_type_change(BasicType src_type, |
|
1431 klassOop src_klass, |
|
1432 BasicType dst_type, |
|
1433 klassOop dst_klass, |
|
1434 int argnum, |
|
1435 bool raw) { |
|
1436 const char* err = NULL; |
|
1437 const bool for_return = (argnum < 0); |
|
1438 |
|
1439 // just in case: |
|
1440 if (src_type == T_ARRAY) src_type = T_OBJECT; |
|
1441 if (dst_type == T_ARRAY) dst_type = T_OBJECT; |
|
1442 |
|
1443 // Produce some nice messages if VerifyMethodHandles is turned on: |
|
1444 if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) { |
|
1445 if (src_type == T_OBJECT) { |
|
1446 if (raw && is_java_primitive(dst_type)) |
|
1447 return NULL; // ref-to-prim discards ref and returns zero |
|
1448 err = (!for_return |
|
1449 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s" |
|
1450 : "type mismatch: returning a %s, but caller expects primitive %s"); |
|
1451 } else if (dst_type == T_OBJECT) { |
|
1452 err = (!for_return |
|
1453 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s" |
|
1454 : "type mismatch: returning a primitive %s, but caller expects %s"); |
|
1455 } else { |
|
1456 err = (!for_return |
|
1457 ? "type mismatch: passing a %s for method argument #%d, which expects %s" |
|
1458 : "type mismatch: returning a %s, but caller expects %s"); |
|
1459 } |
|
1460 } else if (src_type == T_OBJECT && dst_type == T_OBJECT && |
|
1461 class_cast_needed(src_klass, dst_klass)) { |
|
1462 if (!class_cast_needed(dst_klass, src_klass)) { |
|
1463 if (raw) |
|
1464 return NULL; // reverse cast is OK; the MH target is trusted to enforce it |
|
1465 err = (!for_return |
|
1466 ? "cast required: passing a %s for method argument #%d, which expects %s" |
|
1467 : "cast required: returning a %s, but caller expects %s"); |
|
1468 } else { |
|
1469 err = (!for_return |
|
1470 ? "reference mismatch: passing a %s for method argument #%d, which expects %s" |
|
1471 : "reference mismatch: returning a %s, but caller expects %s"); |
|
1472 } |
|
1473 } else { |
|
1474 // passed the obstacle course |
|
1475 return NULL; |
|
1476 } |
|
1477 |
|
1478 // format, format, format |
|
1479 const char* src_name = type2name(src_type); |
|
1480 const char* dst_name = type2name(dst_type); |
|
1481 if (src_name == NULL) src_name = "unknown type"; |
|
1482 if (dst_name == NULL) dst_name = "unknown type"; |
|
1483 if (src_type == T_OBJECT) |
|
1484 src_name = (src_klass != NULL) ? Klass::cast(src_klass)->external_name() : "an unresolved class"; |
|
1485 if (dst_type == T_OBJECT) |
|
1486 dst_name = (dst_klass != NULL) ? Klass::cast(dst_klass)->external_name() : "an unresolved class"; |
|
1487 |
|
1488 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11); |
|
1489 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1); |
|
1490 if (!for_return) { |
|
1491 assert(strstr(err, "%d") != NULL, ""); |
|
1492 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name); |
|
1493 } else { |
|
1494 assert(strstr(err, "%d") == NULL, ""); |
|
1495 jio_snprintf(msg, msglen, err, src_name, dst_name); |
|
1496 } |
|
1497 return msg; |
|
1498 } |
|
1499 |
|
1500 // Compute the depth within the stack of the given argument, i.e., |
|
1501 // the combined size of arguments to the right of the given argument. |
|
1502 // For the last argument (ptypes.length-1) this will be zero. |
|
1503 // For the first argument (0) this will be the size of all |
|
1504 // arguments but that one. For the special number -1, this |
|
1505 // will be the size of all arguments, including the first. |
|
1506 // If the argument is neither -1 nor a valid argument index, |
|
1507 // then return a negative number. Otherwise, the result |
|
1508 // is in the range [0..vmslots] inclusive. |
|
1509 int MethodHandles::argument_slot(oop method_type, int arg) { |
|
1510 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type); |
|
1511 int argslot = 0; |
|
1512 int len = ptypes->length(); |
|
1513 if (arg < -1 || arg >= len) return -99; |
|
1514 for (int i = len-1; i > arg; i--) { |
|
1515 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); |
|
1516 argslot += type2size[bt]; |
|
1517 } |
|
1518 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works"); |
|
1519 return argslot; |
|
1520 } |
|
1521 |
|
1522 // Given a slot number, return the argument number. |
|
1523 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) { |
|
1524 objArrayOop ptypes = java_lang_invoke_MethodType::ptypes(method_type); |
|
1525 int argslot = 0; |
|
1526 int len = ptypes->length(); |
|
1527 for (int i = len-1; i >= 0; i--) { |
|
1528 if (query_argslot == argslot) return i; |
|
1529 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); |
|
1530 argslot += type2size[bt]; |
|
1531 } |
|
1532 // return pseudo-arg deepest in stack: |
|
1533 if (query_argslot == argslot) return -1; |
|
1534 return -99; // oob slot, or splitting a double-slot arg |
|
1535 } |
|
1536 |
|
1537 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m, |
|
1538 KlassHandle receiver_limit, |
|
1539 int decode_flags, |
|
1540 KlassHandle receiver_klass, |
|
1541 TRAPS) { |
|
1542 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference"); |
|
1543 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument"); |
|
1544 |
|
1545 if (!m->is_static() && |
|
1546 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder()))) |
|
1547 // given type does not match class of method, or receiver is null! |
|
1548 // caller should have checked this, but let's be extra careful... |
|
1549 return methodHandle(); |
|
1550 |
|
1551 if (receiver_limit.not_null() && |
|
1552 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit()))) |
|
1553 // given type is not limited to the receiver type |
|
1554 // note that a null receiver can match any reference value, for a static method |
|
1555 return methodHandle(); |
|
1556 |
|
1557 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) { |
|
1558 // pre-dispatched or static method (null receiver is OK for static) |
|
1559 return m; |
|
1560 |
|
1561 } else if (receiver_klass.is_null()) { |
|
1562 // null receiver value; cannot dispatch |
|
1563 return methodHandle(); |
|
1564 |
|
1565 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) { |
|
1566 // perform virtual dispatch |
|
1567 int vtable_index = m->vtable_index(); |
|
1568 guarantee(vtable_index >= 0, "valid vtable index"); |
|
1569 |
|
1570 // receiver_klass might be an arrayKlassOop but all vtables start at |
|
1571 // the same place. The cast is to avoid virtual call and assertion. |
|
1572 // See also LinkResolver::runtime_resolve_virtual_method. |
|
1573 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass()); |
|
1574 DEBUG_ONLY(inst->verify_vtable_index(vtable_index)); |
|
1575 methodOop m_oop = inst->method_at_vtable(vtable_index); |
|
1576 return methodHandle(THREAD, m_oop); |
|
1577 |
|
1578 } else { |
|
1579 // perform interface dispatch |
|
1580 int itable_index = klassItable::compute_itable_index(m()); |
|
1581 guarantee(itable_index >= 0, "valid itable index"); |
|
1582 instanceKlass* inst = instanceKlass::cast(receiver_klass()); |
|
1583 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD); |
|
1584 return methodHandle(THREAD, m_oop); |
|
1585 } |
|
1586 } |
|
1587 |
|
1588 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) { |
|
1589 // Verify type. |
|
1590 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(mh())); |
|
1591 verify_method_type(m, mtype, false, KlassHandle(), CHECK); |
|
1592 |
|
1593 // Verify vmslots. |
|
1594 if (java_lang_invoke_MethodHandle::vmslots(mh()) != m->size_of_parameters()) { |
|
1595 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH"); |
|
1596 } |
|
1597 } |
|
1598 |
|
1599 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) { |
|
1600 // Check arguments. |
|
1601 if (mh.is_null() || m.is_null() || |
|
1602 (!do_dispatch && m->is_abstract())) { |
|
1603 THROW(vmSymbols::java_lang_InternalError()); |
|
1604 } |
|
1605 |
|
1606 if (VerifyMethodHandles) { |
|
1607 // The privileged code which invokes this routine should not make |
|
1608 // a mistake about types, but it's better to verify. |
|
1609 verify_DirectMethodHandle(mh, m, CHECK); |
|
1610 } |
|
1611 |
|
1612 // Finally, after safety checks are done, link to the target method. |
|
1613 // We will follow the same path as the latter part of |
|
1614 // InterpreterRuntime::resolve_invoke(), which first finds the method |
|
1615 // and then decides how to populate the constant pool cache entry |
|
1616 // that links the interpreter calls to the method. We need the same |
|
1617 // bits, and will use the same calling sequence code. |
|
1618 |
|
1619 int vmindex = methodOopDesc::garbage_vtable_index; |
|
1620 Handle vmtarget; |
|
1621 |
|
1622 instanceKlass::cast(m->method_holder())->link_class(CHECK); |
|
1623 |
|
1624 MethodHandleEntry* me = NULL; |
|
1625 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) { |
|
1626 // We are simulating an invokeinterface instruction. |
|
1627 // (We might also be simulating an invokevirtual on a miranda method, |
|
1628 // but it is safe to treat it as an invokeinterface.) |
|
1629 assert(!m->can_be_statically_bound(), "no final methods on interfaces"); |
|
1630 vmindex = klassItable::compute_itable_index(m()); |
|
1631 assert(vmindex >= 0, "(>=0) == do_dispatch"); |
|
1632 // Set up same bits as ConstantPoolCacheEntry::set_interface_call(). |
|
1633 vmtarget = m->method_holder(); // the interface |
|
1634 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh); |
|
1635 } else if (!do_dispatch || m->can_be_statically_bound()) { |
|
1636 // We are simulating an invokestatic or invokespecial instruction. |
|
1637 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method(). |
|
1638 vmtarget = m; |
|
1639 // this does not help dispatch, but it will make it possible to parse this MH: |
|
1640 vmindex = methodOopDesc::nonvirtual_vtable_index; |
|
1641 assert(vmindex < 0, "(>=0) == do_dispatch"); |
|
1642 if (!m->is_static()) { |
|
1643 me = MethodHandles::entry(MethodHandles::_invokespecial_mh); |
|
1644 } else { |
|
1645 me = MethodHandles::entry(MethodHandles::_invokestatic_mh); |
|
1646 // Part of the semantics of a static call is an initialization barrier. |
|
1647 // For a DMH, it is done now, when the handle is created. |
|
1648 Klass* k = Klass::cast(m->method_holder()); |
|
1649 if (k->should_be_initialized()) { |
|
1650 k->initialize(CHECK); // possible safepoint |
|
1651 } |
|
1652 } |
|
1653 } else { |
|
1654 // We are simulating an invokevirtual instruction. |
|
1655 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method(). |
|
1656 // The key logic is LinkResolver::runtime_resolve_virtual_method. |
|
1657 vmindex = m->vtable_index(); |
|
1658 vmtarget = m->method_holder(); |
|
1659 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh); |
|
1660 } |
|
1661 |
|
1662 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); } |
|
1663 |
|
1664 java_lang_invoke_DirectMethodHandle::set_vmtarget(mh(), vmtarget()); |
|
1665 java_lang_invoke_DirectMethodHandle::set_vmindex( mh(), vmindex); |
|
1666 DEBUG_ONLY(KlassHandle rlimit; int flags); |
|
1667 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m, |
|
1668 "properly stored for later decoding"); |
|
1669 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0)); |
|
1670 assert(!(actual_do_dispatch && !do_dispatch), |
|
1671 "do not perform dispatch if !do_dispatch specified"); |
|
1672 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch"); |
|
1673 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack"); |
|
1674 |
|
1675 // Done! |
|
1676 java_lang_invoke_MethodHandle::set_vmentry(mh(), me); |
|
1677 } |
|
1678 |
|
1679 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh, |
|
1680 methodHandle m, |
|
1681 TRAPS) { |
|
1682 // Verify type. |
|
1683 KlassHandle bound_recv_type; |
|
1684 { |
|
1685 oop receiver = java_lang_invoke_BoundMethodHandle::argument(mh()); |
|
1686 if (receiver != NULL) |
|
1687 bound_recv_type = KlassHandle(THREAD, receiver->klass()); |
|
1688 } |
|
1689 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(mh())); |
|
1690 verify_method_type(m, mtype, true, bound_recv_type, CHECK); |
|
1691 |
|
1692 int receiver_pos = m->size_of_parameters() - 1; |
|
1693 |
|
1694 // Verify MH.vmargslot, which should point at the bound receiver. |
|
1695 verify_vmargslot(mh, -1, java_lang_invoke_BoundMethodHandle::vmargslot(mh()), CHECK); |
|
1696 //verify_vmslots(mh, CHECK); |
|
1697 |
|
1698 // Verify vmslots. |
|
1699 if (java_lang_invoke_MethodHandle::vmslots(mh()) != receiver_pos) { |
|
1700 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)"); |
|
1701 } |
|
1702 } |
|
1703 |
|
1704 // Initialize a BMH with a receiver bound directly to a methodOop. |
|
1705 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh, |
|
1706 methodHandle original_m, |
|
1707 KlassHandle receiver_limit, |
|
1708 int decode_flags, |
|
1709 TRAPS) { |
|
1710 // Check arguments. |
|
1711 if (mh.is_null() || original_m.is_null()) { |
|
1712 THROW(vmSymbols::java_lang_InternalError()); |
|
1713 } |
|
1714 |
|
1715 KlassHandle receiver_klass; |
|
1716 { |
|
1717 oop receiver_oop = java_lang_invoke_BoundMethodHandle::argument(mh()); |
|
1718 if (receiver_oop != NULL) |
|
1719 receiver_klass = KlassHandle(THREAD, receiver_oop->klass()); |
|
1720 } |
|
1721 methodHandle m = dispatch_decoded_method(original_m, |
|
1722 receiver_limit, decode_flags, |
|
1723 receiver_klass, |
|
1724 CHECK); |
|
1725 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); } |
|
1726 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); } |
|
1727 |
|
1728 int vmargslot = m->size_of_parameters() - 1; |
|
1729 assert(java_lang_invoke_BoundMethodHandle::vmargslot(mh()) == vmargslot, ""); |
|
1730 |
|
1731 if (VerifyMethodHandles) { |
|
1732 verify_BoundMethodHandle_with_receiver(mh, m, CHECK); |
|
1733 } |
|
1734 |
|
1735 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m()); |
|
1736 |
|
1737 DEBUG_ONLY(KlassHandle junk1; int junk2); |
|
1738 assert(MethodHandles::decode_method(mh(), junk1, junk2) == m, "properly stored for later decoding"); |
|
1739 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot"); |
|
1740 |
|
1741 // Done! |
|
1742 java_lang_invoke_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh)); |
|
1743 } |
|
1744 |
|
1745 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum, |
|
1746 bool direct_to_method, TRAPS) { |
|
1747 ResourceMark rm; |
|
1748 Handle ptype_handle(THREAD, |
|
1749 java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum)); |
|
1750 KlassHandle ptype_klass; |
|
1751 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass); |
|
1752 int slots_pushed = type2size[ptype]; |
|
1753 |
|
1754 oop argument = java_lang_invoke_BoundMethodHandle::argument(mh()); |
|
1755 |
|
1756 const char* err = NULL; |
|
1757 |
|
1758 switch (ptype) { |
|
1759 case T_OBJECT: |
|
1760 if (argument != NULL) |
|
1761 // we must implicitly convert from the arg type to the outgoing ptype |
|
1762 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum); |
|
1763 break; |
|
1764 |
|
1765 case T_ARRAY: case T_VOID: |
|
1766 assert(false, "array, void do not appear here"); |
|
1767 default: |
|
1768 if (ptype != T_INT && !is_subword_type(ptype)) { |
|
1769 err = "unexpected parameter type"; |
|
1770 break; |
|
1771 } |
|
1772 // check subrange of Integer.value, if necessary |
|
1773 if (argument == NULL || argument->klass() != SystemDictionary::Integer_klass()) { |
|
1774 err = "bound integer argument must be of type java.lang.Integer"; |
|
1775 break; |
|
1776 } |
|
1777 if (ptype != T_INT) { |
|
1778 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT); |
|
1779 jint value = argument->int_field(value_offset); |
|
1780 int vminfo = adapter_unbox_subword_vminfo(ptype); |
|
1781 jint subword = truncate_subword_from_vminfo(value, vminfo); |
|
1782 if (value != subword) { |
|
1783 err = "bound subword value does not fit into the subword type"; |
|
1784 break; |
|
1785 } |
|
1786 } |
|
1787 break; |
|
1788 case T_FLOAT: |
|
1789 case T_DOUBLE: |
|
1790 case T_LONG: |
|
1791 { |
|
1792 // we must implicitly convert from the unboxed arg type to the outgoing ptype |
|
1793 BasicType argbox = java_lang_boxing_object::basic_type(argument); |
|
1794 if (argbox != ptype) { |
|
1795 err = check_argument_type_change(T_OBJECT, (argument == NULL |
|
1796 ? SystemDictionary::Object_klass() |
|
1797 : argument->klass()), |
|
1798 ptype, ptype_klass(), argnum); |
|
1799 assert(err != NULL, "this must be an error"); |
|
1800 } |
|
1801 break; |
|
1802 } |
|
1803 } |
|
1804 |
|
1805 if (err == NULL) { |
|
1806 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); |
|
1807 if (direct_to_method) { |
|
1808 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots"); |
|
1809 } else { |
|
1810 int target_pushes = decode_MethodHandle_stack_pushes(target()); |
|
1811 assert(this_pushes == slots_pushed + target_pushes, "BMH stack motion must be correct"); |
|
1812 } |
|
1813 } |
|
1814 |
|
1815 if (err == NULL) { |
|
1816 // Verify the rest of the method type. |
|
1817 err = check_method_type_insertion(java_lang_invoke_MethodHandle::type(mh()), |
|
1818 argnum, ptype_handle(), |
|
1819 java_lang_invoke_MethodHandle::type(target())); |
|
1820 } |
|
1821 |
|
1822 if (err != NULL) { |
|
1823 THROW_MSG(vmSymbols::java_lang_InternalError(), err); |
|
1824 } |
|
1825 } |
|
1826 |
|
1827 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { |
|
1828 // Check arguments. |
|
1829 if (mh.is_null() || target.is_null() || !java_lang_invoke_MethodHandle::is_instance(target())) { |
|
1830 THROW(vmSymbols::java_lang_InternalError()); |
|
1831 } |
|
1832 |
|
1833 int argslot = java_lang_invoke_BoundMethodHandle::vmargslot(mh()); |
|
1834 |
|
1835 if (VerifyMethodHandles) { |
|
1836 int insert_after = argnum - 1; |
|
1837 verify_vmargslot(mh, insert_after, argslot, CHECK); |
|
1838 verify_vmslots(mh, CHECK); |
|
1839 } |
|
1840 |
|
1841 // Get bound type and required slots. |
|
1842 BasicType ptype; |
|
1843 { |
|
1844 oop ptype_oop = java_lang_invoke_MethodType::ptype(java_lang_invoke_MethodHandle::type(target()), argnum); |
|
1845 ptype = java_lang_Class::as_BasicType(ptype_oop); |
|
1846 } |
|
1847 int slots_pushed = type2size[ptype]; |
|
1848 |
|
1849 // If (a) the target is a direct non-dispatched method handle, |
|
1850 // or (b) the target is a dispatched direct method handle and we |
|
1851 // are binding the receiver, cut out the middle-man. |
|
1852 // Do this by decoding the DMH and using its methodOop directly as vmtarget. |
|
1853 bool direct_to_method = false; |
|
1854 if (OptimizeMethodHandles && |
|
1855 target->klass() == SystemDictionary::DirectMethodHandle_klass() && |
|
1856 (argnum != 0 || java_lang_invoke_BoundMethodHandle::argument(mh()) != NULL) && |
|
1857 (argnum == 0 || java_lang_invoke_DirectMethodHandle::vmindex(target()) < 0)) { |
|
1858 KlassHandle receiver_limit; int decode_flags = 0; |
|
1859 methodHandle m = decode_method(target(), receiver_limit, decode_flags); |
|
1860 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); } |
|
1861 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - slots_pushed); // pos. of 1st arg. |
|
1862 assert(java_lang_invoke_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig"); |
|
1863 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) { |
|
1864 init_BoundMethodHandle_with_receiver(mh, m, |
|
1865 receiver_limit, decode_flags, |
|
1866 CHECK); |
|
1867 return; |
|
1868 } |
|
1869 |
|
1870 // Even if it is not a bound receiver, we still might be able |
|
1871 // to bind another argument and still invoke the methodOop directly. |
|
1872 if (!(decode_flags & _dmf_does_dispatch)) { |
|
1873 direct_to_method = true; |
|
1874 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), m()); |
|
1875 } |
|
1876 } |
|
1877 if (!direct_to_method) |
|
1878 java_lang_invoke_BoundMethodHandle::set_vmtarget(mh(), target()); |
|
1879 |
|
1880 if (VerifyMethodHandles) { |
|
1881 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK); |
|
1882 } |
|
1883 |
|
1884 // Next question: Is this a ref, int, or long bound value? |
|
1885 MethodHandleEntry* me = NULL; |
|
1886 if (ptype == T_OBJECT) { |
|
1887 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh); |
|
1888 else me = MethodHandles::entry(_bound_ref_mh); |
|
1889 } else if (slots_pushed == 2) { |
|
1890 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh); |
|
1891 else me = MethodHandles::entry(_bound_long_mh); |
|
1892 } else if (slots_pushed == 1) { |
|
1893 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh); |
|
1894 else me = MethodHandles::entry(_bound_int_mh); |
|
1895 } else { |
|
1896 assert(false, ""); |
|
1897 } |
|
1898 |
|
1899 // Done! |
|
1900 java_lang_invoke_MethodHandle::set_vmentry(mh(), me); |
|
1901 } |
|
1902 |
|
1903 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) { |
|
1904 char msg[200]; |
|
1905 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err); |
|
1906 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg); |
|
1907 } |
|
1908 |
|
1909 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) { |
|
1910 ResourceMark rm; |
|
1911 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh()); |
|
1912 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh()); |
|
1913 |
|
1914 verify_vmargslot(mh, argnum, argslot, CHECK); |
|
1915 verify_vmslots(mh, CHECK); |
|
1916 |
|
1917 jint conv_op = adapter_conversion_op(conversion); |
|
1918 if (!conv_op_valid(conv_op)) { |
|
1919 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD); |
|
1920 return; |
|
1921 } |
|
1922 EntryKind ek = adapter_entry_kind(conv_op); |
|
1923 |
|
1924 int stack_move = adapter_conversion_stack_move(conversion); |
|
1925 BasicType src = adapter_conversion_src_type(conversion); |
|
1926 BasicType dest = adapter_conversion_dest_type(conversion); |
|
1927 int vminfo = adapter_conversion_vminfo(conversion); // should be zero |
|
1928 |
|
1929 Handle argument(THREAD, java_lang_invoke_AdapterMethodHandle::argument(mh())); |
|
1930 Handle target(THREAD, java_lang_invoke_AdapterMethodHandle::vmtarget(mh())); |
|
1931 Handle src_mtype(THREAD, java_lang_invoke_MethodHandle::type(mh())); |
|
1932 Handle dst_mtype(THREAD, java_lang_invoke_MethodHandle::type(target())); |
|
1933 Handle arg_mtype; |
|
1934 |
|
1935 const char* err = NULL; |
|
1936 |
|
1937 if (err == NULL) { |
|
1938 // Check that the correct argument is supplied, but only if it is required. |
|
1939 switch (ek) { |
|
1940 case _adapter_check_cast: // target type of cast |
|
1941 case _adapter_ref_to_prim: // wrapper type from which to unbox |
|
1942 case _adapter_spread_args: // array type to spread from |
|
1943 if (!java_lang_Class::is_instance(argument()) |
|
1944 || java_lang_Class::is_primitive(argument())) |
|
1945 { err = "adapter requires argument of type java.lang.Class"; break; } |
|
1946 if (ek == _adapter_spread_args) { |
|
1947 // Make sure it is a suitable collection type. (Array, for now.) |
|
1948 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument())); |
|
1949 if (!ak->oop_is_array()) |
|
1950 { err = "spread adapter requires argument representing an array class"; break; } |
|
1951 BasicType et = arrayKlass::cast(ak->as_klassOop())->element_type(); |
|
1952 if (et != dest && stack_move <= 0) |
|
1953 { err = "spread adapter requires array class argument of correct type"; break; } |
|
1954 } |
|
1955 break; |
|
1956 case _adapter_prim_to_ref: // boxer MH to use |
|
1957 case _adapter_collect_args: // method handle which collects the args |
|
1958 case _adapter_fold_args: // method handle which collects the args |
|
1959 if (!java_lang_invoke_MethodHandle::is_instance(argument())) |
|
1960 { err = "MethodHandle adapter argument required"; break; } |
|
1961 arg_mtype = Handle(THREAD, java_lang_invoke_MethodHandle::type(argument())); |
|
1962 break; |
|
1963 default: |
|
1964 if (argument.not_null()) |
|
1965 { err = "adapter has spurious argument"; break; } |
|
1966 break; |
|
1967 } |
|
1968 } |
|
1969 |
|
1970 if (err == NULL) { |
|
1971 // Check that the src/dest types are supplied if needed. |
|
1972 // Also check relevant parameter or return types. |
|
1973 switch (ek) { |
|
1974 case _adapter_check_cast: |
|
1975 if (src != T_OBJECT || dest != T_OBJECT) { |
|
1976 err = "adapter requires object src/dest conversion subfields"; |
|
1977 } |
|
1978 break; |
|
1979 case _adapter_prim_to_prim: |
|
1980 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) { |
|
1981 err = "adapter requires primitive src/dest conversion subfields"; break; |
|
1982 } |
|
1983 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) || |
|
1984 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) { |
|
1985 err = "adapter cannot convert beween floating and fixed-point"; break; |
|
1986 } |
|
1987 break; |
|
1988 case _adapter_ref_to_prim: |
|
1989 if (src != T_OBJECT || !is_java_primitive(dest) |
|
1990 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) { |
|
1991 err = "adapter requires primitive dest conversion subfield"; break; |
|
1992 } |
|
1993 break; |
|
1994 case _adapter_prim_to_ref: |
|
1995 if (!is_java_primitive(src) || dest != T_OBJECT) { |
|
1996 err = "adapter requires primitive src conversion subfield"; break; |
|
1997 } |
|
1998 break; |
|
1999 case _adapter_swap_args: |
|
2000 { |
|
2001 if (!src || !dest) { |
|
2002 err = "adapter requires src/dest conversion subfields for swap"; break; |
|
2003 } |
|
2004 int src_size = type2size[src]; |
|
2005 if (src_size != type2size[dest]) { |
|
2006 err = "adapter requires equal sizes for src/dest"; break; |
|
2007 } |
|
2008 int src_slot = argslot; |
|
2009 int dest_slot = vminfo; |
|
2010 int src_arg = argnum; |
|
2011 int dest_arg = argument_slot_to_argnum(src_mtype(), dest_slot); |
|
2012 verify_vmargslot(mh, dest_arg, dest_slot, CHECK); |
|
2013 if (!(dest_slot >= src_slot + src_size) && |
|
2014 !(src_slot >= dest_slot + src_size)) { |
|
2015 err = "source, destination slots must be distinct"; break; |
|
2016 } else if (!(src_slot > dest_slot)) { |
|
2017 err = "source of swap must be deeper in stack"; break; |
|
2018 } |
|
2019 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), dest_arg), |
|
2020 java_lang_invoke_MethodType::ptype(dst_mtype(), src_arg), |
|
2021 dest_arg); |
|
2022 if (err == NULL) |
|
2023 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), src_arg), |
|
2024 java_lang_invoke_MethodType::ptype(dst_mtype(), dest_arg), |
|
2025 src_arg); |
|
2026 break; |
|
2027 } |
|
2028 case _adapter_rot_args: |
|
2029 { |
|
2030 if (!src || !dest) { |
|
2031 err = "adapter requires src/dest conversion subfields for rotate"; break; |
|
2032 } |
|
2033 int src_slot = argslot; |
|
2034 int limit_raw = vminfo; |
|
2035 bool rot_down = (src_slot < limit_raw); |
|
2036 int limit_bias = (rot_down ? MethodHandles::OP_ROT_ARGS_DOWN_LIMIT_BIAS : 0); |
|
2037 int limit_slot = limit_raw - limit_bias; |
|
2038 int src_arg = argnum; |
|
2039 int limit_arg = argument_slot_to_argnum(src_mtype(), limit_slot); |
|
2040 verify_vmargslot(mh, limit_arg, limit_slot, CHECK); |
|
2041 if (src_slot == limit_slot) { |
|
2042 err = "source, destination slots must be distinct"; break; |
|
2043 } |
|
2044 if (!rot_down) { // rotate slots up == shift arguments left |
|
2045 // limit_slot is an inclusive lower limit |
|
2046 assert((src_slot > limit_slot) && (src_arg < limit_arg), ""); |
|
2047 // rotate up: [limit_slot..src_slot-ss] --> [limit_slot+ss..src_slot] |
|
2048 // that is: [src_arg+1..limit_arg] --> [src_arg..limit_arg-1] |
|
2049 for (int i = src_arg+1; i <= limit_arg && err == NULL; i++) { |
|
2050 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), i), |
|
2051 java_lang_invoke_MethodType::ptype(dst_mtype(), i-1), |
|
2052 i); |
|
2053 } |
|
2054 } else { // rotate slots down == shfit arguments right |
|
2055 // limit_slot is an exclusive upper limit |
|
2056 assert((src_slot < limit_slot - limit_bias) && (src_arg > limit_arg + limit_bias), ""); |
|
2057 // rotate down: [src_slot+ss..limit_slot) --> [src_slot..limit_slot-ss) |
|
2058 // that is: (limit_arg..src_arg-1] --> (dst_arg+1..src_arg] |
|
2059 for (int i = limit_arg+1; i <= src_arg-1 && err == NULL; i++) { |
|
2060 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), i), |
|
2061 java_lang_invoke_MethodType::ptype(dst_mtype(), i+1), |
|
2062 i); |
|
2063 } |
|
2064 } |
|
2065 if (err == NULL) { |
|
2066 int dest_arg = (rot_down ? limit_arg+1 : limit_arg); |
|
2067 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), src_arg), |
|
2068 java_lang_invoke_MethodType::ptype(dst_mtype(), dest_arg), |
|
2069 src_arg); |
|
2070 } |
|
2071 } |
|
2072 break; |
|
2073 case _adapter_spread_args: |
|
2074 case _adapter_collect_args: |
|
2075 case _adapter_fold_args: |
|
2076 { |
|
2077 bool is_spread = (ek == _adapter_spread_args); |
|
2078 bool is_fold = (ek == _adapter_fold_args); |
|
2079 BasicType coll_type = is_spread ? src : dest; |
|
2080 BasicType elem_type = is_spread ? dest : src; |
|
2081 // coll_type is type of args in collected form (or T_VOID if none) |
|
2082 // elem_type is common type of args in spread form (or T_VOID if missing or heterogeneous) |
|
2083 if (coll_type == 0 || elem_type == 0) { |
|
2084 err = "adapter requires src/dest subfields for spread or collect"; break; |
|
2085 } |
|
2086 if (is_spread && coll_type != T_OBJECT) { |
|
2087 err = "spread adapter requires object type for argument bundle"; break; |
|
2088 } |
|
2089 Handle spread_mtype = (is_spread ? dst_mtype : src_mtype); |
|
2090 int spread_slot = argslot; |
|
2091 int spread_arg = argnum; |
|
2092 int slots_pushed = stack_move / stack_move_unit(); |
|
2093 int coll_slot_count = type2size[coll_type]; |
|
2094 int spread_slot_count = (is_spread ? slots_pushed : -slots_pushed) + coll_slot_count; |
|
2095 if (is_fold) spread_slot_count = argument_slot_count(arg_mtype()); |
|
2096 if (!is_spread) { |
|
2097 int init_slots = argument_slot_count(src_mtype()); |
|
2098 int coll_slots = argument_slot_count(arg_mtype()); |
|
2099 if (spread_slot_count > init_slots || |
|
2100 spread_slot_count != coll_slots) { |
|
2101 err = "collect adapter has inconsistent arg counts"; break; |
|
2102 } |
|
2103 int next_slots = argument_slot_count(dst_mtype()); |
|
2104 int unchanged_slots_in = (init_slots - spread_slot_count); |
|
2105 int unchanged_slots_out = (next_slots - coll_slot_count - (is_fold ? spread_slot_count : 0)); |
|
2106 if (unchanged_slots_in != unchanged_slots_out) { |
|
2107 err = "collect adapter continuation has inconsistent arg counts"; break; |
|
2108 } |
|
2109 } |
|
2110 } |
|
2111 break; |
|
2112 default: |
|
2113 if (src != 0 || dest != 0) { |
|
2114 err = "adapter has spurious src/dest conversion subfields"; break; |
|
2115 } |
|
2116 break; |
|
2117 } |
|
2118 } |
|
2119 |
|
2120 if (err == NULL) { |
|
2121 // Check the stack_move subfield. |
|
2122 // It must always report the net change in stack size, positive or negative. |
|
2123 int slots_pushed = stack_move / stack_move_unit(); |
|
2124 switch (ek) { |
|
2125 case _adapter_prim_to_prim: |
|
2126 case _adapter_ref_to_prim: |
|
2127 case _adapter_prim_to_ref: |
|
2128 if (slots_pushed != type2size[dest] - type2size[src]) { |
|
2129 err = "wrong stack motion for primitive conversion"; |
|
2130 } |
|
2131 break; |
|
2132 case _adapter_dup_args: |
|
2133 if (slots_pushed <= 0) { |
|
2134 err = "adapter requires conversion subfield slots_pushed > 0"; |
|
2135 } |
|
2136 break; |
|
2137 case _adapter_drop_args: |
|
2138 if (slots_pushed >= 0) { |
|
2139 err = "adapter requires conversion subfield slots_pushed < 0"; |
|
2140 } |
|
2141 break; |
|
2142 case _adapter_collect_args: |
|
2143 case _adapter_fold_args: |
|
2144 if (slots_pushed > 2) { |
|
2145 err = "adapter requires conversion subfield slots_pushed <= 2"; |
|
2146 } |
|
2147 break; |
|
2148 case _adapter_spread_args: |
|
2149 if (slots_pushed < -1) { |
|
2150 err = "adapter requires conversion subfield slots_pushed >= -1"; |
|
2151 } |
|
2152 break; |
|
2153 default: |
|
2154 if (stack_move != 0) { |
|
2155 err = "adapter has spurious stack_move conversion subfield"; |
|
2156 } |
|
2157 break; |
|
2158 } |
|
2159 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) { |
|
2160 err = "stack_move conversion subfield must be multiple of stack_move_unit"; |
|
2161 } |
|
2162 } |
|
2163 |
|
2164 if (err == NULL) { |
|
2165 // Make sure this adapter's stack pushing is accurately recorded. |
|
2166 int slots_pushed = stack_move / stack_move_unit(); |
|
2167 int this_vmslots = java_lang_invoke_MethodHandle::vmslots(mh()); |
|
2168 int target_vmslots = java_lang_invoke_MethodHandle::vmslots(target()); |
|
2169 int target_pushes = decode_MethodHandle_stack_pushes(target()); |
|
2170 if (slots_pushed != (target_vmslots - this_vmslots)) { |
|
2171 err = "stack_move inconsistent with previous and current MethodType vmslots"; |
|
2172 } else { |
|
2173 int this_pushes = decode_MethodHandle_stack_pushes(mh()); |
|
2174 if (slots_pushed + target_pushes != this_pushes) { |
|
2175 if (this_pushes == 0) |
|
2176 err = "adapter push count not initialized"; |
|
2177 else |
|
2178 err = "adapter push count is wrong"; |
|
2179 } |
|
2180 } |
|
2181 |
|
2182 // While we're at it, check that the stack motion decoder works: |
|
2183 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); |
|
2184 assert(this_pushes == slots_pushed + target_pushes, "AMH stack motion must be correct"); |
|
2185 } |
|
2186 |
|
2187 if (err == NULL && vminfo != 0) { |
|
2188 switch (ek) { |
|
2189 case _adapter_swap_args: |
|
2190 case _adapter_rot_args: |
|
2191 case _adapter_prim_to_ref: |
|
2192 case _adapter_collect_args: |
|
2193 case _adapter_fold_args: |
|
2194 break; // OK |
|
2195 default: |
|
2196 err = "vminfo subfield is reserved to the JVM"; |
|
2197 } |
|
2198 } |
|
2199 |
|
2200 // Do additional ad hoc checks. |
|
2201 if (err == NULL) { |
|
2202 switch (ek) { |
|
2203 case _adapter_retype_only: |
|
2204 err = check_method_type_passthrough(src_mtype(), dst_mtype(), false); |
|
2205 break; |
|
2206 |
|
2207 case _adapter_retype_raw: |
|
2208 err = check_method_type_passthrough(src_mtype(), dst_mtype(), true); |
|
2209 break; |
|
2210 |
|
2211 case _adapter_check_cast: |
|
2212 { |
|
2213 // The actual value being checked must be a reference: |
|
2214 err = check_argument_type_change(java_lang_invoke_MethodType::ptype(src_mtype(), argnum), |
|
2215 object_java_mirror(), argnum); |
|
2216 if (err != NULL) break; |
|
2217 |
|
2218 // The output of the cast must fit with the destination argument: |
|
2219 Handle cast_class = argument; |
|
2220 err = check_method_type_conversion(src_mtype(), |
|
2221 argnum, cast_class(), |
|
2222 dst_mtype()); |
|
2223 } |
|
2224 break; |
|
2225 |
|
2226 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles |
|
2227 } |
|
2228 } |
|
2229 |
|
2230 if (err != NULL) { |
|
2231 throw_InternalError_for_bad_conversion(conversion, err, THREAD); |
|
2232 return; |
|
2233 } |
|
2234 |
|
2235 } |
|
2236 |
|
2237 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { |
|
2238 Handle argument = java_lang_invoke_AdapterMethodHandle::argument(mh()); |
|
2239 int argslot = java_lang_invoke_AdapterMethodHandle::vmargslot(mh()); |
|
2240 jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh()); |
|
2241 jint conv_op = adapter_conversion_op(conversion); |
|
2242 |
|
2243 // adjust the adapter code to the internal EntryKind enumeration: |
|
2244 EntryKind ek_orig = adapter_entry_kind(conv_op); |
|
2245 EntryKind ek_opt = ek_orig; // may be optimized |
|
2246 EntryKind ek_try; // temp |
|
2247 |
|
2248 // Finalize the vmtarget field (Java initialized it to null). |
|
2249 if (!java_lang_invoke_MethodHandle::is_instance(target())) { |
|
2250 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD); |
|
2251 return; |
|
2252 } |
|
2253 java_lang_invoke_AdapterMethodHandle::set_vmtarget(mh(), target()); |
|
2254 |
|
2255 int stack_move = adapter_conversion_stack_move(conversion); |
|
2256 BasicType src = adapter_conversion_src_type(conversion); |
|
2257 BasicType dest = adapter_conversion_dest_type(conversion); |
|
2258 int vminfo = adapter_conversion_vminfo(conversion); // should be zero |
|
2259 |
|
2260 int slots_pushed = stack_move / stack_move_unit(); |
|
2261 |
|
2262 if (VerifyMethodHandles) { |
|
2263 verify_AdapterMethodHandle(mh, argnum, CHECK); |
|
2264 } |
|
2265 |
|
2266 const char* err = NULL; |
|
2267 |
|
2268 if (!conv_op_supported(conv_op)) { |
|
2269 err = "adapter not yet implemented in the JVM"; |
|
2270 } |
|
2271 |
|
2272 // Now it's time to finish the case analysis and pick a MethodHandleEntry. |
|
2273 switch (ek_orig) { |
|
2274 case _adapter_retype_only: |
|
2275 case _adapter_retype_raw: |
|
2276 case _adapter_check_cast: |
|
2277 case _adapter_dup_args: |
|
2278 case _adapter_drop_args: |
|
2279 // these work fine via general case code |
|
2280 break; |
|
2281 |
|
2282 case _adapter_prim_to_prim: |
|
2283 { |
|
2284 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}. |
|
2285 // And, the {float,double} -> {int,long} cases must be handled by Java. |
|
2286 switch (type2size[src] *4+ type2size[dest]) { |
|
2287 case 1 *4+ 1: |
|
2288 assert(src == T_INT || is_subword_type(src), "source is not float"); |
|
2289 // Subword-related cases are int -> {boolean,byte,char,short}. |
|
2290 ek_opt = _adapter_opt_i2i; |
|
2291 vminfo = adapter_prim_to_prim_subword_vminfo(dest); |
|
2292 break; |
|
2293 case 2 *4+ 1: |
|
2294 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) { |
|
2295 ek_opt = _adapter_opt_l2i; |
|
2296 vminfo = adapter_prim_to_prim_subword_vminfo(dest); |
|
2297 } else if (src == T_DOUBLE && dest == T_FLOAT) { |
|
2298 ek_opt = _adapter_opt_d2f; |
|
2299 } else { |
|
2300 goto throw_not_impl; // runs user code, hence could block |
|
2301 } |
|
2302 break; |
|
2303 case 1 *4+ 2: |
|
2304 if ((src == T_INT || is_subword_type(src)) && dest == T_LONG) { |
|
2305 ek_opt = _adapter_opt_i2l; |
|
2306 } else if (src == T_FLOAT && dest == T_DOUBLE) { |
|
2307 ek_opt = _adapter_opt_f2d; |
|
2308 } else { |
|
2309 goto throw_not_impl; // runs user code, hence could block |
|
2310 } |
|
2311 break; |
|
2312 default: |
|
2313 goto throw_not_impl; // runs user code, hence could block |
|
2314 break; |
|
2315 } |
|
2316 } |
|
2317 break; |
|
2318 |
|
2319 case _adapter_ref_to_prim: |
|
2320 { |
|
2321 switch (type2size[dest]) { |
|
2322 case 1: |
|
2323 ek_opt = _adapter_opt_unboxi; |
|
2324 vminfo = adapter_unbox_subword_vminfo(dest); |
|
2325 break; |
|
2326 case 2: |
|
2327 ek_opt = _adapter_opt_unboxl; |
|
2328 break; |
|
2329 default: |
|
2330 goto throw_not_impl; |
|
2331 break; |
|
2332 } |
|
2333 } |
|
2334 break; |
|
2335 |
|
2336 case _adapter_prim_to_ref: |
|
2337 { |
|
2338 // vminfo will be the location to insert the return value |
|
2339 vminfo = argslot; |
|
2340 ek_opt = _adapter_opt_collect_ref; |
|
2341 ensure_vmlayout_field(target, CHECK); |
|
2342 // for MethodHandleWalk: |
|
2343 if (java_lang_invoke_AdapterMethodHandle::is_instance(argument())) |
|
2344 ensure_vmlayout_field(argument, CHECK); |
|
2345 if (!OptimizeMethodHandles) break; |
|
2346 switch (type2size[src]) { |
|
2347 case 1: |
|
2348 ek_try = EntryKind(_adapter_opt_filter_S0_ref + argslot); |
|
2349 if (ek_try < _adapter_opt_collect_LAST && |
|
2350 ek_adapter_opt_collect_slot(ek_try) == argslot) { |
|
2351 assert(ek_adapter_opt_collect_count(ek_try) == 1 && |
|
2352 ek_adapter_opt_collect_type(ek_try) == T_OBJECT, ""); |
|
2353 ek_opt = ek_try; |
|
2354 break; |
|
2355 } |
|
2356 // else downgrade to variable slot: |
|
2357 ek_opt = _adapter_opt_collect_1_ref; |
|
2358 break; |
|
2359 case 2: |
|
2360 ek_try = EntryKind(_adapter_opt_collect_2_S0_ref + argslot); |
|
2361 if (ek_try < _adapter_opt_collect_LAST && |
|
2362 ek_adapter_opt_collect_slot(ek_try) == argslot) { |
|
2363 assert(ek_adapter_opt_collect_count(ek_try) == 2 && |
|
2364 ek_adapter_opt_collect_type(ek_try) == T_OBJECT, ""); |
|
2365 ek_opt = ek_try; |
|
2366 break; |
|
2367 } |
|
2368 // else downgrade to variable slot: |
|
2369 ek_opt = _adapter_opt_collect_2_ref; |
|
2370 break; |
|
2371 default: |
|
2372 goto throw_not_impl; |
|
2373 break; |
|
2374 } |
|
2375 } |
|
2376 break; |
|
2377 |
|
2378 case _adapter_swap_args: |
|
2379 case _adapter_rot_args: |
|
2380 { |
|
2381 int swap_slots = type2size[src]; |
|
2382 int src_slot = argslot; |
|
2383 int dest_slot = vminfo; |
|
2384 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1; |
|
2385 switch (swap_slots) { |
|
2386 case 1: |
|
2387 ek_opt = (!rotate ? _adapter_opt_swap_1 : |
|
2388 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down); |
|
2389 break; |
|
2390 case 2: |
|
2391 ek_opt = (!rotate ? _adapter_opt_swap_2 : |
|
2392 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down); |
|
2393 break; |
|
2394 default: |
|
2395 goto throw_not_impl; |
|
2396 break; |
|
2397 } |
|
2398 } |
|
2399 break; |
|
2400 |
|
2401 case _adapter_spread_args: |
|
2402 { |
|
2403 // vminfo will be the required length of the array |
|
2404 int array_size = (slots_pushed + 1) / (type2size[dest] == 2 ? 2 : 1); |
|
2405 vminfo = array_size; |
|
2406 // general case |
|
2407 switch (dest) { |
|
2408 case T_BOOLEAN : // fall through to T_BYTE: |
|
2409 case T_BYTE : ek_opt = _adapter_opt_spread_byte; break; |
|
2410 case T_CHAR : ek_opt = _adapter_opt_spread_char; break; |
|
2411 case T_SHORT : ek_opt = _adapter_opt_spread_short; break; |
|
2412 case T_INT : ek_opt = _adapter_opt_spread_int; break; |
|
2413 case T_LONG : ek_opt = _adapter_opt_spread_long; break; |
|
2414 case T_FLOAT : ek_opt = _adapter_opt_spread_float; break; |
|
2415 case T_DOUBLE : ek_opt = _adapter_opt_spread_double; break; |
|
2416 case T_OBJECT : ek_opt = _adapter_opt_spread_ref; break; |
|
2417 case T_VOID : if (array_size != 0) goto throw_not_impl; |
|
2418 ek_opt = _adapter_opt_spread_ref; break; |
|
2419 default : goto throw_not_impl; |
|
2420 } |
|
2421 assert(array_size == 0 || // it doesn't matter what the spreader is |
|
2422 (ek_adapter_opt_spread_count(ek_opt) == -1 && |
|
2423 (ek_adapter_opt_spread_type(ek_opt) == dest || |
|
2424 (ek_adapter_opt_spread_type(ek_opt) == T_BYTE && dest == T_BOOLEAN))), |
|
2425 err_msg("dest=%d ek_opt=%d", dest, ek_opt)); |
|
2426 |
|
2427 if (array_size <= 0) { |
|
2428 // since the general case does not handle length 0, this case is required: |
|
2429 ek_opt = _adapter_opt_spread_0; |
|
2430 break; |
|
2431 } |
|
2432 if (dest == T_OBJECT) { |
|
2433 ek_try = EntryKind(_adapter_opt_spread_1_ref - 1 + array_size); |
|
2434 if (ek_try < _adapter_opt_spread_LAST && |
|
2435 ek_adapter_opt_spread_count(ek_try) == array_size) { |
|
2436 assert(ek_adapter_opt_spread_type(ek_try) == dest, ""); |
|
2437 ek_opt = ek_try; |
|
2438 break; |
|
2439 } |
|
2440 } |
|
2441 break; |
|
2442 } |
|
2443 break; |
|
2444 |
|
2445 case _adapter_collect_args: |
|
2446 { |
|
2447 int elem_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(argument())); |
|
2448 // vminfo will be the location to insert the return value |
|
2449 vminfo = argslot; |
|
2450 ensure_vmlayout_field(target, CHECK); |
|
2451 ensure_vmlayout_field(argument, CHECK); |
|
2452 |
|
2453 // general case: |
|
2454 switch (dest) { |
|
2455 default : if (!is_subword_type(dest)) goto throw_not_impl; |
|
2456 // else fall through: |
|
2457 case T_INT : ek_opt = _adapter_opt_collect_int; break; |
|
2458 case T_LONG : ek_opt = _adapter_opt_collect_long; break; |
|
2459 case T_FLOAT : ek_opt = _adapter_opt_collect_float; break; |
|
2460 case T_DOUBLE : ek_opt = _adapter_opt_collect_double; break; |
|
2461 case T_OBJECT : ek_opt = _adapter_opt_collect_ref; break; |
|
2462 case T_VOID : ek_opt = _adapter_opt_collect_void; break; |
|
2463 } |
|
2464 assert(ek_adapter_opt_collect_slot(ek_opt) == -1 && |
|
2465 ek_adapter_opt_collect_count(ek_opt) == -1 && |
|
2466 (ek_adapter_opt_collect_type(ek_opt) == dest || |
|
2467 ek_adapter_opt_collect_type(ek_opt) == T_INT && is_subword_type(dest)), |
|
2468 ""); |
|
2469 |
|
2470 if (dest == T_OBJECT && elem_slots == 1 && OptimizeMethodHandles) { |
|
2471 // filter operation on a ref |
|
2472 ek_try = EntryKind(_adapter_opt_filter_S0_ref + argslot); |
|
2473 if (ek_try < _adapter_opt_collect_LAST && |
|
2474 ek_adapter_opt_collect_slot(ek_try) == argslot) { |
|
2475 assert(ek_adapter_opt_collect_count(ek_try) == elem_slots && |
|
2476 ek_adapter_opt_collect_type(ek_try) == dest, ""); |
|
2477 ek_opt = ek_try; |
|
2478 break; |
|
2479 } |
|
2480 ek_opt = _adapter_opt_collect_1_ref; |
|
2481 break; |
|
2482 } |
|
2483 |
|
2484 if (dest == T_OBJECT && elem_slots == 2 && OptimizeMethodHandles) { |
|
2485 // filter of two arguments |
|
2486 ek_try = EntryKind(_adapter_opt_collect_2_S0_ref + argslot); |
|
2487 if (ek_try < _adapter_opt_collect_LAST && |
|
2488 ek_adapter_opt_collect_slot(ek_try) == argslot) { |
|
2489 assert(ek_adapter_opt_collect_count(ek_try) == elem_slots && |
|
2490 ek_adapter_opt_collect_type(ek_try) == dest, ""); |
|
2491 ek_opt = ek_try; |
|
2492 break; |
|
2493 } |
|
2494 ek_opt = _adapter_opt_collect_2_ref; |
|
2495 break; |
|
2496 } |
|
2497 |
|
2498 if (dest == T_OBJECT && OptimizeMethodHandles) { |
|
2499 // try to use a fixed length adapter |
|
2500 ek_try = EntryKind(_adapter_opt_collect_0_ref + elem_slots); |
|
2501 if (ek_try < _adapter_opt_collect_LAST && |
|
2502 ek_adapter_opt_collect_count(ek_try) == elem_slots) { |
|
2503 assert(ek_adapter_opt_collect_slot(ek_try) == -1 && |
|
2504 ek_adapter_opt_collect_type(ek_try) == dest, ""); |
|
2505 ek_opt = ek_try; |
|
2506 break; |
|
2507 } |
|
2508 } |
|
2509 |
|
2510 break; |
|
2511 } |
|
2512 |
|
2513 case _adapter_fold_args: |
|
2514 { |
|
2515 int elem_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(argument())); |
|
2516 // vminfo will be the location to insert the return value |
|
2517 vminfo = argslot + elem_slots; |
|
2518 ensure_vmlayout_field(target, CHECK); |
|
2519 ensure_vmlayout_field(argument, CHECK); |
|
2520 |
|
2521 switch (dest) { |
|
2522 default : if (!is_subword_type(dest)) goto throw_not_impl; |
|
2523 // else fall through: |
|
2524 case T_INT : ek_opt = _adapter_opt_fold_int; break; |
|
2525 case T_LONG : ek_opt = _adapter_opt_fold_long; break; |
|
2526 case T_FLOAT : ek_opt = _adapter_opt_fold_float; break; |
|
2527 case T_DOUBLE : ek_opt = _adapter_opt_fold_double; break; |
|
2528 case T_OBJECT : ek_opt = _adapter_opt_fold_ref; break; |
|
2529 case T_VOID : ek_opt = _adapter_opt_fold_void; break; |
|
2530 } |
|
2531 assert(ek_adapter_opt_collect_slot(ek_opt) == -1 && |
|
2532 ek_adapter_opt_collect_count(ek_opt) == -1 && |
|
2533 (ek_adapter_opt_collect_type(ek_opt) == dest || |
|
2534 ek_adapter_opt_collect_type(ek_opt) == T_INT && is_subword_type(dest)), |
|
2535 ""); |
|
2536 |
|
2537 if (dest == T_OBJECT && elem_slots == 0 && OptimizeMethodHandles) { |
|
2538 // if there are no args, just pretend it's a collect |
|
2539 ek_opt = _adapter_opt_collect_0_ref; |
|
2540 break; |
|
2541 } |
|
2542 |
|
2543 if (dest == T_OBJECT && OptimizeMethodHandles) { |
|
2544 // try to use a fixed length adapter |
|
2545 ek_try = EntryKind(_adapter_opt_fold_1_ref - 1 + elem_slots); |
|
2546 if (ek_try < _adapter_opt_fold_LAST && |
|
2547 ek_adapter_opt_collect_count(ek_try) == elem_slots) { |
|
2548 assert(ek_adapter_opt_collect_slot(ek_try) == -1 && |
|
2549 ek_adapter_opt_collect_type(ek_try) == dest, ""); |
|
2550 ek_opt = ek_try; |
|
2551 break; |
|
2552 } |
|
2553 } |
|
2554 |
|
2555 break; |
|
2556 } |
|
2557 |
|
2558 default: |
|
2559 // should have failed much earlier; must be a missing case here |
|
2560 assert(false, "incomplete switch"); |
|
2561 // and fall through: |
|
2562 |
|
2563 throw_not_impl: |
|
2564 if (err == NULL) |
|
2565 err = "unknown adapter type"; |
|
2566 break; |
|
2567 } |
|
2568 |
|
2569 if (err == NULL && (vminfo & CONV_VMINFO_MASK) != vminfo) { |
|
2570 // should not happen, since vminfo is used to encode arg/slot indexes < 255 |
|
2571 err = "vminfo overflow"; |
|
2572 } |
|
2573 |
|
2574 if (err == NULL && !have_entry(ek_opt)) { |
|
2575 err = "adapter stub for this kind of method handle is missing"; |
|
2576 } |
|
2577 |
|
2578 if (err == NULL && ek_opt == ek_orig) { |
|
2579 switch (ek_opt) { |
|
2580 case _adapter_prim_to_prim: |
|
2581 case _adapter_ref_to_prim: |
|
2582 case _adapter_prim_to_ref: |
|
2583 case _adapter_swap_args: |
|
2584 case _adapter_rot_args: |
|
2585 case _adapter_collect_args: |
|
2586 case _adapter_fold_args: |
|
2587 case _adapter_spread_args: |
|
2588 // should be handled completely by optimized cases; see above |
|
2589 err = "init_AdapterMethodHandle should not issue this"; |
|
2590 break; |
|
2591 } |
|
2592 } |
|
2593 |
|
2594 if (err != NULL) { |
|
2595 throw_InternalError_for_bad_conversion(conversion, err_msg("%s: conv_op %d ek_opt %d", err, conv_op, ek_opt), THREAD); |
|
2596 return; |
|
2597 } |
|
2598 |
|
2599 // Rebuild the conversion value; maybe parts of it were changed. |
|
2600 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo); |
|
2601 |
|
2602 // Finalize the conversion field. (Note that it is final to Java code.) |
|
2603 java_lang_invoke_AdapterMethodHandle::set_conversion(mh(), new_conversion); |
|
2604 |
|
2605 if (java_lang_invoke_CountingMethodHandle::is_instance(mh())) { |
|
2606 assert(ek_orig == _adapter_retype_only, "only one handled"); |
|
2607 ek_opt = _adapter_opt_profiling; |
|
2608 } |
|
2609 |
|
2610 // Done! |
|
2611 java_lang_invoke_MethodHandle::set_vmentry(mh(), entry(ek_opt)); |
|
2612 |
|
2613 // There should be enough memory barriers on exit from native methods |
|
2614 // to ensure that the MH is fully initialized to all threads before |
|
2615 // Java code can publish it in global data structures. |
|
2616 } |
|
2617 |
|
2618 void MethodHandles::ensure_vmlayout_field(Handle target, TRAPS) { |
|
2619 Handle mtype(THREAD, java_lang_invoke_MethodHandle::type(target())); |
|
2620 Handle mtform(THREAD, java_lang_invoke_MethodType::form(mtype())); |
|
2621 if (mtform.is_null()) { THROW(vmSymbols::java_lang_InternalError()); } |
|
2622 if (java_lang_invoke_MethodTypeForm::vmlayout_offset_in_bytes() > 0) { |
|
2623 if (java_lang_invoke_MethodTypeForm::vmlayout(mtform()) == NULL) { |
|
2624 // fill it in |
|
2625 Handle erased_mtype(THREAD, java_lang_invoke_MethodTypeForm::erasedType(mtform())); |
|
2626 TempNewSymbol erased_signature |
|
2627 = java_lang_invoke_MethodType::as_signature(erased_mtype(), /*intern:*/true, CHECK); |
|
2628 methodOop cookie |
|
2629 = SystemDictionary::find_method_handle_invoke(vmSymbols::invokeExact_name(), |
|
2630 erased_signature, |
|
2631 SystemDictionaryHandles::Object_klass(), |
|
2632 THREAD); |
|
2633 java_lang_invoke_MethodTypeForm::init_vmlayout(mtform(), cookie); |
|
2634 } |
|
2635 } |
|
2636 assert(java_lang_invoke_MethodTypeForm::vmslots(mtform()) == argument_slot_count(mtype()), "must agree"); |
|
2637 } |
|
2638 |
|
2639 #ifdef ASSERT |
|
2640 |
|
2641 extern "C" |
|
2642 void print_method_handle(oop mh); |
|
2643 |
|
2644 static void stress_method_handle_walk_impl(Handle mh, TRAPS) { |
|
2645 if (StressMethodHandleWalk) { |
|
2646 // Exercise the MethodHandleWalk code in various ways and validate |
|
2647 // the resulting method oop. Some of these produce output so they |
|
2648 // are guarded under Verbose. |
|
2649 ResourceMark rm; |
|
2650 HandleMark hm; |
|
2651 if (Verbose) { |
|
2652 print_method_handle(mh()); |
|
2653 } |
|
2654 TempNewSymbol name = SymbolTable::new_symbol("invoke", CHECK); |
|
2655 Handle mt = java_lang_invoke_MethodHandle::type(mh()); |
|
2656 TempNewSymbol signature = java_lang_invoke_MethodType::as_signature(mt(), true, CHECK); |
|
2657 MethodHandleCompiler mhc(mh, name, signature, 10000, false, CHECK); |
|
2658 methodHandle m = mhc.compile(CHECK); |
|
2659 if (Verbose) { |
|
2660 m->print_codes(); |
|
2661 } |
|
2662 InterpreterOopMap mask; |
|
2663 OopMapCache::compute_one_oop_map(m, m->code_size() - 1, &mask); |
|
2664 // compile to object code if -Xcomp or WizardMode |
|
2665 if ((WizardMode || |
|
2666 CompilationPolicy::must_be_compiled(m)) |
|
2667 && !instanceKlass::cast(m->method_holder())->is_not_initialized() |
|
2668 && CompilationPolicy::can_be_compiled(m)) { |
|
2669 // Force compilation |
|
2670 CompileBroker::compile_method(m, InvocationEntryBci, |
|
2671 CompilationPolicy::policy()->initial_compile_level(), |
|
2672 methodHandle(), 0, "StressMethodHandleWalk", |
|
2673 CHECK); |
|
2674 } |
|
2675 } |
|
2676 } |
|
2677 |
|
2678 static void stress_method_handle_walk(Handle mh, TRAPS) { |
|
2679 stress_method_handle_walk_impl(mh, THREAD); |
|
2680 if (HAS_PENDING_EXCEPTION) { |
|
2681 oop ex = PENDING_EXCEPTION; |
|
2682 CLEAR_PENDING_EXCEPTION; |
|
2683 tty->print("StressMethodHandleWalk: "); |
|
2684 java_lang_Throwable::print(ex, tty); |
|
2685 tty->cr(); |
|
2686 } |
|
2687 } |
|
2688 #else |
|
2689 |
|
2690 static void stress_method_handle_walk(Handle mh, TRAPS) {} |
|
2691 |
|
2692 #endif |
|
2693 |
|
2694 // |
923 // |
2695 // Here are the native methods on sun.invoke.MethodHandleImpl. |
924 // Here are the native methods in java.lang.invoke.MethodHandleNatives |
2696 // They are the private interface between this JVM and the HotSpot-specific |
925 // They are the private interface between this JVM and the HotSpot-specific |
2697 // Java code that implements JSR 292 method handles. |
926 // Java code that implements JSR 292 method handles. |
2698 // |
927 // |
2699 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way |
928 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way |
2700 // that intrinsic (non-JNI) native methods are defined in HotSpot. |
929 // that intrinsic (non-JNI) native methods are defined in HotSpot. |
2701 // |
930 // |
2702 |
|
2703 // direct method handles for invokestatic or invokespecial |
|
2704 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller); |
|
2705 JVM_ENTRY(void, MHN_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh, |
|
2706 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) { |
|
2707 ResourceMark rm; // for error messages |
|
2708 |
|
2709 // This is the guy we are initializing: |
|
2710 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); } |
|
2711 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); |
|
2712 |
|
2713 // Early returns out of this method leave the DMH in an unfinished state. |
|
2714 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); |
|
2715 |
|
2716 // which method are we really talking about? |
|
2717 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } |
|
2718 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); |
|
2719 if (java_lang_invoke_MemberName::is_instance(target()) && |
|
2720 java_lang_invoke_MemberName::vmindex(target()) == VM_INDEX_UNINITIALIZED) { |
|
2721 MethodHandles::resolve_MemberName(target, CHECK); |
|
2722 } |
|
2723 |
|
2724 KlassHandle receiver_limit; int decode_flags = 0; |
|
2725 methodHandle m = MethodHandles::decode_method(target(), receiver_limit, decode_flags); |
|
2726 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); } |
|
2727 |
|
2728 // The trusted Java code that calls this method should already have performed |
|
2729 // access checks on behalf of the given caller. But, we can verify this. |
|
2730 if (VerifyMethodHandles && caller_jh != NULL) { |
|
2731 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh))); |
|
2732 // If this were a bytecode, the first access check would be against |
|
2733 // the "reference class" mentioned in the CONSTANT_Methodref. |
|
2734 // We don't know at this point which class that was, and if we |
|
2735 // check against m.method_holder we might get the wrong answer. |
|
2736 // So we just make sure to handle this check when the resolution |
|
2737 // happens, when we call resolve_MemberName. |
|
2738 // |
|
2739 // (A public class can inherit public members from private supers, |
|
2740 // and it would be wrong to check access against the private super |
|
2741 // if the original symbolic reference was against the public class.) |
|
2742 // |
|
2743 // If there were a bytecode, the next step would be to lookup the method |
|
2744 // in the reference class, then then check the method's access bits. |
|
2745 // Emulate LinkResolver::check_method_accessability. |
|
2746 klassOop resolved_klass = m->method_holder(); |
|
2747 if (!Reflection::verify_field_access(caller->as_klassOop(), |
|
2748 resolved_klass, resolved_klass, |
|
2749 m->access_flags(), |
|
2750 true)) { |
|
2751 // %%% following cutout belongs in Reflection::verify_field_access? |
|
2752 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(), |
|
2753 resolved_klass, THREAD); |
|
2754 if (!same_pm) { |
|
2755 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string()); |
|
2756 } |
|
2757 } |
|
2758 } |
|
2759 |
|
2760 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK); |
|
2761 stress_method_handle_walk(mh, CHECK); |
|
2762 } |
|
2763 JVM_END |
|
2764 |
|
2765 // bound method handles |
|
2766 JVM_ENTRY(void, MHN_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh, |
|
2767 jobject target_jh, int argnum)) { |
|
2768 ResourceMark rm; // for error messages |
|
2769 |
|
2770 // This is the guy we are initializing: |
|
2771 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); } |
|
2772 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); |
|
2773 |
|
2774 // Early returns out of this method leave the BMH in an unfinished state. |
|
2775 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); |
|
2776 |
|
2777 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } |
|
2778 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); |
|
2779 |
|
2780 if (!java_lang_invoke_MethodHandle::is_instance(target())) { |
|
2781 // Target object is a reflective method. (%%% Do we need this alternate path?) |
|
2782 Untested("init_BMH of non-MH"); |
|
2783 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); } |
|
2784 KlassHandle receiver_limit; int decode_flags = 0; |
|
2785 methodHandle m = MethodHandles::decode_method(target(), receiver_limit, decode_flags); |
|
2786 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m, |
|
2787 receiver_limit, |
|
2788 decode_flags, |
|
2789 CHECK); |
|
2790 } else { |
|
2791 // Build a BMH on top of a DMH or another BMH: |
|
2792 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK); |
|
2793 } |
|
2794 |
|
2795 if (StressMethodHandleWalk) { |
|
2796 if (mh->klass() == SystemDictionary::BoundMethodHandle_klass()) |
|
2797 stress_method_handle_walk(mh, CHECK); |
|
2798 // else don't, since the subclass has not yet initialized its own fields |
|
2799 } |
|
2800 } |
|
2801 JVM_END |
|
2802 |
|
2803 // adapter method handles |
|
2804 JVM_ENTRY(void, MHN_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh, |
|
2805 jobject target_jh, int argnum)) { |
|
2806 // This is the guy we are initializing: |
|
2807 if (mh_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "self is null"); } |
|
2808 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } |
|
2809 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); |
|
2810 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); |
|
2811 |
|
2812 // Early returns out of this method leave the AMH in an unfinished state. |
|
2813 assert(java_lang_invoke_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); |
|
2814 |
|
2815 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK); |
|
2816 stress_method_handle_walk(mh, CHECK); |
|
2817 } |
|
2818 JVM_END |
|
2819 |
|
2820 // method type forms |
|
2821 JVM_ENTRY(void, MHN_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) { |
|
2822 if (erased_jh == NULL) return; |
|
2823 if (TraceMethodHandles) { |
|
2824 tty->print("creating MethodType form "); |
|
2825 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH! |
|
2826 // call Object.toString() |
|
2827 Symbol* name = vmSymbols::toString_name(); |
|
2828 Symbol* sig = vmSymbols::void_string_signature(); |
|
2829 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh))); |
|
2830 JavaValue result(T_OBJECT); |
|
2831 JavaCalls::call_virtual(&result, SystemDictionary::Object_klass(), name, sig, |
|
2832 &args, CHECK); |
|
2833 Handle str(THREAD, (oop)result.get_jobject()); |
|
2834 java_lang_String::print(str, tty); |
|
2835 } |
|
2836 tty->cr(); |
|
2837 } |
|
2838 } |
|
2839 JVM_END |
|
2840 |
|
2841 // debugging and reflection |
|
2842 JVM_ENTRY(jobject, MHN_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) { |
|
2843 Handle mh(THREAD, JNIHandles::resolve(mh_jh)); |
|
2844 if (!java_lang_invoke_MethodHandle::is_instance(mh())) { |
|
2845 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); |
|
2846 } |
|
2847 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL); |
|
2848 return JNIHandles::make_local(THREAD, target); |
|
2849 } |
|
2850 JVM_END |
|
2851 |
|
2852 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) { |
931 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) { |
2853 switch (which) { |
932 switch (which) { |
2854 case MethodHandles::GC_JVM_PUSH_LIMIT: |
|
2855 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF, |
|
2856 "MethodHandlePushLimit parameter must be in valid range"); |
|
2857 return MethodHandlePushLimit; |
|
2858 case MethodHandles::GC_JVM_STACK_MOVE_UNIT: |
|
2859 // return number of words per slot, signed according to stack direction |
|
2860 return MethodHandles::stack_move_unit(); |
|
2861 case MethodHandles::GC_CONV_OP_IMPLEMENTED_MASK: |
|
2862 return MethodHandles::adapter_conversion_ops_supported_mask(); |
|
2863 case MethodHandles::GC_COUNT_GWT: |
933 case MethodHandles::GC_COUNT_GWT: |
2864 #ifdef COMPILER2 |
934 #ifdef COMPILER2 |
2865 return true; |
935 return true; |
2866 #else |
936 #else |
2867 return false; |
937 return false; |