methodHandles.hpp revision 1879:f95d63e2154a
1/* 2 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_PRIMS_METHODHANDLES_HPP 26#define SHARE_VM_PRIMS_METHODHANDLES_HPP 27 28#include "classfile/javaClasses.hpp" 29#include "classfile/vmSymbols.hpp" 30#include "runtime/frame.inline.hpp" 31#include "runtime/globals.hpp" 32#include "runtime/interfaceSupport.hpp" 33 34class MacroAssembler; 35class Label; 36class MethodHandleEntry; 37 38class MethodHandles: AllStatic { 39 // JVM support for MethodHandle, MethodType, and related types 40 // in java.dyn and java.dyn.hotspot. 41 // See also javaClasses for layouts java_dyn_Method{Handle,Type,Type::Form}. 42 public: 43 enum EntryKind { 44 _raise_exception, // stub for error generation from other stubs 45 _invokestatic_mh, // how a MH emulates invokestatic 46 _invokespecial_mh, // ditto for the other invokes... 47 _invokevirtual_mh, 48 _invokeinterface_mh, 49 _bound_ref_mh, // reference argument is bound 50 _bound_int_mh, // int argument is bound (via an Integer or Float) 51 _bound_long_mh, // long argument is bound (via a Long or Double) 52 _bound_ref_direct_mh, // same as above, with direct linkage to methodOop 53 _bound_int_direct_mh, 54 _bound_long_direct_mh, 55 56 _adapter_mh_first, // adapter sequence goes here... 57 _adapter_retype_only = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_RETYPE_ONLY, 58 _adapter_retype_raw = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_RETYPE_RAW, 59 _adapter_check_cast = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_CHECK_CAST, 60 _adapter_prim_to_prim = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_PRIM_TO_PRIM, 61 _adapter_ref_to_prim = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_REF_TO_PRIM, 62 _adapter_prim_to_ref = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_PRIM_TO_REF, 63 _adapter_swap_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_SWAP_ARGS, 64 _adapter_rot_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_ROT_ARGS, 65 _adapter_dup_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_DUP_ARGS, 66 _adapter_drop_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_DROP_ARGS, 67 _adapter_collect_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_COLLECT_ARGS, 68 _adapter_spread_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_SPREAD_ARGS, 69 _adapter_flyby = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_FLYBY, 70 _adapter_ricochet = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_RICOCHET, 71 _adapter_mh_last = _adapter_mh_first + sun_dyn_AdapterMethodHandle::CONV_OP_LIMIT - 1, 72 73 // Optimized adapter types 74 75 // argument list reordering 76 _adapter_opt_swap_1, 77 _adapter_opt_swap_2, 78 _adapter_opt_rot_1_up, 79 _adapter_opt_rot_1_down, 80 _adapter_opt_rot_2_up, 81 _adapter_opt_rot_2_down, 82 // primitive single to single: 83 _adapter_opt_i2i, // i2c, i2z, i2b, i2s 84 // primitive double to single: 85 _adapter_opt_l2i, 86 _adapter_opt_d2f, 87 // primitive single to double: 88 _adapter_opt_i2l, 89 _adapter_opt_f2d, 90 // conversion between floating point and integer type is handled by Java 91 92 // reference to primitive: 93 _adapter_opt_unboxi, 94 _adapter_opt_unboxl, 95 96 // spreading (array length cases 0, 1, >=2) 97 _adapter_opt_spread_0, 98 _adapter_opt_spread_1, 99 _adapter_opt_spread_more, 100 101 _EK_LIMIT, 102 _EK_FIRST = 0 103 }; 104 105 public: 106 static bool enabled() { return _enabled; } 107 static void set_enabled(bool z); 108 109 private: 110 enum { // import sun_dyn_AdapterMethodHandle::CONV_OP_* 111 CONV_OP_LIMIT = sun_dyn_AdapterMethodHandle::CONV_OP_LIMIT, 112 CONV_OP_MASK = sun_dyn_AdapterMethodHandle::CONV_OP_MASK, 113 CONV_VMINFO_MASK = sun_dyn_AdapterMethodHandle::CONV_VMINFO_MASK, 114 CONV_VMINFO_SHIFT = sun_dyn_AdapterMethodHandle::CONV_VMINFO_SHIFT, 115 CONV_OP_SHIFT = sun_dyn_AdapterMethodHandle::CONV_OP_SHIFT, 116 CONV_DEST_TYPE_SHIFT = sun_dyn_AdapterMethodHandle::CONV_DEST_TYPE_SHIFT, 117 CONV_SRC_TYPE_SHIFT = sun_dyn_AdapterMethodHandle::CONV_SRC_TYPE_SHIFT, 118 CONV_STACK_MOVE_SHIFT = sun_dyn_AdapterMethodHandle::CONV_STACK_MOVE_SHIFT, 119 CONV_STACK_MOVE_MASK = sun_dyn_AdapterMethodHandle::CONV_STACK_MOVE_MASK 120 }; 121 122 static bool _enabled; 123 static MethodHandleEntry* _entries[_EK_LIMIT]; 124 static const char* _entry_names[_EK_LIMIT+1]; 125 static jobject _raise_exception_method; 126 127 // Adapters. 128 static MethodHandlesAdapterBlob* _adapter_code; 129 static int _adapter_code_size; 130 131 static bool ek_valid(EntryKind ek) { return (uint)ek < (uint)_EK_LIMIT; } 132 static bool conv_op_valid(int op) { return (uint)op < (uint)CONV_OP_LIMIT; } 133 134 public: 135 static bool have_entry(EntryKind ek) { return ek_valid(ek) && _entries[ek] != NULL; } 136 static MethodHandleEntry* entry(EntryKind ek) { assert(ek_valid(ek), "initialized"); 137 return _entries[ek]; } 138 static const char* entry_name(EntryKind ek) { assert(ek_valid(ek), "oob"); 139 return _entry_names[ek]; } 140 static EntryKind adapter_entry_kind(int op) { assert(conv_op_valid(op), "oob"); 141 return EntryKind(_adapter_mh_first + op); } 142 143 static void init_entry(EntryKind ek, MethodHandleEntry* me) { 144 assert(ek_valid(ek), "oob"); 145 assert(_entries[ek] == NULL, "no double initialization"); 146 _entries[ek] = me; 147 } 148 149 // Some adapter helper functions. 150 static void get_ek_bound_mh_info(EntryKind ek, BasicType& arg_type, int& arg_mask, int& arg_slots) { 151 switch (ek) { 152 case _bound_int_mh : // fall-thru 153 case _bound_int_direct_mh : arg_type = T_INT; arg_mask = _INSERT_INT_MASK; break; 154 case _bound_long_mh : // fall-thru 155 case _bound_long_direct_mh: arg_type = T_LONG; arg_mask = _INSERT_LONG_MASK; break; 156 case _bound_ref_mh : // fall-thru 157 case _bound_ref_direct_mh : arg_type = T_OBJECT; arg_mask = _INSERT_REF_MASK; break; 158 default: ShouldNotReachHere(); 159 } 160 arg_slots = type2size[arg_type]; 161 } 162 163 static void get_ek_adapter_opt_swap_rot_info(EntryKind ek, int& swap_bytes, int& rotate) { 164 int swap_slots = 0; 165 switch (ek) { 166 case _adapter_opt_swap_1: swap_slots = 1; rotate = 0; break; 167 case _adapter_opt_swap_2: swap_slots = 2; rotate = 0; break; 168 case _adapter_opt_rot_1_up: swap_slots = 1; rotate = 1; break; 169 case _adapter_opt_rot_1_down: swap_slots = 1; rotate = -1; break; 170 case _adapter_opt_rot_2_up: swap_slots = 2; rotate = 1; break; 171 case _adapter_opt_rot_2_down: swap_slots = 2; rotate = -1; break; 172 default: ShouldNotReachHere(); 173 } 174 // Return the size of the stack slots to move in bytes. 175 swap_bytes = swap_slots * Interpreter::stackElementSize; 176 } 177 178 static int get_ek_adapter_opt_spread_info(EntryKind ek) { 179 switch (ek) { 180 case _adapter_opt_spread_0: return 0; 181 case _adapter_opt_spread_1: return 1; 182 default : return -1; 183 } 184 } 185 186 static methodOop raise_exception_method() { 187 oop rem = JNIHandles::resolve(_raise_exception_method); 188 assert(rem == NULL || rem->is_method(), ""); 189 return (methodOop) rem; 190 } 191 static void set_raise_exception_method(methodOop rem) { 192 assert(_raise_exception_method == NULL, ""); 193 _raise_exception_method = JNIHandles::make_global(Handle(rem)); 194 } 195 196 static jint adapter_conversion(int conv_op, BasicType src, BasicType dest, 197 int stack_move = 0, int vminfo = 0) { 198 assert(conv_op_valid(conv_op), "oob"); 199 jint conv = ((conv_op << CONV_OP_SHIFT) 200 | (src << CONV_SRC_TYPE_SHIFT) 201 | (dest << CONV_DEST_TYPE_SHIFT) 202 | (stack_move << CONV_STACK_MOVE_SHIFT) 203 | (vminfo << CONV_VMINFO_SHIFT) 204 ); 205 assert(adapter_conversion_op(conv) == conv_op, "decode conv_op"); 206 assert(adapter_conversion_src_type(conv) == src, "decode src"); 207 assert(adapter_conversion_dest_type(conv) == dest, "decode dest"); 208 assert(adapter_conversion_stack_move(conv) == stack_move, "decode stack_move"); 209 assert(adapter_conversion_vminfo(conv) == vminfo, "decode vminfo"); 210 return conv; 211 } 212 static int adapter_conversion_op(jint conv) { 213 return ((conv >> CONV_OP_SHIFT) & 0xF); 214 } 215 static BasicType adapter_conversion_src_type(jint conv) { 216 return (BasicType)((conv >> CONV_SRC_TYPE_SHIFT) & 0xF); 217 } 218 static BasicType adapter_conversion_dest_type(jint conv) { 219 return (BasicType)((conv >> CONV_DEST_TYPE_SHIFT) & 0xF); 220 } 221 static int adapter_conversion_stack_move(jint conv) { 222 return (conv >> CONV_STACK_MOVE_SHIFT); 223 } 224 static int adapter_conversion_vminfo(jint conv) { 225 return (conv >> CONV_VMINFO_SHIFT) & CONV_VMINFO_MASK; 226 } 227 228 // Bit mask of conversion_op values. May vary by platform. 229 static int adapter_conversion_ops_supported_mask(); 230 231 // Offset in words that the interpreter stack pointer moves when an argument is pushed. 232 // The stack_move value must always be a multiple of this. 233 static int stack_move_unit() { 234 return frame::interpreter_frame_expression_stack_direction() * Interpreter::stackElementWords; 235 } 236 237 enum { CONV_VMINFO_SIGN_FLAG = 0x80 }; 238 // Shift values for prim-to-prim conversions. 239 static int adapter_prim_to_prim_subword_vminfo(BasicType dest) { 240 if (dest == T_BOOLEAN) return (BitsPerInt - 1); // boolean is 1 bit 241 if (dest == T_CHAR) return (BitsPerInt - BitsPerShort); 242 if (dest == T_BYTE) return (BitsPerInt - BitsPerByte ) | CONV_VMINFO_SIGN_FLAG; 243 if (dest == T_SHORT) return (BitsPerInt - BitsPerShort) | CONV_VMINFO_SIGN_FLAG; 244 return 0; // case T_INT 245 } 246 // Shift values for unboxing a primitive. 247 static int adapter_unbox_subword_vminfo(BasicType dest) { 248 if (dest == T_BOOLEAN) return (BitsPerInt - BitsPerByte ); // implemented as 1 byte 249 if (dest == T_CHAR) return (BitsPerInt - BitsPerShort); 250 if (dest == T_BYTE) return (BitsPerInt - BitsPerByte ) | CONV_VMINFO_SIGN_FLAG; 251 if (dest == T_SHORT) return (BitsPerInt - BitsPerShort) | CONV_VMINFO_SIGN_FLAG; 252 return 0; // case T_INT 253 } 254 // Here is the transformation the i2i adapter must perform: 255 static int truncate_subword_from_vminfo(jint value, int vminfo) { 256 jint tem = value << vminfo; 257 if ((vminfo & CONV_VMINFO_SIGN_FLAG) != 0) { 258 return (jint)tem >> vminfo; 259 } else { 260 return (juint)tem >> vminfo; 261 } 262 } 263 264 static inline address from_compiled_entry(EntryKind ek); 265 static inline address from_interpreted_entry(EntryKind ek); 266 267 // helpers for decode_method. 268 static methodOop decode_methodOop(methodOop m, int& decode_flags_result); 269 static methodOop decode_vmtarget(oop vmtarget, int vmindex, oop mtype, klassOop& receiver_limit_result, int& decode_flags_result); 270 static methodOop decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result); 271 static methodOop decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result); 272 static methodOop decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result); 273 static methodOop decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result); 274 static methodOop decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result); 275 276 // Find out how many stack slots an mh pushes or pops. 277 // The result is *not* reported as a multiple of stack_move_unit(); 278 // It is a signed net number of pushes (a difference in vmslots). 279 // To compare with a stack_move value, first multiply by stack_move_unit(). 280 static int decode_MethodHandle_stack_pushes(oop mh); 281 282 public: 283 // working with member names 284 static void resolve_MemberName(Handle mname, TRAPS); // compute vmtarget/vmindex from name/type 285 static void expand_MemberName(Handle mname, int suppress, TRAPS); // expand defc/name/type if missing 286 static Handle new_MemberName(TRAPS); // must be followed by init_MemberName 287 static void init_MemberName(oop mname_oop, oop target); // compute vmtarget/vmindex from target 288 static void init_MemberName(oop mname_oop, methodOop m, bool do_dispatch = true); 289 static void init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset); 290 static int find_MemberNames(klassOop k, symbolOop name, symbolOop sig, 291 int mflags, klassOop caller, 292 int skip, objArrayOop results); 293 // bit values for suppress argument to expand_MemberName: 294 enum { _suppress_defc = 1, _suppress_name = 2, _suppress_type = 4 }; 295 296 // Generate MethodHandles adapters. 297 static void generate_adapters(); 298 299 // Called from InterpreterGenerator and MethodHandlesAdapterGenerator. 300 static address generate_method_handle_interpreter_entry(MacroAssembler* _masm); 301 static void generate_method_handle_stub(MacroAssembler* _masm, EntryKind ek); 302 303 // argument list parsing 304 static int argument_slot(oop method_type, int arg); 305 static int argument_slot_count(oop method_type) { return argument_slot(method_type, -1); } 306 static int argument_slot_to_argnum(oop method_type, int argslot); 307 308 // Runtime support 309 enum { // bit-encoded flags from decode_method or decode_vmref 310 _dmf_has_receiver = 0x01, // target method has leading reference argument 311 _dmf_does_dispatch = 0x02, // method handle performs virtual or interface dispatch 312 _dmf_from_interface = 0x04, // peforms interface dispatch 313 _DMF_DIRECT_MASK = (_dmf_from_interface*2 - _dmf_has_receiver), 314 _dmf_binds_method = 0x08, 315 _dmf_binds_argument = 0x10, 316 _DMF_BOUND_MASK = (_dmf_binds_argument*2 - _dmf_binds_method), 317 _dmf_adapter_lsb = 0x20, 318 _DMF_ADAPTER_MASK = (_dmf_adapter_lsb << CONV_OP_LIMIT) - _dmf_adapter_lsb 319 }; 320 static methodOop decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result); 321 enum { 322 // format of query to getConstant: 323 GC_JVM_PUSH_LIMIT = 0, 324 GC_JVM_STACK_MOVE_UNIT = 1, 325 GC_CONV_OP_IMPLEMENTED_MASK = 2, 326 327 // format of result from getTarget / encode_target: 328 ETF_HANDLE_OR_METHOD_NAME = 0, // all available data (immediate MH or method) 329 ETF_DIRECT_HANDLE = 1, // ultimate method handle (will be a DMH, may be self) 330 ETF_METHOD_NAME = 2, // ultimate method as MemberName 331 ETF_REFLECT_METHOD = 3 // ultimate method as java.lang.reflect object (sans refClass) 332 }; 333 static int get_named_constant(int which, Handle name_box, TRAPS); 334 static oop encode_target(Handle mh, int format, TRAPS); // report vmtarget (to Java code) 335 static bool class_cast_needed(klassOop src, klassOop dst); 336 337 static instanceKlassHandle resolve_instance_klass(oop java_mirror_oop, TRAPS); 338 static instanceKlassHandle resolve_instance_klass(jclass java_mirror_jh, TRAPS) { 339 return resolve_instance_klass(JNIHandles::resolve(java_mirror_jh), THREAD); 340 } 341 342 private: 343 // These checkers operate on a pair of whole MethodTypes: 344 static const char* check_method_type_change(oop src_mtype, int src_beg, int src_end, 345 int insert_argnum, oop insert_type, 346 int change_argnum, oop change_type, 347 int delete_argnum, 348 oop dst_mtype, int dst_beg, int dst_end, 349 bool raw = false); 350 static const char* check_method_type_insertion(oop src_mtype, 351 int insert_argnum, oop insert_type, 352 oop dst_mtype) { 353 oop no_ref = NULL; 354 return check_method_type_change(src_mtype, 0, -1, 355 insert_argnum, insert_type, 356 -1, no_ref, -1, dst_mtype, 0, -1); 357 } 358 static const char* check_method_type_conversion(oop src_mtype, 359 int change_argnum, oop change_type, 360 oop dst_mtype) { 361 oop no_ref = NULL; 362 return check_method_type_change(src_mtype, 0, -1, -1, no_ref, 363 change_argnum, change_type, 364 -1, dst_mtype, 0, -1); 365 } 366 static const char* check_method_type_passthrough(oop src_mtype, oop dst_mtype, bool raw) { 367 oop no_ref = NULL; 368 return check_method_type_change(src_mtype, 0, -1, 369 -1, no_ref, -1, no_ref, -1, 370 dst_mtype, 0, -1, raw); 371 } 372 373 // These checkers operate on pairs of argument or return types: 374 static const char* check_argument_type_change(BasicType src_type, klassOop src_klass, 375 BasicType dst_type, klassOop dst_klass, 376 int argnum, bool raw = false); 377 378 static const char* check_argument_type_change(oop src_type, oop dst_type, 379 int argnum, bool raw = false) { 380 klassOop src_klass = NULL, dst_klass = NULL; 381 BasicType src_bt = java_lang_Class::as_BasicType(src_type, &src_klass); 382 BasicType dst_bt = java_lang_Class::as_BasicType(dst_type, &dst_klass); 383 return check_argument_type_change(src_bt, src_klass, 384 dst_bt, dst_klass, argnum, raw); 385 } 386 387 static const char* check_return_type_change(oop src_type, oop dst_type, bool raw = false) { 388 return check_argument_type_change(src_type, dst_type, -1, raw); 389 } 390 391 static const char* check_return_type_change(BasicType src_type, klassOop src_klass, 392 BasicType dst_type, klassOop dst_klass) { 393 return check_argument_type_change(src_type, src_klass, dst_type, dst_klass, -1); 394 } 395 396 static const char* check_method_receiver(methodOop m, klassOop passed_recv_type); 397 398 // These verifiers can block, and will throw an error if the checking fails: 399 static void verify_vmslots(Handle mh, TRAPS); 400 static void verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS); 401 402 static void verify_method_type(methodHandle m, Handle mtype, 403 bool has_bound_oop, 404 KlassHandle bound_oop_type, 405 TRAPS); 406 407 static void verify_method_signature(methodHandle m, Handle mtype, 408 int first_ptype_pos, 409 KlassHandle insert_ptype, TRAPS); 410 411 static void verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS); 412 static void verify_BoundMethodHandle(Handle mh, Handle target, int argnum, 413 bool direct_to_method, TRAPS); 414 static void verify_BoundMethodHandle_with_receiver(Handle mh, methodHandle m, TRAPS); 415 static void verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS); 416 417 public: 418 419 // Fill in the fields of a DirectMethodHandle mh. (MH.type must be pre-filled.) 420 static void init_DirectMethodHandle(Handle mh, methodHandle method, bool do_dispatch, TRAPS); 421 422 // Fill in the fields of a BoundMethodHandle mh. (MH.type, BMH.argument must be pre-filled.) 423 static void init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS); 424 static void init_BoundMethodHandle_with_receiver(Handle mh, 425 methodHandle original_m, 426 KlassHandle receiver_limit, 427 int decode_flags, 428 TRAPS); 429 430 // Fill in the fields of an AdapterMethodHandle mh. (MH.type must be pre-filled.) 431 static void init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS); 432 433#ifdef ASSERT 434 static bool spot_check_entry_names(); 435#endif 436 437 private: 438 static methodHandle dispatch_decoded_method(methodHandle m, 439 KlassHandle receiver_limit, 440 int decode_flags, 441 KlassHandle receiver_klass, 442 TRAPS); 443 444 static bool same_basic_type_for_arguments(BasicType src, BasicType dst, 445 bool raw = false, 446 bool for_return = false); 447 static bool same_basic_type_for_returns(BasicType src, BasicType dst, bool raw = false) { 448 return same_basic_type_for_arguments(src, dst, raw, true); 449 } 450 451 enum { // arg_mask values 452 _INSERT_NO_MASK = -1, 453 _INSERT_REF_MASK = 0, 454 _INSERT_INT_MASK = 1, 455 _INSERT_LONG_MASK = 3 456 }; 457 static void insert_arg_slots(MacroAssembler* _masm, 458 RegisterOrConstant arg_slots, 459 int arg_mask, 460 Register argslot_reg, 461 Register temp_reg, Register temp2_reg, Register temp3_reg = noreg); 462 463 static void remove_arg_slots(MacroAssembler* _masm, 464 RegisterOrConstant arg_slots, 465 Register argslot_reg, 466 Register temp_reg, Register temp2_reg, Register temp3_reg = noreg); 467 468 static void trace_method_handle(MacroAssembler* _masm, const char* adaptername) PRODUCT_RETURN; 469}; 470 471 472// Access methods for the "entry" field of a java.dyn.MethodHandle. 473// The field is primarily a jump target for compiled calls. 474// However, we squirrel away some nice pointers for other uses, 475// just before the jump target. 476// Aspects of a method handle entry: 477// - from_compiled_entry - stub used when compiled code calls the MH 478// - from_interpreted_entry - stub used when the interpreter calls the MH 479// - type_checking_entry - stub for runtime casting between MHForm siblings (NYI) 480class MethodHandleEntry { 481 public: 482 class Data { 483 friend class MethodHandleEntry; 484 size_t _total_size; // size including Data and code stub 485 MethodHandleEntry* _type_checking_entry; 486 address _from_interpreted_entry; 487 MethodHandleEntry* method_entry() { return (MethodHandleEntry*)(this + 1); } 488 }; 489 490 Data* data() { return (Data*)this - 1; } 491 492 address start_address() { return (address) data(); } 493 address end_address() { return start_address() + data()->_total_size; } 494 495 address from_compiled_entry() { return (address) this; } 496 497 address from_interpreted_entry() { return data()->_from_interpreted_entry; } 498 void set_from_interpreted_entry(address e) { data()->_from_interpreted_entry = e; } 499 500 MethodHandleEntry* type_checking_entry() { return data()->_type_checking_entry; } 501 void set_type_checking_entry(MethodHandleEntry* e) { data()->_type_checking_entry = e; } 502 503 void set_end_address(address end_addr) { 504 size_t total_size = end_addr - start_address(); 505 assert(total_size > 0 && total_size < 0x1000, "reasonable end address"); 506 data()->_total_size = total_size; 507 } 508 509 // Compiler support: 510 static int from_interpreted_entry_offset_in_bytes() { 511 return (int)( offset_of(Data, _from_interpreted_entry) - sizeof(Data) ); 512 } 513 static int type_checking_entry_offset_in_bytes() { 514 return (int)( offset_of(Data, _from_interpreted_entry) - sizeof(Data) ); 515 } 516 517 static address start_compiled_entry(MacroAssembler* _masm, 518 address interpreted_entry = NULL); 519 static MethodHandleEntry* finish_compiled_entry(MacroAssembler* masm, address start_addr); 520}; 521 522address MethodHandles::from_compiled_entry(EntryKind ek) { return entry(ek)->from_compiled_entry(); } 523address MethodHandles::from_interpreted_entry(EntryKind ek) { return entry(ek)->from_interpreted_entry(); } 524 525 526//------------------------------------------------------------------------------ 527// MethodHandlesAdapterGenerator 528// 529class MethodHandlesAdapterGenerator : public StubCodeGenerator { 530public: 531 MethodHandlesAdapterGenerator(CodeBuffer* code) : StubCodeGenerator(code) {} 532 533 void generate(); 534}; 535 536#endif // SHARE_VM_PRIMS_METHODHANDLES_HPP 537