1 /* 2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, Red Hat Inc. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "asm/macroAssembler.hpp" 27 #include "classfile/javaClasses.inline.hpp" 28 #include "classfile/vmClasses.hpp" 29 #include "compiler/disassembler.hpp" 30 #include "interpreter/interpreter.hpp" 31 #include "interpreter/interpreterRuntime.hpp" 32 #include "memory/allocation.inline.hpp" 33 #include "prims/jvmtiExport.hpp" 34 #include "prims/methodHandles.hpp" 35 #include "runtime/flags/flagSetting.hpp" 36 #include "runtime/frame.inline.hpp" 37 #include "runtime/stubRoutines.hpp" 38 39 #define __ Disassembler::hook<MacroAssembler>(__FILE__, __LINE__, _masm)-> 40 41 #ifdef PRODUCT 42 #define BLOCK_COMMENT(str) /* nothing */ 43 #else 44 #define BLOCK_COMMENT(str) __ block_comment(str) 45 #endif 46 47 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") 48 49 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) { 50 if (VerifyMethodHandles) 51 verify_klass(_masm, klass_reg, VM_CLASS_ID(java_lang_Class), 52 "MH argument is a Class"); 53 __ ldr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset())); 54 } 55 56 #ifdef ASSERT 57 static int check_nonzero(const char* xname, int x) { 58 assert(x != 0, "%s should be nonzero", xname); 59 return x; 60 } 61 #define NONZERO(x) check_nonzero(#x, x) 62 #else //ASSERT 63 #define NONZERO(x) (x) 64 #endif //PRODUCT 65 66 #ifdef ASSERT 67 void MethodHandles::verify_klass(MacroAssembler* _masm, 68 Register obj, vmClassID klass_id, 69 const char* error_message) { 70 InstanceKlass** klass_addr = vmClasses::klass_addr_at(klass_id); 71 Klass* klass = vmClasses::klass_at(klass_id); 72 Register temp = rscratch2; 73 Register temp2 = rscratch1; // used by MacroAssembler::cmpptr 74 Label L_ok, L_bad; 75 BLOCK_COMMENT("verify_klass {"); 76 __ verify_oop(obj); 77 __ cbz(obj, L_bad); 78 __ push(RegSet::of(temp, temp2), sp); 79 __ load_klass(temp, obj); 80 __ cmpptr(temp, ExternalAddress((address) klass_addr)); 81 __ br(Assembler::EQ, L_ok); 82 intptr_t super_check_offset = klass->super_check_offset(); 83 __ ldr(temp, Address(temp, super_check_offset)); 84 __ cmpptr(temp, ExternalAddress((address) klass_addr)); 85 __ br(Assembler::EQ, L_ok); 86 __ pop(RegSet::of(temp, temp2), sp); 87 __ bind(L_bad); 88 __ stop(error_message); 89 __ BIND(L_ok); 90 __ pop(RegSet::of(temp, temp2), sp); 91 BLOCK_COMMENT("} verify_klass"); 92 } 93 94 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) { } 95 96 void MethodHandles::verify_method(MacroAssembler* _masm, Register method, vmIntrinsics::ID iid) { 97 BLOCK_COMMENT("verify_method {"); 98 __ verify_method_ptr(method); 99 if (VerifyMethodHandles) { 100 Label L_ok; 101 assert_different_registers(method, rscratch1, rscratch2); 102 const Register method_holder = rscratch1; 103 __ load_method_holder(method_holder, method); 104 105 switch (iid) { 106 case vmIntrinsicID::_invokeBasic: 107 // Require compiled LambdaForm class to be fully initialized. 108 __ lea(rscratch2, Address(method_holder, InstanceKlass::init_state_offset())); 109 __ ldarb(rscratch2, rscratch2); 110 __ cmp(rscratch2, InstanceKlass::fully_initialized); 111 __ br(Assembler::EQ, L_ok); 112 break; 113 114 case vmIntrinsicID::_linkToStatic: 115 __ clinit_barrier(method_holder, rscratch2, &L_ok); 116 break; 117 118 case vmIntrinsicID::_linkToVirtual: 119 case vmIntrinsicID::_linkToSpecial: 120 case vmIntrinsicID::_linkToInterface: 121 // Class initialization check is too strong here. Just ensure that class initialization has been initiated. 122 __ lea(rscratch2, Address(method_holder, InstanceKlass::init_state_offset())); 123 __ ldarb(rscratch2, rscratch2); 124 __ cmp(rscratch2, InstanceKlass::being_initialized); 125 __ br(Assembler::GE, L_ok); 126 127 // init_state check failed, but it may be an abstract interface method 128 __ ldrh(rscratch2, Address(method, Method::access_flags_offset())); 129 __ tbnz(rscratch2, exact_log2(JVM_ACC_ABSTRACT), L_ok); 130 break; 131 132 default: 133 fatal("unexpected intrinsic %d: %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid)); 134 } 135 136 // Method holder init state check failed for a concrete method. 137 __ stop("Method holder klass is not initialized"); 138 __ bind(L_ok); 139 } 140 BLOCK_COMMENT("} verify_method"); 141 } 142 #endif //ASSERT 143 144 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp, 145 bool for_compiler_entry, vmIntrinsics::ID iid) { 146 assert(method == rmethod, "interpreter calling convention"); 147 Label L_no_such_method; 148 __ cbz(rmethod, L_no_such_method); 149 verify_method(_masm, method, iid); 150 151 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) { 152 Label run_compiled_code; 153 // JVMTI events, such as single-stepping, are implemented partly by avoiding running 154 // compiled code in threads for which the event is enabled. Check here for 155 // interp_only_mode if these events CAN be enabled. 156 157 __ ldrw(rscratch1, Address(rthread, JavaThread::interp_only_mode_offset())); 158 __ cbzw(rscratch1, run_compiled_code); 159 __ ldr(rscratch1, Address(method, Method::interpreter_entry_offset())); 160 __ br(rscratch1); 161 __ BIND(run_compiled_code); 162 } 163 164 // The following jump might pass an inline type argument that was erased to Object as oop to a 165 // callee that expects inline type arguments to be passed as fields. We need to call the compiled 166 // value entry (_code->inline_entry_point() or _adapter->c2i_inline_entry()) which will take care 167 // of translating between the calling conventions. 168 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_inline_offset() : 169 Method::from_interpreted_offset(); 170 __ ldr(rscratch1,Address(method, entry_offset)); 171 __ br(rscratch1); 172 __ bind(L_no_such_method); 173 __ far_jump(RuntimeAddress(SharedRuntime::throw_AbstractMethodError_entry())); 174 } 175 176 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm, 177 Register recv, Register method_temp, 178 Register temp2, 179 bool for_compiler_entry) { 180 BLOCK_COMMENT("jump_to_lambda_form {"); 181 // This is the initial entry point of a lazy method handle. 182 // After type checking, it picks up the invoker from the LambdaForm. 183 assert_different_registers(recv, method_temp, temp2); 184 assert(recv != noreg, "required register"); 185 assert(method_temp == rmethod, "required register for loading method"); 186 187 // Load the invoker, as MH -> MH.form -> LF.vmentry 188 __ verify_oop(recv); 189 __ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset())), temp2, rscratch2); 190 __ verify_oop(method_temp); 191 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset())), temp2, rscratch2); 192 __ verify_oop(method_temp); 193 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset())), temp2, rscratch2); 194 __ verify_oop(method_temp); 195 __ access_load_at(T_ADDRESS, IN_HEAP, method_temp, Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset())), noreg, noreg); 196 197 if (VerifyMethodHandles && !for_compiler_entry) { 198 // make sure recv is already on stack 199 __ ldr(temp2, Address(method_temp, Method::const_offset())); 200 __ load_sized_value(temp2, 201 Address(temp2, ConstMethod::size_of_parameters_offset()), 202 sizeof(u2), /*is_signed*/ false); 203 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 204 Label L; 205 __ ldr(rscratch1, __ argument_address(temp2, -1)); 206 __ cmpoop(recv, rscratch1); 207 __ br(Assembler::EQ, L); 208 __ ldr(r0, __ argument_address(temp2, -1)); 209 __ hlt(0); 210 __ BIND(L); 211 } 212 213 jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry, vmIntrinsics::_invokeBasic); 214 BLOCK_COMMENT("} jump_to_lambda_form"); 215 } 216 217 // Code generation 218 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm, 219 vmIntrinsics::ID iid) { 220 const bool not_for_compiler_entry = false; // this is the interpreter entry 221 assert(is_signature_polymorphic(iid), "expected invoke iid"); 222 if (iid == vmIntrinsics::_invokeGeneric || 223 iid == vmIntrinsics::_compiledLambdaForm) { 224 // Perhaps surprisingly, the symbolic references visible to Java are not directly used. 225 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod. 226 // They all allow an appendix argument. 227 __ hlt(0); // empty stubs make SG sick 228 return nullptr; 229 } 230 231 // No need in interpreter entry for linkToNative for now. 232 // Interpreter calls compiled entry through i2c. 233 if (iid == vmIntrinsics::_linkToNative) { 234 __ hlt(0); 235 return nullptr; 236 } 237 238 // r19_sender_sp: sender SP (must preserve; see prepare_to_jump_from_interpreted) 239 // rmethod: Method* 240 // r3: argument locator (parameter slot count, added to rsp) 241 // r1: used as temp to hold mh or receiver 242 // r0, r11: garbage temps, blown away 243 Register argp = r3; // argument list ptr, live on error paths 244 Register temp = r0; 245 Register mh = r1; // MH receiver; dies quickly and is recycled 246 247 // here's where control starts out: 248 __ align(CodeEntryAlignment); 249 address entry_point = __ pc(); 250 251 if (VerifyMethodHandles) { 252 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2"); 253 254 Label L; 255 BLOCK_COMMENT("verify_intrinsic_id {"); 256 __ ldrh(rscratch1, Address(rmethod, Method::intrinsic_id_offset())); 257 __ subs(zr, rscratch1, (int) iid); 258 __ br(Assembler::EQ, L); 259 if (iid == vmIntrinsics::_linkToVirtual || 260 iid == vmIntrinsics::_linkToSpecial) { 261 // could do this for all kinds, but would explode assembly code size 262 trace_method_handle(_masm, "bad Method*::intrinsic_id"); 263 } 264 __ hlt(0); 265 __ bind(L); 266 BLOCK_COMMENT("} verify_intrinsic_id"); 267 } 268 269 // First task: Find out how big the argument list is. 270 Address r3_first_arg_addr; 271 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid); 272 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic"); 273 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) { 274 __ ldr(argp, Address(rmethod, Method::const_offset())); 275 __ load_sized_value(argp, 276 Address(argp, ConstMethod::size_of_parameters_offset()), 277 sizeof(u2), /*is_signed*/ false); 278 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 279 r3_first_arg_addr = __ argument_address(argp, -1); 280 } else { 281 DEBUG_ONLY(argp = noreg); 282 } 283 284 if (!is_signature_polymorphic_static(iid)) { 285 __ ldr(mh, r3_first_arg_addr); 286 DEBUG_ONLY(argp = noreg); 287 } 288 289 // r3_first_arg_addr is live! 290 291 trace_method_handle_interpreter_entry(_masm, iid); 292 if (iid == vmIntrinsics::_invokeBasic) { 293 generate_method_handle_dispatch(_masm, iid, mh, noreg, not_for_compiler_entry); 294 295 } else { 296 // Adjust argument list by popping the trailing MemberName argument. 297 Register recv = noreg; 298 if (MethodHandles::ref_kind_has_receiver(ref_kind)) { 299 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack. 300 __ ldr(recv = r2, r3_first_arg_addr); 301 } 302 DEBUG_ONLY(argp = noreg); 303 Register rmember = rmethod; // MemberName ptr; incoming method ptr is dead now 304 __ pop(rmember); // extract last argument 305 generate_method_handle_dispatch(_masm, iid, recv, rmember, not_for_compiler_entry); 306 } 307 308 return entry_point; 309 } 310 311 void MethodHandles::jump_to_native_invoker(MacroAssembler* _masm, Register nep_reg, Register temp_target) { 312 BLOCK_COMMENT("jump_to_native_invoker {"); 313 assert_different_registers(nep_reg, temp_target); 314 assert(nep_reg != noreg, "required register"); 315 316 // Load the invoker, as NEP -> .invoker 317 __ verify_oop(nep_reg); 318 __ access_load_at(T_ADDRESS, IN_HEAP, temp_target, 319 Address(nep_reg, NONZERO(jdk_internal_foreign_abi_NativeEntryPoint::downcall_stub_address_offset_in_bytes())), 320 noreg, noreg); 321 322 __ br(temp_target); 323 BLOCK_COMMENT("} jump_to_native_invoker"); 324 } 325 326 327 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm, 328 vmIntrinsics::ID iid, 329 Register receiver_reg, 330 Register member_reg, 331 bool for_compiler_entry) { 332 assert(is_signature_polymorphic(iid), "expected invoke iid"); 333 // temps used in this code are not used in *either* compiled or interpreted calling sequences 334 Register temp1 = r10; 335 Register temp2 = r11; 336 Register temp3 = r14; 337 if (for_compiler_entry) { 338 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic || iid == vmIntrinsics::_linkToNative ? noreg : j_rarg0), "only valid assignment"); 339 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7); 340 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7); 341 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7); 342 } 343 344 assert_different_registers(temp1, temp2, temp3, receiver_reg); 345 assert_different_registers(temp1, temp2, temp3, member_reg); 346 347 if (iid == vmIntrinsics::_invokeBasic) { 348 // indirect through MH.form.vmentry.vmtarget 349 jump_to_lambda_form(_masm, receiver_reg, rmethod, temp1, for_compiler_entry); 350 351 } else if (iid == vmIntrinsics::_linkToNative) { 352 assert(for_compiler_entry, "only compiler entry is supported"); 353 jump_to_native_invoker(_masm, member_reg, temp1); 354 } else { 355 // The method is a member invoker used by direct method handles. 356 if (VerifyMethodHandles) { 357 // make sure the trailing argument really is a MemberName (caller responsibility) 358 verify_klass(_masm, member_reg, VM_CLASS_ID(java_lang_invoke_MemberName), 359 "MemberName required for invokeVirtual etc."); 360 } 361 362 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset())); 363 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset())); 364 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::method_offset())); 365 Address vmtarget_method( rmethod, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset())); 366 367 Register temp1_recv_klass = temp1; 368 if (iid != vmIntrinsics::_linkToStatic) { 369 __ verify_oop(receiver_reg); 370 if (iid == vmIntrinsics::_linkToSpecial) { 371 // Don't actually load the klass; just null-check the receiver. 372 __ null_check(receiver_reg); 373 } else { 374 // load receiver klass itself 375 __ load_klass(temp1_recv_klass, receiver_reg); 376 __ verify_klass_ptr(temp1_recv_klass); 377 } 378 BLOCK_COMMENT("check_receiver {"); 379 // The receiver for the MemberName must be in receiver_reg. 380 // Check the receiver against the MemberName.clazz 381 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) { 382 // Did not load it above... 383 __ load_klass(temp1_recv_klass, receiver_reg); 384 __ verify_klass_ptr(temp1_recv_klass); 385 } 386 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) { 387 Label L_ok; 388 Register temp2_defc = temp2; 389 __ load_heap_oop(temp2_defc, member_clazz, temp3, rscratch2); 390 load_klass_from_Class(_masm, temp2_defc); 391 __ verify_klass_ptr(temp2_defc); 392 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok); 393 // If we get here, the type check failed! 394 __ hlt(0); 395 // __ STOP("receiver class disagrees with MemberName.clazz"); 396 __ bind(L_ok); 397 } 398 BLOCK_COMMENT("} check_receiver"); 399 } 400 if (iid == vmIntrinsics::_linkToSpecial || 401 iid == vmIntrinsics::_linkToStatic) { 402 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass 403 } 404 405 // Live registers at this point: 406 // member_reg - MemberName that was the trailing argument 407 // temp1_recv_klass - klass of stacked receiver, if needed 408 // r19 - interpreter linkage (if interpreted) 409 // r1 ... r0 - compiler arguments (if compiled) 410 411 Label L_incompatible_class_change_error; 412 switch (iid) { 413 case vmIntrinsics::_linkToSpecial: 414 if (VerifyMethodHandles) { 415 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3); 416 } 417 __ load_heap_oop(rmethod, member_vmtarget, temp3, rscratch2); 418 __ access_load_at(T_ADDRESS, IN_HEAP, rmethod, vmtarget_method, noreg, noreg); 419 break; 420 421 case vmIntrinsics::_linkToStatic: 422 if (VerifyMethodHandles) { 423 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3); 424 } 425 __ load_heap_oop(rmethod, member_vmtarget, temp3, rscratch2); 426 __ access_load_at(T_ADDRESS, IN_HEAP, rmethod, vmtarget_method, noreg, noreg); 427 break; 428 429 case vmIntrinsics::_linkToVirtual: 430 { 431 // same as TemplateTable::invokevirtual, 432 // minus the CP setup and profiling: 433 434 if (VerifyMethodHandles) { 435 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3); 436 } 437 438 // pick out the vtable index from the MemberName, and then we can discard it: 439 Register temp2_index = temp2; 440 __ access_load_at(T_ADDRESS, IN_HEAP, temp2_index, member_vmindex, noreg, noreg); 441 442 if (VerifyMethodHandles) { 443 Label L_index_ok; 444 __ cmpw(temp2_index, 0U); 445 __ br(Assembler::GE, L_index_ok); 446 __ hlt(0); 447 __ BIND(L_index_ok); 448 } 449 450 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget 451 // at this point. And VerifyMethodHandles has already checked clazz, if needed. 452 453 // get target Method* & entry point 454 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rmethod); 455 break; 456 } 457 458 case vmIntrinsics::_linkToInterface: 459 { 460 // same as TemplateTable::invokeinterface 461 // (minus the CP setup and profiling, with different argument motion) 462 if (VerifyMethodHandles) { 463 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3); 464 } 465 466 Register temp3_intf = temp3; 467 __ load_heap_oop(temp3_intf, member_clazz, temp2, rscratch2); 468 load_klass_from_Class(_masm, temp3_intf); 469 __ verify_klass_ptr(temp3_intf); 470 471 Register rindex = rmethod; 472 __ access_load_at(T_ADDRESS, IN_HEAP, rindex, member_vmindex, noreg, noreg); 473 if (VerifyMethodHandles) { 474 Label L; 475 __ cmpw(rindex, 0U); 476 __ br(Assembler::GE, L); 477 __ hlt(0); 478 __ bind(L); 479 } 480 481 // given intf, index, and recv klass, dispatch to the implementation method 482 __ lookup_interface_method(temp1_recv_klass, temp3_intf, 483 // note: next two args must be the same: 484 rindex, rmethod, 485 temp2, 486 L_incompatible_class_change_error); 487 break; 488 } 489 490 default: 491 fatal("unexpected intrinsic %d: %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid)); 492 break; 493 } 494 495 // live at this point: rmethod, r19_sender_sp (if interpreted) 496 497 // After figuring out which concrete method to call, jump into it. 498 // Note that this works in the interpreter with no data motion. 499 // But the compiled version will require that r2_recv be shifted out. 500 jump_from_method_handle(_masm, rmethod, temp1, for_compiler_entry, iid); 501 if (iid == vmIntrinsics::_linkToInterface) { 502 __ bind(L_incompatible_class_change_error); 503 __ far_jump(RuntimeAddress(SharedRuntime::throw_IncompatibleClassChangeError_entry())); 504 } 505 } 506 } 507 508 #ifndef PRODUCT 509 void trace_method_handle_stub(const char* adaptername, 510 oopDesc* mh, 511 intptr_t* saved_regs, 512 intptr_t* entry_sp) { } 513 514 // The stub wraps the arguments in a struct on the stack to avoid 515 // dealing with the different calling conventions for passing 6 516 // arguments. 517 struct MethodHandleStubArguments { 518 const char* adaptername; 519 oopDesc* mh; 520 intptr_t* saved_regs; 521 intptr_t* entry_sp; 522 }; 523 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) { } 524 525 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { } 526 #endif //PRODUCT