1 /* 2 * Copyright (c) 2008, 2014, 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 #include "precompiled.hpp" 26 #include "asm/macroAssembler.hpp" 27 #include "classfile/javaClasses.inline.hpp" 28 #include "interpreter/interpreter.hpp" 29 #include "interpreter/interp_masm.hpp" 30 #include "memory/allocation.inline.hpp" 31 #include "prims/methodHandles.hpp" 32 33 #define __ _masm-> 34 35 #ifdef PRODUCT 36 #define BLOCK_COMMENT(str) /* nothing */ 37 #define STOP(error) stop(error) 38 #else 39 #define BLOCK_COMMENT(str) __ block_comment(str) 40 #define STOP(error) block_comment(error); __ stop(error) 41 #endif 42 43 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") 44 45 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant. 46 static RegisterOrConstant constant(int value) { 47 return RegisterOrConstant(value); 48 } 49 50 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp_reg, Register temp2_reg) { 51 if (VerifyMethodHandles) 52 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), temp_reg, temp2_reg, 53 "MH argument is a Class"); 54 __ ld_ptr(Address(klass_reg, java_lang_Class::klass_offset_in_bytes()), klass_reg); 55 } 56 57 #ifdef ASSERT 58 static int check_nonzero(const char* xname, int x) { 59 assert(x != 0, err_msg("%s should be nonzero", xname)); 60 return x; 61 } 62 #define NONZERO(x) check_nonzero(#x, x) 63 #else //ASSERT 64 #define NONZERO(x) (x) 65 #endif //ASSERT 66 67 #ifdef ASSERT 68 void MethodHandles::verify_klass(MacroAssembler* _masm, 69 Register obj_reg, SystemDictionary::WKID klass_id, 70 Register temp_reg, Register temp2_reg, 71 const char* error_message) { 72 Klass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id); 73 KlassHandle klass = SystemDictionary::well_known_klass(klass_id); 74 bool did_save = false; 75 if (temp_reg == noreg || temp2_reg == noreg) { 76 temp_reg = L1; 77 temp2_reg = L2; 78 __ save_frame_and_mov(0, obj_reg, L0); 79 obj_reg = L0; 80 did_save = true; 81 } 82 Label L_ok, L_bad; 83 BLOCK_COMMENT("verify_klass {"); 84 __ verify_oop(obj_reg); 85 __ br_null_short(obj_reg, Assembler::pn, L_bad); 86 __ load_klass(obj_reg, temp_reg); 87 __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg); 88 __ ld_ptr(Address(temp2_reg, 0), temp2_reg); 89 __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok); 90 intptr_t super_check_offset = klass->super_check_offset(); 91 __ ld_ptr(Address(temp_reg, super_check_offset), temp_reg); 92 __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg); 93 __ ld_ptr(Address(temp2_reg, 0), temp2_reg); 94 __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok); 95 __ BIND(L_bad); 96 if (did_save) __ restore(); 97 __ STOP(error_message); 98 __ BIND(L_ok); 99 if (did_save) __ restore(); 100 BLOCK_COMMENT("} verify_klass"); 101 } 102 103 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) { 104 Label L; 105 BLOCK_COMMENT("verify_ref_kind {"); 106 __ lduw(Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())), temp); 107 __ srl( temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, temp); 108 __ and3(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, temp); 109 __ cmp_and_br_short(temp, ref_kind, Assembler::equal, Assembler::pt, L); 110 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal); 111 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind); 112 if (ref_kind == JVM_REF_invokeVirtual || 113 ref_kind == JVM_REF_invokeSpecial) 114 // could do this for all ref_kinds, but would explode assembly code size 115 trace_method_handle(_masm, buf); 116 __ STOP(buf); 117 } 118 BLOCK_COMMENT("} verify_ref_kind"); 119 __ bind(L); 120 } 121 122 #endif // ASSERT 123 124 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp, 125 bool for_compiler_entry) { 126 Label L_no_such_method; 127 assert(method == G5_method, "interpreter calling convention"); 128 assert_different_registers(method, target, temp); 129 130 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) { 131 Label run_compiled_code; 132 // JVMTI events, such as single-stepping, are implemented partly by avoiding running 133 // compiled code in threads for which the event is enabled. Check here for 134 // interp_only_mode if these events CAN be enabled. 135 __ verify_thread(); 136 const Address interp_only(G2_thread, JavaThread::interp_only_mode_offset()); 137 __ ld(interp_only, temp); 138 __ cmp_and_br_short(temp, 0, Assembler::zero, Assembler::pt, run_compiled_code); 139 // Null method test is replicated below in compiled case, 140 // it might be able to address across the verify_thread() 141 __ br_null_short(G5_method, Assembler::pn, L_no_such_method); 142 __ ld_ptr(G5_method, in_bytes(Method::interpreter_entry_offset()), target); 143 __ jmp(target, 0); 144 __ delayed()->nop(); 145 __ BIND(run_compiled_code); 146 // Note: we could fill some delay slots here, but 147 // it doesn't matter, since this is interpreter code. 148 } 149 150 // Compiled case, either static or fall-through from runtime conditional 151 __ br_null_short(G5_method, Assembler::pn, L_no_such_method); 152 153 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() : 154 Method::from_interpreted_offset(); 155 __ ld_ptr(G5_method, in_bytes(entry_offset), target); 156 __ jmp(target, 0); 157 __ delayed()->nop(); 158 159 __ bind(L_no_such_method); 160 AddressLiteral ame(StubRoutines::throw_AbstractMethodError_entry()); 161 __ jump_to(ame, temp); 162 __ delayed()->nop(); 163 } 164 165 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm, 166 Register recv, Register method_temp, 167 Register temp2, Register temp3, 168 bool for_compiler_entry) { 169 BLOCK_COMMENT("jump_to_lambda_form {"); 170 // This is the initial entry point of a lazy method handle. 171 // After type checking, it picks up the invoker from the LambdaForm. 172 assert_different_registers(recv, method_temp, temp2); // temp3 is only passed on 173 assert(method_temp == G5_method, "required register for loading method"); 174 175 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); }); 176 177 // Load the invoker, as MH -> MH.form -> LF.vmentry 178 __ verify_oop(recv); 179 __ load_heap_oop(Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())), method_temp); 180 __ verify_oop(method_temp); 181 __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())), method_temp); 182 __ verify_oop(method_temp); 183 // the following assumes that a Method* is normally compressed in the vmtarget field: 184 __ ld_ptr( Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())), method_temp); 185 186 if (VerifyMethodHandles && !for_compiler_entry) { 187 // make sure recv is already on stack 188 __ ld_ptr(method_temp, in_bytes(Method::const_offset()), temp2); 189 __ load_sized_value(Address(temp2, ConstMethod::size_of_parameters_offset()), 190 temp2, 191 sizeof(u2), /*is_signed*/ false); 192 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 193 Label L; 194 __ ld_ptr(__ argument_address(temp2, temp2, -1), temp2); 195 __ cmp_and_br_short(temp2, recv, Assembler::equal, Assembler::pt, L); 196 __ STOP("receiver not on stack"); 197 __ BIND(L); 198 } 199 200 jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry); 201 BLOCK_COMMENT("} jump_to_lambda_form"); 202 } 203 204 205 // Code generation 206 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm, 207 vmIntrinsics::ID iid) { 208 const bool not_for_compiler_entry = false; // this is the interpreter entry 209 assert(is_signature_polymorphic(iid), "expected invoke iid"); 210 if (iid == vmIntrinsics::_invokeGeneric || 211 iid == vmIntrinsics::_compiledLambdaForm) { 212 // Perhaps surprisingly, the symbolic references visible to Java are not directly used. 213 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod. 214 // They all allow an appendix argument. 215 __ should_not_reach_here(); // empty stubs make SG sick 216 return NULL; 217 } 218 219 // I5_savedSP/O5_savedSP: sender SP (must preserve; see prepare_to_jump_from_interpreted) 220 // G5_method: Method* 221 // G4 (Gargs): incoming argument list (must preserve) 222 // O0: used as temp to hold mh or receiver 223 // O1, O4: garbage temps, blown away 224 Register O1_scratch = O1; 225 Register O4_param_size = O4; // size of parameters 226 227 // here's where control starts out: 228 __ align(CodeEntryAlignment); 229 address entry_point = __ pc(); 230 231 if (VerifyMethodHandles) { 232 Label L; 233 BLOCK_COMMENT("verify_intrinsic_id {"); 234 __ ldub(Address(G5_method, Method::intrinsic_id_offset_in_bytes()), O1_scratch); 235 __ cmp_and_br_short(O1_scratch, (int) iid, Assembler::equal, Assembler::pt, L); 236 if (iid == vmIntrinsics::_linkToVirtual || 237 iid == vmIntrinsics::_linkToSpecial) { 238 // could do this for all kinds, but would explode assembly code size 239 trace_method_handle(_masm, "bad Method*::intrinsic_id"); 240 } 241 __ STOP("bad Method*::intrinsic_id"); 242 __ bind(L); 243 BLOCK_COMMENT("} verify_intrinsic_id"); 244 } 245 246 // First task: Find out how big the argument list is. 247 Address O4_first_arg_addr; 248 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid); 249 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic"); 250 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) { 251 __ ld_ptr(G5_method, in_bytes(Method::const_offset()), O4_param_size); 252 __ load_sized_value(Address(O4_param_size, ConstMethod::size_of_parameters_offset()), 253 O4_param_size, 254 sizeof(u2), /*is_signed*/ false); 255 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 256 O4_first_arg_addr = __ argument_address(O4_param_size, O4_param_size, -1); 257 } else { 258 DEBUG_ONLY(O4_param_size = noreg); 259 } 260 261 Register O0_mh = noreg; 262 if (!is_signature_polymorphic_static(iid)) { 263 __ ld_ptr(O4_first_arg_addr, O0_mh = O0); 264 DEBUG_ONLY(O4_param_size = noreg); 265 } 266 267 // O4_first_arg_addr is live! 268 269 if (TraceMethodHandles) { 270 if (O0_mh != noreg) 271 __ mov(O0_mh, G3_method_handle); // make stub happy 272 trace_method_handle_interpreter_entry(_masm, iid); 273 } 274 275 if (iid == vmIntrinsics::_invokeBasic) { 276 generate_method_handle_dispatch(_masm, iid, O0_mh, noreg, not_for_compiler_entry); 277 278 } else { 279 // Adjust argument list by popping the trailing MemberName argument. 280 Register O0_recv = noreg; 281 if (MethodHandles::ref_kind_has_receiver(ref_kind)) { 282 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack. 283 __ ld_ptr(O4_first_arg_addr, O0_recv = O0); 284 DEBUG_ONLY(O4_param_size = noreg); 285 } 286 Register G5_member = G5_method; // MemberName ptr; incoming method ptr is dead now 287 __ ld_ptr(__ argument_address(constant(0)), G5_member); 288 __ add(Gargs, Interpreter::stackElementSize, Gargs); 289 generate_method_handle_dispatch(_masm, iid, O0_recv, G5_member, not_for_compiler_entry); 290 } 291 292 return entry_point; 293 } 294 295 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm, 296 vmIntrinsics::ID iid, 297 Register receiver_reg, 298 Register member_reg, 299 bool for_compiler_entry) { 300 assert(is_signature_polymorphic(iid), "expected invoke iid"); 301 Register temp1 = (for_compiler_entry ? G1_scratch : O1); 302 Register temp2 = (for_compiler_entry ? G3_scratch : O2); 303 Register temp3 = (for_compiler_entry ? G4_scratch : O3); 304 Register temp4 = (for_compiler_entry ? noreg : O4); 305 if (for_compiler_entry) { 306 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : O0), "only valid assignment"); 307 assert_different_registers(temp1, O0, O1, O2, O3, O4, O5); 308 assert_different_registers(temp2, O0, O1, O2, O3, O4, O5); 309 assert_different_registers(temp3, O0, O1, O2, O3, O4, O5); 310 assert_different_registers(temp4, O0, O1, O2, O3, O4, O5); 311 } else { 312 assert_different_registers(temp1, temp2, temp3, temp4, O5_savedSP); // don't trash lastSP 313 } 314 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg); 315 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg); 316 317 if (iid == vmIntrinsics::_invokeBasic) { 318 // indirect through MH.form.vmentry.vmtarget 319 jump_to_lambda_form(_masm, receiver_reg, G5_method, temp1, temp2, for_compiler_entry); 320 321 } else { 322 // The method is a member invoker used by direct method handles. 323 if (VerifyMethodHandles) { 324 // make sure the trailing argument really is a MemberName (caller responsibility) 325 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass), 326 temp1, temp2, 327 "MemberName required for invokeVirtual etc."); 328 } 329 330 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes())); 331 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes())); 332 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())); 333 334 Register temp1_recv_klass = temp1; 335 if (iid != vmIntrinsics::_linkToStatic) { 336 __ verify_oop(receiver_reg); 337 if (iid == vmIntrinsics::_linkToSpecial) { 338 // Don't actually load the klass; just null-check the receiver. 339 __ null_check(receiver_reg); 340 } else { 341 // load receiver klass itself 342 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes()); 343 __ load_klass(receiver_reg, temp1_recv_klass); 344 __ verify_klass_ptr(temp1_recv_klass); 345 } 346 BLOCK_COMMENT("check_receiver {"); 347 // The receiver for the MemberName must be in receiver_reg. 348 // Check the receiver against the MemberName.clazz 349 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) { 350 // Did not load it above... 351 __ load_klass(receiver_reg, temp1_recv_klass); 352 __ verify_klass_ptr(temp1_recv_klass); 353 } 354 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) { 355 Label L_ok; 356 Register temp2_defc = temp2; 357 __ load_heap_oop(member_clazz, temp2_defc); 358 load_klass_from_Class(_masm, temp2_defc, temp3, temp4); 359 __ verify_klass_ptr(temp2_defc); 360 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok); 361 // If we get here, the type check failed! 362 __ STOP("receiver class disagrees with MemberName.clazz"); 363 __ bind(L_ok); 364 } 365 BLOCK_COMMENT("} check_receiver"); 366 } 367 if (iid == vmIntrinsics::_linkToSpecial || 368 iid == vmIntrinsics::_linkToStatic) { 369 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass 370 } 371 372 // Live registers at this point: 373 // member_reg - MemberName that was the trailing argument 374 // temp1_recv_klass - klass of stacked receiver, if needed 375 // O5_savedSP - interpreter linkage (if interpreted) 376 // O0..O5 - compiler arguments (if compiled) 377 378 Label L_incompatible_class_change_error; 379 switch (iid) { 380 case vmIntrinsics::_linkToSpecial: 381 if (VerifyMethodHandles) { 382 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2); 383 } 384 __ ld_ptr(member_vmtarget, G5_method); 385 break; 386 387 case vmIntrinsics::_linkToStatic: 388 if (VerifyMethodHandles) { 389 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2); 390 } 391 __ ld_ptr(member_vmtarget, G5_method); 392 break; 393 394 case vmIntrinsics::_linkToVirtual: 395 { 396 // same as TemplateTable::invokevirtual, 397 // minus the CP setup and profiling: 398 399 if (VerifyMethodHandles) { 400 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2); 401 } 402 403 // pick out the vtable index from the MemberName, and then we can discard it: 404 Register temp2_index = temp2; 405 __ ld_ptr(member_vmindex, temp2_index); 406 407 if (VerifyMethodHandles) { 408 Label L_index_ok; 409 __ cmp_and_br_short(temp2_index, (int) 0, Assembler::greaterEqual, Assembler::pn, L_index_ok); 410 __ STOP("no virtual index"); 411 __ BIND(L_index_ok); 412 } 413 414 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget 415 // at this point. And VerifyMethodHandles has already checked clazz, if needed. 416 417 // get target Method* & entry point 418 __ lookup_virtual_method(temp1_recv_klass, temp2_index, G5_method); 419 break; 420 } 421 422 case vmIntrinsics::_linkToInterface: 423 { 424 // same as TemplateTable::invokeinterface 425 // (minus the CP setup and profiling, with different argument motion) 426 if (VerifyMethodHandles) { 427 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2); 428 } 429 430 Register temp2_intf = temp2; 431 __ load_heap_oop(member_clazz, temp2_intf); 432 load_klass_from_Class(_masm, temp2_intf, temp3, temp4); 433 __ verify_klass_ptr(temp2_intf); 434 435 Register G5_index = G5_method; 436 __ ld_ptr(member_vmindex, G5_index); 437 if (VerifyMethodHandles) { 438 Label L; 439 __ cmp_and_br_short(G5_index, 0, Assembler::greaterEqual, Assembler::pt, L); 440 __ STOP("invalid vtable index for MH.invokeInterface"); 441 __ bind(L); 442 } 443 444 // given intf, index, and recv klass, dispatch to the implementation method 445 __ lookup_interface_method(temp1_recv_klass, temp2_intf, 446 // note: next two args must be the same: 447 G5_index, G5_method, 448 temp3, temp4, 449 L_incompatible_class_change_error); 450 break; 451 } 452 453 default: 454 fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid))); 455 break; 456 } 457 458 // Live at this point: 459 // G5_method 460 // O5_savedSP (if interpreted) 461 462 // After figuring out which concrete method to call, jump into it. 463 // Note that this works in the interpreter with no data motion. 464 // But the compiled version will require that rcx_recv be shifted out. 465 __ verify_method_ptr(G5_method); 466 jump_from_method_handle(_masm, G5_method, temp1, temp2, for_compiler_entry); 467 468 if (iid == vmIntrinsics::_linkToInterface) { 469 __ BIND(L_incompatible_class_change_error); 470 AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry()); 471 __ jump_to(icce, temp1); 472 __ delayed()->nop(); 473 } 474 } 475 } 476 477 #ifndef PRODUCT 478 void trace_method_handle_stub(const char* adaptername, 479 oopDesc* mh, 480 intptr_t* saved_sp, 481 intptr_t* args, 482 intptr_t* tracing_fp) { 483 bool has_mh = (strstr(adaptername, "/static") == NULL && 484 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH 485 const char* mh_reg_name = has_mh ? "G3_mh" : "G3"; 486 tty->print_cr("MH %s %s="INTPTR_FORMAT " saved_sp=" INTPTR_FORMAT " args=" INTPTR_FORMAT, 487 adaptername, mh_reg_name, 488 p2i(mh), p2i(saved_sp), p2i(args)); 489 490 if (Verbose) { 491 // dumping last frame with frame::describe 492 493 JavaThread* p = JavaThread::active(); 494 495 ResourceMark rm; 496 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here 497 FrameValues values; 498 499 // Note: We want to allow trace_method_handle from any call site. 500 // While trace_method_handle creates a frame, it may be entered 501 // without a valid return PC in O7 (e.g. not just after a call). 502 // Walking that frame could lead to failures due to that invalid PC. 503 // => carefully detect that frame when doing the stack walking 504 505 // walk up to the right frame using the "tracing_fp" argument 506 intptr_t* cur_sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); 507 frame cur_frame(cur_sp, frame::unpatchable, NULL); 508 509 while (cur_frame.fp() != (intptr_t *)(STACK_BIAS+(uintptr_t)tracing_fp)) { 510 cur_frame = os::get_sender_for_C_frame(&cur_frame); 511 } 512 513 // safely create a frame and call frame::describe 514 intptr_t *dump_sp = cur_frame.sender_sp(); 515 intptr_t *dump_fp = cur_frame.link(); 516 517 bool walkable = has_mh; // whether the traced frame shoud be walkable 518 519 // the sender for cur_frame is the caller of trace_method_handle 520 if (walkable) { 521 // The previous definition of walkable may have to be refined 522 // if new call sites cause the next frame constructor to start 523 // failing. Alternatively, frame constructors could be 524 // modified to support the current or future non walkable 525 // frames (but this is more intrusive and is not considered as 526 // part of this RFE, which will instead use a simpler output). 527 frame dump_frame = frame(dump_sp, 528 cur_frame.sp(), // younger_sp 529 false); // no adaptation 530 dump_frame.describe(values, 1); 531 } else { 532 // Robust dump for frames which cannot be constructed from sp/younger_sp 533 // Add descriptions without building a Java frame to avoid issues 534 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>"); 535 values.describe(-1, dump_sp, "sp"); 536 } 537 538 bool has_args = has_mh; // whether Gargs is meaningful 539 540 // mark args, if seems valid (may not be valid for some adapters) 541 if (has_args) { 542 if ((args >= dump_sp) && (args < dump_fp)) { 543 values.describe(-1, args, "*G4_args"); 544 } 545 } 546 547 // mark saved_sp, if seems valid (may not be valid for some adapters) 548 intptr_t *unbiased_sp = (intptr_t *)(STACK_BIAS+(uintptr_t)saved_sp); 549 const int ARG_LIMIT = 255, SLOP = 45, UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP); 550 if ((unbiased_sp >= dump_sp - UNREASONABLE_STACK_MOVE) && (unbiased_sp < dump_fp)) { 551 values.describe(-1, unbiased_sp, "*saved_sp+STACK_BIAS"); 552 } 553 554 // Note: the unextended_sp may not be correct 555 tty->print_cr(" stack layout:"); 556 values.print(p); 557 if (has_mh && mh->is_oop()) { 558 mh->print(); 559 if (java_lang_invoke_MethodHandle::is_instance(mh)) { 560 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0) 561 java_lang_invoke_MethodHandle::form(mh)->print(); 562 } 563 } 564 } 565 } 566 567 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { 568 if (!TraceMethodHandles) return; 569 BLOCK_COMMENT("trace_method_handle {"); 570 // save: Gargs, O5_savedSP 571 __ save_frame(16); // need space for saving required FPU state 572 573 __ set((intptr_t) adaptername, O0); 574 __ mov(G3_method_handle, O1); 575 __ mov(I5_savedSP, O2); 576 __ mov(Gargs, O3); 577 __ mov(I6, O4); // frame identifier for safe stack walking 578 579 // Save scratched registers that might be needed. Robustness is more 580 // important than optimizing the saves for this debug only code. 581 582 // save FP result, valid at some call sites (adapter_opt_return_float, ...) 583 Address d_save(FP, -sizeof(jdouble) + STACK_BIAS); 584 __ stf(FloatRegisterImpl::D, Ftos_d, d_save); 585 // Safely save all globals but G2 (handled by call_VM_leaf) and G7 586 // (OS reserved). 587 __ mov(G3_method_handle, L3); 588 __ mov(Gargs, L4); 589 __ mov(G5_method_type, L5); 590 __ mov(G6, L6); 591 __ mov(G1, L1); 592 593 __ call_VM_leaf(L2 /* for G2 */, CAST_FROM_FN_PTR(address, trace_method_handle_stub)); 594 595 __ mov(L3, G3_method_handle); 596 __ mov(L4, Gargs); 597 __ mov(L5, G5_method_type); 598 __ mov(L6, G6); 599 __ mov(L1, G1); 600 __ ldf(FloatRegisterImpl::D, d_save, Ftos_d); 601 602 __ restore(); 603 BLOCK_COMMENT("} trace_method_handle"); 604 } 605 #endif // PRODUCT