1 /* 2 * Copyright (c) 2008, 2017, 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 "memory/resourceArea.hpp" 32 #include "prims/jvm.h" 33 #include "prims/methodHandles.hpp" 34 35 #define __ _masm-> 36 37 #ifdef PRODUCT 38 #define BLOCK_COMMENT(str) /* nothing */ 39 #define STOP(error) stop(error) 40 #else 41 #define BLOCK_COMMENT(str) __ block_comment(str) 42 #define STOP(error) block_comment(error); __ stop(error) 43 #endif 44 45 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") 46 47 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant. 48 static RegisterOrConstant constant(int value) { 49 return RegisterOrConstant(value); 50 } 51 52 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp_reg, Register temp2_reg) { 53 if (VerifyMethodHandles) 54 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), temp_reg, temp2_reg, 55 "MH argument is a Class"); 56 __ ld_ptr(Address(klass_reg, java_lang_Class::klass_offset_in_bytes()), klass_reg); 57 } 58 59 #ifdef ASSERT 60 static int check_nonzero(const char* xname, int x) { 61 assert(x != 0, "%s should be nonzero", xname); 62 return x; 63 } 64 #define NONZERO(x) check_nonzero(#x, x) 65 #else //ASSERT 66 #define NONZERO(x) (x) 67 #endif //ASSERT 68 69 #ifdef ASSERT 70 void MethodHandles::verify_klass(MacroAssembler* _masm, 71 Register obj_reg, SystemDictionary::WKID klass_id, 72 Register temp_reg, Register temp2_reg, 73 const char* error_message) { 74 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id); 75 Klass* klass = SystemDictionary::well_known_klass(klass_id); 76 bool did_save = false; 77 if (temp_reg == noreg || temp2_reg == noreg) { 78 temp_reg = L1; 79 temp2_reg = L2; 80 __ save_frame_and_mov(0, obj_reg, L0); 81 obj_reg = L0; 82 did_save = true; 83 } 84 Label L_ok, L_bad; 85 BLOCK_COMMENT("verify_klass {"); 86 __ verify_oop(obj_reg); 87 __ br_null_short(obj_reg, Assembler::pn, L_bad); 88 __ load_klass(obj_reg, temp_reg); 89 __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg); 90 __ ld_ptr(Address(temp2_reg, 0), temp2_reg); 91 __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok); 92 intptr_t super_check_offset = klass->super_check_offset(); 93 __ ld_ptr(Address(temp_reg, super_check_offset), temp_reg); 94 __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg); 95 __ ld_ptr(Address(temp2_reg, 0), temp2_reg); 96 __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok); 97 __ BIND(L_bad); 98 if (did_save) __ restore(); 99 __ STOP(error_message); 100 __ BIND(L_ok); 101 if (did_save) __ restore(); 102 BLOCK_COMMENT("} verify_klass"); 103 } 104 105 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) { 106 Label L; 107 BLOCK_COMMENT("verify_ref_kind {"); 108 __ lduw(Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())), temp); 109 __ srl( temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, temp); 110 __ and3(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, temp); 111 __ cmp_and_br_short(temp, ref_kind, Assembler::equal, Assembler::pt, L); 112 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal); 113 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind); 114 if (ref_kind == JVM_REF_invokeVirtual || 115 ref_kind == JVM_REF_invokeSpecial) 116 // could do this for all ref_kinds, but would explode assembly code size 117 trace_method_handle(_masm, buf); 118 __ STOP(buf); 119 } 120 BLOCK_COMMENT("} verify_ref_kind"); 121 __ bind(L); 122 } 123 124 #endif // ASSERT 125 126 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp, 127 bool for_compiler_entry) { 128 Label L_no_such_method; 129 assert(method == G5_method, "interpreter calling convention"); 130 assert_different_registers(method, target, temp); 131 132 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) { 133 Label run_compiled_code; 134 // JVMTI events, such as single-stepping, are implemented partly by avoiding running 135 // compiled code in threads for which the event is enabled. Check here for 136 // interp_only_mode if these events CAN be enabled. 137 __ verify_thread(); 138 const Address interp_only(G2_thread, JavaThread::interp_only_mode_offset()); 139 __ ld(interp_only, temp); 140 __ cmp_and_br_short(temp, 0, Assembler::zero, Assembler::pt, run_compiled_code); 141 // Null method test is replicated below in compiled case, 142 // it might be able to address across the verify_thread() 143 __ br_null_short(G5_method, Assembler::pn, L_no_such_method); 144 __ ld_ptr(G5_method, in_bytes(Method::interpreter_entry_offset()), target); 145 __ jmp(target, 0); 146 __ delayed()->nop(); 147 __ BIND(run_compiled_code); 148 // Note: we could fill some delay slots here, but 149 // it doesn't matter, since this is interpreter code. 150 } 151 152 // Compiled case, either static or fall-through from runtime conditional 153 __ br_null_short(G5_method, Assembler::pn, L_no_such_method); 154 155 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() : 156 Method::from_interpreted_offset(); 157 __ ld_ptr(G5_method, in_bytes(entry_offset), target); 158 __ jmp(target, 0); 159 __ delayed()->nop(); 160 161 __ bind(L_no_such_method); 162 AddressLiteral ame(StubRoutines::throw_AbstractMethodError_entry()); 163 __ jump_to(ame, temp); 164 __ delayed()->nop(); 165 } 166 167 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm, 168 Register recv, Register method_temp, 169 Register temp2, Register temp3, 170 bool for_compiler_entry) { 171 BLOCK_COMMENT("jump_to_lambda_form {"); 172 // This is the initial entry point of a lazy method handle. 173 // After type checking, it picks up the invoker from the LambdaForm. 174 assert_different_registers(recv, method_temp, temp2); // temp3 is only passed on 175 assert(method_temp == G5_method, "required register for loading method"); 176 177 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); }); 178 179 // Load the invoker, as MH -> MH.form -> LF.vmentry 180 __ verify_oop(recv); 181 __ load_heap_oop(Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())), method_temp); 182 __ verify_oop(method_temp); 183 __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())), method_temp); 184 __ verify_oop(method_temp); 185 __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())), method_temp); 186 __ verify_oop(method_temp); 187 __ ld_ptr( Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())), method_temp); 188 189 if (VerifyMethodHandles && !for_compiler_entry) { 190 // make sure recv is already on stack 191 __ ld_ptr(method_temp, in_bytes(Method::const_offset()), temp2); 192 __ load_sized_value(Address(temp2, ConstMethod::size_of_parameters_offset()), 193 temp2, 194 sizeof(u2), /*is_signed*/ false); 195 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 196 Label L; 197 __ ld_ptr(__ argument_address(temp2, temp2, -1), temp2); 198 __ cmp_and_br_short(temp2, recv, Assembler::equal, Assembler::pt, L); 199 __ STOP("receiver not on stack"); 200 __ BIND(L); 201 } 202 203 jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry); 204 BLOCK_COMMENT("} jump_to_lambda_form"); 205 } 206 207 208 // Code generation 209 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm, 210 vmIntrinsics::ID iid) { 211 const bool not_for_compiler_entry = false; // this is the interpreter entry 212 assert(is_signature_polymorphic(iid), "expected invoke iid"); 213 if (iid == vmIntrinsics::_invokeGeneric || 214 iid == vmIntrinsics::_compiledLambdaForm) { 215 // Perhaps surprisingly, the symbolic references visible to Java are not directly used. 216 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod. 217 // They all allow an appendix argument. 218 __ should_not_reach_here(); // empty stubs make SG sick 219 return NULL; 220 } 221 222 // I5_savedSP/O5_savedSP: sender SP (must preserve; see prepare_to_jump_from_interpreted) 223 // G5_method: Method* 224 // G4 (Gargs): incoming argument list (must preserve) 225 // O0: used as temp to hold mh or receiver 226 // O1, O4: garbage temps, blown away 227 Register O1_scratch = O1; 228 Register O4_param_size = O4; // size of parameters 229 230 // here's where control starts out: 231 __ align(CodeEntryAlignment); 232 address entry_point = __ pc(); 233 234 if (VerifyMethodHandles) { 235 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2"); 236 237 Label L; 238 BLOCK_COMMENT("verify_intrinsic_id {"); 239 __ lduh(Address(G5_method, Method::intrinsic_id_offset_in_bytes()), O1_scratch); 240 __ cmp_and_br_short(O1_scratch, (int) iid, Assembler::equal, Assembler::pt, L); 241 if (iid == vmIntrinsics::_linkToVirtual || 242 iid == vmIntrinsics::_linkToSpecial) { 243 // could do this for all kinds, but would explode assembly code size 244 trace_method_handle(_masm, "bad Method*::intrinsic_id"); 245 } 246 __ STOP("bad Method*::intrinsic_id"); 247 __ bind(L); 248 BLOCK_COMMENT("} verify_intrinsic_id"); 249 } 250 251 // First task: Find out how big the argument list is. 252 Address O4_first_arg_addr; 253 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid); 254 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic"); 255 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) { 256 __ ld_ptr(G5_method, in_bytes(Method::const_offset()), O4_param_size); 257 __ load_sized_value(Address(O4_param_size, ConstMethod::size_of_parameters_offset()), 258 O4_param_size, 259 sizeof(u2), /*is_signed*/ false); 260 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 261 O4_first_arg_addr = __ argument_address(O4_param_size, O4_param_size, -1); 262 } else { 263 DEBUG_ONLY(O4_param_size = noreg); 264 } 265 266 Register O0_mh = noreg; 267 if (!is_signature_polymorphic_static(iid)) { 268 __ ld_ptr(O4_first_arg_addr, O0_mh = O0); 269 DEBUG_ONLY(O4_param_size = noreg); 270 } 271 272 // O4_first_arg_addr is live! 273 274 if (TraceMethodHandles) { 275 if (O0_mh != noreg) 276 __ mov(O0_mh, G3_method_handle); // make stub happy 277 trace_method_handle_interpreter_entry(_masm, iid); 278 } 279 280 if (iid == vmIntrinsics::_invokeBasic) { 281 generate_method_handle_dispatch(_masm, iid, O0_mh, noreg, not_for_compiler_entry); 282 283 } else { 284 // Adjust argument list by popping the trailing MemberName argument. 285 Register O0_recv = noreg; 286 if (MethodHandles::ref_kind_has_receiver(ref_kind)) { 287 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack. 288 __ ld_ptr(O4_first_arg_addr, O0_recv = O0); 289 DEBUG_ONLY(O4_param_size = noreg); 290 } 291 Register G5_member = G5_method; // MemberName ptr; incoming method ptr is dead now 292 __ ld_ptr(__ argument_address(constant(0)), G5_member); 293 __ add(Gargs, Interpreter::stackElementSize, Gargs); 294 generate_method_handle_dispatch(_masm, iid, O0_recv, G5_member, not_for_compiler_entry); 295 } 296 297 return entry_point; 298 } 299 300 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm, 301 vmIntrinsics::ID iid, 302 Register receiver_reg, 303 Register member_reg, 304 bool for_compiler_entry) { 305 assert(is_signature_polymorphic(iid), "expected invoke iid"); 306 Register temp1 = (for_compiler_entry ? G1_scratch : O1); 307 Register temp2 = (for_compiler_entry ? G3_scratch : O2); 308 Register temp3 = (for_compiler_entry ? G4_scratch : O3); 309 Register temp4 = (for_compiler_entry ? noreg : O4); 310 if (for_compiler_entry) { 311 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : O0), "only valid assignment"); 312 assert_different_registers(temp1, O0, O1, O2, O3, O4, O5); 313 assert_different_registers(temp2, O0, O1, O2, O3, O4, O5); 314 assert_different_registers(temp3, O0, O1, O2, O3, O4, O5); 315 assert_different_registers(temp4, O0, O1, O2, O3, O4, O5); 316 } else { 317 assert_different_registers(temp1, temp2, temp3, temp4, O5_savedSP); // don't trash lastSP 318 } 319 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg); 320 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg); 321 322 if (iid == vmIntrinsics::_invokeBasic) { 323 // indirect through MH.form.vmentry.vmtarget 324 jump_to_lambda_form(_masm, receiver_reg, G5_method, temp1, temp2, for_compiler_entry); 325 326 } else { 327 // The method is a member invoker used by direct method handles. 328 if (VerifyMethodHandles) { 329 // make sure the trailing argument really is a MemberName (caller responsibility) 330 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass), 331 temp1, temp2, 332 "MemberName required for invokeVirtual etc."); 333 } 334 335 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes())); 336 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes())); 337 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())); 338 Address vmtarget_method( G5_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())); 339 340 Register temp1_recv_klass = temp1; 341 if (iid != vmIntrinsics::_linkToStatic) { 342 __ verify_oop(receiver_reg); 343 if (iid == vmIntrinsics::_linkToSpecial) { 344 // Don't actually load the klass; just null-check the receiver. 345 __ null_check(receiver_reg); 346 } else { 347 // load receiver klass itself 348 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes()); 349 __ load_klass(receiver_reg, temp1_recv_klass); 350 __ verify_klass_ptr(temp1_recv_klass); 351 } 352 BLOCK_COMMENT("check_receiver {"); 353 // The receiver for the MemberName must be in receiver_reg. 354 // Check the receiver against the MemberName.clazz 355 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) { 356 // Did not load it above... 357 __ load_klass(receiver_reg, temp1_recv_klass); 358 __ verify_klass_ptr(temp1_recv_klass); 359 } 360 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) { 361 Label L_ok; 362 Register temp2_defc = temp2; 363 __ load_heap_oop(member_clazz, temp2_defc); 364 load_klass_from_Class(_masm, temp2_defc, temp3, temp4); 365 __ verify_klass_ptr(temp2_defc); 366 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok); 367 // If we get here, the type check failed! 368 __ STOP("receiver class disagrees with MemberName.clazz"); 369 __ bind(L_ok); 370 } 371 BLOCK_COMMENT("} check_receiver"); 372 } 373 if (iid == vmIntrinsics::_linkToSpecial || 374 iid == vmIntrinsics::_linkToStatic) { 375 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass 376 } 377 378 // Live registers at this point: 379 // member_reg - MemberName that was the trailing argument 380 // temp1_recv_klass - klass of stacked receiver, if needed 381 // O5_savedSP - interpreter linkage (if interpreted) 382 // O0..O5 - compiler arguments (if compiled) 383 384 Label L_incompatible_class_change_error; 385 switch (iid) { 386 case vmIntrinsics::_linkToSpecial: 387 if (VerifyMethodHandles) { 388 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2); 389 } 390 __ load_heap_oop(member_vmtarget, G5_method); 391 __ ld_ptr(vmtarget_method, G5_method); 392 break; 393 394 case vmIntrinsics::_linkToStatic: 395 if (VerifyMethodHandles) { 396 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2); 397 } 398 __ load_heap_oop(member_vmtarget, G5_method); 399 __ ld_ptr(vmtarget_method, G5_method); 400 break; 401 402 case vmIntrinsics::_linkToVirtual: 403 { 404 // same as TemplateTable::invokevirtual, 405 // minus the CP setup and profiling: 406 407 if (VerifyMethodHandles) { 408 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2); 409 } 410 411 // pick out the vtable index from the MemberName, and then we can discard it: 412 Register temp2_index = temp2; 413 __ ld_ptr(member_vmindex, temp2_index); 414 415 if (VerifyMethodHandles) { 416 Label L_index_ok; 417 __ cmp_and_br_short(temp2_index, (int) 0, Assembler::greaterEqual, Assembler::pn, L_index_ok); 418 __ STOP("no virtual index"); 419 __ BIND(L_index_ok); 420 } 421 422 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget 423 // at this point. And VerifyMethodHandles has already checked clazz, if needed. 424 425 // get target Method* & entry point 426 __ lookup_virtual_method(temp1_recv_klass, temp2_index, G5_method); 427 break; 428 } 429 430 case vmIntrinsics::_linkToInterface: 431 { 432 // same as TemplateTable::invokeinterface 433 // (minus the CP setup and profiling, with different argument motion) 434 if (VerifyMethodHandles) { 435 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2); 436 } 437 438 Register temp2_intf = temp2; 439 __ load_heap_oop(member_clazz, temp2_intf); 440 load_klass_from_Class(_masm, temp2_intf, temp3, temp4); 441 __ verify_klass_ptr(temp2_intf); 442 443 Register G5_index = G5_method; 444 __ ld_ptr(member_vmindex, G5_index); 445 if (VerifyMethodHandles) { 446 Label L; 447 __ cmp_and_br_short(G5_index, 0, Assembler::greaterEqual, Assembler::pt, L); 448 __ STOP("invalid vtable index for MH.invokeInterface"); 449 __ bind(L); 450 } 451 452 // given intf, index, and recv klass, dispatch to the implementation method 453 __ lookup_interface_method(temp1_recv_klass, temp2_intf, 454 // note: next two args must be the same: 455 G5_index, G5_method, 456 temp3, temp4, 457 L_incompatible_class_change_error); 458 break; 459 } 460 461 default: 462 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)); 463 break; 464 } 465 466 // Live at this point: 467 // G5_method 468 // O5_savedSP (if interpreted) 469 470 // After figuring out which concrete method to call, jump into it. 471 // Note that this works in the interpreter with no data motion. 472 // But the compiled version will require that rcx_recv be shifted out. 473 __ verify_method_ptr(G5_method); 474 jump_from_method_handle(_masm, G5_method, temp1, temp2, for_compiler_entry); 475 476 if (iid == vmIntrinsics::_linkToInterface) { 477 __ BIND(L_incompatible_class_change_error); 478 AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry()); 479 __ jump_to(icce, temp1); 480 __ delayed()->nop(); 481 } 482 } 483 } 484 485 #ifndef PRODUCT 486 void trace_method_handle_stub(const char* adaptername, 487 oopDesc* mh, 488 intptr_t* saved_sp, 489 intptr_t* args, 490 intptr_t* tracing_fp) { 491 bool has_mh = (strstr(adaptername, "/static") == NULL && 492 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH 493 const char* mh_reg_name = has_mh ? "G3_mh" : "G3"; 494 tty->print_cr("MH %s %s=" INTPTR_FORMAT " saved_sp=" INTPTR_FORMAT " args=" INTPTR_FORMAT, 495 adaptername, mh_reg_name, 496 p2i(mh), p2i(saved_sp), p2i(args)); 497 498 if (Verbose) { 499 // dumping last frame with frame::describe 500 501 JavaThread* p = JavaThread::active(); 502 503 ResourceMark rm; 504 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here 505 FrameValues values; 506 507 // Note: We want to allow trace_method_handle from any call site. 508 // While trace_method_handle creates a frame, it may be entered 509 // without a valid return PC in O7 (e.g. not just after a call). 510 // Walking that frame could lead to failures due to that invalid PC. 511 // => carefully detect that frame when doing the stack walking 512 513 // walk up to the right frame using the "tracing_fp" argument 514 intptr_t* cur_sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); 515 frame cur_frame(cur_sp, frame::unpatchable, NULL); 516 517 while (cur_frame.fp() != (intptr_t *)(STACK_BIAS+(uintptr_t)tracing_fp)) { 518 cur_frame = os::get_sender_for_C_frame(&cur_frame); 519 } 520 521 // safely create a frame and call frame::describe 522 intptr_t *dump_sp = cur_frame.sender_sp(); 523 intptr_t *dump_fp = cur_frame.link(); 524 525 bool walkable = has_mh; // whether the traced frame shoud be walkable 526 527 // the sender for cur_frame is the caller of trace_method_handle 528 if (walkable) { 529 // The previous definition of walkable may have to be refined 530 // if new call sites cause the next frame constructor to start 531 // failing. Alternatively, frame constructors could be 532 // modified to support the current or future non walkable 533 // frames (but this is more intrusive and is not considered as 534 // part of this RFE, which will instead use a simpler output). 535 frame dump_frame = frame(dump_sp, 536 cur_frame.sp(), // younger_sp 537 false); // no adaptation 538 dump_frame.describe(values, 1); 539 } else { 540 // Robust dump for frames which cannot be constructed from sp/younger_sp 541 // Add descriptions without building a Java frame to avoid issues 542 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>"); 543 values.describe(-1, dump_sp, "sp"); 544 } 545 546 bool has_args = has_mh; // whether Gargs is meaningful 547 548 // mark args, if seems valid (may not be valid for some adapters) 549 if (has_args) { 550 if ((args >= dump_sp) && (args < dump_fp)) { 551 values.describe(-1, args, "*G4_args"); 552 } 553 } 554 555 // mark saved_sp, if seems valid (may not be valid for some adapters) 556 intptr_t *unbiased_sp = (intptr_t *)(STACK_BIAS+(uintptr_t)saved_sp); 557 const int ARG_LIMIT = 255, SLOP = 45, UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP); 558 if ((unbiased_sp >= dump_sp - UNREASONABLE_STACK_MOVE) && (unbiased_sp < dump_fp)) { 559 values.describe(-1, unbiased_sp, "*saved_sp+STACK_BIAS"); 560 } 561 562 // Note: the unextended_sp may not be correct 563 tty->print_cr(" stack layout:"); 564 values.print(p); 565 if (has_mh && mh->is_oop()) { 566 mh->print(); 567 if (java_lang_invoke_MethodHandle::is_instance(mh)) { 568 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0) 569 java_lang_invoke_MethodHandle::form(mh)->print(); 570 } 571 } 572 } 573 } 574 575 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { 576 if (!TraceMethodHandles) return; 577 BLOCK_COMMENT("trace_method_handle {"); 578 // save: Gargs, O5_savedSP 579 __ save_frame(16); // need space for saving required FPU state 580 581 __ set((intptr_t) adaptername, O0); 582 __ mov(G3_method_handle, O1); 583 __ mov(I5_savedSP, O2); 584 __ mov(Gargs, O3); 585 __ mov(I6, O4); // frame identifier for safe stack walking 586 587 // Save scratched registers that might be needed. Robustness is more 588 // important than optimizing the saves for this debug only code. 589 590 // save FP result, valid at some call sites (adapter_opt_return_float, ...) 591 Address d_save(FP, -sizeof(jdouble) + STACK_BIAS); 592 __ stf(FloatRegisterImpl::D, Ftos_d, d_save); 593 // Safely save all globals but G2 (handled by call_VM_leaf) and G7 594 // (OS reserved). 595 __ mov(G3_method_handle, L3); 596 __ mov(Gargs, L4); 597 __ mov(G5_method_type, L5); 598 __ mov(G6, L6); 599 __ mov(G1, L1); 600 601 __ call_VM_leaf(L2 /* for G2 */, CAST_FROM_FN_PTR(address, trace_method_handle_stub)); 602 603 __ mov(L3, G3_method_handle); 604 __ mov(L4, Gargs); 605 __ mov(L5, G5_method_type); 606 __ mov(L6, G6); 607 __ mov(L1, G1); 608 __ ldf(FloatRegisterImpl::D, d_save, Ftos_d); 609 610 __ restore(); 611 BLOCK_COMMENT("} trace_method_handle"); 612 } 613 #endif // PRODUCT