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 "jvm.h" 27 #include "asm/macroAssembler.hpp" 28 #include "classfile/javaClasses.inline.hpp" 29 #include "interpreter/interpreter.hpp" 30 #include "interpreter/interp_masm.hpp" 31 #include "memory/allocation.inline.hpp" 32 #include "memory/resourceArea.hpp" 33 #include "prims/methodHandles.hpp" 34 #include "runtime/frame.inline.hpp" 35 #include "utilities/preserveException.hpp" 36 37 #define __ _masm-> 38 39 #ifdef PRODUCT 40 #define BLOCK_COMMENT(str) /* nothing */ 41 #define STOP(error) stop(error) 42 #else 43 #define BLOCK_COMMENT(str) __ block_comment(str) 44 #define STOP(error) block_comment(error); __ stop(error) 45 #endif 46 47 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") 48 49 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant. 50 static RegisterOrConstant constant(int value) { 51 return RegisterOrConstant(value); 52 } 53 54 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp_reg, Register temp2_reg) { 55 if (VerifyMethodHandles) 56 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), temp_reg, temp2_reg, 57 "MH argument is a Class"); 58 __ ld_ptr(Address(klass_reg, java_lang_Class::klass_offset_in_bytes()), klass_reg); 59 } 60 61 #ifdef ASSERT 62 static int check_nonzero(const char* xname, int x) { 63 assert(x != 0, "%s should be nonzero", xname); 64 return x; 65 } 66 #define NONZERO(x) check_nonzero(#x, x) 67 #else //ASSERT 68 #define NONZERO(x) (x) 69 #endif //ASSERT 70 71 #ifdef ASSERT 72 void MethodHandles::verify_klass(MacroAssembler* _masm, 73 Register obj_reg, SystemDictionary::WKID klass_id, 74 Register temp_reg, Register temp2_reg, 75 const char* error_message) { 76 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id); 77 Klass* klass = SystemDictionary::well_known_klass(klass_id); 78 bool did_save = false; 79 if (temp_reg == noreg || temp2_reg == noreg) { 80 temp_reg = L1; 81 temp2_reg = L2; 82 __ save_frame_and_mov(0, obj_reg, L0); 83 obj_reg = L0; 84 did_save = true; 85 } 86 Label L_ok, L_bad; 87 BLOCK_COMMENT("verify_klass {"); 88 __ verify_oop(obj_reg); 89 __ br_null_short(obj_reg, Assembler::pn, L_bad); 90 __ load_klass(obj_reg, temp_reg); 91 __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg); 92 __ ld_ptr(Address(temp2_reg, 0), temp2_reg); 93 __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok); 94 intptr_t super_check_offset = klass->super_check_offset(); 95 __ ld_ptr(Address(temp_reg, super_check_offset), temp_reg); 96 __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg); 97 __ ld_ptr(Address(temp2_reg, 0), temp2_reg); 98 __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok); 99 __ BIND(L_bad); 100 if (did_save) __ restore(); 101 __ STOP(error_message); 102 __ BIND(L_ok); 103 if (did_save) __ restore(); 104 BLOCK_COMMENT("} verify_klass"); 105 } 106 107 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) { 108 Label L; 109 BLOCK_COMMENT("verify_ref_kind {"); 110 __ lduw(Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())), temp); 111 __ srl( temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, temp); 112 __ and3(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, temp); 113 __ cmp_and_br_short(temp, ref_kind, Assembler::equal, Assembler::pt, L); 114 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal); 115 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind); 116 if (ref_kind == JVM_REF_invokeVirtual || 117 ref_kind == JVM_REF_invokeSpecial) 118 // could do this for all ref_kinds, but would explode assembly code size 119 trace_method_handle(_masm, buf); 120 __ STOP(buf); 121 } 122 BLOCK_COMMENT("} verify_ref_kind"); 123 __ bind(L); 124 } 125 126 #endif // ASSERT 127 128 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp, 129 bool for_compiler_entry) { 130 Label L_no_such_method; 131 assert(method == G5_method, "interpreter calling convention"); 132 assert_different_registers(method, target, temp); 133 134 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) { 135 Label run_compiled_code; 136 // JVMTI events, such as single-stepping, are implemented partly by avoiding running 137 // compiled code in threads for which the event is enabled. Check here for 138 // interp_only_mode if these events CAN be enabled. 139 __ verify_thread(); 140 const Address interp_only(G2_thread, JavaThread::interp_only_mode_offset()); 141 __ ld(interp_only, temp); 142 __ cmp_and_br_short(temp, 0, Assembler::zero, Assembler::pt, run_compiled_code); 143 // Null method test is replicated below in compiled case, 144 // it might be able to address across the verify_thread() 145 __ br_null_short(G5_method, Assembler::pn, L_no_such_method); 146 __ ld_ptr(G5_method, in_bytes(Method::interpreter_entry_offset()), target); 147 __ jmp(target, 0); 148 __ delayed()->nop(); 149 __ BIND(run_compiled_code); 150 // Note: we could fill some delay slots here, but 151 // it doesn't matter, since this is interpreter code. 152 } 153 154 // Compiled case, either static or fall-through from runtime conditional 155 __ br_null_short(G5_method, Assembler::pn, L_no_such_method); 156 157 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() : 158 Method::from_interpreted_offset(); 159 __ ld_ptr(G5_method, in_bytes(entry_offset), target); 160 __ jmp(target, 0); 161 __ delayed()->nop(); 162 163 __ bind(L_no_such_method); 164 AddressLiteral ame(StubRoutines::throw_AbstractMethodError_entry()); 165 __ jump_to(ame, temp); 166 __ delayed()->nop(); 167 } 168 169 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm, 170 Register recv, Register method_temp, 171 Register temp2, Register temp3, 172 bool for_compiler_entry) { 173 BLOCK_COMMENT("jump_to_lambda_form {"); 174 // This is the initial entry point of a lazy method handle. 175 // After type checking, it picks up the invoker from the LambdaForm. 176 assert_different_registers(recv, method_temp, temp2); // temp3 is only passed on 177 assert(method_temp == G5_method, "required register for loading method"); 178 179 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); }); 180 181 // Load the invoker, as MH -> MH.form -> LF.vmentry 182 __ verify_oop(recv); 183 __ load_heap_oop(Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())), method_temp); 184 __ verify_oop(method_temp); 185 __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())), method_temp); 186 __ verify_oop(method_temp); 187 __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())), method_temp); 188 __ verify_oop(method_temp); 189 __ ld_ptr( Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())), method_temp); 190 191 if (VerifyMethodHandles && !for_compiler_entry) { 192 // make sure recv is already on stack 193 __ ld_ptr(method_temp, in_bytes(Method::const_offset()), temp2); 194 __ load_sized_value(Address(temp2, ConstMethod::size_of_parameters_offset()), 195 temp2, 196 sizeof(u2), /*is_signed*/ false); 197 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 198 Label L; 199 __ ld_ptr(__ argument_address(temp2, temp2, -1), temp2); 200 __ cmp_and_br_short(temp2, recv, Assembler::equal, Assembler::pt, L); 201 __ STOP("receiver not on stack"); 202 __ BIND(L); 203 } 204 205 jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry); 206 BLOCK_COMMENT("} jump_to_lambda_form"); 207 } 208 209 210 // Code generation 211 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm, 212 vmIntrinsics::ID iid) { 213 const bool not_for_compiler_entry = false; // this is the interpreter entry 214 assert(is_signature_polymorphic(iid), "expected invoke iid"); 215 if (iid == vmIntrinsics::_invokeGeneric || 216 iid == vmIntrinsics::_compiledLambdaForm) { 217 // Perhaps surprisingly, the symbolic references visible to Java are not directly used. 218 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod. 219 // They all allow an appendix argument. 220 __ should_not_reach_here(); // empty stubs make SG sick 221 return NULL; 222 } 223 224 // I5_savedSP/O5_savedSP: sender SP (must preserve; see prepare_to_jump_from_interpreted) 225 // G5_method: Method* 226 // G4 (Gargs): incoming argument list (must preserve) 227 // O0: used as temp to hold mh or receiver 228 // O1, O4: garbage temps, blown away 229 Register O1_scratch = O1; 230 Register O4_param_size = O4; // size of parameters 231 232 // here's where control starts out: 233 __ align(CodeEntryAlignment); 234 address entry_point = __ pc(); 235 236 if (VerifyMethodHandles) { 237 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2"); 238 239 Label L; 240 BLOCK_COMMENT("verify_intrinsic_id {"); 241 __ lduh(Address(G5_method, Method::intrinsic_id_offset_in_bytes()), O1_scratch); 242 __ cmp_and_br_short(O1_scratch, (int) iid, Assembler::equal, Assembler::pt, L); 243 if (iid == vmIntrinsics::_linkToVirtual || 244 iid == vmIntrinsics::_linkToSpecial) { 245 // could do this for all kinds, but would explode assembly code size 246 trace_method_handle(_masm, "bad Method*::intrinsic_id"); 247 } 248 __ STOP("bad Method*::intrinsic_id"); 249 __ bind(L); 250 BLOCK_COMMENT("} verify_intrinsic_id"); 251 } 252 253 // First task: Find out how big the argument list is. 254 Address O4_first_arg_addr; 255 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid); 256 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic"); 257 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) { 258 __ ld_ptr(G5_method, in_bytes(Method::const_offset()), O4_param_size); 259 __ load_sized_value(Address(O4_param_size, ConstMethod::size_of_parameters_offset()), 260 O4_param_size, 261 sizeof(u2), /*is_signed*/ false); 262 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 263 O4_first_arg_addr = __ argument_address(O4_param_size, O4_param_size, -1); 264 } else { 265 DEBUG_ONLY(O4_param_size = noreg); 266 } 267 268 Register O0_mh = noreg; 269 if (!is_signature_polymorphic_static(iid)) { 270 __ ld_ptr(O4_first_arg_addr, O0_mh = O0); 271 DEBUG_ONLY(O4_param_size = noreg); 272 } 273 274 // O4_first_arg_addr is live! 275 276 if (TraceMethodHandles) { 277 if (O0_mh != noreg) 278 __ mov(O0_mh, G3_method_handle); // make stub happy 279 trace_method_handle_interpreter_entry(_masm, iid); 280 } 281 282 if (iid == vmIntrinsics::_invokeBasic) { 283 generate_method_handle_dispatch(_masm, iid, O0_mh, noreg, not_for_compiler_entry); 284 285 } else { 286 // Adjust argument list by popping the trailing MemberName argument. 287 Register O0_recv = noreg; 288 if (MethodHandles::ref_kind_has_receiver(ref_kind)) { 289 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack. 290 __ ld_ptr(O4_first_arg_addr, O0_recv = O0); 291 DEBUG_ONLY(O4_param_size = noreg); 292 } 293 Register G5_member = G5_method; // MemberName ptr; incoming method ptr is dead now 294 __ ld_ptr(__ argument_address(constant(0)), G5_member); 295 __ add(Gargs, Interpreter::stackElementSize, Gargs); 296 generate_method_handle_dispatch(_masm, iid, O0_recv, G5_member, not_for_compiler_entry); 297 } 298 299 return entry_point; 300 } 301 302 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm, 303 vmIntrinsics::ID iid, 304 Register receiver_reg, 305 Register member_reg, 306 bool for_compiler_entry) { 307 assert(is_signature_polymorphic(iid), "expected invoke iid"); 308 Register temp1 = (for_compiler_entry ? G1_scratch : O1); 309 Register temp2 = (for_compiler_entry ? G3_scratch : O2); 310 Register temp3 = (for_compiler_entry ? G4_scratch : O3); 311 Register temp4 = (for_compiler_entry ? noreg : O4); 312 if (for_compiler_entry) { 313 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : O0), "only valid assignment"); 314 assert_different_registers(temp1, O0, O1, O2, O3, O4, O5); 315 assert_different_registers(temp2, O0, O1, O2, O3, O4, O5); 316 assert_different_registers(temp3, O0, O1, O2, O3, O4, O5); 317 assert_different_registers(temp4, O0, O1, O2, O3, O4, O5); 318 } else { 319 assert_different_registers(temp1, temp2, temp3, temp4, O5_savedSP); // don't trash lastSP 320 } 321 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg); 322 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg); 323 324 if (iid == vmIntrinsics::_invokeBasic) { 325 // indirect through MH.form.vmentry.vmtarget 326 jump_to_lambda_form(_masm, receiver_reg, G5_method, temp1, temp2, for_compiler_entry); 327 328 } else { 329 // The method is a member invoker used by direct method handles. 330 if (VerifyMethodHandles) { 331 // make sure the trailing argument really is a MemberName (caller responsibility) 332 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass), 333 temp1, temp2, 334 "MemberName required for invokeVirtual etc."); 335 } 336 337 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes())); 338 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes())); 339 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())); 340 Address vmtarget_method( G5_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())); 341 342 Register temp1_recv_klass = temp1; 343 if (iid != vmIntrinsics::_linkToStatic) { 344 __ verify_oop(receiver_reg); 345 if (iid == vmIntrinsics::_linkToSpecial) { 346 // Don't actually load the klass; just null-check the receiver. 347 __ null_check(receiver_reg); 348 } else { 349 // load receiver klass itself 350 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes()); 351 __ load_klass(receiver_reg, temp1_recv_klass); 352 __ verify_klass_ptr(temp1_recv_klass); 353 } 354 BLOCK_COMMENT("check_receiver {"); 355 // The receiver for the MemberName must be in receiver_reg. 356 // Check the receiver against the MemberName.clazz 357 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) { 358 // Did not load it above... 359 __ load_klass(receiver_reg, temp1_recv_klass); 360 __ verify_klass_ptr(temp1_recv_klass); 361 } 362 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) { 363 Label L_ok; 364 Register temp2_defc = temp2; 365 __ load_heap_oop(member_clazz, temp2_defc); 366 load_klass_from_Class(_masm, temp2_defc, temp3, temp4); 367 __ verify_klass_ptr(temp2_defc); 368 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok); 369 // If we get here, the type check failed! 370 __ STOP("receiver class disagrees with MemberName.clazz"); 371 __ bind(L_ok); 372 } 373 BLOCK_COMMENT("} check_receiver"); 374 } 375 if (iid == vmIntrinsics::_linkToSpecial || 376 iid == vmIntrinsics::_linkToStatic) { 377 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass 378 } 379 380 // Live registers at this point: 381 // member_reg - MemberName that was the trailing argument 382 // temp1_recv_klass - klass of stacked receiver, if needed 383 // O5_savedSP - interpreter linkage (if interpreted) 384 // O0..O5 - compiler arguments (if compiled) 385 386 Label L_incompatible_class_change_error; 387 switch (iid) { 388 case vmIntrinsics::_linkToSpecial: 389 if (VerifyMethodHandles) { 390 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2); 391 } 392 __ load_heap_oop(member_vmtarget, G5_method); 393 __ ld_ptr(vmtarget_method, G5_method); 394 break; 395 396 case vmIntrinsics::_linkToStatic: 397 if (VerifyMethodHandles) { 398 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2); 399 } 400 __ load_heap_oop(member_vmtarget, G5_method); 401 __ ld_ptr(vmtarget_method, G5_method); 402 break; 403 404 case vmIntrinsics::_linkToVirtual: 405 { 406 // same as TemplateTable::invokevirtual, 407 // minus the CP setup and profiling: 408 409 if (VerifyMethodHandles) { 410 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2); 411 } 412 413 // pick out the vtable index from the MemberName, and then we can discard it: 414 Register temp2_index = temp2; 415 __ ld_ptr(member_vmindex, temp2_index); 416 417 if (VerifyMethodHandles) { 418 Label L_index_ok; 419 __ cmp_and_br_short(temp2_index, (int) 0, Assembler::greaterEqual, Assembler::pn, L_index_ok); 420 __ STOP("no virtual index"); 421 __ BIND(L_index_ok); 422 } 423 424 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget 425 // at this point. And VerifyMethodHandles has already checked clazz, if needed. 426 427 // get target Method* & entry point 428 __ lookup_virtual_method(temp1_recv_klass, temp2_index, G5_method); 429 break; 430 } 431 432 case vmIntrinsics::_linkToInterface: 433 { 434 // same as TemplateTable::invokeinterface 435 // (minus the CP setup and profiling, with different argument motion) 436 if (VerifyMethodHandles) { 437 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2); 438 } 439 440 Register temp2_intf = temp2; 441 __ load_heap_oop(member_clazz, temp2_intf); 442 load_klass_from_Class(_masm, temp2_intf, temp3, temp4); 443 __ verify_klass_ptr(temp2_intf); 444 445 Register G5_index = G5_method; 446 __ ld_ptr(member_vmindex, G5_index); 447 if (VerifyMethodHandles) { 448 Label L; 449 __ cmp_and_br_short(G5_index, 0, Assembler::greaterEqual, Assembler::pt, L); 450 __ STOP("invalid vtable index for MH.invokeInterface"); 451 __ bind(L); 452 } 453 454 // given intf, index, and recv klass, dispatch to the implementation method 455 __ lookup_interface_method(temp1_recv_klass, temp2_intf, 456 // note: next two args must be the same: 457 G5_index, G5_method, 458 temp3, temp4, 459 L_incompatible_class_change_error); 460 break; 461 } 462 463 default: 464 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)); 465 break; 466 } 467 468 // Live at this point: 469 // G5_method 470 // O5_savedSP (if interpreted) 471 472 // After figuring out which concrete method to call, jump into it. 473 // Note that this works in the interpreter with no data motion. 474 // But the compiled version will require that rcx_recv be shifted out. 475 __ verify_method_ptr(G5_method); 476 jump_from_method_handle(_masm, G5_method, temp1, temp2, for_compiler_entry); 477 478 if (iid == vmIntrinsics::_linkToInterface) { 479 __ BIND(L_incompatible_class_change_error); 480 AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry()); 481 __ jump_to(icce, temp1); 482 __ delayed()->nop(); 483 } 484 } 485 } 486 487 #ifndef PRODUCT 488 void trace_method_handle_stub(const char* adaptername, 489 oopDesc* mh, 490 intptr_t* saved_sp, 491 intptr_t* args, 492 intptr_t* tracing_fp) { 493 bool has_mh = (strstr(adaptername, "/static") == NULL && 494 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH 495 const char* mh_reg_name = has_mh ? "G3_mh" : "G3"; 496 tty->print_cr("MH %s %s=" INTPTR_FORMAT " saved_sp=" INTPTR_FORMAT " args=" INTPTR_FORMAT, 497 adaptername, mh_reg_name, 498 p2i(mh), p2i(saved_sp), p2i(args)); 499 500 if (Verbose) { 501 // dumping last frame with frame::describe 502 503 JavaThread* p = JavaThread::active(); 504 505 ResourceMark rm; 506 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here 507 FrameValues values; 508 509 // Note: We want to allow trace_method_handle from any call site. 510 // While trace_method_handle creates a frame, it may be entered 511 // without a valid return PC in O7 (e.g. not just after a call). 512 // Walking that frame could lead to failures due to that invalid PC. 513 // => carefully detect that frame when doing the stack walking 514 515 // walk up to the right frame using the "tracing_fp" argument 516 intptr_t* cur_sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); 517 frame cur_frame(cur_sp, frame::unpatchable, NULL); 518 519 while (cur_frame.fp() != (intptr_t *)(STACK_BIAS+(uintptr_t)tracing_fp)) { 520 cur_frame = os::get_sender_for_C_frame(&cur_frame); 521 } 522 523 // safely create a frame and call frame::describe 524 intptr_t *dump_sp = cur_frame.sender_sp(); 525 intptr_t *dump_fp = cur_frame.link(); 526 527 bool walkable = has_mh; // whether the traced frame shoud be walkable 528 529 // the sender for cur_frame is the caller of trace_method_handle 530 if (walkable) { 531 // The previous definition of walkable may have to be refined 532 // if new call sites cause the next frame constructor to start 533 // failing. Alternatively, frame constructors could be 534 // modified to support the current or future non walkable 535 // frames (but this is more intrusive and is not considered as 536 // part of this RFE, which will instead use a simpler output). 537 frame dump_frame = frame(dump_sp, 538 cur_frame.sp(), // younger_sp 539 false); // no adaptation 540 dump_frame.describe(values, 1); 541 } else { 542 // Robust dump for frames which cannot be constructed from sp/younger_sp 543 // Add descriptions without building a Java frame to avoid issues 544 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>"); 545 values.describe(-1, dump_sp, "sp"); 546 } 547 548 bool has_args = has_mh; // whether Gargs is meaningful 549 550 // mark args, if seems valid (may not be valid for some adapters) 551 if (has_args) { 552 if ((args >= dump_sp) && (args < dump_fp)) { 553 values.describe(-1, args, "*G4_args"); 554 } 555 } 556 557 // mark saved_sp, if seems valid (may not be valid for some adapters) 558 intptr_t *unbiased_sp = (intptr_t *)(STACK_BIAS+(uintptr_t)saved_sp); 559 const int ARG_LIMIT = 255, SLOP = 45, UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP); 560 if ((unbiased_sp >= dump_sp - UNREASONABLE_STACK_MOVE) && (unbiased_sp < dump_fp)) { 561 values.describe(-1, unbiased_sp, "*saved_sp+STACK_BIAS"); 562 } 563 564 // Note: the unextended_sp may not be correct 565 tty->print_cr(" stack layout:"); 566 values.print(p); 567 if (has_mh && oopDesc::is_oop(mh)) { 568 mh->print(); 569 if (java_lang_invoke_MethodHandle::is_instance(mh)) { 570 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0) 571 java_lang_invoke_MethodHandle::form(mh)->print(); 572 } 573 } 574 } 575 } 576 577 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { 578 if (!TraceMethodHandles) return; 579 BLOCK_COMMENT("trace_method_handle {"); 580 // save: Gargs, O5_savedSP 581 __ save_frame(16); // need space for saving required FPU state 582 583 __ set((intptr_t) adaptername, O0); 584 __ mov(G3_method_handle, O1); 585 __ mov(I5_savedSP, O2); 586 __ mov(Gargs, O3); 587 __ mov(I6, O4); // frame identifier for safe stack walking 588 589 // Save scratched registers that might be needed. Robustness is more 590 // important than optimizing the saves for this debug only code. 591 592 // save FP result, valid at some call sites (adapter_opt_return_float, ...) 593 Address d_save(FP, -sizeof(jdouble) + STACK_BIAS); 594 __ stf(FloatRegisterImpl::D, Ftos_d, d_save); 595 // Safely save all globals but G2 (handled by call_VM_leaf) and G7 596 // (OS reserved). 597 __ mov(G3_method_handle, L3); 598 __ mov(Gargs, L4); 599 __ mov(G5_method_type, L5); 600 __ mov(G6, L6); 601 __ mov(G1, L1); 602 603 __ call_VM_leaf(L2 /* for G2 */, CAST_FROM_FN_PTR(address, trace_method_handle_stub)); 604 605 __ mov(L3, G3_method_handle); 606 __ mov(L4, Gargs); 607 __ mov(L5, G5_method_type); 608 __ mov(L6, G6); 609 __ mov(L1, G1); 610 __ ldf(FloatRegisterImpl::D, d_save, Ftos_d); 611 612 __ restore(); 613 BLOCK_COMMENT("} trace_method_handle"); 614 } 615 #endif // PRODUCT