1 /* 2 * Copyright (c) 1997, 2015, 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/interpreterRuntime.hpp" 30 #include "memory/allocation.inline.hpp" 31 #include "prims/methodHandles.hpp" 32 33 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 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 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) { 48 if (VerifyMethodHandles) 49 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), 50 "MH argument is a Class"); 51 __ movptr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes())); 52 } 53 54 #ifdef ASSERT 55 static int check_nonzero(const char* xname, int x) { 56 assert(x != 0, err_msg("%s should be nonzero", xname)); 57 return x; 58 } 59 #define NONZERO(x) check_nonzero(#x, x) 60 #else //ASSERT 61 #define NONZERO(x) (x) 62 #endif //ASSERT 63 64 #ifdef ASSERT 65 void MethodHandles::verify_klass(MacroAssembler* _masm, 66 Register obj, SystemDictionary::WKID klass_id, 67 const char* error_message) { 68 Klass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id); 69 KlassHandle klass = SystemDictionary::well_known_klass(klass_id); 70 Register temp = rdi; 71 Register temp2 = noreg; 72 LP64_ONLY(temp2 = rscratch1); // used by MacroAssembler::cmpptr 73 Label L_ok, L_bad; 74 BLOCK_COMMENT("verify_klass {"); 75 __ verify_oop(obj); 76 __ testptr(obj, obj); 77 __ jcc(Assembler::zero, L_bad); 78 __ push(temp); if (temp2 != noreg) __ push(temp2); 79 #define UNPUSH { if (temp2 != noreg) __ pop(temp2); __ pop(temp); } 80 __ load_klass(temp, obj); 81 __ cmpptr(temp, ExternalAddress((address) klass_addr)); 82 __ jcc(Assembler::equal, L_ok); 83 intptr_t super_check_offset = klass->super_check_offset(); 84 __ movptr(temp, Address(temp, super_check_offset)); 85 __ cmpptr(temp, ExternalAddress((address) klass_addr)); 86 __ jcc(Assembler::equal, L_ok); 87 UNPUSH; 88 __ bind(L_bad); 89 __ STOP(error_message); 90 __ BIND(L_ok); 91 UNPUSH; 92 BLOCK_COMMENT("} verify_klass"); 93 } 94 95 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) { 96 Label L; 97 BLOCK_COMMENT("verify_ref_kind {"); 98 __ movl(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes()))); 99 __ shrl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT); 100 __ andl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK); 101 __ cmpl(temp, ref_kind); 102 __ jcc(Assembler::equal, L); 103 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal); 104 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind); 105 if (ref_kind == JVM_REF_invokeVirtual || 106 ref_kind == JVM_REF_invokeSpecial) 107 // could do this for all ref_kinds, but would explode assembly code size 108 trace_method_handle(_masm, buf); 109 __ STOP(buf); 110 } 111 BLOCK_COMMENT("} verify_ref_kind"); 112 __ bind(L); 113 } 114 115 #endif //ASSERT 116 117 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp, 118 bool for_compiler_entry) { 119 assert(method == rbx, "interpreter calling convention"); 120 121 Label L_no_such_method; 122 __ testptr(rbx, rbx); 123 __ jcc(Assembler::zero, L_no_such_method); 124 125 __ verify_method_ptr(method); 126 127 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) { 128 Label run_compiled_code; 129 // JVMTI events, such as single-stepping, are implemented partly by avoiding running 130 // compiled code in threads for which the event is enabled. Check here for 131 // interp_only_mode if these events CAN be enabled. 132 #ifdef _LP64 133 Register rthread = r15_thread; 134 #else 135 Register rthread = temp; 136 __ get_thread(rthread); 137 #endif 138 // interp_only is an int, on little endian it is sufficient to test the byte only 139 // Is a cmpl faster? 140 __ cmpb(Address(rthread, JavaThread::interp_only_mode_offset()), 0); 141 __ jccb(Assembler::zero, run_compiled_code); 142 __ jmp(Address(method, Method::interpreter_entry_offset())); 143 __ BIND(run_compiled_code); 144 } 145 146 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() : 147 Method::from_interpreted_offset(); 148 __ jmp(Address(method, entry_offset)); 149 150 __ bind(L_no_such_method); 151 __ jump(RuntimeAddress(StubRoutines::throw_AbstractMethodError_entry())); 152 } 153 154 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm, 155 Register recv, Register method_temp, 156 Register temp2, 157 bool for_compiler_entry) { 158 BLOCK_COMMENT("jump_to_lambda_form {"); 159 // This is the initial entry point of a lazy method handle. 160 // After type checking, it picks up the invoker from the LambdaForm. 161 assert_different_registers(recv, method_temp, temp2); 162 assert(recv != noreg, "required register"); 163 assert(method_temp == rbx, "required register for loading method"); 164 165 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); }); 166 167 // Load the invoker, as MH -> MH.form -> LF.vmentry 168 __ verify_oop(recv); 169 __ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes()))); 170 __ verify_oop(method_temp); 171 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes()))); 172 __ verify_oop(method_temp); 173 // the following assumes that a Method* is normally compressed in the vmtarget field: 174 __ movptr(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()))); 175 176 if (VerifyMethodHandles && !for_compiler_entry) { 177 // make sure recv is already on stack 178 __ movptr(temp2, Address(method_temp, Method::const_offset())); 179 __ load_sized_value(temp2, 180 Address(temp2, ConstMethod::size_of_parameters_offset()), 181 sizeof(u2), /*is_signed*/ false); 182 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 183 Label L; 184 __ cmpptr(recv, __ argument_address(temp2, -1)); 185 __ jcc(Assembler::equal, L); 186 __ movptr(rax, __ argument_address(temp2, -1)); 187 __ STOP("receiver not on stack"); 188 __ BIND(L); 189 } 190 191 jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry); 192 BLOCK_COMMENT("} jump_to_lambda_form"); 193 } 194 195 196 // Code generation 197 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm, 198 vmIntrinsics::ID iid) { 199 const bool not_for_compiler_entry = false; // this is the interpreter entry 200 assert(is_signature_polymorphic(iid), "expected invoke iid"); 201 if (iid == vmIntrinsics::_invokeGeneric || 202 iid == vmIntrinsics::_compiledLambdaForm) { 203 // Perhaps surprisingly, the symbolic references visible to Java are not directly used. 204 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod. 205 // They all allow an appendix argument. 206 __ hlt(); // empty stubs make SG sick 207 return NULL; 208 } 209 210 // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted) 211 // rbx: Method* 212 // rdx: argument locator (parameter slot count, added to rsp) 213 // rcx: used as temp to hold mh or receiver 214 // rax, rdi: garbage temps, blown away 215 Register rdx_argp = rdx; // argument list ptr, live on error paths 216 Register rax_temp = rax; 217 Register rcx_mh = rcx; // MH receiver; dies quickly and is recycled 218 Register rbx_method = rbx; // eventual target of this invocation 219 220 // here's where control starts out: 221 __ align(CodeEntryAlignment); 222 address entry_point = __ pc(); 223 224 if (VerifyMethodHandles) { 225 Label L; 226 BLOCK_COMMENT("verify_intrinsic_id {"); 227 __ cmpb(Address(rbx_method, Method::intrinsic_id_offset_in_bytes()), (int) iid); 228 __ jcc(Assembler::equal, L); 229 if (iid == vmIntrinsics::_linkToVirtual || 230 iid == vmIntrinsics::_linkToSpecial) { 231 // could do this for all kinds, but would explode assembly code size 232 trace_method_handle(_masm, "bad Method*::intrinsic_id"); 233 } 234 __ STOP("bad Method*::intrinsic_id"); 235 __ bind(L); 236 BLOCK_COMMENT("} verify_intrinsic_id"); 237 } 238 239 // First task: Find out how big the argument list is. 240 Address rdx_first_arg_addr; 241 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid); 242 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic"); 243 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) { 244 __ movptr(rdx_argp, Address(rbx_method, Method::const_offset())); 245 __ load_sized_value(rdx_argp, 246 Address(rdx_argp, ConstMethod::size_of_parameters_offset()), 247 sizeof(u2), /*is_signed*/ false); 248 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 249 rdx_first_arg_addr = __ argument_address(rdx_argp, -1); 250 } else { 251 DEBUG_ONLY(rdx_argp = noreg); 252 } 253 254 if (!is_signature_polymorphic_static(iid)) { 255 __ movptr(rcx_mh, rdx_first_arg_addr); 256 DEBUG_ONLY(rdx_argp = noreg); 257 } 258 259 // rdx_first_arg_addr is live! 260 261 trace_method_handle_interpreter_entry(_masm, iid); 262 263 if (iid == vmIntrinsics::_invokeBasic) { 264 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry); 265 266 } else { 267 // Adjust argument list by popping the trailing MemberName argument. 268 Register rcx_recv = noreg; 269 if (MethodHandles::ref_kind_has_receiver(ref_kind)) { 270 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack. 271 __ movptr(rcx_recv = rcx, rdx_first_arg_addr); 272 } 273 DEBUG_ONLY(rdx_argp = noreg); 274 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now 275 __ pop(rax_temp); // return address 276 __ pop(rbx_member); // extract last argument 277 __ push(rax_temp); // re-push return address 278 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry); 279 } 280 281 return entry_point; 282 } 283 284 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm, 285 vmIntrinsics::ID iid, 286 Register receiver_reg, 287 Register member_reg, 288 bool for_compiler_entry) { 289 assert(is_signature_polymorphic(iid), "expected invoke iid"); 290 Register rbx_method = rbx; // eventual target of this invocation 291 // temps used in this code are not used in *either* compiled or interpreted calling sequences 292 #ifdef _LP64 293 Register temp1 = rscratch1; 294 Register temp2 = rscratch2; 295 Register temp3 = rax; 296 if (for_compiler_entry) { 297 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment"); 298 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5); 299 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5); 300 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5); 301 } 302 #else 303 Register temp1 = (for_compiler_entry ? rsi : rdx); 304 Register temp2 = rdi; 305 Register temp3 = rax; 306 if (for_compiler_entry) { 307 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment"); 308 assert_different_registers(temp1, rcx, rdx); 309 assert_different_registers(temp2, rcx, rdx); 310 assert_different_registers(temp3, rcx, rdx); 311 } 312 #endif 313 else { 314 assert_different_registers(temp1, temp2, temp3, saved_last_sp_register()); // don't trash lastSP 315 } 316 assert_different_registers(temp1, temp2, temp3, receiver_reg); 317 assert_different_registers(temp1, temp2, temp3, member_reg); 318 319 if (iid == vmIntrinsics::_invokeBasic) { 320 // indirect through MH.form.vmentry.vmtarget 321 jump_to_lambda_form(_masm, receiver_reg, rbx_method, temp1, for_compiler_entry); 322 323 } else { 324 // The method is a member invoker used by direct method handles. 325 if (VerifyMethodHandles) { 326 // make sure the trailing argument really is a MemberName (caller responsibility) 327 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName), 328 "MemberName required for invokeVirtual etc."); 329 } 330 331 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes())); 332 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes())); 333 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())); 334 335 Register temp1_recv_klass = temp1; 336 if (iid != vmIntrinsics::_linkToStatic) { 337 __ verify_oop(receiver_reg); 338 if (iid == vmIntrinsics::_linkToSpecial) { 339 // Don't actually load the klass; just null-check the receiver. 340 __ null_check(receiver_reg); 341 } else { 342 // load receiver klass itself 343 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes()); 344 __ load_klass(temp1_recv_klass, receiver_reg); 345 __ verify_klass_ptr(temp1_recv_klass); 346 } 347 BLOCK_COMMENT("check_receiver {"); 348 // The receiver for the MemberName must be in receiver_reg. 349 // Check the receiver against the MemberName.clazz 350 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) { 351 // Did not load it above... 352 __ load_klass(temp1_recv_klass, receiver_reg); 353 __ verify_klass_ptr(temp1_recv_klass); 354 } 355 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) { 356 Label L_ok; 357 Register temp2_defc = temp2; 358 __ load_heap_oop(temp2_defc, member_clazz); 359 load_klass_from_Class(_masm, temp2_defc); 360 __ verify_klass_ptr(temp2_defc); 361 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok); 362 // If we get here, the type check failed! 363 __ STOP("receiver class disagrees with MemberName.clazz"); 364 __ bind(L_ok); 365 } 366 BLOCK_COMMENT("} check_receiver"); 367 } 368 if (iid == vmIntrinsics::_linkToSpecial || 369 iid == vmIntrinsics::_linkToStatic) { 370 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass 371 } 372 373 // Live registers at this point: 374 // member_reg - MemberName that was the trailing argument 375 // temp1_recv_klass - klass of stacked receiver, if needed 376 // rsi/r13 - interpreter linkage (if interpreted) 377 // rcx, rdx, rsi, rdi, r8 - compiler arguments (if compiled) 378 379 Label L_incompatible_class_change_error; 380 switch (iid) { 381 case vmIntrinsics::_linkToSpecial: 382 if (VerifyMethodHandles) { 383 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3); 384 } 385 __ movptr(rbx_method, member_vmtarget); 386 break; 387 388 case vmIntrinsics::_linkToStatic: 389 if (VerifyMethodHandles) { 390 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3); 391 } 392 __ movptr(rbx_method, member_vmtarget); 393 break; 394 395 case vmIntrinsics::_linkToVirtual: 396 { 397 // same as TemplateTable::invokevirtual, 398 // minus the CP setup and profiling: 399 400 if (VerifyMethodHandles) { 401 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3); 402 } 403 404 // pick out the vtable index from the MemberName, and then we can discard it: 405 Register temp2_index = temp2; 406 __ movptr(temp2_index, member_vmindex); 407 408 if (VerifyMethodHandles) { 409 Label L_index_ok; 410 __ cmpl(temp2_index, 0); 411 __ jcc(Assembler::greaterEqual, L_index_ok); 412 __ STOP("no virtual index"); 413 __ BIND(L_index_ok); 414 } 415 416 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget 417 // at this point. And VerifyMethodHandles has already checked clazz, if needed. 418 419 // get target Method* & entry point 420 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rbx_method); 421 break; 422 } 423 424 case vmIntrinsics::_linkToInterface: 425 { 426 // same as TemplateTable::invokeinterface 427 // (minus the CP setup and profiling, with different argument motion) 428 if (VerifyMethodHandles) { 429 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3); 430 } 431 432 Register temp3_intf = temp3; 433 __ load_heap_oop(temp3_intf, member_clazz); 434 load_klass_from_Class(_masm, temp3_intf); 435 __ verify_klass_ptr(temp3_intf); 436 437 Register rbx_index = rbx_method; 438 __ movptr(rbx_index, member_vmindex); 439 if (VerifyMethodHandles) { 440 Label L; 441 __ cmpl(rbx_index, 0); 442 __ jcc(Assembler::greaterEqual, L); 443 __ STOP("invalid vtable index for MH.invokeInterface"); 444 __ bind(L); 445 } 446 447 // given intf, index, and recv klass, dispatch to the implementation method 448 __ lookup_interface_method(temp1_recv_klass, temp3_intf, 449 // note: next two args must be the same: 450 rbx_index, rbx_method, 451 temp2, 452 L_incompatible_class_change_error); 453 break; 454 } 455 456 default: 457 fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid))); 458 break; 459 } 460 461 // Live at this point: 462 // rbx_method 463 // rsi/r13 (if interpreted) 464 465 // After figuring out which concrete method to call, jump into it. 466 // Note that this works in the interpreter with no data motion. 467 // But the compiled version will require that rcx_recv be shifted out. 468 __ verify_method_ptr(rbx_method); 469 jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry); 470 471 if (iid == vmIntrinsics::_linkToInterface) { 472 __ bind(L_incompatible_class_change_error); 473 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry())); 474 } 475 } 476 } 477 478 #ifndef PRODUCT 479 void trace_method_handle_stub(const char* adaptername, 480 oop mh, 481 intptr_t* saved_regs, 482 intptr_t* entry_sp) { 483 // called as a leaf from native code: do not block the JVM! 484 bool has_mh = (strstr(adaptername, "/static") == NULL && 485 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH 486 const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx"; 487 tty->print_cr("MH %s %s=" PTR_FORMAT " sp=" PTR_FORMAT, 488 adaptername, mh_reg_name, 489 (void *)mh, entry_sp); 490 491 if (Verbose) { 492 tty->print_cr("Registers:"); 493 const int saved_regs_count = RegisterImpl::number_of_registers; 494 for (int i = 0; i < saved_regs_count; i++) { 495 Register r = as_Register(i); 496 // The registers are stored in reverse order on the stack (by pusha). 497 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]); 498 if ((i + 1) % 4 == 0) { 499 tty->cr(); 500 } else { 501 tty->print(", "); 502 } 503 } 504 tty->cr(); 505 506 { 507 // dumping last frame with frame::describe 508 509 JavaThread* p = JavaThread::active(); 510 511 ResourceMark rm; 512 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here 513 FrameValues values; 514 515 // Note: We want to allow trace_method_handle from any call site. 516 // While trace_method_handle creates a frame, it may be entered 517 // without a PC on the stack top (e.g. not just after a call). 518 // Walking that frame could lead to failures due to that invalid PC. 519 // => carefully detect that frame when doing the stack walking 520 521 // Current C frame 522 frame cur_frame = os::current_frame(); 523 524 // Robust search of trace_calling_frame (independant of inlining). 525 // Assumes saved_regs comes from a pusha in the trace_calling_frame. 526 assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?"); 527 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame); 528 while (trace_calling_frame.fp() < saved_regs) { 529 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame); 530 } 531 532 // safely create a frame and call frame::describe 533 intptr_t *dump_sp = trace_calling_frame.sender_sp(); 534 intptr_t *dump_fp = trace_calling_frame.link(); 535 536 bool walkable = has_mh; // whether the traced frame shoud be walkable 537 538 if (walkable) { 539 // The previous definition of walkable may have to be refined 540 // if new call sites cause the next frame constructor to start 541 // failing. Alternatively, frame constructors could be 542 // modified to support the current or future non walkable 543 // frames (but this is more intrusive and is not considered as 544 // part of this RFE, which will instead use a simpler output). 545 frame dump_frame = frame(dump_sp, dump_fp); 546 dump_frame.describe(values, 1); 547 } else { 548 // Stack may not be walkable (invalid PC above FP): 549 // Add descriptions without building a Java frame to avoid issues 550 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>"); 551 values.describe(-1, dump_sp, "sp for #1"); 552 } 553 values.describe(-1, entry_sp, "raw top of stack"); 554 555 tty->print_cr("Stack layout:"); 556 values.print(p); 557 } 558 if (has_mh && mh->is_oop()) { 559 mh->print(); 560 if (java_lang_invoke_MethodHandle::is_instance(mh)) { 561 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0) 562 java_lang_invoke_MethodHandle::form(mh)->print(); 563 } 564 } 565 } 566 } 567 568 // The stub wraps the arguments in a struct on the stack to avoid 569 // dealing with the different calling conventions for passing 6 570 // arguments. 571 struct MethodHandleStubArguments { 572 const char* adaptername; 573 oopDesc* mh; 574 intptr_t* saved_regs; 575 intptr_t* entry_sp; 576 }; 577 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) { 578 trace_method_handle_stub(args->adaptername, 579 args->mh, 580 args->saved_regs, 581 args->entry_sp); 582 } 583 584 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { 585 if (!TraceMethodHandles) return; 586 BLOCK_COMMENT("trace_method_handle {"); 587 __ enter(); 588 __ andptr(rsp, -16); // align stack if needed for FPU state 589 __ pusha(); 590 __ mov(rbx, rsp); // for retreiving saved_regs 591 // Note: saved_regs must be in the entered frame for the 592 // robust stack walking implemented in trace_method_handle_stub. 593 594 // save FP result, valid at some call sites (adapter_opt_return_float, ...) 595 __ increment(rsp, -2 * wordSize); 596 if (UseSSE >= 2) { 597 __ movdbl(Address(rsp, 0), xmm0); 598 } else if (UseSSE == 1) { 599 __ movflt(Address(rsp, 0), xmm0); 600 } else { 601 __ fst_d(Address(rsp, 0)); 602 } 603 604 // Incoming state: 605 // rcx: method handle 606 // 607 // To avoid calling convention issues, build a record on the stack 608 // and pass the pointer to that instead. 609 __ push(rbp); // entry_sp (with extra align space) 610 __ push(rbx); // pusha saved_regs 611 __ push(rcx); // mh 612 __ push(rcx); // slot for adaptername 613 __ movptr(Address(rsp, 0), (intptr_t) adaptername); 614 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp); 615 __ increment(rsp, sizeof(MethodHandleStubArguments)); 616 617 if (UseSSE >= 2) { 618 __ movdbl(xmm0, Address(rsp, 0)); 619 } else if (UseSSE == 1) { 620 __ movflt(xmm0, Address(rsp, 0)); 621 } else { 622 __ fld_d(Address(rsp, 0)); 623 } 624 __ increment(rsp, 2 * wordSize); 625 626 __ popa(); 627 __ leave(); 628 BLOCK_COMMENT("} trace_method_handle"); 629 } 630 #endif //PRODUCT