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 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2"); 226 227 Label L; 228 BLOCK_COMMENT("verify_intrinsic_id {"); 229 __ cmpw(Address(rbx_method, Method::intrinsic_id_offset_in_bytes()), (int) iid); 230 __ jcc(Assembler::equal, L); 231 if (iid == vmIntrinsics::_linkToVirtual || 232 iid == vmIntrinsics::_linkToSpecial) { 233 // could do this for all kinds, but would explode assembly code size 234 trace_method_handle(_masm, "bad Method*::intrinsic_id"); 235 } 236 __ STOP("bad Method*::intrinsic_id"); 237 __ bind(L); 238 BLOCK_COMMENT("} verify_intrinsic_id"); 239 } 240 241 // First task: Find out how big the argument list is. 242 Address rdx_first_arg_addr; 243 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid); 244 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic"); 245 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) { 246 __ movptr(rdx_argp, Address(rbx_method, Method::const_offset())); 247 __ load_sized_value(rdx_argp, 248 Address(rdx_argp, ConstMethod::size_of_parameters_offset()), 249 sizeof(u2), /*is_signed*/ false); 250 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 251 rdx_first_arg_addr = __ argument_address(rdx_argp, -1); 252 } else { 253 DEBUG_ONLY(rdx_argp = noreg); 254 } 255 256 if (!is_signature_polymorphic_static(iid)) { 257 __ movptr(rcx_mh, rdx_first_arg_addr); 258 DEBUG_ONLY(rdx_argp = noreg); 259 } 260 261 // rdx_first_arg_addr is live! 262 263 trace_method_handle_interpreter_entry(_masm, iid); 264 265 if (iid == vmIntrinsics::_invokeBasic) { 266 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry); 267 268 } else { 269 // Adjust argument list by popping the trailing MemberName argument. 270 Register rcx_recv = noreg; 271 if (MethodHandles::ref_kind_has_receiver(ref_kind)) { 272 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack. 273 __ movptr(rcx_recv = rcx, rdx_first_arg_addr); 274 } 275 DEBUG_ONLY(rdx_argp = noreg); 276 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now 277 __ pop(rax_temp); // return address 278 __ pop(rbx_member); // extract last argument 279 __ push(rax_temp); // re-push return address 280 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry); 281 } 282 283 return entry_point; 284 } 285 286 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm, 287 vmIntrinsics::ID iid, 288 Register receiver_reg, 289 Register member_reg, 290 bool for_compiler_entry) { 291 assert(is_signature_polymorphic(iid), "expected invoke iid"); 292 Register rbx_method = rbx; // eventual target of this invocation 293 // temps used in this code are not used in *either* compiled or interpreted calling sequences 294 #ifdef _LP64 295 Register temp1 = rscratch1; 296 Register temp2 = rscratch2; 297 Register temp3 = rax; 298 if (for_compiler_entry) { 299 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment"); 300 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5); 301 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5); 302 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5); 303 } 304 #else 305 Register temp1 = (for_compiler_entry ? rsi : rdx); 306 Register temp2 = rdi; 307 Register temp3 = rax; 308 if (for_compiler_entry) { 309 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment"); 310 assert_different_registers(temp1, rcx, rdx); 311 assert_different_registers(temp2, rcx, rdx); 312 assert_different_registers(temp3, rcx, rdx); 313 } 314 #endif 315 else { 316 assert_different_registers(temp1, temp2, temp3, saved_last_sp_register()); // don't trash lastSP 317 } 318 assert_different_registers(temp1, temp2, temp3, receiver_reg); 319 assert_different_registers(temp1, temp2, temp3, member_reg); 320 321 if (iid == vmIntrinsics::_invokeBasic) { 322 // indirect through MH.form.vmentry.vmtarget 323 jump_to_lambda_form(_masm, receiver_reg, rbx_method, temp1, for_compiler_entry); 324 325 } else { 326 // The method is a member invoker used by direct method handles. 327 if (VerifyMethodHandles) { 328 // make sure the trailing argument really is a MemberName (caller responsibility) 329 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName), 330 "MemberName required for invokeVirtual etc."); 331 } 332 333 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes())); 334 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes())); 335 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())); 336 337 Register temp1_recv_klass = temp1; 338 if (iid != vmIntrinsics::_linkToStatic) { 339 __ verify_oop(receiver_reg); 340 if (iid == vmIntrinsics::_linkToSpecial) { 341 // Don't actually load the klass; just null-check the receiver. 342 __ null_check(receiver_reg); 343 } else { 344 // load receiver klass itself 345 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes()); 346 __ load_klass(temp1_recv_klass, receiver_reg); 347 __ verify_klass_ptr(temp1_recv_klass); 348 } 349 BLOCK_COMMENT("check_receiver {"); 350 // The receiver for the MemberName must be in receiver_reg. 351 // Check the receiver against the MemberName.clazz 352 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) { 353 // Did not load it above... 354 __ load_klass(temp1_recv_klass, receiver_reg); 355 __ verify_klass_ptr(temp1_recv_klass); 356 } 357 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) { 358 Label L_ok; 359 Register temp2_defc = temp2; 360 __ load_heap_oop(temp2_defc, member_clazz); 361 load_klass_from_Class(_masm, temp2_defc); 362 __ verify_klass_ptr(temp2_defc); 363 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok); 364 // If we get here, the type check failed! 365 __ STOP("receiver class disagrees with MemberName.clazz"); 366 __ bind(L_ok); 367 } 368 BLOCK_COMMENT("} check_receiver"); 369 } 370 if (iid == vmIntrinsics::_linkToSpecial || 371 iid == vmIntrinsics::_linkToStatic) { 372 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass 373 } 374 375 // Live registers at this point: 376 // member_reg - MemberName that was the trailing argument 377 // temp1_recv_klass - klass of stacked receiver, if needed 378 // rsi/r13 - interpreter linkage (if interpreted) 379 // rcx, rdx, rsi, rdi, r8 - compiler arguments (if compiled) 380 381 Label L_incompatible_class_change_error; 382 switch (iid) { 383 case vmIntrinsics::_linkToSpecial: 384 if (VerifyMethodHandles) { 385 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3); 386 } 387 __ movptr(rbx_method, member_vmtarget); 388 break; 389 390 case vmIntrinsics::_linkToStatic: 391 if (VerifyMethodHandles) { 392 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3); 393 } 394 __ movptr(rbx_method, member_vmtarget); 395 break; 396 397 case vmIntrinsics::_linkToVirtual: 398 { 399 // same as TemplateTable::invokevirtual, 400 // minus the CP setup and profiling: 401 402 if (VerifyMethodHandles) { 403 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3); 404 } 405 406 // pick out the vtable index from the MemberName, and then we can discard it: 407 Register temp2_index = temp2; 408 __ movptr(temp2_index, member_vmindex); 409 410 if (VerifyMethodHandles) { 411 Label L_index_ok; 412 __ cmpl(temp2_index, 0); 413 __ jcc(Assembler::greaterEqual, L_index_ok); 414 __ STOP("no virtual index"); 415 __ BIND(L_index_ok); 416 } 417 418 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget 419 // at this point. And VerifyMethodHandles has already checked clazz, if needed. 420 421 // get target Method* & entry point 422 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rbx_method); 423 break; 424 } 425 426 case vmIntrinsics::_linkToInterface: 427 { 428 // same as TemplateTable::invokeinterface 429 // (minus the CP setup and profiling, with different argument motion) 430 if (VerifyMethodHandles) { 431 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3); 432 } 433 434 Register temp3_intf = temp3; 435 __ load_heap_oop(temp3_intf, member_clazz); 436 load_klass_from_Class(_masm, temp3_intf); 437 __ verify_klass_ptr(temp3_intf); 438 439 Register rbx_index = rbx_method; 440 __ movptr(rbx_index, member_vmindex); 441 if (VerifyMethodHandles) { 442 Label L; 443 __ cmpl(rbx_index, 0); 444 __ jcc(Assembler::greaterEqual, L); 445 __ STOP("invalid vtable index for MH.invokeInterface"); 446 __ bind(L); 447 } 448 449 // given intf, index, and recv klass, dispatch to the implementation method 450 __ lookup_interface_method(temp1_recv_klass, temp3_intf, 451 // note: next two args must be the same: 452 rbx_index, rbx_method, 453 temp2, 454 L_incompatible_class_change_error); 455 break; 456 } 457 458 default: 459 fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid))); 460 break; 461 } 462 463 // Live at this point: 464 // rbx_method 465 // rsi/r13 (if interpreted) 466 467 // After figuring out which concrete method to call, jump into it. 468 // Note that this works in the interpreter with no data motion. 469 // But the compiled version will require that rcx_recv be shifted out. 470 __ verify_method_ptr(rbx_method); 471 jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry); 472 473 if (iid == vmIntrinsics::_linkToInterface) { 474 __ bind(L_incompatible_class_change_error); 475 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry())); 476 } 477 } 478 } 479 480 #ifndef PRODUCT 481 void trace_method_handle_stub(const char* adaptername, 482 oop mh, 483 intptr_t* saved_regs, 484 intptr_t* entry_sp) { 485 // called as a leaf from native code: do not block the JVM! 486 bool has_mh = (strstr(adaptername, "/static") == NULL && 487 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH 488 const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx"; 489 tty->print_cr("MH %s %s=" PTR_FORMAT " sp=" PTR_FORMAT, 490 adaptername, mh_reg_name, 491 (void *)mh, entry_sp); 492 493 if (Verbose) { 494 tty->print_cr("Registers:"); 495 const int saved_regs_count = RegisterImpl::number_of_registers; 496 for (int i = 0; i < saved_regs_count; i++) { 497 Register r = as_Register(i); 498 // The registers are stored in reverse order on the stack (by pusha). 499 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]); 500 if ((i + 1) % 4 == 0) { 501 tty->cr(); 502 } else { 503 tty->print(", "); 504 } 505 } 506 tty->cr(); 507 508 { 509 // dumping last frame with frame::describe 510 511 JavaThread* p = JavaThread::active(); 512 513 ResourceMark rm; 514 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here 515 FrameValues values; 516 517 // Note: We want to allow trace_method_handle from any call site. 518 // While trace_method_handle creates a frame, it may be entered 519 // without a PC on the stack top (e.g. not just after a call). 520 // Walking that frame could lead to failures due to that invalid PC. 521 // => carefully detect that frame when doing the stack walking 522 523 // Current C frame 524 frame cur_frame = os::current_frame(); 525 526 // Robust search of trace_calling_frame (independant of inlining). 527 // Assumes saved_regs comes from a pusha in the trace_calling_frame. 528 assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?"); 529 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame); 530 while (trace_calling_frame.fp() < saved_regs) { 531 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame); 532 } 533 534 // safely create a frame and call frame::describe 535 intptr_t *dump_sp = trace_calling_frame.sender_sp(); 536 intptr_t *dump_fp = trace_calling_frame.link(); 537 538 bool walkable = has_mh; // whether the traced frame shoud be walkable 539 540 if (walkable) { 541 // The previous definition of walkable may have to be refined 542 // if new call sites cause the next frame constructor to start 543 // failing. Alternatively, frame constructors could be 544 // modified to support the current or future non walkable 545 // frames (but this is more intrusive and is not considered as 546 // part of this RFE, which will instead use a simpler output). 547 frame dump_frame = frame(dump_sp, dump_fp); 548 dump_frame.describe(values, 1); 549 } else { 550 // Stack may not be walkable (invalid PC above FP): 551 // Add descriptions without building a Java frame to avoid issues 552 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>"); 553 values.describe(-1, dump_sp, "sp for #1"); 554 } 555 values.describe(-1, entry_sp, "raw top of stack"); 556 557 tty->print_cr("Stack layout:"); 558 values.print(p); 559 } 560 if (has_mh && mh->is_oop()) { 561 mh->print(); 562 if (java_lang_invoke_MethodHandle::is_instance(mh)) { 563 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0) 564 java_lang_invoke_MethodHandle::form(mh)->print(); 565 } 566 } 567 } 568 } 569 570 // The stub wraps the arguments in a struct on the stack to avoid 571 // dealing with the different calling conventions for passing 6 572 // arguments. 573 struct MethodHandleStubArguments { 574 const char* adaptername; 575 oopDesc* mh; 576 intptr_t* saved_regs; 577 intptr_t* entry_sp; 578 }; 579 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) { 580 trace_method_handle_stub(args->adaptername, 581 args->mh, 582 args->saved_regs, 583 args->entry_sp); 584 } 585 586 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { 587 if (!TraceMethodHandles) return; 588 BLOCK_COMMENT("trace_method_handle {"); 589 __ enter(); 590 __ andptr(rsp, -16); // align stack if needed for FPU state 591 __ pusha(); 592 __ mov(rbx, rsp); // for retreiving saved_regs 593 // Note: saved_regs must be in the entered frame for the 594 // robust stack walking implemented in trace_method_handle_stub. 595 596 // save FP result, valid at some call sites (adapter_opt_return_float, ...) 597 __ increment(rsp, -2 * wordSize); 598 if (UseSSE >= 2) { 599 __ movdbl(Address(rsp, 0), xmm0); 600 } else if (UseSSE == 1) { 601 __ movflt(Address(rsp, 0), xmm0); 602 } else { 603 __ fst_d(Address(rsp, 0)); 604 } 605 606 // Incoming state: 607 // rcx: method handle 608 // 609 // To avoid calling convention issues, build a record on the stack 610 // and pass the pointer to that instead. 611 __ push(rbp); // entry_sp (with extra align space) 612 __ push(rbx); // pusha saved_regs 613 __ push(rcx); // mh 614 __ push(rcx); // slot for adaptername 615 __ movptr(Address(rsp, 0), (intptr_t) adaptername); 616 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp); 617 __ increment(rsp, sizeof(MethodHandleStubArguments)); 618 619 if (UseSSE >= 2) { 620 __ movdbl(xmm0, Address(rsp, 0)); 621 } else if (UseSSE == 1) { 622 __ movflt(xmm0, Address(rsp, 0)); 623 } else { 624 __ fld_d(Address(rsp, 0)); 625 } 626 __ increment(rsp, 2 * wordSize); 627 628 __ popa(); 629 __ leave(); 630 BLOCK_COMMENT("} trace_method_handle"); 631 } 632 #endif //PRODUCT