1 /* 2 * Copyright (c) 1997, 2018, 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/interpreterRuntime.hpp" 31 #include "memory/allocation.inline.hpp" 32 #include "memory/resourceArea.hpp" 33 #include "prims/methodHandles.hpp" 34 #include "runtime/flags/flagSetting.hpp" 35 #include "runtime/frame.inline.hpp" 36 #include "utilities/preserveException.hpp" 37 38 #define __ _masm-> 39 40 #ifdef PRODUCT 41 #define BLOCK_COMMENT(str) /* nothing */ 42 #define STOP(error) stop(error) 43 #else 44 #define BLOCK_COMMENT(str) __ block_comment(str) 45 #define STOP(error) block_comment(error); __ stop(error) 46 #endif 47 48 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") 49 50 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) { 51 if (VerifyMethodHandles) 52 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), 53 "MH argument is a Class"); 54 __ movptr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes())); 55 } 56 57 #ifdef ASSERT 58 static int check_nonzero(const char* xname, int x) { 59 assert(x != 0, "%s should be nonzero", xname); 60 return x; 61 } 62 #define NONZERO(x) check_nonzero(#x, x) 63 #else //ASSERT 64 #define NONZERO(x) (x) 65 #endif //ASSERT 66 67 #ifdef ASSERT 68 void MethodHandles::verify_klass(MacroAssembler* _masm, 69 Register obj, SystemDictionary::WKID klass_id, 70 const char* error_message) { 71 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id); 72 Klass* klass = SystemDictionary::well_known_klass(klass_id); 73 Register temp = rdi; 74 Register temp2 = noreg; 75 LP64_ONLY(temp2 = rscratch1); // used by MacroAssembler::cmpptr 76 Label L_ok, L_bad; 77 BLOCK_COMMENT("verify_klass {"); 78 __ verify_oop(obj); 79 __ testptr(obj, obj); 80 __ jcc(Assembler::zero, L_bad); 81 __ push(temp); if (temp2 != noreg) __ push(temp2); 82 #define UNPUSH { if (temp2 != noreg) __ pop(temp2); __ pop(temp); } 83 __ load_klass(temp, obj); 84 __ cmpptr(temp, ExternalAddress((address) klass_addr)); 85 __ jcc(Assembler::equal, L_ok); 86 intptr_t super_check_offset = klass->super_check_offset(); 87 __ movptr(temp, Address(temp, super_check_offset)); 88 __ cmpptr(temp, ExternalAddress((address) klass_addr)); 89 __ jcc(Assembler::equal, L_ok); 90 UNPUSH; 91 __ bind(L_bad); 92 __ STOP(error_message); 93 __ BIND(L_ok); 94 UNPUSH; 95 BLOCK_COMMENT("} verify_klass"); 96 } 97 98 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) { 99 Label L; 100 BLOCK_COMMENT("verify_ref_kind {"); 101 __ movl(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes()))); 102 __ shrl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT); 103 __ andl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK); 104 __ cmpl(temp, ref_kind); 105 __ jcc(Assembler::equal, L); 106 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal); 107 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind); 108 if (ref_kind == JVM_REF_invokeVirtual || 109 ref_kind == JVM_REF_invokeSpecial) 110 // could do this for all ref_kinds, but would explode assembly code size 111 trace_method_handle(_masm, buf); 112 __ STOP(buf); 113 } 114 BLOCK_COMMENT("} verify_ref_kind"); 115 __ bind(L); 116 } 117 118 #endif //ASSERT 119 120 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp, 121 bool for_compiler_entry) { 122 assert(method == rbx, "interpreter calling convention"); 123 124 Label L_no_such_method; 125 __ testptr(rbx, rbx); 126 __ jcc(Assembler::zero, L_no_such_method); 127 128 __ verify_method_ptr(method); 129 130 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) { 131 Label run_compiled_code; 132 // JVMTI events, such as single-stepping, are implemented partly by avoiding running 133 // compiled code in threads for which the event is enabled. Check here for 134 // interp_only_mode if these events CAN be enabled. 135 #ifdef _LP64 136 Register rthread = r15_thread; 137 #else 138 Register rthread = temp; 139 __ get_thread(rthread); 140 #endif 141 // interp_only is an int, on little endian it is sufficient to test the byte only 142 // Is a cmpl faster? 143 __ cmpb(Address(rthread, JavaThread::interp_only_mode_offset()), 0); 144 __ jccb(Assembler::zero, run_compiled_code); 145 __ jmp(Address(method, Method::interpreter_entry_offset())); 146 __ BIND(run_compiled_code); 147 } 148 149 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() : 150 Method::from_interpreted_offset(); 151 __ jmp(Address(method, entry_offset)); 152 153 __ bind(L_no_such_method); 154 __ jump(RuntimeAddress(StubRoutines::throw_AbstractMethodError_entry())); 155 } 156 157 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm, 158 Register recv, Register method_temp, 159 Register temp2, 160 bool for_compiler_entry) { 161 BLOCK_COMMENT("jump_to_lambda_form {"); 162 // This is the initial entry point of a lazy method handle. 163 // After type checking, it picks up the invoker from the LambdaForm. 164 assert_different_registers(recv, method_temp, temp2); 165 assert(recv != noreg, "required register"); 166 assert(method_temp == rbx, "required register for loading method"); 167 168 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); }); 169 170 // Load the invoker, as MH -> MH.form -> LF.vmentry 171 __ verify_oop(recv); 172 __ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())), temp2); 173 __ verify_oop(method_temp); 174 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())), temp2); 175 __ verify_oop(method_temp); 176 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())), temp2); 177 __ verify_oop(method_temp); 178 __ movptr(method_temp, Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes()))); 179 180 if (VerifyMethodHandles && !for_compiler_entry) { 181 // make sure recv is already on stack 182 __ movptr(temp2, Address(method_temp, Method::const_offset())); 183 __ load_sized_value(temp2, 184 Address(temp2, ConstMethod::size_of_parameters_offset()), 185 sizeof(u2), /*is_signed*/ false); 186 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 187 Label L; 188 __ cmpoop(recv, __ argument_address(temp2, -1)); 189 __ jcc(Assembler::equal, L); 190 __ movptr(rax, __ argument_address(temp2, -1)); 191 __ STOP("receiver not on stack"); 192 __ BIND(L); 193 } 194 195 jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry); 196 BLOCK_COMMENT("} jump_to_lambda_form"); 197 } 198 199 200 // Code generation 201 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm, 202 vmIntrinsics::ID iid) { 203 const bool not_for_compiler_entry = false; // this is the interpreter entry 204 assert(is_signature_polymorphic(iid), "expected invoke iid"); 205 if (iid == vmIntrinsics::_invokeGeneric || 206 iid == vmIntrinsics::_compiledLambdaForm) { 207 // Perhaps surprisingly, the symbolic references visible to Java are not directly used. 208 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod. 209 // They all allow an appendix argument. 210 __ hlt(); // empty stubs make SG sick 211 return NULL; 212 } 213 214 // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted) 215 // rbx: Method* 216 // rdx: argument locator (parameter slot count, added to rsp) 217 // rcx: used as temp to hold mh or receiver 218 // rax, rdi: garbage temps, blown away 219 Register rdx_argp = rdx; // argument list ptr, live on error paths 220 Register rax_temp = rax; 221 Register rcx_mh = rcx; // MH receiver; dies quickly and is recycled 222 Register rbx_method = rbx; // eventual target of this invocation 223 224 // here's where control starts out: 225 __ align(CodeEntryAlignment); 226 address entry_point = __ pc(); 227 228 if (VerifyMethodHandles) { 229 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2"); 230 231 Label L; 232 BLOCK_COMMENT("verify_intrinsic_id {"); 233 __ cmpw(Address(rbx_method, Method::intrinsic_id_offset_in_bytes()), (int) iid); 234 __ jcc(Assembler::equal, L); 235 if (iid == vmIntrinsics::_linkToVirtual || 236 iid == vmIntrinsics::_linkToSpecial) { 237 // could do this for all kinds, but would explode assembly code size 238 trace_method_handle(_masm, "bad Method*::intrinsic_id"); 239 } 240 __ STOP("bad Method*::intrinsic_id"); 241 __ bind(L); 242 BLOCK_COMMENT("} verify_intrinsic_id"); 243 } 244 245 // First task: Find out how big the argument list is. 246 Address rdx_first_arg_addr; 247 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid); 248 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic"); 249 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) { 250 __ movptr(rdx_argp, Address(rbx_method, Method::const_offset())); 251 __ load_sized_value(rdx_argp, 252 Address(rdx_argp, ConstMethod::size_of_parameters_offset()), 253 sizeof(u2), /*is_signed*/ false); 254 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 255 rdx_first_arg_addr = __ argument_address(rdx_argp, -1); 256 } else { 257 DEBUG_ONLY(rdx_argp = noreg); 258 } 259 260 if (!is_signature_polymorphic_static(iid)) { 261 __ movptr(rcx_mh, rdx_first_arg_addr); 262 DEBUG_ONLY(rdx_argp = noreg); 263 } 264 265 // rdx_first_arg_addr is live! 266 267 trace_method_handle_interpreter_entry(_masm, iid); 268 269 if (iid == vmIntrinsics::_invokeBasic) { 270 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry); 271 272 } else { 273 // Adjust argument list by popping the trailing MemberName argument. 274 Register rcx_recv = noreg; 275 if (MethodHandles::ref_kind_has_receiver(ref_kind)) { 276 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack. 277 __ movptr(rcx_recv = rcx, rdx_first_arg_addr); 278 } 279 DEBUG_ONLY(rdx_argp = noreg); 280 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now 281 __ pop(rax_temp); // return address 282 __ pop(rbx_member); // extract last argument 283 __ push(rax_temp); // re-push return address 284 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry); 285 } 286 287 return entry_point; 288 } 289 290 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm, 291 vmIntrinsics::ID iid, 292 Register receiver_reg, 293 Register member_reg, 294 bool for_compiler_entry) { 295 assert(is_signature_polymorphic(iid), "expected invoke iid"); 296 Register rbx_method = rbx; // eventual target of this invocation 297 // temps used in this code are not used in *either* compiled or interpreted calling sequences 298 #ifdef _LP64 299 Register temp1 = rscratch1; 300 Register temp2 = rscratch2; 301 Register temp3 = rax; 302 if (for_compiler_entry) { 303 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment"); 304 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5); 305 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5); 306 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5); 307 } 308 #else 309 Register temp1 = (for_compiler_entry ? rsi : rdx); 310 Register temp2 = rdi; 311 Register temp3 = rax; 312 if (for_compiler_entry) { 313 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment"); 314 assert_different_registers(temp1, rcx, rdx); 315 assert_different_registers(temp2, rcx, rdx); 316 assert_different_registers(temp3, rcx, rdx); 317 } 318 #endif 319 else { 320 assert_different_registers(temp1, temp2, temp3, saved_last_sp_register()); // don't trash lastSP 321 } 322 assert_different_registers(temp1, temp2, temp3, receiver_reg); 323 assert_different_registers(temp1, temp2, temp3, member_reg); 324 325 if (iid == vmIntrinsics::_invokeBasic) { 326 // indirect through MH.form.vmentry.vmtarget 327 jump_to_lambda_form(_masm, receiver_reg, rbx_method, temp1, for_compiler_entry); 328 329 } else { 330 // The method is a member invoker used by direct method handles. 331 if (VerifyMethodHandles) { 332 // make sure the trailing argument really is a MemberName (caller responsibility) 333 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName), 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( rbx_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(temp1_recv_klass, receiver_reg); 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(temp1_recv_klass, receiver_reg); 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(temp2_defc, member_clazz, temp3); 366 load_klass_from_Class(_masm, temp2_defc); 367 __ verify_klass_ptr(temp2_defc); 368 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, 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 // rsi/r13 - interpreter linkage (if interpreted) 384 // rcx, rdx, rsi, rdi, r8 - 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, temp3); 391 } 392 __ load_heap_oop(rbx_method, member_vmtarget); 393 __ movptr(rbx_method, vmtarget_method); 394 break; 395 396 case vmIntrinsics::_linkToStatic: 397 if (VerifyMethodHandles) { 398 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3); 399 } 400 __ load_heap_oop(rbx_method, member_vmtarget); 401 __ movptr(rbx_method, vmtarget_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, temp3); 411 } 412 413 // pick out the vtable index from the MemberName, and then we can discard it: 414 Register temp2_index = temp2; 415 __ movptr(temp2_index, member_vmindex); 416 417 if (VerifyMethodHandles) { 418 Label L_index_ok; 419 __ cmpl(temp2_index, 0); 420 __ jcc(Assembler::greaterEqual, L_index_ok); 421 __ STOP("no virtual index"); 422 __ BIND(L_index_ok); 423 } 424 425 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget 426 // at this point. And VerifyMethodHandles has already checked clazz, if needed. 427 428 // get target Method* & entry point 429 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rbx_method); 430 break; 431 } 432 433 case vmIntrinsics::_linkToInterface: 434 { 435 // same as TemplateTable::invokeinterface 436 // (minus the CP setup and profiling, with different argument motion) 437 if (VerifyMethodHandles) { 438 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3); 439 } 440 441 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler(); 442 443 Register temp3_intf = temp3; 444 __ load_heap_oop(temp3_intf, member_clazz); 445 load_klass_from_Class(_masm, temp3_intf); 446 __ verify_klass_ptr(temp3_intf); 447 448 Register rbx_index = rbx_method; 449 __ movptr(rbx_index, member_vmindex); 450 if (VerifyMethodHandles) { 451 Label L; 452 __ cmpl(rbx_index, 0); 453 __ jcc(Assembler::greaterEqual, L); 454 __ STOP("invalid vtable index for MH.invokeInterface"); 455 __ bind(L); 456 } 457 458 // given intf, index, and recv klass, dispatch to the implementation method 459 __ lookup_interface_method(temp1_recv_klass, temp3_intf, 460 // note: next two args must be the same: 461 rbx_index, rbx_method, 462 temp2, 463 L_incompatible_class_change_error); 464 break; 465 } 466 467 default: 468 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)); 469 break; 470 } 471 472 // Live at this point: 473 // rbx_method 474 // rsi/r13 (if interpreted) 475 476 // After figuring out which concrete method to call, jump into it. 477 // Note that this works in the interpreter with no data motion. 478 // But the compiled version will require that rcx_recv be shifted out. 479 __ verify_method_ptr(rbx_method); 480 jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry); 481 482 if (iid == vmIntrinsics::_linkToInterface) { 483 __ bind(L_incompatible_class_change_error); 484 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry())); 485 } 486 } 487 } 488 489 #ifndef PRODUCT 490 void trace_method_handle_stub(const char* adaptername, 491 oop mh, 492 intptr_t* saved_regs, 493 intptr_t* entry_sp) { 494 // called as a leaf from native code: do not block the JVM! 495 bool has_mh = (strstr(adaptername, "/static") == NULL && 496 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH 497 const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx"; 498 tty->print_cr("MH %s %s=" PTR_FORMAT " sp=" PTR_FORMAT, 499 adaptername, mh_reg_name, 500 p2i(mh), p2i(entry_sp)); 501 502 if (Verbose) { 503 tty->print_cr("Registers:"); 504 const int saved_regs_count = RegisterImpl::number_of_registers; 505 for (int i = 0; i < saved_regs_count; i++) { 506 Register r = as_Register(i); 507 // The registers are stored in reverse order on the stack (by pusha). 508 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]); 509 if ((i + 1) % 4 == 0) { 510 tty->cr(); 511 } else { 512 tty->print(", "); 513 } 514 } 515 tty->cr(); 516 517 { 518 // dumping last frame with frame::describe 519 520 JavaThread* p = JavaThread::active(); 521 522 ResourceMark rm; 523 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here 524 FrameValues values; 525 526 // Note: We want to allow trace_method_handle from any call site. 527 // While trace_method_handle creates a frame, it may be entered 528 // without a PC on the stack top (e.g. not just after a call). 529 // Walking that frame could lead to failures due to that invalid PC. 530 // => carefully detect that frame when doing the stack walking 531 532 // Current C frame 533 frame cur_frame = os::current_frame(); 534 535 // Robust search of trace_calling_frame (independant of inlining). 536 // Assumes saved_regs comes from a pusha in the trace_calling_frame. 537 assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?"); 538 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame); 539 while (trace_calling_frame.fp() < saved_regs) { 540 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame); 541 } 542 543 // safely create a frame and call frame::describe 544 intptr_t *dump_sp = trace_calling_frame.sender_sp(); 545 intptr_t *dump_fp = trace_calling_frame.link(); 546 547 bool walkable = has_mh; // whether the traced frame shoud be walkable 548 549 if (walkable) { 550 // The previous definition of walkable may have to be refined 551 // if new call sites cause the next frame constructor to start 552 // failing. Alternatively, frame constructors could be 553 // modified to support the current or future non walkable 554 // frames (but this is more intrusive and is not considered as 555 // part of this RFE, which will instead use a simpler output). 556 frame dump_frame = frame(dump_sp, dump_fp); 557 dump_frame.describe(values, 1); 558 } else { 559 // Stack may not be walkable (invalid PC above FP): 560 // Add descriptions without building a Java frame to avoid issues 561 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>"); 562 values.describe(-1, dump_sp, "sp for #1"); 563 } 564 values.describe(-1, entry_sp, "raw top of stack"); 565 566 tty->print_cr("Stack layout:"); 567 values.print(p); 568 } 569 if (has_mh && oopDesc::is_oop(mh)) { 570 mh->print(); 571 if (java_lang_invoke_MethodHandle::is_instance(mh)) { 572 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0) 573 java_lang_invoke_MethodHandle::form(mh)->print(); 574 } 575 } 576 } 577 } 578 579 // The stub wraps the arguments in a struct on the stack to avoid 580 // dealing with the different calling conventions for passing 6 581 // arguments. 582 struct MethodHandleStubArguments { 583 const char* adaptername; 584 oopDesc* mh; 585 intptr_t* saved_regs; 586 intptr_t* entry_sp; 587 }; 588 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) { 589 trace_method_handle_stub(args->adaptername, 590 args->mh, 591 args->saved_regs, 592 args->entry_sp); 593 } 594 595 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { 596 if (!TraceMethodHandles) return; 597 BLOCK_COMMENT(err_msg("trace_method_handle %s {", adaptername)); 598 __ enter(); 599 __ andptr(rsp, -16); // align stack if needed for FPU state 600 __ pusha(); 601 __ mov(rbx, rsp); // for retreiving saved_regs 602 // Note: saved_regs must be in the entered frame for the 603 // robust stack walking implemented in trace_method_handle_stub. 604 605 // save FP result, valid at some call sites (adapter_opt_return_float, ...) 606 __ increment(rsp, -2 * wordSize); 607 if (UseSSE >= 2) { 608 __ movdbl(Address(rsp, 0), xmm0); 609 } else if (UseSSE == 1) { 610 __ movflt(Address(rsp, 0), xmm0); 611 } else { 612 __ fst_d(Address(rsp, 0)); 613 } 614 615 // Incoming state: 616 // rcx: method handle 617 // 618 // To avoid calling convention issues, build a record on the stack 619 // and pass the pointer to that instead. 620 __ push(rbp); // entry_sp (with extra align space) 621 __ push(rbx); // pusha saved_regs 622 __ push(rcx); // mh 623 __ push(rcx); // slot for adaptername 624 __ movptr(Address(rsp, 0), (intptr_t) adaptername); 625 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp); 626 __ increment(rsp, sizeof(MethodHandleStubArguments)); 627 628 if (UseSSE >= 2) { 629 __ movdbl(xmm0, Address(rsp, 0)); 630 } else if (UseSSE == 1) { 631 __ movflt(xmm0, Address(rsp, 0)); 632 } else { 633 __ fld_d(Address(rsp, 0)); 634 } 635 __ increment(rsp, 2 * wordSize); 636 637 __ popa(); 638 __ leave(); 639 BLOCK_COMMENT("} trace_method_handle"); 640 } 641 #endif //PRODUCT