1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "asm/macroAssembler.hpp" 27 #include "classfile/javaClasses.inline.hpp" 28 #include "interpreter/interpreter.hpp" 29 #include "interpreter/interpreterRuntime.hpp" 30 #include "memory/allocation.inline.hpp" 31 #include "memory/resourceArea.hpp" 32 #include "prims/methodHandles.hpp" 33 34 #define __ _masm-> 35 36 #ifdef PRODUCT 37 #define BLOCK_COMMENT(str) /* nothing */ 38 #define STOP(error) stop(error) 39 #else 40 #define BLOCK_COMMENT(str) __ block_comment(str) 41 #define STOP(error) block_comment(error); __ stop(error) 42 #endif 43 44 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") 45 46 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) { 47 if (VerifyMethodHandles) 48 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), 49 "MH argument is a Class"); 50 __ movptr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes())); 51 } 52 53 #ifdef ASSERT 54 static int check_nonzero(const char* xname, int x) { 55 assert(x != 0, "%s should be nonzero", xname); 56 return x; 57 } 58 #define NONZERO(x) check_nonzero(#x, x) 59 #else //ASSERT 60 #define NONZERO(x) (x) 61 #endif //ASSERT 62 63 #ifdef ASSERT 64 void MethodHandles::verify_klass(MacroAssembler* _masm, 65 Register obj, SystemDictionary::WKID klass_id, 66 const char* error_message) { 67 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id); 68 Klass* klass = SystemDictionary::well_known_klass(klass_id); 69 Register temp = rdi; 70 Register temp2 = noreg; 71 LP64_ONLY(temp2 = rscratch1); // used by MacroAssembler::cmpptr 72 Label L_ok, L_bad; 73 BLOCK_COMMENT("verify_klass {"); 74 __ verify_oop(obj); 75 __ testptr(obj, obj); 76 __ jcc(Assembler::zero, L_bad); 77 __ push(temp); if (temp2 != noreg) __ push(temp2); 78 #define UNPUSH { if (temp2 != noreg) __ pop(temp2); __ pop(temp); } 79 __ load_klass(temp, obj); 80 __ cmpptr(temp, ExternalAddress((address) klass_addr)); 81 __ jcc(Assembler::equal, L_ok); 82 intptr_t super_check_offset = klass->super_check_offset(); 83 __ movptr(temp, Address(temp, super_check_offset)); 84 __ cmpptr(temp, ExternalAddress((address) klass_addr)); 85 __ jcc(Assembler::equal, L_ok); 86 UNPUSH; 87 __ bind(L_bad); 88 __ STOP(error_message); 89 __ BIND(L_ok); 90 UNPUSH; 91 BLOCK_COMMENT("} verify_klass"); 92 } 93 94 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) { 95 Label L; 96 BLOCK_COMMENT("verify_ref_kind {"); 97 __ movl(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes()))); 98 __ shrl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT); 99 __ andl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK); 100 __ cmpl(temp, ref_kind); 101 __ jcc(Assembler::equal, L); 102 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal); 103 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind); 104 if (ref_kind == JVM_REF_invokeVirtual || 105 ref_kind == JVM_REF_invokeSpecial) 106 // could do this for all ref_kinds, but would explode assembly code size 107 trace_method_handle(_masm, buf); 108 __ STOP(buf); 109 } 110 BLOCK_COMMENT("} verify_ref_kind"); 111 __ bind(L); 112 } 113 114 #endif //ASSERT 115 116 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp, 117 bool for_compiler_entry) { 118 assert(method == rbx, "interpreter calling convention"); 119 120 Label L_no_such_method; 121 __ testptr(rbx, rbx); 122 __ jcc(Assembler::zero, L_no_such_method); 123 124 __ verify_method_ptr(method); 125 126 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) { 127 Label run_compiled_code; 128 // JVMTI events, such as single-stepping, are implemented partly by avoiding running 129 // compiled code in threads for which the event is enabled. Check here for 130 // interp_only_mode if these events CAN be enabled. 131 #ifdef _LP64 132 Register rthread = r15_thread; 133 #else 134 Register rthread = temp; 135 __ get_thread(rthread); 136 #endif 137 // interp_only is an int, on little endian it is sufficient to test the byte only 138 // Is a cmpl faster? 139 __ cmpb(Address(rthread, JavaThread::interp_only_mode_offset()), 0); 140 __ jccb(Assembler::zero, run_compiled_code); 141 __ jmp(Address(method, Method::interpreter_entry_offset())); 142 __ BIND(run_compiled_code); 143 } 144 145 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() : 146 Method::from_interpreted_offset(); 147 __ jmp(Address(method, entry_offset)); 148 149 __ bind(L_no_such_method); 150 __ jump(RuntimeAddress(StubRoutines::throw_AbstractMethodError_entry())); 151 } 152 153 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm, 154 Register recv, Register method_temp, 155 Register temp2, 156 bool for_compiler_entry) { 157 BLOCK_COMMENT("jump_to_lambda_form {"); 158 // This is the initial entry point of a lazy method handle. 159 // After type checking, it picks up the invoker from the LambdaForm. 160 assert_different_registers(recv, method_temp, temp2); 161 assert(recv != noreg, "required register"); 162 assert(method_temp == rbx, "required register for loading method"); 163 164 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); }); 165 166 // Load the invoker, as MH -> MH.form -> LF.vmentry 167 __ verify_oop(recv); 168 __ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes()))); 169 __ verify_oop(method_temp); 170 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes()))); 171 __ verify_oop(method_temp); 172 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes()))); 173 __ verify_oop(method_temp); 174 __ movptr(method_temp, Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::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::method_offset_in_bytes())); 336 Address vmtarget_method( rbx_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())); 337 338 Register temp1_recv_klass = temp1; 339 if (iid != vmIntrinsics::_linkToStatic) { 340 __ verify_oop(receiver_reg); 341 if (iid == vmIntrinsics::_linkToSpecial) { 342 // Don't actually load the klass; just null-check the receiver. 343 __ null_check(receiver_reg); 344 } else { 345 // load receiver klass itself 346 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes()); 347 __ load_klass(temp1_recv_klass, receiver_reg); 348 __ verify_klass_ptr(temp1_recv_klass); 349 } 350 BLOCK_COMMENT("check_receiver {"); 351 // The receiver for the MemberName must be in receiver_reg. 352 // Check the receiver against the MemberName.clazz 353 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) { 354 // Did not load it above... 355 __ load_klass(temp1_recv_klass, receiver_reg); 356 __ verify_klass_ptr(temp1_recv_klass); 357 } 358 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) { 359 Label L_ok; 360 Register temp2_defc = temp2; 361 __ load_heap_oop(temp2_defc, member_clazz); 362 load_klass_from_Class(_masm, temp2_defc); 363 __ verify_klass_ptr(temp2_defc); 364 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok); 365 // If we get here, the type check failed! 366 __ STOP("receiver class disagrees with MemberName.clazz"); 367 __ bind(L_ok); 368 } 369 BLOCK_COMMENT("} check_receiver"); 370 } 371 if (iid == vmIntrinsics::_linkToSpecial || 372 iid == vmIntrinsics::_linkToStatic) { 373 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass 374 } 375 376 // Live registers at this point: 377 // member_reg - MemberName that was the trailing argument 378 // temp1_recv_klass - klass of stacked receiver, if needed 379 // rsi/r13 - interpreter linkage (if interpreted) 380 // rcx, rdx, rsi, rdi, r8 - compiler arguments (if compiled) 381 382 Label L_incompatible_class_change_error; 383 switch (iid) { 384 case vmIntrinsics::_linkToSpecial: 385 if (VerifyMethodHandles) { 386 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3); 387 } 388 __ load_heap_oop(rbx_method, member_vmtarget); 389 __ movptr(rbx_method, vmtarget_method); 390 break; 391 392 case vmIntrinsics::_linkToStatic: 393 if (VerifyMethodHandles) { 394 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3); 395 } 396 __ load_heap_oop(rbx_method, member_vmtarget); 397 __ movptr(rbx_method, vmtarget_method); 398 break; 399 400 case vmIntrinsics::_linkToVirtual: 401 { 402 // same as TemplateTable::invokevirtual, 403 // minus the CP setup and profiling: 404 405 if (VerifyMethodHandles) { 406 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3); 407 } 408 409 // pick out the vtable index from the MemberName, and then we can discard it: 410 Register temp2_index = temp2; 411 __ movptr(temp2_index, member_vmindex); 412 413 if (VerifyMethodHandles) { 414 Label L_index_ok; 415 __ cmpl(temp2_index, 0); 416 __ jcc(Assembler::greaterEqual, L_index_ok); 417 __ STOP("no virtual index"); 418 __ BIND(L_index_ok); 419 } 420 421 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget 422 // at this point. And VerifyMethodHandles has already checked clazz, if needed. 423 424 // get target Method* & entry point 425 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rbx_method); 426 break; 427 } 428 429 case vmIntrinsics::_linkToInterface: 430 { 431 // same as TemplateTable::invokeinterface 432 // (minus the CP setup and profiling, with different argument motion) 433 if (VerifyMethodHandles) { 434 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3); 435 } 436 437 Register temp3_intf = temp3; 438 __ load_heap_oop(temp3_intf, member_clazz); 439 load_klass_from_Class(_masm, temp3_intf); 440 __ verify_klass_ptr(temp3_intf); 441 442 Register rbx_index = rbx_method; 443 __ movptr(rbx_index, member_vmindex); 444 if (VerifyMethodHandles) { 445 Label L; 446 __ cmpl(rbx_index, 0); 447 __ jcc(Assembler::greaterEqual, L); 448 __ STOP("invalid vtable index for MH.invokeInterface"); 449 __ bind(L); 450 } 451 452 // given intf, index, and recv klass, dispatch to the implementation method 453 __ lookup_interface_method(temp1_recv_klass, temp3_intf, 454 // note: next two args must be the same: 455 rbx_index, rbx_method, 456 temp2, 457 L_incompatible_class_change_error); 458 break; 459 } 460 461 default: 462 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)); 463 break; 464 } 465 466 // Live at this point: 467 // rbx_method 468 // rsi/r13 (if interpreted) 469 470 // After figuring out which concrete method to call, jump into it. 471 // Note that this works in the interpreter with no data motion. 472 // But the compiled version will require that rcx_recv be shifted out. 473 __ verify_method_ptr(rbx_method); 474 jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry); 475 476 if (iid == vmIntrinsics::_linkToInterface) { 477 __ bind(L_incompatible_class_change_error); 478 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry())); 479 } 480 } 481 } 482 483 #ifndef PRODUCT 484 void trace_method_handle_stub(const char* adaptername, 485 oop mh, 486 intptr_t* saved_regs, 487 intptr_t* entry_sp) { 488 // called as a leaf from native code: do not block the JVM! 489 bool has_mh = (strstr(adaptername, "/static") == NULL && 490 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH 491 const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx"; 492 tty->print_cr("MH %s %s=" PTR_FORMAT " sp=" PTR_FORMAT, 493 adaptername, mh_reg_name, 494 p2i(mh), p2i(entry_sp)); 495 496 if (Verbose) { 497 tty->print_cr("Registers:"); 498 const int saved_regs_count = RegisterImpl::number_of_registers; 499 for (int i = 0; i < saved_regs_count; i++) { 500 Register r = as_Register(i); 501 // The registers are stored in reverse order on the stack (by pusha). 502 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]); 503 if ((i + 1) % 4 == 0) { 504 tty->cr(); 505 } else { 506 tty->print(", "); 507 } 508 } 509 tty->cr(); 510 511 { 512 // dumping last frame with frame::describe 513 514 JavaThread* p = JavaThread::active(); 515 516 ResourceMark rm; 517 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here 518 FrameValues values; 519 520 // Note: We want to allow trace_method_handle from any call site. 521 // While trace_method_handle creates a frame, it may be entered 522 // without a PC on the stack top (e.g. not just after a call). 523 // Walking that frame could lead to failures due to that invalid PC. 524 // => carefully detect that frame when doing the stack walking 525 526 // Current C frame 527 frame cur_frame = os::current_frame(); 528 529 // Robust search of trace_calling_frame (independant of inlining). 530 // Assumes saved_regs comes from a pusha in the trace_calling_frame. 531 assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?"); 532 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame); 533 while (trace_calling_frame.fp() < saved_regs) { 534 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame); 535 } 536 537 // safely create a frame and call frame::describe 538 intptr_t *dump_sp = trace_calling_frame.sender_sp(); 539 intptr_t *dump_fp = trace_calling_frame.link(); 540 541 bool walkable = has_mh; // whether the traced frame shoud be walkable 542 543 if (walkable) { 544 // The previous definition of walkable may have to be refined 545 // if new call sites cause the next frame constructor to start 546 // failing. Alternatively, frame constructors could be 547 // modified to support the current or future non walkable 548 // frames (but this is more intrusive and is not considered as 549 // part of this RFE, which will instead use a simpler output). 550 frame dump_frame = frame(dump_sp, dump_fp); 551 dump_frame.describe(values, 1); 552 } else { 553 // Stack may not be walkable (invalid PC above FP): 554 // Add descriptions without building a Java frame to avoid issues 555 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>"); 556 values.describe(-1, dump_sp, "sp for #1"); 557 } 558 values.describe(-1, entry_sp, "raw top of stack"); 559 560 tty->print_cr("Stack layout:"); 561 values.print(p); 562 } 563 if (has_mh && mh->is_oop()) { 564 mh->print(); 565 if (java_lang_invoke_MethodHandle::is_instance(mh)) { 566 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0) 567 java_lang_invoke_MethodHandle::form(mh)->print(); 568 } 569 } 570 } 571 } 572 573 // The stub wraps the arguments in a struct on the stack to avoid 574 // dealing with the different calling conventions for passing 6 575 // arguments. 576 struct MethodHandleStubArguments { 577 const char* adaptername; 578 oopDesc* mh; 579 intptr_t* saved_regs; 580 intptr_t* entry_sp; 581 }; 582 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) { 583 trace_method_handle_stub(args->adaptername, 584 args->mh, 585 args->saved_regs, 586 args->entry_sp); 587 } 588 589 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { 590 if (!TraceMethodHandles) return; 591 BLOCK_COMMENT("trace_method_handle {"); 592 __ enter(); 593 __ andptr(rsp, -16); // align stack if needed for FPU state 594 __ pusha(); 595 __ mov(rbx, rsp); // for retreiving saved_regs 596 // Note: saved_regs must be in the entered frame for the 597 // robust stack walking implemented in trace_method_handle_stub. 598 599 // save FP result, valid at some call sites (adapter_opt_return_float, ...) 600 __ increment(rsp, -2 * wordSize); 601 if (UseSSE >= 2) { 602 __ movdbl(Address(rsp, 0), xmm0); 603 } else if (UseSSE == 1) { 604 __ movflt(Address(rsp, 0), xmm0); 605 } else { 606 __ fst_d(Address(rsp, 0)); 607 } 608 609 // Incoming state: 610 // rcx: method handle 611 // 612 // To avoid calling convention issues, build a record on the stack 613 // and pass the pointer to that instead. 614 __ push(rbp); // entry_sp (with extra align space) 615 __ push(rbx); // pusha saved_regs 616 __ push(rcx); // mh 617 __ push(rcx); // slot for adaptername 618 __ movptr(Address(rsp, 0), (intptr_t) adaptername); 619 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp); 620 __ increment(rsp, sizeof(MethodHandleStubArguments)); 621 622 if (UseSSE >= 2) { 623 __ movdbl(xmm0, Address(rsp, 0)); 624 } else if (UseSSE == 1) { 625 __ movflt(xmm0, Address(rsp, 0)); 626 } else { 627 __ fld_d(Address(rsp, 0)); 628 } 629 __ increment(rsp, 2 * wordSize); 630 631 __ popa(); 632 __ leave(); 633 BLOCK_COMMENT("} trace_method_handle"); 634 } 635 #endif //PRODUCT