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/jvm.h" 33#include "prims/methodHandles.hpp" 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 47void 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 55static int check_nonzero(const char* xname, int x) { 56 assert(x != 0, "%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 65void MethodHandles::verify_klass(MacroAssembler* _masm, 66 Register obj, SystemDictionary::WKID klass_id, 67 const char* error_message) { 68 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id); 69 Klass* 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 95void 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 117void 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 154void 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 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes()))); 174 __ verify_oop(method_temp); 175 __ movptr(method_temp, Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes()))); 176 177 if (VerifyMethodHandles && !for_compiler_entry) { 178 // make sure recv is already on stack 179 __ movptr(temp2, Address(method_temp, Method::const_offset())); 180 __ load_sized_value(temp2, 181 Address(temp2, ConstMethod::size_of_parameters_offset()), 182 sizeof(u2), /*is_signed*/ false); 183 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 184 Label L; 185 __ cmpptr(recv, __ argument_address(temp2, -1)); 186 __ jcc(Assembler::equal, L); 187 __ movptr(rax, __ argument_address(temp2, -1)); 188 __ STOP("receiver not on stack"); 189 __ BIND(L); 190 } 191 192 jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry); 193 BLOCK_COMMENT("} jump_to_lambda_form"); 194} 195 196 197// Code generation 198address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm, 199 vmIntrinsics::ID iid) { 200 const bool not_for_compiler_entry = false; // this is the interpreter entry 201 assert(is_signature_polymorphic(iid), "expected invoke iid"); 202 if (iid == vmIntrinsics::_invokeGeneric || 203 iid == vmIntrinsics::_compiledLambdaForm) { 204 // Perhaps surprisingly, the symbolic references visible to Java are not directly used. 205 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod. 206 // They all allow an appendix argument. 207 __ hlt(); // empty stubs make SG sick 208 return NULL; 209 } 210 211 // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted) 212 // rbx: Method* 213 // rdx: argument locator (parameter slot count, added to rsp) 214 // rcx: used as temp to hold mh or receiver 215 // rax, rdi: garbage temps, blown away 216 Register rdx_argp = rdx; // argument list ptr, live on error paths 217 Register rax_temp = rax; 218 Register rcx_mh = rcx; // MH receiver; dies quickly and is recycled 219 Register rbx_method = rbx; // eventual target of this invocation 220 221 // here's where control starts out: 222 __ align(CodeEntryAlignment); 223 address entry_point = __ pc(); 224 225 if (VerifyMethodHandles) { 226 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2"); 227 228 Label L; 229 BLOCK_COMMENT("verify_intrinsic_id {"); 230 __ cmpw(Address(rbx_method, Method::intrinsic_id_offset_in_bytes()), (int) iid); 231 __ jcc(Assembler::equal, L); 232 if (iid == vmIntrinsics::_linkToVirtual || 233 iid == vmIntrinsics::_linkToSpecial) { 234 // could do this for all kinds, but would explode assembly code size 235 trace_method_handle(_masm, "bad Method*::intrinsic_id"); 236 } 237 __ STOP("bad Method*::intrinsic_id"); 238 __ bind(L); 239 BLOCK_COMMENT("} verify_intrinsic_id"); 240 } 241 242 // First task: Find out how big the argument list is. 243 Address rdx_first_arg_addr; 244 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid); 245 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic"); 246 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) { 247 __ movptr(rdx_argp, Address(rbx_method, Method::const_offset())); 248 __ load_sized_value(rdx_argp, 249 Address(rdx_argp, ConstMethod::size_of_parameters_offset()), 250 sizeof(u2), /*is_signed*/ false); 251 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 252 rdx_first_arg_addr = __ argument_address(rdx_argp, -1); 253 } else { 254 DEBUG_ONLY(rdx_argp = noreg); 255 } 256 257 if (!is_signature_polymorphic_static(iid)) { 258 __ movptr(rcx_mh, rdx_first_arg_addr); 259 DEBUG_ONLY(rdx_argp = noreg); 260 } 261 262 // rdx_first_arg_addr is live! 263 264 trace_method_handle_interpreter_entry(_masm, iid); 265 266 if (iid == vmIntrinsics::_invokeBasic) { 267 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry); 268 269 } else { 270 // Adjust argument list by popping the trailing MemberName argument. 271 Register rcx_recv = noreg; 272 if (MethodHandles::ref_kind_has_receiver(ref_kind)) { 273 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack. 274 __ movptr(rcx_recv = rcx, rdx_first_arg_addr); 275 } 276 DEBUG_ONLY(rdx_argp = noreg); 277 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now 278 __ pop(rax_temp); // return address 279 __ pop(rbx_member); // extract last argument 280 __ push(rax_temp); // re-push return address 281 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry); 282 } 283 284 return entry_point; 285} 286 287void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm, 288 vmIntrinsics::ID iid, 289 Register receiver_reg, 290 Register member_reg, 291 bool for_compiler_entry) { 292 assert(is_signature_polymorphic(iid), "expected invoke iid"); 293 Register rbx_method = rbx; // eventual target of this invocation 294 // temps used in this code are not used in *either* compiled or interpreted calling sequences 295#ifdef _LP64 296 Register temp1 = rscratch1; 297 Register temp2 = rscratch2; 298 Register temp3 = rax; 299 if (for_compiler_entry) { 300 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment"); 301 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5); 302 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5); 303 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5); 304 } 305#else 306 Register temp1 = (for_compiler_entry ? rsi : rdx); 307 Register temp2 = rdi; 308 Register temp3 = rax; 309 if (for_compiler_entry) { 310 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment"); 311 assert_different_registers(temp1, rcx, rdx); 312 assert_different_registers(temp2, rcx, rdx); 313 assert_different_registers(temp3, rcx, rdx); 314 } 315#endif 316 else { 317 assert_different_registers(temp1, temp2, temp3, saved_last_sp_register()); // don't trash lastSP 318 } 319 assert_different_registers(temp1, temp2, temp3, receiver_reg); 320 assert_different_registers(temp1, temp2, temp3, member_reg); 321 322 if (iid == vmIntrinsics::_invokeBasic) { 323 // indirect through MH.form.vmentry.vmtarget 324 jump_to_lambda_form(_masm, receiver_reg, rbx_method, temp1, for_compiler_entry); 325 326 } else { 327 // The method is a member invoker used by direct method handles. 328 if (VerifyMethodHandles) { 329 // make sure the trailing argument really is a MemberName (caller responsibility) 330 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName), 331 "MemberName required for invokeVirtual etc."); 332 } 333 334 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes())); 335 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes())); 336 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())); 337 Address vmtarget_method( rbx_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())); 338 339 Register temp1_recv_klass = temp1; 340 if (iid != vmIntrinsics::_linkToStatic) { 341 __ verify_oop(receiver_reg); 342 if (iid == vmIntrinsics::_linkToSpecial) { 343 // Don't actually load the klass; just null-check the receiver. 344 __ null_check(receiver_reg); 345 } else { 346 // load receiver klass itself 347 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes()); 348 __ load_klass(temp1_recv_klass, receiver_reg); 349 __ verify_klass_ptr(temp1_recv_klass); 350 } 351 BLOCK_COMMENT("check_receiver {"); 352 // The receiver for the MemberName must be in receiver_reg. 353 // Check the receiver against the MemberName.clazz 354 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) { 355 // Did not load it above... 356 __ load_klass(temp1_recv_klass, receiver_reg); 357 __ verify_klass_ptr(temp1_recv_klass); 358 } 359 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) { 360 Label L_ok; 361 Register temp2_defc = temp2; 362 __ load_heap_oop(temp2_defc, member_clazz); 363 load_klass_from_Class(_masm, temp2_defc); 364 __ verify_klass_ptr(temp2_defc); 365 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok); 366 // If we get here, the type check failed! 367 __ STOP("receiver class disagrees with MemberName.clazz"); 368 __ bind(L_ok); 369 } 370 BLOCK_COMMENT("} check_receiver"); 371 } 372 if (iid == vmIntrinsics::_linkToSpecial || 373 iid == vmIntrinsics::_linkToStatic) { 374 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass 375 } 376 377 // Live registers at this point: 378 // member_reg - MemberName that was the trailing argument 379 // temp1_recv_klass - klass of stacked receiver, if needed 380 // rsi/r13 - interpreter linkage (if interpreted) 381 // rcx, rdx, rsi, rdi, r8 - compiler arguments (if compiled) 382 383 Label L_incompatible_class_change_error; 384 switch (iid) { 385 case vmIntrinsics::_linkToSpecial: 386 if (VerifyMethodHandles) { 387 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3); 388 } 389 __ load_heap_oop(rbx_method, member_vmtarget); 390 __ movptr(rbx_method, vmtarget_method); 391 break; 392 393 case vmIntrinsics::_linkToStatic: 394 if (VerifyMethodHandles) { 395 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3); 396 } 397 __ load_heap_oop(rbx_method, member_vmtarget); 398 __ movptr(rbx_method, vmtarget_method); 399 break; 400 401 case vmIntrinsics::_linkToVirtual: 402 { 403 // same as TemplateTable::invokevirtual, 404 // minus the CP setup and profiling: 405 406 if (VerifyMethodHandles) { 407 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3); 408 } 409 410 // pick out the vtable index from the MemberName, and then we can discard it: 411 Register temp2_index = temp2; 412 __ movptr(temp2_index, member_vmindex); 413 414 if (VerifyMethodHandles) { 415 Label L_index_ok; 416 __ cmpl(temp2_index, 0); 417 __ jcc(Assembler::greaterEqual, L_index_ok); 418 __ STOP("no virtual index"); 419 __ BIND(L_index_ok); 420 } 421 422 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget 423 // at this point. And VerifyMethodHandles has already checked clazz, if needed. 424 425 // get target Method* & entry point 426 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rbx_method); 427 break; 428 } 429 430 case vmIntrinsics::_linkToInterface: 431 { 432 // same as TemplateTable::invokeinterface 433 // (minus the CP setup and profiling, with different argument motion) 434 if (VerifyMethodHandles) { 435 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3); 436 } 437 438 Register temp3_intf = temp3; 439 __ load_heap_oop(temp3_intf, member_clazz); 440 load_klass_from_Class(_masm, temp3_intf); 441 __ verify_klass_ptr(temp3_intf); 442 443 Register rbx_index = rbx_method; 444 __ movptr(rbx_index, member_vmindex); 445 if (VerifyMethodHandles) { 446 Label L; 447 __ cmpl(rbx_index, 0); 448 __ jcc(Assembler::greaterEqual, L); 449 __ STOP("invalid vtable index for MH.invokeInterface"); 450 __ bind(L); 451 } 452 453 // given intf, index, and recv klass, dispatch to the implementation method 454 __ lookup_interface_method(temp1_recv_klass, temp3_intf, 455 // note: next two args must be the same: 456 rbx_index, rbx_method, 457 temp2, 458 L_incompatible_class_change_error); 459 break; 460 } 461 462 default: 463 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)); 464 break; 465 } 466 467 // Live at this point: 468 // rbx_method 469 // rsi/r13 (if interpreted) 470 471 // After figuring out which concrete method to call, jump into it. 472 // Note that this works in the interpreter with no data motion. 473 // But the compiled version will require that rcx_recv be shifted out. 474 __ verify_method_ptr(rbx_method); 475 jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry); 476 477 if (iid == vmIntrinsics::_linkToInterface) { 478 __ bind(L_incompatible_class_change_error); 479 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry())); 480 } 481 } 482} 483 484#ifndef PRODUCT 485void trace_method_handle_stub(const char* adaptername, 486 oop mh, 487 intptr_t* saved_regs, 488 intptr_t* entry_sp) { 489 // called as a leaf from native code: do not block the JVM! 490 bool has_mh = (strstr(adaptername, "/static") == NULL && 491 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH 492 const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx"; 493 tty->print_cr("MH %s %s=" PTR_FORMAT " sp=" PTR_FORMAT, 494 adaptername, mh_reg_name, 495 p2i(mh), p2i(entry_sp)); 496 497 if (Verbose) { 498 tty->print_cr("Registers:"); 499 const int saved_regs_count = RegisterImpl::number_of_registers; 500 for (int i = 0; i < saved_regs_count; i++) { 501 Register r = as_Register(i); 502 // The registers are stored in reverse order on the stack (by pusha). 503 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]); 504 if ((i + 1) % 4 == 0) { 505 tty->cr(); 506 } else { 507 tty->print(", "); 508 } 509 } 510 tty->cr(); 511 512 { 513 // dumping last frame with frame::describe 514 515 JavaThread* p = JavaThread::active(); 516 517 ResourceMark rm; 518 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here 519 FrameValues values; 520 521 // Note: We want to allow trace_method_handle from any call site. 522 // While trace_method_handle creates a frame, it may be entered 523 // without a PC on the stack top (e.g. not just after a call). 524 // Walking that frame could lead to failures due to that invalid PC. 525 // => carefully detect that frame when doing the stack walking 526 527 // Current C frame 528 frame cur_frame = os::current_frame(); 529 530 // Robust search of trace_calling_frame (independant of inlining). 531 // Assumes saved_regs comes from a pusha in the trace_calling_frame. 532 assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?"); 533 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame); 534 while (trace_calling_frame.fp() < saved_regs) { 535 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame); 536 } 537 538 // safely create a frame and call frame::describe 539 intptr_t *dump_sp = trace_calling_frame.sender_sp(); 540 intptr_t *dump_fp = trace_calling_frame.link(); 541 542 bool walkable = has_mh; // whether the traced frame shoud be walkable 543 544 if (walkable) { 545 // The previous definition of walkable may have to be refined 546 // if new call sites cause the next frame constructor to start 547 // failing. Alternatively, frame constructors could be 548 // modified to support the current or future non walkable 549 // frames (but this is more intrusive and is not considered as 550 // part of this RFE, which will instead use a simpler output). 551 frame dump_frame = frame(dump_sp, dump_fp); 552 dump_frame.describe(values, 1); 553 } else { 554 // Stack may not be walkable (invalid PC above FP): 555 // Add descriptions without building a Java frame to avoid issues 556 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>"); 557 values.describe(-1, dump_sp, "sp for #1"); 558 } 559 values.describe(-1, entry_sp, "raw top of stack"); 560 561 tty->print_cr("Stack layout:"); 562 values.print(p); 563 } 564 if (has_mh && oopDesc::is_oop(mh)) { 565 mh->print(); 566 if (java_lang_invoke_MethodHandle::is_instance(mh)) { 567 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0) 568 java_lang_invoke_MethodHandle::form(mh)->print(); 569 } 570 } 571 } 572} 573 574// The stub wraps the arguments in a struct on the stack to avoid 575// dealing with the different calling conventions for passing 6 576// arguments. 577struct MethodHandleStubArguments { 578 const char* adaptername; 579 oopDesc* mh; 580 intptr_t* saved_regs; 581 intptr_t* entry_sp; 582}; 583void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) { 584 trace_method_handle_stub(args->adaptername, 585 args->mh, 586 args->saved_regs, 587 args->entry_sp); 588} 589 590void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { 591 if (!TraceMethodHandles) return; 592 BLOCK_COMMENT("trace_method_handle {"); 593 __ enter(); 594 __ andptr(rsp, -16); // align stack if needed for FPU state 595 __ pusha(); 596 __ mov(rbx, rsp); // for retreiving saved_regs 597 // Note: saved_regs must be in the entered frame for the 598 // robust stack walking implemented in trace_method_handle_stub. 599 600 // save FP result, valid at some call sites (adapter_opt_return_float, ...) 601 __ increment(rsp, -2 * wordSize); 602 if (UseSSE >= 2) { 603 __ movdbl(Address(rsp, 0), xmm0); 604 } else if (UseSSE == 1) { 605 __ movflt(Address(rsp, 0), xmm0); 606 } else { 607 __ fst_d(Address(rsp, 0)); 608 } 609 610 // Incoming state: 611 // rcx: method handle 612 // 613 // To avoid calling convention issues, build a record on the stack 614 // and pass the pointer to that instead. 615 __ push(rbp); // entry_sp (with extra align space) 616 __ push(rbx); // pusha saved_regs 617 __ push(rcx); // mh 618 __ push(rcx); // slot for adaptername 619 __ movptr(Address(rsp, 0), (intptr_t) adaptername); 620 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp); 621 __ increment(rsp, sizeof(MethodHandleStubArguments)); 622 623 if (UseSSE >= 2) { 624 __ movdbl(xmm0, Address(rsp, 0)); 625 } else if (UseSSE == 1) { 626 __ movflt(xmm0, Address(rsp, 0)); 627 } else { 628 __ fld_d(Address(rsp, 0)); 629 } 630 __ increment(rsp, 2 * wordSize); 631 632 __ popa(); 633 __ leave(); 634 BLOCK_COMMENT("} trace_method_handle"); 635} 636#endif //PRODUCT 637