1/* 2 * Copyright (c) 2008, 2016, 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// This file mirror as much as possible methodHandles_x86.cpp to ease 26// cross platform development for JSR292. 27// Last synchronization: changeset f8c9417e3571 28 29#include "precompiled.hpp" 30#include "classfile/javaClasses.inline.hpp" 31#include "interpreter/interpreter.hpp" 32#include "interpreter/interpreterRuntime.hpp" 33#include "memory/allocation.inline.hpp" 34#include "memory/resourceArea.hpp" 35#include "prims/methodHandles.hpp" 36 37#define __ _masm-> 38 39#ifdef PRODUCT 40#define BLOCK_COMMENT(str) /* nothing */ 41#else 42#define BLOCK_COMMENT(str) __ block_comment(str) 43#endif 44 45#define BIND(label) bind(label); BLOCK_COMMENT(#label ":") 46 47void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp1, Register temp2) { 48 if (VerifyMethodHandles) { 49 verify_klass(_masm, klass_reg, temp1, temp2, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), 50 "MH argument is a Class"); 51 } 52 __ ldr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes())); 53} 54 55#ifdef ASSERT 56static int check_nonzero(const char* xname, int x) { 57 assert(x != 0, "%s should be nonzero", xname); 58 return x; 59} 60#define NONZERO(x) check_nonzero(#x, x) 61#else //ASSERT 62#define NONZERO(x) (x) 63#endif //ASSERT 64 65#ifdef ASSERT 66void MethodHandles::verify_klass(MacroAssembler* _masm, 67 Register obj, Register temp1, Register temp2, SystemDictionary::WKID klass_id, 68 const char* error_message) { 69 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id); 70 KlassHandle klass = SystemDictionary::well_known_klass(klass_id); 71 Label L_ok, L_bad; 72 BLOCK_COMMENT("verify_klass {"); 73 __ verify_oop(obj); 74 __ cbz(obj, L_bad); 75 __ load_klass(temp1, obj); 76 __ lea(temp2, ExternalAddress((address) klass_addr)); 77 __ ldr(temp2, temp2); // the cmpptr on x86 dereferences the AddressLiteral (not lea) 78 __ cmp(temp1, temp2); 79 __ b(L_ok, eq); 80 intptr_t super_check_offset = klass->super_check_offset(); 81 __ ldr(temp1, Address(temp1, super_check_offset)); 82 __ cmp(temp1, temp2); 83 __ b(L_ok, eq); 84 85 __ bind(L_bad); 86 __ stop(error_message); 87 __ BIND(L_ok); 88 BLOCK_COMMENT("} verify_klass"); 89} 90 91void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) { 92 Label L; 93 BLOCK_COMMENT("verify_ref_kind {"); 94 __ ldr_u32(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes()))); 95 __ logical_shift_right(temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT); 96 __ andr(temp, temp, (unsigned)java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK); 97 __ cmp(temp, ref_kind); 98 __ b(L, eq); 99 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal); 100 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind); 101 if (ref_kind == JVM_REF_invokeVirtual || 102 ref_kind == JVM_REF_invokeSpecial) 103 // could do this for all ref_kinds, but would explode assembly code size 104 trace_method_handle(_masm, buf); 105 __ stop(buf); 106 } 107 BLOCK_COMMENT("} verify_ref_kind"); 108 __ bind(L); 109} 110 111#endif //ASSERT 112 113void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, bool for_compiler_entry) { 114 Label L_no_such_method; 115 __ cbz(Rmethod, L_no_such_method); 116 117 // Note: JVMTI overhead seems small enough compared to invocation 118 // cost and is not worth the complexity or code size overhead of 119 // supporting several variants of each adapter. 120 if (!for_compiler_entry && (JvmtiExport::can_post_interpreter_events())) { 121 // JVMTI events, such as single-stepping, are implemented partly by avoiding running 122 // compiled code in threads for which the event is enabled. Check here for 123 // interp_only_mode if these events CAN be enabled. 124 __ ldr_s32(Rtemp, Address(Rthread, JavaThread::interp_only_mode_offset())); 125#ifdef AARCH64 126 Label L; 127 __ cbz(Rtemp, L); 128 __ indirect_jump(Address(Rmethod, Method::interpreter_entry_offset()), Rtemp); 129 __ bind(L); 130#else 131 __ cmp(Rtemp, 0); 132 __ ldr(PC, Address(Rmethod, Method::interpreter_entry_offset()), ne); 133#endif // AARCH64 134 } 135 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() : 136 Method::from_interpreted_offset(); 137 138 __ indirect_jump(Address(Rmethod, entry_offset), Rtemp); 139 140 __ bind(L_no_such_method); 141 // throw exception 142 __ jump(StubRoutines::throw_AbstractMethodError_entry(), relocInfo::runtime_call_type, Rtemp); 143} 144 145void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm, 146 Register recv, Register tmp, 147 bool for_compiler_entry) { 148 BLOCK_COMMENT("jump_to_lambda_form {"); 149 // This is the initial entry point of a lazy method handle. 150 // After type checking, it picks up the invoker from the LambdaForm. 151 assert_different_registers(recv, tmp, Rmethod); 152 153 // Load the invoker, as MH -> MH.form -> LF.vmentry 154 __ load_heap_oop(tmp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes()))); 155 __ verify_oop(tmp); 156 157 __ load_heap_oop(tmp, Address(tmp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes()))); 158 __ verify_oop(tmp); 159 160 // the following assumes that a Method* is normally compressed in the vmtarget field: 161 __ ldr(Rmethod, Address(tmp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()))); 162 163 if (VerifyMethodHandles && !for_compiler_entry) { 164 // make sure recv is already on stack 165 __ ldr(tmp, Address(Rmethod, Method::const_offset())); 166 __ load_sized_value(tmp, 167 Address(tmp, ConstMethod::size_of_parameters_offset()), 168 sizeof(u2), /*is_signed*/ false); 169 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 170 Label L; 171 __ ldr(tmp, __ receiver_argument_address(Rparams, tmp, tmp)); 172 __ cmp(tmp, recv); 173 __ b(L, eq); 174 __ stop("receiver not on stack"); 175 __ bind(L); 176 } 177 178 jump_from_method_handle(_masm, for_compiler_entry); 179 BLOCK_COMMENT("} jump_to_lambda_form"); 180} 181 182 183// Code generation 184address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm, 185 vmIntrinsics::ID iid) { 186 const bool not_for_compiler_entry = false; // this is the interpreter entry 187 assert(is_signature_polymorphic(iid), "expected invoke iid"); 188 if (iid == vmIntrinsics::_invokeGeneric || 189 iid == vmIntrinsics::_compiledLambdaForm) { 190 // Perhaps surprisingly, the user-visible names, and linkToCallSite, are not directly used. 191 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod. 192 // They all require an extra argument. 193 __ should_not_reach_here(); // empty stubs make SG sick 194 return NULL; 195 } 196 197 // Rmethod: Method* 198 // Rparams (SP on 32-bit ARM): pointer to parameters 199 // Rsender_sp (R4/R19): sender SP (must preserve; see prepare_to_jump_from_interpreted) 200 // R5_mh: receiver method handle (must load from sp[MethodTypeForm.vmslots]) 201 // R1, R2, Rtemp: garbage temp, blown away 202 203 // Use same name as x86 to ease future merges 204 Register rdx_temp = R2_tmp; 205 Register rdx_param_size = rdx_temp; // size of parameters 206 Register rax_temp = R1_tmp; 207 Register rcx_mh = R5_mh; // MH receiver; dies quickly and is recycled 208 Register rbx_method = Rmethod; // eventual target of this invocation 209 Register rdi_temp = Rtemp; 210 211 // here's where control starts out: 212 __ align(CodeEntryAlignment); 213 address entry_point = __ pc(); 214 215 if (VerifyMethodHandles) { 216 Label L; 217 BLOCK_COMMENT("verify_intrinsic_id {"); 218 __ ldrh(rdi_temp, Address(rbx_method, Method::intrinsic_id_offset_in_bytes())); 219 __ sub_slow(rdi_temp, rdi_temp, (int) iid); 220 __ cbz(rdi_temp, L); 221 if (iid == vmIntrinsics::_linkToVirtual || 222 iid == vmIntrinsics::_linkToSpecial) { 223 // could do this for all kinds, but would explode assembly code size 224 trace_method_handle(_masm, "bad Method*::intrinsic_id"); 225 } 226 __ stop("bad Method*::intrinsic_id"); 227 __ bind(L); 228 BLOCK_COMMENT("} verify_intrinsic_id"); 229 } 230 231 // First task: Find out how big the argument list is. 232 Address rdx_first_arg_addr; 233 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid); 234 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic"); 235 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) { 236 __ ldr(rdx_param_size, Address(rbx_method, Method::const_offset())); 237 __ load_sized_value(rdx_param_size, 238 Address(rdx_param_size, ConstMethod::size_of_parameters_offset()), 239 sizeof(u2), /*is_signed*/ false); 240 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); 241 rdx_first_arg_addr = __ receiver_argument_address(Rparams, rdx_param_size, rdi_temp); 242 } else { 243 DEBUG_ONLY(rdx_param_size = noreg); 244 } 245 246 if (!is_signature_polymorphic_static(iid)) { 247 __ ldr(rcx_mh, rdx_first_arg_addr); 248 DEBUG_ONLY(rdx_param_size = noreg); 249 } 250 251 // rdx_first_arg_addr is live! 252 253 trace_method_handle_interpreter_entry(_masm, iid); 254 255 if (iid == vmIntrinsics::_invokeBasic) { 256 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry); 257 258 } else { 259 // Adjust argument list by popping the trailing MemberName argument. 260 Register rcx_recv = noreg; 261 if (MethodHandles::ref_kind_has_receiver(ref_kind)) { 262 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack. 263 __ ldr(rcx_recv = rcx_mh, rdx_first_arg_addr); 264 DEBUG_ONLY(rdx_param_size = noreg); 265 } 266 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now 267#ifdef AARCH64 268 __ ldr(rbx_member, Address(Rparams, Interpreter::stackElementSize, post_indexed)); 269#else 270 __ pop(rbx_member); 271#endif 272 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry); 273 } 274 return entry_point; 275} 276 277void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm, 278 vmIntrinsics::ID iid, 279 Register receiver_reg, 280 Register member_reg, 281 bool for_compiler_entry) { 282 assert(is_signature_polymorphic(iid), "expected invoke iid"); 283 // Use same name as x86 to ease future merges 284 Register rbx_method = Rmethod; // eventual target of this invocation 285 // temps used in this code are not used in *either* compiled or interpreted calling sequences 286 Register temp1 = (for_compiler_entry ? saved_last_sp_register() : R1_tmp); 287 Register temp2 = AARCH64_ONLY(R9) NOT_AARCH64(R8); 288 Register temp3 = Rtemp; // R12/R16 289 Register temp4 = AARCH64_ONLY(Rtemp2) NOT_AARCH64(R5); 290 if (for_compiler_entry) { 291 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment"); 292#ifdef AARCH64 293 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7); 294 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7); 295 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7); 296 assert_different_registers(temp4, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7); 297#else 298 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3); 299 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3); 300 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3); 301 assert_different_registers(temp4, j_rarg0, j_rarg1, j_rarg2, j_rarg3); 302#endif // AARCH64 303 } 304 assert_different_registers(temp1, temp2, temp3, receiver_reg); 305 assert_different_registers(temp1, temp2, temp3, temp4, member_reg); 306 if (!for_compiler_entry) 307 assert_different_registers(temp1, temp2, temp3, temp4, saved_last_sp_register()); // don't trash lastSP 308 309 if (iid == vmIntrinsics::_invokeBasic) { 310 // indirect through MH.form.exactInvoker.vmtarget 311 jump_to_lambda_form(_masm, receiver_reg, temp3, for_compiler_entry); 312 313 } else { 314 // The method is a member invoker used by direct method handles. 315 if (VerifyMethodHandles) { 316 // make sure the trailing argument really is a MemberName (caller responsibility) 317 verify_klass(_masm, member_reg, temp2, temp3, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName), 318 "MemberName required for invokeVirtual etc."); 319 } 320 321 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes())); 322 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes())); 323 Address member_vmtarget(member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())); 324 325 Register temp1_recv_klass = temp1; 326 if (iid != vmIntrinsics::_linkToStatic) { 327 if (iid == vmIntrinsics::_linkToSpecial) { 328 // Don't actually load the klass; just null-check the receiver. 329 __ null_check(receiver_reg, temp3); 330 } else { 331 // load receiver klass itself 332 __ null_check(receiver_reg, temp3, oopDesc::klass_offset_in_bytes()); 333 __ load_klass(temp1_recv_klass, receiver_reg); 334 __ verify_klass_ptr(temp1_recv_klass); 335 } 336 BLOCK_COMMENT("check_receiver {"); 337 // The receiver for the MemberName must be in receiver_reg. 338 // Check the receiver against the MemberName.clazz 339 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) { 340 // Did not load it above... 341 __ load_klass(temp1_recv_klass, receiver_reg); 342 __ verify_klass_ptr(temp1_recv_klass); 343 } 344 // Check the receiver against the MemberName.clazz 345 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) { 346 Label L_ok; 347 Register temp2_defc = temp2; 348 __ load_heap_oop(temp2_defc, member_clazz); 349 load_klass_from_Class(_masm, temp2_defc, temp3, temp4); 350 __ verify_klass_ptr(temp2_defc); 351#ifdef AARCH64 352 // TODO-AARCH64 353 __ b(L_ok); 354#else 355 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, noreg, L_ok); 356#endif 357 // If we get here, the type check failed! 358 __ stop("receiver class disagrees with MemberName.clazz"); 359 __ bind(L_ok); 360 } 361 BLOCK_COMMENT("} check_receiver"); 362 } 363 if (iid == vmIntrinsics::_linkToSpecial || 364 iid == vmIntrinsics::_linkToStatic) { 365 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass 366 } 367 368 // Live registers at this point: 369 // member_reg - MemberName that was the extra argument 370 // temp1_recv_klass - klass of stacked receiver, if needed 371 372 Label L_incompatible_class_change_error; 373 switch (iid) { 374 case vmIntrinsics::_linkToSpecial: 375 if (VerifyMethodHandles) { 376 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3); 377 } 378 __ ldr(Rmethod, member_vmtarget); 379 break; 380 381 case vmIntrinsics::_linkToStatic: 382 if (VerifyMethodHandles) { 383 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3); 384 } 385 __ ldr(Rmethod, member_vmtarget); 386 break; 387 388 case vmIntrinsics::_linkToVirtual: 389 { 390 // same as TemplateTable::invokevirtual, 391 // minus the CP setup and profiling: 392 393 if (VerifyMethodHandles) { 394 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3); 395 } 396 397 // pick out the vtable index from the MemberName, and then we can discard it: 398 Register temp2_index = temp2; 399 __ ldr(temp2_index, member_vmindex); 400 401 if (VerifyMethodHandles) { 402 Label L_index_ok; 403 __ cmp(temp2_index, 0); 404 __ b(L_index_ok, ge); 405 __ stop("no virtual index"); 406 __ bind(L_index_ok); 407 } 408 409 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget 410 // at this point. And VerifyMethodHandles has already checked clazz, if needed. 411 412 // get target Method* & entry point 413 __ lookup_virtual_method(temp1_recv_klass, temp2_index, Rmethod); 414 break; 415 } 416 417 case vmIntrinsics::_linkToInterface: 418 { 419 // same as TemplateTable::invokeinterface 420 // (minus the CP setup and profiling, with different argument motion) 421 if (VerifyMethodHandles) { 422 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3); 423 } 424 425 Register temp3_intf = temp3; 426 __ load_heap_oop(temp3_intf, member_clazz); 427 load_klass_from_Class(_masm, temp3_intf, temp2, temp4); 428 __ verify_klass_ptr(temp3_intf); 429 430 Register rbx_index = rbx_method; 431 __ ldr(rbx_index, member_vmindex); 432 if (VerifyMethodHandles) { 433 Label L; 434 __ cmp(rbx_index, 0); 435 __ b(L, ge); 436 __ stop("invalid vtable index for MH.invokeInterface"); 437 __ bind(L); 438 } 439 440 // given intf, index, and recv klass, dispatch to the implementation method 441 Label L_no_such_interface; 442 __ lookup_interface_method(temp1_recv_klass, temp3_intf, 443 // note: next two args must be the same: 444 rbx_index, rbx_method, 445 temp2, temp4, 446 L_incompatible_class_change_error); 447 break; 448 } 449 450 default: 451 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)); 452 break; 453 } 454 455 // Live at this point: 456 // Rmethod (target method) 457 // Rsender_sp, Rparams (if interpreted) 458 // register arguments (if compiled) 459 460 // After figuring out which concrete method to call, jump into it. 461 __ verify_method_ptr(Rmethod); 462 jump_from_method_handle(_masm, for_compiler_entry); 463 464 if (iid == vmIntrinsics::_linkToInterface) { 465 __ bind(L_incompatible_class_change_error); 466 __ jump(StubRoutines::throw_IncompatibleClassChangeError_entry(), relocInfo::runtime_call_type, Rtemp); 467 } 468 } 469} 470 471 472#ifndef PRODUCT 473enum { 474 ARG_LIMIT = 255, SLOP = 4, 475 // use this parameter for checking for garbage stack movements: 476 UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP) 477 // the slop defends against false alarms due to fencepost errors 478}; 479 480#ifdef AARCH64 481const int trace_mh_nregs = 32; // R0-R30, PC 482#else 483const int trace_mh_nregs = 15; 484const Register trace_mh_regs[trace_mh_nregs] = 485 {R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, LR, PC}; 486#endif // AARCH64 487 488void trace_method_handle_stub(const char* adaptername, 489 intptr_t* saved_regs, 490 intptr_t* saved_bp, 491 oop mh) { 492 // called as a leaf from native code: do not block the JVM! 493 bool has_mh = (strstr(adaptername, "/static") == NULL && 494 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH 495 intptr_t* entry_sp = (intptr_t*) &saved_regs[trace_mh_nregs]; // just after the saved regs 496 intptr_t* saved_sp = (intptr_t*) saved_regs[Rsender_sp->encoding()]; // save of Rsender_sp 497 intptr_t* last_sp = (intptr_t*) saved_bp[AARCH64_ONLY(frame::interpreter_frame_stack_top_offset) NOT_AARCH64(frame::interpreter_frame_last_sp_offset)]; 498 intptr_t* base_sp = last_sp; 499 500 intptr_t mh_reg = (intptr_t)saved_regs[R5_mh->encoding()]; 501 const char* mh_reg_name = "R5_mh"; 502 if (!has_mh) mh_reg_name = "R5"; 503 tty->print_cr("MH %s %s=" PTR_FORMAT " sp=(" PTR_FORMAT "+" INTX_FORMAT ") stack_size=" INTX_FORMAT " bp=" PTR_FORMAT, 504 adaptername, mh_reg_name, mh_reg, 505 (intptr_t)entry_sp, (intptr_t)saved_sp - (intptr_t)entry_sp, (intptr_t)(base_sp - last_sp), (intptr_t)saved_bp); 506 507 if (last_sp != saved_sp && last_sp != NULL) 508 tty->print_cr("*** last_sp=" INTPTR_FORMAT, p2i(last_sp)); 509 if (Verbose) { 510 tty->print(" reg dump: "); 511 int i; 512 for (i = 0; i < trace_mh_nregs; i++) { 513 if (i > 0 && i % AARCH64_ONLY(2) NOT_AARCH64(4) == 0) 514 tty->print("\n + dump: "); 515#ifdef AARCH64 516 const char* reg_name = (i == trace_mh_nregs-1) ? "pc" : as_Register(i)->name(); 517#else 518 const char* reg_name = trace_mh_regs[i]->name(); 519#endif 520 tty->print(" %s: " INTPTR_FORMAT, reg_name, p2i((void *)saved_regs[i])); 521 } 522 tty->cr(); 523 } 524 525 if (Verbose) { 526 // dump last frame (from JavaThread::print_frame_layout) 527 528 // Note: code is robust but the dumped informationm may not be 529 // 100% correct, particularly with respect to the dumped 530 // "unextended_sp". Getting it right for all trace_method_handle 531 // call paths is not worth the complexity/risk. The correct slot 532 // will be identified by *Rsender_sp anyway in the dump. 533 JavaThread* p = JavaThread::active(); 534 535 ResourceMark rm; 536 PRESERVE_EXCEPTION_MARK; 537 FrameValues values; 538 539 intptr_t* dump_fp = (intptr_t *) saved_bp; 540 address dump_pc = (address) saved_regs[trace_mh_nregs-2]; // LR (with LR,PC last in saved_regs) 541 frame dump_frame((intptr_t *)entry_sp, dump_fp, dump_pc); 542 543 dump_frame.describe(values, 1); 544 // mark Rsender_sp if seems valid 545 if (has_mh) { 546 if ((saved_sp >= entry_sp - UNREASONABLE_STACK_MOVE) && (saved_sp < dump_fp)) { 547 values.describe(-1, saved_sp, "*Rsender_sp"); 548 } 549 } 550 551 // Note: the unextended_sp may not be correct 552 tty->print_cr(" stack layout:"); 553 values.print(p); 554 } 555 if (Verbose) { 556 if (has_mh && mh->is_oop()) { 557 mh->print(); 558 if (java_lang_invoke_MethodHandle::is_instance(mh)) { 559 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0) 560 java_lang_invoke_MethodHandle::form(mh)->print(); 561 } 562 } 563 } 564} 565 566void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { 567 if (!TraceMethodHandles) return; 568 BLOCK_COMMENT("trace_method_handle {"); 569 // register saving 570 // must correspond to trace_mh_nregs and trace_mh_regs defined above 571 int push_size = __ save_all_registers(); 572 assert(trace_mh_nregs*wordSize == push_size,"saved register count mismatch"); 573 574 __ mov_slow(R0, adaptername); 575 __ mov(R1, SP); // entry_sp (after pushes) 576 __ mov(R2, FP); 577 if (R5_mh != R3) { 578 assert_different_registers(R0, R1, R2, R5_mh); 579 __ mov(R3, R5_mh); 580 } 581 582 __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub), R0, R1, R2, R3); 583 584 __ restore_all_registers(); 585 BLOCK_COMMENT("} trace_method_handle"); 586} 587#endif //PRODUCT 588