1 /* 2 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2012, 2021 SAP SE. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "jvm.h" 28 #include "asm/macroAssembler.inline.hpp" 29 #include "classfile/javaClasses.inline.hpp" 30 #include "classfile/vmClasses.hpp" 31 #include "interpreter/interpreter.hpp" 32 #include "logging/log.hpp" 33 #include "logging/logStream.hpp" 34 #include "memory/allocation.inline.hpp" 35 #include "memory/resourceArea.hpp" 36 #include "prims/jvmtiExport.hpp" 37 #include "prims/methodHandles.hpp" 38 #include "runtime/frame.inline.hpp" 39 #include "runtime/stubRoutines.hpp" 40 #include "utilities/macros.hpp" 41 #include "utilities/preserveException.hpp" 42 43 #define __ _masm-> 44 45 #ifdef PRODUCT 46 #define BLOCK_COMMENT(str) // nothing 47 #else 48 #define BLOCK_COMMENT(str) __ block_comment(str) 49 #endif 50 51 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") 52 53 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant. 54 inline static RegisterOrConstant constant(int value) { 55 return RegisterOrConstant(value); 56 } 57 58 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, 59 Register temp_reg, Register temp2_reg) { 60 if (VerifyMethodHandles) { 61 verify_klass(_masm, klass_reg, VM_CLASS_ID(java_lang_Class), 62 temp_reg, temp2_reg, "MH argument is a Class"); 63 } 64 __ ld(klass_reg, java_lang_Class::klass_offset(), klass_reg); 65 } 66 67 #ifdef ASSERT 68 static int check_nonzero(const char* xname, int x) { 69 assert(x != 0, "%s should be nonzero", xname); 70 return x; 71 } 72 #define NONZERO(x) check_nonzero(#x, x) 73 #else //ASSERT 74 #define NONZERO(x) (x) 75 #endif //ASSERT 76 77 #ifdef ASSERT 78 void MethodHandles::verify_klass(MacroAssembler* _masm, 79 Register obj_reg, vmClassID klass_id, 80 Register temp_reg, Register temp2_reg, 81 const char* error_message) { 82 InstanceKlass** klass_addr = vmClasses::klass_addr_at(klass_id); 83 Klass* klass = vmClasses::klass_at(klass_id); 84 Label L_ok, L_bad; 85 BLOCK_COMMENT("verify_klass {"); 86 __ verify_oop(obj_reg, FILE_AND_LINE); 87 __ cmpdi(CCR0, obj_reg, 0); 88 __ beq(CCR0, L_bad); 89 __ load_klass(temp_reg, obj_reg); 90 __ load_const_optimized(temp2_reg, (address) klass_addr); 91 __ ld(temp2_reg, 0, temp2_reg); 92 __ cmpd(CCR0, temp_reg, temp2_reg); 93 __ beq(CCR0, L_ok); 94 __ ld(temp_reg, klass->super_check_offset(), temp_reg); 95 __ cmpd(CCR0, temp_reg, temp2_reg); 96 __ beq(CCR0, L_ok); 97 __ BIND(L_bad); 98 __ stop(error_message); 99 __ BIND(L_ok); 100 BLOCK_COMMENT("} verify_klass"); 101 } 102 103 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) { 104 Label L; 105 BLOCK_COMMENT("verify_ref_kind {"); 106 __ load_sized_value(temp, NONZERO(java_lang_invoke_MemberName::flags_offset()), member_reg, 107 sizeof(u4), /*is_signed*/ false); 108 // assert(sizeof(u4) == sizeof(java.lang.invoke.MemberName.flags), ""); 109 __ srwi( temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT); 110 __ andi(temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK); 111 __ cmpwi(CCR1, temp, ref_kind); 112 __ beq(CCR1, L); 113 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal); 114 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind); 115 if (ref_kind == JVM_REF_invokeVirtual || 116 ref_kind == JVM_REF_invokeSpecial) 117 // could do this for all ref_kinds, but would explode assembly code size 118 trace_method_handle(_masm, buf); 119 __ stop(buf); 120 } 121 BLOCK_COMMENT("} verify_ref_kind"); 122 __ BIND(L); 123 } 124 125 #endif // ASSERT 126 127 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp, 128 bool for_compiler_entry) { 129 Label L_no_such_method; 130 assert(method == R19_method, "interpreter calling convention"); 131 assert_different_registers(method, target, temp); 132 133 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) { 134 Label run_compiled_code; 135 // JVMTI events, such as single-stepping, are implemented partly by avoiding running 136 // compiled code in threads for which the event is enabled. Check here for 137 // interp_only_mode if these events CAN be enabled. 138 __ verify_thread(); 139 __ lwz(temp, in_bytes(JavaThread::interp_only_mode_offset()), R16_thread); 140 __ cmplwi(CCR0, temp, 0); 141 __ beq(CCR0, run_compiled_code); 142 // Null method test is replicated below in compiled case, 143 // it might be able to address across the verify_thread() 144 __ cmplwi(CCR0, R19_method, 0); 145 __ beq(CCR0, L_no_such_method); 146 __ ld(target, in_bytes(Method::interpreter_entry_offset()), R19_method); 147 __ mtctr(target); 148 __ bctr(); 149 __ BIND(run_compiled_code); 150 } 151 152 // Compiled case, either static or fall-through from runtime conditional 153 __ cmplwi(CCR0, R19_method, 0); 154 __ beq(CCR0, L_no_such_method); 155 156 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() : 157 Method::from_interpreted_offset(); 158 __ ld(target, in_bytes(entry_offset), R19_method); 159 __ mtctr(target); 160 __ bctr(); 161 162 __ bind(L_no_such_method); 163 assert(StubRoutines::throw_AbstractMethodError_entry() != NULL, "not yet generated!"); 164 __ load_const_optimized(target, StubRoutines::throw_AbstractMethodError_entry()); 165 __ mtctr(target); 166 __ bctr(); 167 } 168 169 170 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm, 171 Register recv, Register method_temp, 172 Register temp2, Register temp3, 173 bool for_compiler_entry) { 174 BLOCK_COMMENT("jump_to_lambda_form {"); 175 // This is the initial entry point of a lazy method handle. 176 // After type checking, it picks up the invoker from the LambdaForm. 177 assert_different_registers(recv, method_temp, temp2, temp3); 178 assert(method_temp == R19_method, "required register for loading method"); 179 180 // Load the invoker, as MH -> MH.form -> LF.vmentry 181 __ verify_oop(recv, FILE_AND_LINE); 182 183 const MacroAssembler::PreservationLevel preservation_level = for_compiler_entry 184 ? MacroAssembler::PRESERVATION_FRAME_LR_GP_FP_REGS 185 : MacroAssembler::PRESERVATION_FRAME_LR; 186 187 __ load_heap_oop(method_temp, NONZERO(java_lang_invoke_MethodHandle::form_offset()), recv, 188 temp2, temp3, preservation_level, IS_NOT_NULL); 189 __ verify_oop(method_temp, FILE_AND_LINE); 190 __ load_heap_oop(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset()), method_temp, 191 temp2, temp3, preservation_level, IS_NOT_NULL); 192 __ verify_oop(method_temp, FILE_AND_LINE); 193 __ load_heap_oop(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset()), method_temp, 194 temp2, temp3, preservation_level, IS_NOT_NULL); 195 __ verify_oop(method_temp, FILE_AND_LINE); 196 __ ld(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset()), method_temp); 197 198 if (VerifyMethodHandles && !for_compiler_entry) { 199 // Make sure recv is already on stack. 200 __ ld(temp2, in_bytes(Method::const_offset()), method_temp); 201 __ load_sized_value(temp2, in_bytes(ConstMethod::size_of_parameters_offset()), temp2, 202 sizeof(u2), /*is_signed*/ false); 203 // assert(sizeof(u2) == sizeof(ConstMethod::_size_of_parameters), ""); 204 Label L; 205 __ ld(temp2, __ argument_offset(temp2, temp2, 0), R15_esp); 206 __ cmpd(CCR1, temp2, recv); 207 __ beq(CCR1, L); 208 __ stop("receiver not on stack"); 209 __ BIND(L); 210 } 211 212 jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry); 213 BLOCK_COMMENT("} jump_to_lambda_form"); 214 } 215 216 217 218 // Code generation 219 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm, 220 vmIntrinsics::ID iid) { 221 const bool not_for_compiler_entry = false; // this is the interpreter entry 222 assert(is_signature_polymorphic(iid), "expected invoke iid"); 223 if (iid == vmIntrinsics::_invokeGeneric || 224 iid == vmIntrinsics::_compiledLambdaForm) { 225 // Perhaps surprisingly, the symbolic references visible to Java are not directly used. 226 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod. 227 // They all allow an appendix argument. 228 __ stop("Should not reach here"); // empty stubs make SG sick 229 return NULL; 230 } 231 232 // No need in interpreter entry for linkToNative for now. 233 // Interpreter calls compiled entry through i2c. 234 if (iid == vmIntrinsics::_linkToNative) { 235 __ stop("Should not reach here"); // empty stubs make SG sick 236 return NULL; 237 } 238 239 Register R15_argbase = R15_esp; // parameter (preserved) 240 Register R30_tmp1 = R30; 241 Register R7_param_size = R7; 242 243 // here's where control starts out: 244 __ align(CodeEntryAlignment); 245 address entry_point = __ pc(); 246 247 if (VerifyMethodHandles) { 248 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2"); 249 250 Label L; 251 BLOCK_COMMENT("verify_intrinsic_id {"); 252 __ load_sized_value(R30_tmp1, Method::intrinsic_id_offset_in_bytes(), R19_method, 253 sizeof(u2), /*is_signed*/ false); 254 __ cmpwi(CCR1, R30_tmp1, (int) iid); 255 __ beq(CCR1, L); 256 if (iid == vmIntrinsics::_linkToVirtual || 257 iid == vmIntrinsics::_linkToSpecial) { 258 // could do this for all kinds, but would explode assembly code size 259 trace_method_handle(_masm, "bad Method*:intrinsic_id"); 260 } 261 __ stop("bad Method*::intrinsic_id"); 262 __ BIND(L); 263 BLOCK_COMMENT("} verify_intrinsic_id"); 264 } 265 266 // First task: Find out how big the argument list is. 267 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid); 268 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic"); 269 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) { 270 __ ld(R7_param_size, in_bytes(Method::const_offset()), R19_method); 271 __ load_sized_value(R7_param_size, in_bytes(ConstMethod::size_of_parameters_offset()), R7_param_size, 272 sizeof(u2), /*is_signed*/ false); 273 // assert(sizeof(u2) == sizeof(ConstMethod::_size_of_parameters), ""); 274 } else { 275 DEBUG_ONLY(R7_param_size = noreg); 276 } 277 278 Register tmp_mh = noreg; 279 if (!is_signature_polymorphic_static(iid)) { 280 __ ld(tmp_mh = R30_tmp1, __ argument_offset(R7_param_size, R7_param_size, 0), R15_argbase); 281 DEBUG_ONLY(R7_param_size = noreg); 282 } 283 284 if (log_is_enabled(Info, methodhandles)) { 285 if (tmp_mh != noreg) { 286 __ mr(R23_method_handle, tmp_mh); // make stub happy 287 } 288 trace_method_handle_interpreter_entry(_masm, iid); 289 } 290 291 if (iid == vmIntrinsics::_invokeBasic) { 292 generate_method_handle_dispatch(_masm, iid, tmp_mh, noreg, not_for_compiler_entry); 293 294 } else { 295 // Adjust argument list by popping the trailing MemberName argument. 296 Register tmp_recv = noreg; 297 if (MethodHandles::ref_kind_has_receiver(ref_kind)) { 298 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack. 299 __ ld(tmp_recv = R30_tmp1, __ argument_offset(R7_param_size, R7_param_size, 0), R15_argbase); 300 DEBUG_ONLY(R7_param_size = noreg); 301 } 302 Register R19_member = R19_method; // MemberName ptr; incoming method ptr is dead now 303 __ ld(R19_member, RegisterOrConstant((intptr_t)8), R15_argbase); 304 __ add(R15_argbase, Interpreter::stackElementSize, R15_argbase); 305 generate_method_handle_dispatch(_masm, iid, tmp_recv, R19_member, not_for_compiler_entry); 306 } 307 308 return entry_point; 309 } 310 311 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm, 312 vmIntrinsics::ID iid, 313 Register receiver_reg, 314 Register member_reg, 315 bool for_compiler_entry) { 316 assert(is_signature_polymorphic(iid), "expected invoke iid"); 317 Register temp1 = (for_compiler_entry ? R25_tmp5 : R31); // must be non-volatile due to runtime calls 318 Register temp2 = (for_compiler_entry ? R22_tmp2 : R8); 319 Register temp3 = (for_compiler_entry ? R23_tmp3 : R9); 320 Register temp4 = (for_compiler_entry ? R24_tmp4 : R10); 321 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg); 322 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg); 323 324 const MacroAssembler::PreservationLevel preservation_level = for_compiler_entry 325 ? MacroAssembler::PRESERVATION_FRAME_LR_GP_FP_REGS 326 : MacroAssembler::PRESERVATION_FRAME_LR; 327 328 if (iid == vmIntrinsics::_invokeBasic || iid == vmIntrinsics::_linkToNative) { 329 if (iid == vmIntrinsics::_linkToNative) { 330 assert(for_compiler_entry, "only compiler entry is supported"); 331 } 332 // indirect through MH.form.vmentry.vmtarget 333 jump_to_lambda_form(_masm, receiver_reg, R19_method, temp1, temp2, for_compiler_entry); 334 } else { 335 // The method is a member invoker used by direct method handles. 336 if (VerifyMethodHandles) { 337 // make sure the trailing argument really is a MemberName (caller responsibility) 338 verify_klass(_masm, member_reg, VM_CLASS_ID(MemberName_klass), 339 temp1, temp2, 340 "MemberName required for invokeVirtual etc."); 341 } 342 343 Register temp1_recv_klass = temp1; 344 if (iid != vmIntrinsics::_linkToStatic) { 345 BLOCK_COMMENT("check_receiver {"); 346 __ verify_oop(receiver_reg, FILE_AND_LINE); 347 348 const int klass_offset = iid == vmIntrinsics::_linkToSpecial 349 ? -1 // enforce receiver null check 350 : oopDesc::klass_offset_in_bytes(); // regular null-checking behavior 351 352 __ null_check_throw(receiver_reg, klass_offset, temp1, Interpreter::throw_NullPointerException_entry()); 353 354 if (iid != vmIntrinsics::_linkToSpecial || VerifyMethodHandles) { 355 __ load_klass(temp1_recv_klass, receiver_reg); 356 __ verify_klass_ptr(temp1_recv_klass); 357 } 358 359 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) { 360 Label L_ok; 361 Register temp2_defc = temp2; 362 363 __ load_heap_oop(temp2_defc, NONZERO(java_lang_invoke_MemberName::clazz_offset()), member_reg, 364 temp3, temp4, preservation_level, IS_NOT_NULL); 365 load_klass_from_Class(_masm, temp2_defc, temp3, temp4); 366 __ verify_klass_ptr(temp2_defc); 367 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok); 368 // If we get here, the type check failed! 369 __ stop("receiver class disagrees with MemberName.clazz"); 370 __ BIND(L_ok); 371 } 372 BLOCK_COMMENT("} check_receiver"); 373 } 374 if (iid == vmIntrinsics::_linkToSpecial || 375 iid == vmIntrinsics::_linkToStatic) { 376 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass 377 } 378 379 // Live registers at this point: 380 // member_reg - MemberName that was the trailing argument 381 // temp1_recv_klass - klass of stacked receiver, if needed 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, temp2); 388 } 389 __ load_heap_oop(R19_method, NONZERO(java_lang_invoke_MemberName::method_offset()), member_reg, 390 temp3, temp4, preservation_level, IS_NOT_NULL); 391 __ ld(R19_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset()), R19_method); 392 break; 393 394 case vmIntrinsics::_linkToStatic: 395 if (VerifyMethodHandles) { 396 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2); 397 } 398 __ load_heap_oop(R19_method, NONZERO(java_lang_invoke_MemberName::method_offset()), member_reg, 399 temp3, temp4, preservation_level, IS_NOT_NULL); 400 __ ld(R19_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset()), R19_method); 401 break; 402 403 case vmIntrinsics::_linkToVirtual: 404 { 405 // same as TemplateTable::invokevirtual, 406 // minus the CP setup and profiling: 407 408 if (VerifyMethodHandles) { 409 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2); 410 } 411 412 // pick out the vtable index from the MemberName, and then we can discard it: 413 Register temp2_index = temp2; 414 __ ld(temp2_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset()), member_reg); 415 416 if (VerifyMethodHandles) { 417 Label L_index_ok; 418 __ cmpdi(CCR1, temp2_index, 0); 419 __ bge(CCR1, L_index_ok); 420 __ stop("no virtual index"); 421 __ BIND(L_index_ok); 422 } 423 424 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget 425 // at this point. And VerifyMethodHandles has already checked clazz, if needed. 426 427 // get target Method* & entry point 428 __ lookup_virtual_method(temp1_recv_klass, temp2_index, R19_method); 429 break; 430 } 431 432 case vmIntrinsics::_linkToInterface: 433 { 434 // same as TemplateTable::invokeinterface 435 // (minus the CP setup and profiling, with different argument motion) 436 if (VerifyMethodHandles) { 437 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2); 438 } 439 440 Register temp2_intf = temp2; 441 __ load_heap_oop(temp2_intf, NONZERO(java_lang_invoke_MemberName::clazz_offset()), member_reg, 442 temp3, temp4, preservation_level, IS_NOT_NULL); 443 load_klass_from_Class(_masm, temp2_intf, temp3, temp4); 444 __ verify_klass_ptr(temp2_intf); 445 446 Register vtable_index = R19_method; 447 __ ld(vtable_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset()), member_reg); 448 if (VerifyMethodHandles) { 449 Label L_index_ok; 450 __ cmpdi(CCR1, vtable_index, 0); 451 __ bge(CCR1, L_index_ok); 452 __ stop("invalid vtable index for MH.invokeInterface"); 453 __ BIND(L_index_ok); 454 } 455 456 // given intf, index, and recv klass, dispatch to the implementation method 457 __ lookup_interface_method(temp1_recv_klass, temp2_intf, 458 // note: next two args must be the same: 459 vtable_index, R19_method, 460 temp3, temp4, 461 L_incompatible_class_change_error); 462 break; 463 } 464 465 default: 466 fatal("unexpected intrinsic %d: %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid)); 467 break; 468 } 469 470 // Live at this point: 471 // R19_method 472 473 // After figuring out which concrete method to call, jump into it. 474 // Note that this works in the interpreter with no data motion. 475 // But the compiled version will require that rcx_recv be shifted out. 476 __ verify_method_ptr(R19_method); 477 jump_from_method_handle(_masm, R19_method, temp1, temp2, for_compiler_entry); 478 479 if (iid == vmIntrinsics::_linkToInterface) { 480 __ BIND(L_incompatible_class_change_error); 481 __ load_const_optimized(temp1, StubRoutines::throw_IncompatibleClassChangeError_entry()); 482 __ mtctr(temp1); 483 __ bctr(); 484 } 485 } 486 } 487 488 #ifndef PRODUCT 489 void trace_method_handle_stub(const char* adaptername, 490 oopDesc* mh, 491 intptr_t* entry_sp, 492 intptr_t* saved_regs) { 493 494 bool has_mh = (strstr(adaptername, "/static") == NULL && 495 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH 496 const char* mh_reg_name = has_mh ? "R23_method_handle" : "G23"; 497 log_info(methodhandles)("MH %s %s=" INTPTR_FORMAT " sp=" INTPTR_FORMAT, 498 adaptername, mh_reg_name, p2i(mh), p2i(entry_sp)); 499 500 LogTarget(Trace, methodhandles) lt; 501 if (lt.is_enabled()) { 502 ResourceMark rm; 503 LogStream ls(lt); 504 ls.print_cr("Registers:"); 505 const int abi_offset = frame::abi_reg_args_size / 8; 506 for (int i = R3->encoding(); i <= R12->encoding(); i++) { 507 Register r = as_Register(i); 508 int count = i - R3->encoding(); 509 // The registers are stored in reverse order on the stack (by save_volatile_gprs(R1_SP, abi_reg_args_size)). 510 ls.print("%3s=" PTR_FORMAT, r->name(), saved_regs[abi_offset + count]); 511 if ((count + 1) % 4 == 0) { 512 ls.cr(); 513 } else { 514 ls.print(", "); 515 } 516 } 517 ls.cr(); 518 519 { 520 // dumping last frame with frame::describe 521 522 JavaThread* p = JavaThread::active(); 523 524 // may not be needed by safer and unexpensive here 525 PreserveExceptionMark pem(Thread::current()); 526 FrameValues values; 527 528 // Note: We want to allow trace_method_handle from any call site. 529 // While trace_method_handle creates a frame, it may be entered 530 // without a PC on the stack top (e.g. not just after a call). 531 // Walking that frame could lead to failures due to that invalid PC. 532 // => carefully detect that frame when doing the stack walking 533 534 // Current C frame 535 frame cur_frame = os::current_frame(); 536 537 // Robust search of trace_calling_frame (independent of inlining). 538 assert(cur_frame.sp() <= saved_regs, "registers not saved on stack ?"); 539 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame); 540 while (trace_calling_frame.fp() < saved_regs) { 541 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame); 542 } 543 544 // Safely create a frame and call frame::describe. 545 intptr_t *dump_sp = trace_calling_frame.sender_sp(); 546 547 frame dump_frame = frame(dump_sp); 548 dump_frame.describe(values, 1); 549 550 values.describe(-1, saved_regs, "raw top of stack"); 551 552 ls.print_cr("Stack layout:"); 553 values.print_on(p, &ls); 554 } 555 556 if (has_mh && oopDesc::is_oop(mh)) { 557 mh->print_on(&ls); 558 if (java_lang_invoke_MethodHandle::is_instance(mh)) { 559 java_lang_invoke_MethodHandle::form(mh)->print_on(&ls); 560 } 561 } 562 } 563 } 564 565 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { 566 if (!log_is_enabled(Info, methodhandles)) return; 567 568 BLOCK_COMMENT("trace_method_handle {"); 569 570 const Register tmp = R11; // Will be preserved. 571 const int nbytes_save = MacroAssembler::num_volatile_regs * 8; 572 __ save_volatile_gprs(R1_SP, -nbytes_save); // except R0 573 __ save_LR_CR(tmp); // save in old frame 574 575 __ mr(R5_ARG3, R1_SP); // saved_sp 576 __ push_frame_reg_args(nbytes_save, tmp); 577 578 __ load_const_optimized(R3_ARG1, (address)adaptername, tmp); 579 __ mr(R4_ARG2, R23_method_handle); 580 __ mr(R6_ARG4, R1_SP); 581 __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub)); 582 583 __ pop_frame(); 584 __ restore_LR_CR(tmp); 585 __ restore_volatile_gprs(R1_SP, -nbytes_save); // except R0 586 587 BLOCK_COMMENT("} trace_method_handle"); 588 } 589 #endif // PRODUCT