1 /* 2 * Copyright (c) 1998, 2025, 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 #ifndef SHARE_CODE_CODEBLOB_HPP 26 #define SHARE_CODE_CODEBLOB_HPP 27 28 #include "asm/codeBuffer.hpp" 29 #include "compiler/compilerDefinitions.hpp" 30 #include "compiler/oopMap.hpp" 31 #include "runtime/javaFrameAnchor.hpp" 32 #include "runtime/frame.hpp" 33 #include "runtime/handles.hpp" 34 #include "utilities/align.hpp" 35 #include "utilities/macros.hpp" 36 37 class ImmutableOopMap; 38 class ImmutableOopMapSet; 39 class JNIHandleBlock; 40 class OopMapSet; 41 42 // CodeBlob Types 43 // Used in the CodeCache to assign CodeBlobs to different CodeHeaps 44 enum class CodeBlobType { 45 MethodNonProfiled = 0, // Execution level 1 and 4 (non-profiled) nmethods (including native nmethods) 46 MethodProfiled = 1, // Execution level 2 and 3 (profiled) nmethods 47 NonNMethod = 2, // Non-nmethods like Buffers, Adapters and Runtime Stubs 48 All = 3, // All types (No code cache segmentation) 49 NumTypes = 4 // Number of CodeBlobTypes 50 }; 51 52 // CodeBlob - superclass for all entries in the CodeCache. 53 // 54 // Subtypes are: 55 // nmethod : JIT Compiled Java methods 56 // RuntimeBlob : Non-compiled method code; generated glue code 57 // BufferBlob : Used for non-relocatable code such as interpreter, stubroutines, etc. 58 // AdapterBlob : Used to hold C2I/I2C adapters 59 // VtableBlob : Used for holding vtable chunks 60 // MethodHandlesAdapterBlob : Used to hold MethodHandles adapters 61 // BufferedInlineTypeBlob : used for pack/unpack handlers 62 // RuntimeStub : Call to VM runtime methods 63 // SingletonBlob : Super-class for all blobs that exist in only one instance 64 // DeoptimizationBlob : Used for deoptimization 65 // SafepointBlob : Used to handle illegal instruction exceptions 66 // ExceptionBlob : Used for stack unrolling 67 // UncommonTrapBlob : Used to handle uncommon traps 68 // UpcallStub : Used for upcalls from native code 69 // 70 // 71 // Layout in the CodeCache: 72 // - header 73 // - content space 74 // - instruction space 75 // Outside of the CodeCache: 76 // - mutable_data 77 // - relocation info 78 // - additional data for subclasses 79 80 enum class CodeBlobKind : u1 { 81 None, 82 Nmethod, 83 Buffer, 84 Adapter, 85 Vtable, 86 MHAdapter, 87 BufferedInlineType, 88 RuntimeStub, 89 Deoptimization, 90 Safepoint, 91 #ifdef COMPILER2 92 Exception, 93 UncommonTrap, 94 #endif 95 Upcall, 96 Number_Of_Kinds 97 }; 98 99 class UpcallStub; // for as_upcall_stub() 100 class RuntimeStub; // for as_runtime_stub() 101 class JavaFrameAnchor; // for UpcallStub::jfa_for_frame 102 class AdapterBlob; 103 class ExceptionBlob; 104 class DeoptimizationBlob; 105 class SafepointBlob; 106 class UncommonTrapBlob; 107 108 class CodeBlob { 109 friend class VMStructs; 110 friend class JVMCIVMStructs; 111 112 private: 113 void restore_mutable_data(address reloc_data); 114 115 protected: 116 // order fields from large to small to minimize padding between fields 117 ImmutableOopMapSet* _oop_maps; // OopMap for this CodeBlob 118 const char* _name; 119 address _mutable_data; 120 121 int _size; // total size of CodeBlob in bytes 122 int _relocation_size; // size of relocation (could be bigger than 64Kb) 123 int _content_offset; // offset to where content region begins (this includes consts, insts, stubs) 124 int _code_offset; // offset to where instructions region begins (this includes insts, stubs) 125 int _data_offset; // offset to where data region begins 126 int _frame_size; // size of stack frame in words (NOT slots. On x64 these are 64bit words) 127 int _mutable_data_size; 128 129 S390_ONLY(int _ctable_offset;) 130 131 uint16_t _header_size; // size of header (depends on subclass) 132 int16_t _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have 133 // not finished setting up their frame. Beware of pc's in 134 // that range. There is a similar range(s) on returns 135 // which we don't detect. 136 137 CodeBlobKind _kind; // Kind of this code blob 138 139 bool _caller_must_gc_arguments; 140 141 #ifndef PRODUCT 142 AsmRemarks _asm_remarks; 143 DbgStrings _dbg_strings; 144 #endif 145 146 void print_on_impl(outputStream* st) const; 147 void print_value_on_impl(outputStream* st) const; 148 149 class Vptr { 150 public: 151 virtual void print_on(const CodeBlob* instance, outputStream* st) const = 0; 152 virtual void print_value_on(const CodeBlob* instance, outputStream* st) const = 0; 153 virtual void prepare_for_archiving(CodeBlob* instance) const { 154 instance->prepare_for_archiving_impl(); 155 }; 156 virtual void post_restore(CodeBlob* instance) const { 157 instance->post_restore_impl(); 158 }; 159 }; 160 161 static const Vptr* vptr(CodeBlobKind kind); 162 const Vptr* vptr() const; 163 164 CodeBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, uint16_t header_size, 165 int16_t frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments, 166 int mutable_data_size); 167 168 // Simple CodeBlob used for simple BufferBlob. 169 CodeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size); 170 171 172 void operator delete(void* p) { } 173 174 void prepare_for_archiving_impl(); 175 void post_restore_impl(); 176 177 public: 178 179 ~CodeBlob() { 180 assert(_oop_maps == nullptr, "Not flushed"); 181 } 182 183 // Returns the space needed for CodeBlob 184 static unsigned int allocation_size(CodeBuffer* cb, int header_size); 185 static unsigned int align_code_offset(int offset); 186 187 // Deletion 188 void purge(); 189 190 // Typing 191 bool is_nmethod() const { return _kind == CodeBlobKind::Nmethod; } 192 bool is_buffer_blob() const { return _kind == CodeBlobKind::Buffer; } 193 bool is_runtime_stub() const { return _kind == CodeBlobKind::RuntimeStub; } 194 bool is_deoptimization_stub() const { return _kind == CodeBlobKind::Deoptimization; } 195 #ifdef COMPILER2 196 bool is_uncommon_trap_stub() const { return _kind == CodeBlobKind::UncommonTrap; } 197 bool is_exception_stub() const { return _kind == CodeBlobKind::Exception; } 198 #else 199 bool is_uncommon_trap_stub() const { return false; } 200 bool is_exception_stub() const { return false; } 201 #endif 202 bool is_safepoint_stub() const { return _kind == CodeBlobKind::Safepoint; } 203 bool is_adapter_blob() const { return _kind == CodeBlobKind::Adapter; } 204 bool is_vtable_blob() const { return _kind == CodeBlobKind::Vtable; } 205 bool is_method_handles_adapter_blob() const { return _kind == CodeBlobKind::MHAdapter; } 206 bool is_buffered_inline_type_blob() const { return _kind == CodeBlobKind::BufferedInlineType; } 207 bool is_upcall_stub() const { return _kind == CodeBlobKind::Upcall; } 208 209 // Casting 210 nmethod* as_nmethod_or_null() const { return is_nmethod() ? (nmethod*) this : nullptr; } 211 nmethod* as_nmethod() const { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; } 212 CodeBlob* as_codeblob() const { return (CodeBlob*) this; } 213 AdapterBlob* as_adapter_blob() const { assert(is_adapter_blob(), "must be adapter blob"); return (AdapterBlob*) this; } 214 ExceptionBlob* as_exception_blob() const { assert(is_exception_stub(), "must be exception stub"); return (ExceptionBlob*) this; } 215 DeoptimizationBlob* as_deoptimization_blob() const { assert(is_deoptimization_stub(), "must be deopt stub"); return (DeoptimizationBlob*) this; } 216 SafepointBlob* as_safepoint_blob() const { assert(is_safepoint_stub(), "must be safepoint stub"); return (SafepointBlob*) this; } 217 UpcallStub* as_upcall_stub() const { assert(is_upcall_stub(), "must be upcall stub"); return (UpcallStub*) this; } 218 RuntimeStub* as_runtime_stub() const { assert(is_runtime_stub(), "must be runtime blob"); return (RuntimeStub*) this; } 219 UncommonTrapBlob* as_uncommon_trap_blob() const { assert(is_uncommon_trap_stub(), "must be uncommon trap stub"); return (UncommonTrapBlob*) this; } 220 221 // Boundaries 222 address header_begin() const { return (address) this; } 223 address header_end() const { return ((address) this) + _header_size; } 224 address content_begin() const { return (address) header_begin() + _content_offset; } 225 address content_end() const { return (address) header_begin() + _data_offset; } 226 address code_begin() const { return (address) header_begin() + _code_offset; } 227 address code_end() const { return (address) header_begin() + _data_offset; } 228 address data_begin() const { return (address) header_begin() + _data_offset; } 229 address data_end() const { return (address) header_begin() + _size; } 230 address blob_end() const { return (address) header_begin() + _size; } 231 // code_end == content_end is true for all types of blobs for now, it is also checked in the constructor 232 233 int mutable_data_size() const { return _mutable_data_size; } 234 address mutable_data_begin() const { return _mutable_data; } 235 address mutable_data_end() const { return _mutable_data + _mutable_data_size; } 236 237 relocInfo* relocation_begin() const { return (relocInfo*)_mutable_data; } 238 relocInfo* relocation_end() const { return (relocInfo*)((address)relocation_begin() + _relocation_size); } 239 240 // Offsets 241 int content_offset() const { return _content_offset; } 242 int code_offset() const { return _code_offset; } 243 244 // This field holds the beginning of the const section in the old code buffer. 245 // It is needed to fix relocations of pc-relative loads when resizing the 246 // the constant pool or moving it. 247 S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; }) 248 void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) } 249 250 // Sizes 251 int size() const { return _size; } 252 int header_size() const { return _header_size; } 253 int relocation_size() const { return pointer_delta_as_int((address) relocation_end(), (address) relocation_begin()); } 254 int content_size() const { return pointer_delta_as_int(content_end(), content_begin()); } 255 int code_size() const { return pointer_delta_as_int(code_end(), code_begin()); } 256 257 // Only used from CodeCache::free_unused_tail() after the Interpreter blob was trimmed 258 void adjust_size(size_t used) { 259 _size = (int)used; 260 _data_offset = _size; 261 } 262 263 // Containment 264 bool blob_contains(address addr) const { return header_begin() <= addr && addr < blob_end(); } 265 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); } 266 bool contains(address addr) const { return content_begin() <= addr && addr < content_end(); } 267 bool is_frame_complete_at(address addr) const { return _frame_complete_offset != CodeOffsets::frame_never_safe && 268 code_contains(addr) && addr >= code_begin() + _frame_complete_offset; } 269 int frame_complete_offset() const { return _frame_complete_offset; } 270 271 // OopMap for frame 272 ImmutableOopMapSet* oop_maps() const { return _oop_maps; } 273 void set_oop_maps(OopMapSet* p); 274 void set_oop_maps(ImmutableOopMapSet* p) { _oop_maps = p; } 275 276 const ImmutableOopMap* oop_map_for_slot(int slot, address return_address) const; 277 const ImmutableOopMap* oop_map_for_return_address(address return_address) const; 278 279 // Frame support. Sizes are in word units. 280 int frame_size() const { return _frame_size; } 281 void set_frame_size(int size) { _frame_size = size; } 282 283 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments 284 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; } 285 286 // Naming 287 const char* name() const { return _name; } 288 void set_name(const char* name) { _name = name; } 289 290 // Debugging 291 void verify(); 292 void print() const; 293 void print_on(outputStream* st) const; 294 void print_value_on(outputStream* st) const; 295 296 void dump_for_addr(address addr, outputStream* st, bool verbose) const; 297 void print_code_on(outputStream* st); 298 299 // Print to stream, any comments associated with offset. 300 void print_block_comment(outputStream* stream, address block_begin) const; 301 302 #ifndef PRODUCT 303 AsmRemarks &asm_remarks() { return _asm_remarks; } 304 DbgStrings &dbg_strings() { return _dbg_strings; } 305 306 void use_remarks(AsmRemarks &remarks) { _asm_remarks.share(remarks); } 307 void use_strings(DbgStrings &strings) { _dbg_strings.share(strings); } 308 #endif 309 310 void copy_to(address buffer) { 311 memcpy(buffer, this, this->size()); 312 } 313 314 // methods to archive a blob into AOT code cache 315 void prepare_for_archiving(); 316 static void archive_blob(CodeBlob* blob, address archive_buffer); 317 318 // methods to restore a blob from AOT code cache into the CodeCache 319 void post_restore(); 320 CodeBlob* restore(address code_cache_buffer, const char* name, address archived_reloc_data, ImmutableOopMapSet* archived_oop_maps); 321 static CodeBlob* create(CodeBlob* archived_blob, 322 const char* name, 323 address archived_reloc_data, 324 ImmutableOopMapSet* archived_oop_maps); 325 }; 326 327 //---------------------------------------------------------------------------------------------------- 328 // RuntimeBlob: used for non-compiled method code (adapters, stubs, blobs) 329 330 class RuntimeBlob : public CodeBlob { 331 friend class VMStructs; 332 public: 333 334 // Creation 335 // a) simple CodeBlob 336 RuntimeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size) 337 : CodeBlob(name, kind, size, header_size) 338 {} 339 340 // b) full CodeBlob 341 // frame_complete is the offset from the beginning of the instructions 342 // to where the frame setup (from stackwalk viewpoint) is complete. 343 RuntimeBlob( 344 const char* name, 345 CodeBlobKind kind, 346 CodeBuffer* cb, 347 int size, 348 uint16_t header_size, 349 int16_t frame_complete, 350 int frame_size, 351 OopMapSet* oop_maps, 352 bool caller_must_gc_arguments = false 353 ); 354 355 static void free(RuntimeBlob* blob); 356 357 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService. 358 static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = ""); 359 360 class Vptr : public CodeBlob::Vptr { 361 }; 362 }; 363 364 class WhiteBox; 365 //---------------------------------------------------------------------------------------------------- 366 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc. 367 368 class BufferBlob: public RuntimeBlob { 369 friend class VMStructs; 370 friend class AdapterBlob; 371 friend class VtableBlob; 372 friend class MethodHandlesAdapterBlob; 373 friend class BufferedInlineTypeBlob; 374 friend class UpcallStub; 375 friend class WhiteBox; 376 377 private: 378 // Creation support 379 BufferBlob(const char* name, CodeBlobKind kind, int size); 380 BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, int header_size); 381 BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, int frame_complete, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments = false); 382 383 void* operator new(size_t s, unsigned size) throw(); 384 385 public: 386 // Creation 387 static BufferBlob* create(const char* name, uint buffer_size); 388 static BufferBlob* create(const char* name, CodeBuffer* cb); 389 390 static void free(BufferBlob* buf); 391 392 void print_on_impl(outputStream* st) const; 393 void print_value_on_impl(outputStream* st) const; 394 395 class Vptr : public RuntimeBlob::Vptr { 396 void print_on(const CodeBlob* instance, outputStream* st) const override { 397 ((const BufferBlob*)instance)->print_on_impl(st); 398 } 399 void print_value_on(const CodeBlob* instance, outputStream* st) const override { 400 ((const BufferBlob*)instance)->print_value_on_impl(st); 401 } 402 }; 403 404 static const Vptr _vpntr; 405 }; 406 407 408 //---------------------------------------------------------------------------------------------------- 409 // AdapterBlob: used to hold C2I/I2C adapters 410 411 class AdapterBlob: public BufferBlob { 412 private: 413 AdapterBlob(int size, CodeBuffer* cb, int frame_complete, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments = false); 414 415 public: 416 // Creation 417 static AdapterBlob* create(CodeBuffer* cb, 418 int frame_complete, 419 int frame_size, 420 OopMapSet* oop_maps, 421 bool caller_must_gc_arguments = false); 422 423 bool caller_must_gc_arguments(JavaThread* thread) const { return true; } 424 }; 425 426 //--------------------------------------------------------------------------------------------------- 427 class VtableBlob: public BufferBlob { 428 private: 429 VtableBlob(const char*, int); 430 431 void* operator new(size_t s, unsigned size) throw(); 432 433 public: 434 // Creation 435 static VtableBlob* create(const char* name, int buffer_size); 436 }; 437 438 //---------------------------------------------------------------------------------------------------- 439 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters 440 441 class MethodHandlesAdapterBlob: public BufferBlob { 442 private: 443 MethodHandlesAdapterBlob(int size): BufferBlob("MethodHandles adapters", CodeBlobKind::MHAdapter, size) {} 444 445 public: 446 // Creation 447 static MethodHandlesAdapterBlob* create(int buffer_size); 448 }; 449 450 //---------------------------------------------------------------------------------------------------- 451 // BufferedInlineTypeBlob : used for pack/unpack handlers 452 453 class BufferedInlineTypeBlob: public BufferBlob { 454 private: 455 const int _pack_fields_off; 456 const int _pack_fields_jobject_off; 457 const int _unpack_fields_off; 458 459 BufferedInlineTypeBlob(int size, CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off); 460 461 public: 462 // Creation 463 static BufferedInlineTypeBlob* create(CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off); 464 465 address pack_fields() const { return code_begin() + _pack_fields_off; } 466 address pack_fields_jobject() const { return code_begin() + _pack_fields_jobject_off; } 467 address unpack_fields() const { return code_begin() + _unpack_fields_off; } 468 }; 469 470 //---------------------------------------------------------------------------------------------------- 471 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine 472 473 class RuntimeStub: public RuntimeBlob { 474 friend class VMStructs; 475 private: 476 // Creation support 477 RuntimeStub( 478 const char* name, 479 CodeBuffer* cb, 480 int size, 481 int16_t frame_complete, 482 int frame_size, 483 OopMapSet* oop_maps, 484 bool caller_must_gc_arguments 485 ); 486 487 void* operator new(size_t s, unsigned size) throw(); 488 489 public: 490 // Creation 491 static RuntimeStub* new_runtime_stub( 492 const char* stub_name, 493 CodeBuffer* cb, 494 int16_t frame_complete, 495 int frame_size, 496 OopMapSet* oop_maps, 497 bool caller_must_gc_arguments, 498 bool alloc_fail_is_fatal=true 499 ); 500 501 static void free(RuntimeStub* stub) { RuntimeBlob::free(stub); } 502 503 address entry_point() const { return code_begin(); } 504 505 void print_on_impl(outputStream* st) const; 506 void print_value_on_impl(outputStream* st) const; 507 508 class Vptr : public RuntimeBlob::Vptr { 509 void print_on(const CodeBlob* instance, outputStream* st) const override { 510 instance->as_runtime_stub()->print_on_impl(st); 511 } 512 void print_value_on(const CodeBlob* instance, outputStream* st) const override { 513 instance->as_runtime_stub()->print_value_on_impl(st); 514 } 515 }; 516 517 static const Vptr _vpntr; 518 }; 519 520 521 //---------------------------------------------------------------------------------------------------- 522 // Super-class for all blobs that exist in only one instance. Implements default behaviour. 523 524 class SingletonBlob: public RuntimeBlob { 525 friend class VMStructs; 526 527 protected: 528 void* operator new(size_t s, unsigned size, bool alloc_fail_is_fatal=true) throw(); 529 530 public: 531 SingletonBlob( 532 const char* name, 533 CodeBlobKind kind, 534 CodeBuffer* cb, 535 int size, 536 uint16_t header_size, 537 int frame_size, 538 OopMapSet* oop_maps 539 ) 540 : RuntimeBlob(name, kind, cb, size, header_size, CodeOffsets::frame_never_safe, frame_size, oop_maps) 541 {}; 542 543 address entry_point() { return code_begin(); } 544 545 void print_on_impl(outputStream* st) const; 546 void print_value_on_impl(outputStream* st) const; 547 548 class Vptr : public RuntimeBlob::Vptr { 549 void print_on(const CodeBlob* instance, outputStream* st) const override { 550 ((const SingletonBlob*)instance)->print_on_impl(st); 551 } 552 void print_value_on(const CodeBlob* instance, outputStream* st) const override { 553 ((const SingletonBlob*)instance)->print_value_on_impl(st); 554 } 555 }; 556 557 static const Vptr _vpntr; 558 }; 559 560 561 //---------------------------------------------------------------------------------------------------- 562 // DeoptimizationBlob 563 564 class DeoptimizationBlob: public SingletonBlob { 565 friend class VMStructs; 566 friend class JVMCIVMStructs; 567 private: 568 int _unpack_offset; 569 int _unpack_with_exception; 570 int _unpack_with_reexecution; 571 572 int _unpack_with_exception_in_tls; 573 574 #if INCLUDE_JVMCI 575 // Offsets when JVMCI calls uncommon_trap. 576 int _uncommon_trap_offset; 577 int _implicit_exception_uncommon_trap_offset; 578 #endif 579 580 // Creation support 581 DeoptimizationBlob( 582 CodeBuffer* cb, 583 int size, 584 OopMapSet* oop_maps, 585 int unpack_offset, 586 int unpack_with_exception_offset, 587 int unpack_with_reexecution_offset, 588 int frame_size 589 ); 590 591 public: 592 // Creation 593 static DeoptimizationBlob* create( 594 CodeBuffer* cb, 595 OopMapSet* oop_maps, 596 int unpack_offset, 597 int unpack_with_exception_offset, 598 int unpack_with_reexecution_offset, 599 int frame_size 600 ); 601 602 address unpack() const { return code_begin() + _unpack_offset; } 603 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; } 604 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; } 605 606 // Alternate entry point for C1 where the exception and issuing pc 607 // are in JavaThread::_exception_oop and JavaThread::_exception_pc 608 // instead of being in registers. This is needed because C1 doesn't 609 // model exception paths in a way that keeps these registers free so 610 // there may be live values in those registers during deopt. 611 void set_unpack_with_exception_in_tls_offset(int offset) { 612 _unpack_with_exception_in_tls = offset; 613 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob"); 614 } 615 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; } 616 617 #if INCLUDE_JVMCI 618 // Offsets when JVMCI calls uncommon_trap. 619 void set_uncommon_trap_offset(int offset) { 620 _uncommon_trap_offset = offset; 621 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob"); 622 } 623 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; } 624 625 void set_implicit_exception_uncommon_trap_offset(int offset) { 626 _implicit_exception_uncommon_trap_offset = offset; 627 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob"); 628 } 629 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; } 630 #endif // INCLUDE_JVMCI 631 632 void print_value_on_impl(outputStream* st) const; 633 634 class Vptr : public SingletonBlob::Vptr { 635 void print_value_on(const CodeBlob* instance, outputStream* st) const override { 636 ((const DeoptimizationBlob*)instance)->print_value_on_impl(st); 637 } 638 }; 639 640 static const Vptr _vpntr; 641 }; 642 643 644 //---------------------------------------------------------------------------------------------------- 645 // UncommonTrapBlob (currently only used by Compiler 2) 646 647 #ifdef COMPILER2 648 649 class UncommonTrapBlob: public SingletonBlob { 650 friend class VMStructs; 651 private: 652 // Creation support 653 UncommonTrapBlob( 654 CodeBuffer* cb, 655 int size, 656 OopMapSet* oop_maps, 657 int frame_size 658 ); 659 660 public: 661 // Creation 662 static UncommonTrapBlob* create( 663 CodeBuffer* cb, 664 OopMapSet* oop_maps, 665 int frame_size 666 ); 667 }; 668 669 670 //---------------------------------------------------------------------------------------------------- 671 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2) 672 673 class ExceptionBlob: public SingletonBlob { 674 friend class VMStructs; 675 private: 676 // Creation support 677 ExceptionBlob( 678 CodeBuffer* cb, 679 int size, 680 OopMapSet* oop_maps, 681 int frame_size 682 ); 683 684 public: 685 // Creation 686 static ExceptionBlob* create( 687 CodeBuffer* cb, 688 OopMapSet* oop_maps, 689 int frame_size 690 ); 691 692 void post_restore_impl() { 693 trace_new_stub(this, "ExceptionBlob"); 694 } 695 696 class Vptr : public SingletonBlob::Vptr { 697 void post_restore(CodeBlob* instance) const override { 698 ((ExceptionBlob*)instance)->post_restore_impl(); 699 } 700 }; 701 702 static const Vptr _vpntr; 703 }; 704 #endif // COMPILER2 705 706 707 //---------------------------------------------------------------------------------------------------- 708 // SafepointBlob: handles illegal_instruction exceptions during a safepoint 709 710 class SafepointBlob: public SingletonBlob { 711 friend class VMStructs; 712 private: 713 // Creation support 714 SafepointBlob( 715 CodeBuffer* cb, 716 int size, 717 OopMapSet* oop_maps, 718 int frame_size 719 ); 720 721 public: 722 // Creation 723 static SafepointBlob* create( 724 CodeBuffer* cb, 725 OopMapSet* oop_maps, 726 int frame_size 727 ); 728 }; 729 730 //---------------------------------------------------------------------------------------------------- 731 732 class UpcallLinker; 733 734 // A (Panama) upcall stub. Not used by JNI. 735 class UpcallStub: public RuntimeBlob { 736 friend class VMStructs; 737 friend class UpcallLinker; 738 private: 739 jobject _receiver; 740 ByteSize _frame_data_offset; 741 742 UpcallStub(const char* name, CodeBuffer* cb, int size, jobject receiver, ByteSize frame_data_offset); 743 744 void* operator new(size_t s, unsigned size) throw(); 745 746 struct FrameData { 747 JavaFrameAnchor jfa; 748 JavaThread* thread; 749 JNIHandleBlock* old_handles; 750 JNIHandleBlock* new_handles; 751 }; 752 753 // defined in frame_ARCH.cpp 754 FrameData* frame_data_for_frame(const frame& frame) const; 755 public: 756 // Creation 757 static UpcallStub* create(const char* name, CodeBuffer* cb, jobject receiver, ByteSize frame_data_offset); 758 759 static void free(UpcallStub* blob); 760 761 jobject receiver() { return _receiver; } 762 763 JavaFrameAnchor* jfa_for_frame(const frame& frame) const; 764 765 // GC support 766 void oops_do(OopClosure* f, const frame& frame); 767 768 void print_on_impl(outputStream* st) const; 769 void print_value_on_impl(outputStream* st) const; 770 771 class Vptr : public RuntimeBlob::Vptr { 772 void print_on(const CodeBlob* instance, outputStream* st) const override { 773 instance->as_upcall_stub()->print_on_impl(st); 774 } 775 void print_value_on(const CodeBlob* instance, outputStream* st) const override { 776 instance->as_upcall_stub()->print_value_on_impl(st); 777 } 778 }; 779 780 static const Vptr _vpntr; 781 }; 782 783 #endif // SHARE_CODE_CODEBLOB_HPP