1 /* 2 * Copyright (c) 1997, 2019, 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_ASM_CODEBUFFER_HPP 26 #define SHARE_ASM_CODEBUFFER_HPP 27 28 #include "code/oopRecorder.hpp" 29 #include "code/relocInfo.hpp" 30 #include "utilities/align.hpp" 31 #include "utilities/debug.hpp" 32 #include "utilities/macros.hpp" 33 34 class CodeStrings; 35 class PhaseCFG; 36 class Compile; 37 class BufferBlob; 38 class CodeBuffer; 39 class Label; 40 41 class CodeOffsets: public StackObj { 42 public: 43 enum Entries { Entry, 44 Verified_Entry, 45 Frame_Complete, // Offset in the code where the frame setup is (for forte stackwalks) is complete 46 OSR_Entry, 47 Exceptions, // Offset where exception handler lives 48 Deopt, // Offset where deopt handler lives 49 DeoptMH, // Offset where MethodHandle deopt handler lives 50 UnwindHandler, // Offset to default unwind handler 51 max_Entries }; 52 53 // special value to note codeBlobs where profile (forte) stack walking is 54 // always dangerous and suspect. 55 56 enum { frame_never_safe = -1 }; 57 58 private: 59 int _values[max_Entries]; 60 61 public: 62 CodeOffsets() { 63 _values[Entry ] = 0; 64 _values[Verified_Entry] = 0; 65 _values[Frame_Complete] = frame_never_safe; 66 _values[OSR_Entry ] = 0; 67 _values[Exceptions ] = -1; 68 _values[Deopt ] = -1; 69 _values[DeoptMH ] = -1; 70 _values[UnwindHandler ] = -1; 71 } 72 73 int value(Entries e) { return _values[e]; } 74 void set_value(Entries e, int val) { _values[e] = val; } 75 }; 76 77 // This class represents a stream of code and associated relocations. 78 // There are a few in each CodeBuffer. 79 // They are filled concurrently, and concatenated at the end. 80 class CodeSection { 81 friend class CodeBuffer; 82 public: 83 typedef int csize_t; // code size type; would be size_t except for history 84 85 private: 86 address _start; // first byte of contents (instructions) 87 address _mark; // user mark, usually an instruction beginning 88 address _end; // current end address 89 address _limit; // last possible (allocated) end address 90 relocInfo* _locs_start; // first byte of relocation information 91 relocInfo* _locs_end; // first byte after relocation information 92 relocInfo* _locs_limit; // first byte after relocation information buf 93 address _locs_point; // last relocated position (grows upward) 94 bool _locs_own; // did I allocate the locs myself? 95 bool _frozen; // no more expansion of this section 96 bool _scratch_emit; // Buffer is used for scratch emit, don't relocate. 97 char _index; // my section number (SECT_INST, etc.) 98 CodeBuffer* _outer; // enclosing CodeBuffer 99 100 // (Note: _locs_point used to be called _last_reloc_offset.) 101 102 CodeSection() { 103 _start = NULL; 104 _mark = NULL; 105 _end = NULL; 106 _limit = NULL; 107 _locs_start = NULL; 108 _locs_end = NULL; 109 _locs_limit = NULL; 110 _locs_point = NULL; 111 _locs_own = false; 112 _frozen = false; 113 _scratch_emit = false; 114 debug_only(_index = (char)-1); 115 debug_only(_outer = (CodeBuffer*)badAddress); 116 } 117 118 void initialize_outer(CodeBuffer* outer, int index) { 119 _outer = outer; 120 _index = index; 121 } 122 123 void initialize(address start, csize_t size = 0) { 124 assert(_start == NULL, "only one init step, please"); 125 _start = start; 126 _mark = NULL; 127 _end = start; 128 129 _limit = start + size; 130 _locs_point = start; 131 } 132 133 void initialize_locs(int locs_capacity); 134 void expand_locs(int new_capacity); 135 void initialize_locs_from(const CodeSection* source_cs); 136 137 // helper for CodeBuffer::expand() 138 void take_over_code_from(CodeSection* cs) { 139 _start = cs->_start; 140 _mark = cs->_mark; 141 _end = cs->_end; 142 _limit = cs->_limit; 143 _locs_point = cs->_locs_point; 144 } 145 146 public: 147 address start() const { return _start; } 148 address mark() const { return _mark; } 149 address end() const { return _end; } 150 address limit() const { return _limit; } 151 csize_t size() const { return (csize_t)(_end - _start); } 152 csize_t mark_off() const { assert(_mark != NULL, "not an offset"); 153 return (csize_t)(_mark - _start); } 154 csize_t capacity() const { return (csize_t)(_limit - _start); } 155 csize_t remaining() const { return (csize_t)(_limit - _end); } 156 157 relocInfo* locs_start() const { return _locs_start; } 158 relocInfo* locs_end() const { return _locs_end; } 159 int locs_count() const { return (int)(_locs_end - _locs_start); } 160 relocInfo* locs_limit() const { return _locs_limit; } 161 address locs_point() const { return _locs_point; } 162 csize_t locs_point_off() const{ return (csize_t)(_locs_point - _start); } 163 csize_t locs_capacity() const { return (csize_t)(_locs_limit - _locs_start); } 164 csize_t locs_remaining()const { return (csize_t)(_locs_limit - _locs_end); } 165 166 int index() const { return _index; } 167 bool is_allocated() const { return _start != NULL; } 168 bool is_empty() const { return _start == _end; } 169 bool is_frozen() const { return _frozen; } 170 bool has_locs() const { return _locs_end != NULL; } 171 172 // Mark scratch buffer. 173 void set_scratch_emit() { _scratch_emit = true; } 174 bool scratch_emit() { return _scratch_emit; } 175 176 CodeBuffer* outer() const { return _outer; } 177 178 // is a given address in this section? (2nd version is end-inclusive) 179 bool contains(address pc) const { return pc >= _start && pc < _end; } 180 bool contains2(address pc) const { return pc >= _start && pc <= _end; } 181 bool allocates(address pc) const { return pc >= _start && pc < _limit; } 182 bool allocates2(address pc) const { return pc >= _start && pc <= _limit; } 183 184 void set_end(address pc) { assert(allocates2(pc), "not in CodeBuffer memory: " INTPTR_FORMAT " <= " INTPTR_FORMAT " <= " INTPTR_FORMAT, p2i(_start), p2i(pc), p2i(_limit)); _end = pc; } 185 void set_mark(address pc) { assert(contains2(pc), "not in codeBuffer"); 186 _mark = pc; } 187 void set_mark_off(int offset) { assert(contains2(offset+_start),"not in codeBuffer"); 188 _mark = offset + _start; } 189 void set_mark() { _mark = _end; } 190 void clear_mark() { _mark = NULL; } 191 192 void set_locs_end(relocInfo* p) { 193 assert(p <= locs_limit(), "locs data fits in allocated buffer"); 194 _locs_end = p; 195 } 196 void set_locs_point(address pc) { 197 assert(pc >= locs_point(), "relocation addr may not decrease"); 198 assert(allocates2(pc), "relocation addr must be in this section"); 199 _locs_point = pc; 200 } 201 202 // Code emission 203 void emit_int8 ( int8_t x) { *((int8_t*) end()) = x; set_end(end() + sizeof(int8_t)); } 204 void emit_int16( int16_t x) { *((int16_t*) end()) = x; set_end(end() + sizeof(int16_t)); } 205 void emit_int32( int32_t x) { *((int32_t*) end()) = x; set_end(end() + sizeof(int32_t)); } 206 void emit_int64( int64_t x) { *((int64_t*) end()) = x; set_end(end() + sizeof(int64_t)); } 207 208 void emit_float( jfloat x) { *((jfloat*) end()) = x; set_end(end() + sizeof(jfloat)); } 209 void emit_double(jdouble x) { *((jdouble*) end()) = x; set_end(end() + sizeof(jdouble)); } 210 void emit_address(address x) { *((address*) end()) = x; set_end(end() + sizeof(address)); } 211 212 // Share a scratch buffer for relocinfo. (Hacky; saves a resource allocation.) 213 void initialize_shared_locs(relocInfo* buf, int length); 214 215 // Manage labels and their addresses. 216 address target(Label& L, address branch_pc); 217 218 // Emit a relocation. 219 void relocate(address at, RelocationHolder const& rspec, int format = 0); 220 void relocate(address at, relocInfo::relocType rtype, int format = 0, jint method_index = 0); 221 222 // alignment requirement for starting offset 223 // Requirements are that the instruction area and the 224 // stubs area must start on CodeEntryAlignment, and 225 // the ctable on sizeof(jdouble) 226 int alignment() const { return MAX2((int)sizeof(jdouble), (int)CodeEntryAlignment); } 227 228 // Slop between sections, used only when allocating temporary BufferBlob buffers. 229 static csize_t end_slop() { return MAX2((int)sizeof(jdouble), (int)CodeEntryAlignment); } 230 231 csize_t align_at_start(csize_t off) const { return (csize_t) align_up(off, alignment()); } 232 233 // Mark a section frozen. Assign its remaining space to 234 // the following section. It will never expand after this point. 235 inline void freeze(); // { _outer->freeze_section(this); } 236 237 // Ensure there's enough space left in the current section. 238 // Return true if there was an expansion. 239 bool maybe_expand_to_ensure_remaining(csize_t amount); 240 241 #ifndef PRODUCT 242 void decode(); 243 void print(const char* name); 244 #endif //PRODUCT 245 }; 246 247 class CodeString; 248 class CodeStrings { 249 private: 250 #ifndef PRODUCT 251 CodeString* _strings; 252 #ifdef ASSERT 253 // Becomes true after copy-out, forbids further use. 254 bool _defunct; // Zero bit pattern is "valid", see memset call in decode_env::decode_env 255 #endif 256 static const char* _prefix; // defaults to " ;; " 257 #endif 258 259 CodeString* find(intptr_t offset) const; 260 CodeString* find_last(intptr_t offset) const; 261 262 void set_null_and_invalidate() { 263 #ifndef PRODUCT 264 _strings = NULL; 265 #ifdef ASSERT 266 _defunct = true; 267 #endif 268 #endif 269 } 270 271 public: 272 CodeStrings() { 273 #ifndef PRODUCT 274 _strings = NULL; 275 #ifdef ASSERT 276 _defunct = false; 277 #endif 278 #endif 279 } 280 281 bool is_null() { 282 #ifdef ASSERT 283 return _strings == NULL; 284 #else 285 return true; 286 #endif 287 } 288 289 const char* add_string(const char * string) PRODUCT_RETURN_(return NULL;); 290 291 void add_comment(intptr_t offset, const char * comment) PRODUCT_RETURN; 292 bool has_block_comment(intptr_t offset) const; 293 void print_block_comment(outputStream* stream, intptr_t offset) const PRODUCT_RETURN; 294 // MOVE strings from other to this; invalidate other. 295 void assign(CodeStrings& other) PRODUCT_RETURN; 296 // COPY strings from other to this; leave other valid. 297 void copy(CodeStrings& other) PRODUCT_RETURN; 298 // FREE strings; invalidate this. 299 void free() PRODUCT_RETURN; 300 301 // Guarantee that _strings are used at most once; assign and free invalidate a buffer. 302 inline void check_valid() const { 303 #ifdef ASSERT 304 assert(!_defunct, "Use of invalid CodeStrings"); 305 #endif 306 } 307 308 static void set_prefix(const char *prefix) { 309 #ifndef PRODUCT 310 _prefix = prefix; 311 #endif 312 } 313 }; 314 315 // A CodeBuffer describes a memory space into which assembly 316 // code is generated. This memory space usually occupies the 317 // interior of a single BufferBlob, but in some cases it may be 318 // an arbitrary span of memory, even outside the code cache. 319 // 320 // A code buffer comes in two variants: 321 // 322 // (1) A CodeBuffer referring to an already allocated piece of memory: 323 // This is used to direct 'static' code generation (e.g. for interpreter 324 // or stubroutine generation, etc.). This code comes with NO relocation 325 // information. 326 // 327 // (2) A CodeBuffer referring to a piece of memory allocated when the 328 // CodeBuffer is allocated. This is used for nmethod generation. 329 // 330 // The memory can be divided up into several parts called sections. 331 // Each section independently accumulates code (or data) an relocations. 332 // Sections can grow (at the expense of a reallocation of the BufferBlob 333 // and recopying of all active sections). When the buffered code is finally 334 // written to an nmethod (or other CodeBlob), the contents (code, data, 335 // and relocations) of the sections are padded to an alignment and concatenated. 336 // Instructions and data in one section can contain relocatable references to 337 // addresses in a sibling section. 338 339 class CodeBuffer: public StackObj { 340 friend class CodeSection; 341 friend class StubCodeGenerator; 342 343 private: 344 // CodeBuffers must be allocated on the stack except for a single 345 // special case during expansion which is handled internally. This 346 // is done to guarantee proper cleanup of resources. 347 void* operator new(size_t size) throw() { return ResourceObj::operator new(size); } 348 void operator delete(void* p) { ShouldNotCallThis(); } 349 350 public: 351 typedef int csize_t; // code size type; would be size_t except for history 352 enum { 353 // Here is the list of all possible sections. The order reflects 354 // the final layout. 355 SECT_FIRST = 0, 356 SECT_CONSTS = SECT_FIRST, // Non-instruction data: Floats, jump tables, etc. 357 SECT_INSTS, // Executable instructions. 358 SECT_STUBS, // Outbound trampolines for supporting call sites. 359 SECT_LIMIT, SECT_NONE = -1 360 }; 361 362 private: 363 enum { 364 sect_bits = 2, // assert (SECT_LIMIT <= (1<<sect_bits)) 365 sect_mask = (1<<sect_bits)-1 366 }; 367 368 const char* _name; 369 370 CodeSection _consts; // constants, jump tables 371 CodeSection _insts; // instructions (the main section) 372 CodeSection _stubs; // stubs (call site support), deopt, exception handling 373 374 CodeBuffer* _before_expand; // dead buffer, from before the last expansion 375 376 BufferBlob* _blob; // optional buffer in CodeCache for generated code 377 address _total_start; // first address of combined memory buffer 378 csize_t _total_size; // size in bytes of combined memory buffer 379 380 OopRecorder* _oop_recorder; 381 CodeStrings _code_strings; 382 bool _collect_comments; // Indicate if we need to collect block comments at all. 383 OopRecorder _default_oop_recorder; // override with initialize_oop_recorder 384 Arena* _overflow_arena; 385 386 address _last_insn; // used to merge consecutive memory barriers, loads or stores. 387 388 #if INCLUDE_AOT 389 bool _immutable_PIC; 390 #endif 391 392 address _decode_begin; // start address for decode 393 address decode_begin(); 394 395 void initialize_misc(const char * name) { 396 // all pointers other than code_start/end and those inside the sections 397 assert(name != NULL, "must have a name"); 398 _name = name; 399 _before_expand = NULL; 400 _blob = NULL; 401 _oop_recorder = NULL; 402 _decode_begin = NULL; 403 _overflow_arena = NULL; 404 _code_strings = CodeStrings(); 405 _last_insn = NULL; 406 #if INCLUDE_AOT 407 _immutable_PIC = false; 408 #endif 409 410 // Collect block comments, but restrict collection to cases where a disassembly is output. 411 _collect_comments = ( PrintAssembly 412 || PrintStubCode 413 || PrintMethodHandleStubs 414 || PrintInterpreter 415 || PrintSignatureHandlers 416 ); 417 } 418 419 void initialize(address code_start, csize_t code_size) { 420 _consts.initialize_outer(this, SECT_CONSTS); 421 _insts.initialize_outer(this, SECT_INSTS); 422 _stubs.initialize_outer(this, SECT_STUBS); 423 _total_start = code_start; 424 _total_size = code_size; 425 // Initialize the main section: 426 _insts.initialize(code_start, code_size); 427 assert(!_stubs.is_allocated(), "no garbage here"); 428 assert(!_consts.is_allocated(), "no garbage here"); 429 _oop_recorder = &_default_oop_recorder; 430 } 431 432 void initialize_section_size(CodeSection* cs, csize_t size); 433 434 void freeze_section(CodeSection* cs); 435 436 // helper for CodeBuffer::expand() 437 void take_over_code_from(CodeBuffer* cs); 438 439 // ensure sections are disjoint, ordered, and contained in the blob 440 void verify_section_allocation(); 441 442 // copies combined relocations to the blob, returns bytes copied 443 // (if target is null, it is a dry run only, just for sizing) 444 csize_t copy_relocations_to(CodeBlob* blob) const; 445 446 // copies combined code to the blob (assumes relocs are already in there) 447 void copy_code_to(CodeBlob* blob); 448 449 // moves code sections to new buffer (assumes relocs are already in there) 450 void relocate_code_to(CodeBuffer* cb) const; 451 452 // set up a model of the final layout of my contents 453 void compute_final_layout(CodeBuffer* dest) const; 454 455 // Expand the given section so at least 'amount' is remaining. 456 // Creates a new, larger BufferBlob, and rewrites the code & relocs. 457 void expand(CodeSection* which_cs, csize_t amount); 458 459 // Helper for expand. 460 csize_t figure_expanded_capacities(CodeSection* which_cs, csize_t amount, csize_t* new_capacity); 461 462 public: 463 // (1) code buffer referring to pre-allocated instruction memory 464 CodeBuffer(address code_start, csize_t code_size) { 465 assert(code_start != NULL, "sanity"); 466 initialize_misc("static buffer"); 467 initialize(code_start, code_size); 468 verify_section_allocation(); 469 } 470 471 // (2) CodeBuffer referring to pre-allocated CodeBlob. 472 CodeBuffer(CodeBlob* blob); 473 474 // (3) code buffer allocating codeBlob memory for code & relocation 475 // info but with lazy initialization. The name must be something 476 // informative. 477 CodeBuffer(const char* name) { 478 initialize_misc(name); 479 } 480 481 // (4) code buffer allocating codeBlob memory for code & relocation 482 // info. The name must be something informative and code_size must 483 // include both code and stubs sizes. 484 CodeBuffer(const char* name, csize_t code_size, csize_t locs_size) { 485 initialize_misc(name); 486 initialize(code_size, locs_size); 487 } 488 489 ~CodeBuffer(); 490 491 // Initialize a CodeBuffer constructed using constructor 3. Using 492 // constructor 4 is equivalent to calling constructor 3 and then 493 // calling this method. It's been factored out for convenience of 494 // construction. 495 void initialize(csize_t code_size, csize_t locs_size); 496 497 CodeSection* consts() { return &_consts; } 498 CodeSection* insts() { return &_insts; } 499 CodeSection* stubs() { return &_stubs; } 500 501 const CodeSection* insts() const { return &_insts; } 502 503 // present sections in order; return NULL at end; consts is #0, etc. 504 CodeSection* code_section(int n) { 505 // This makes the slightly questionable but portable assumption 506 // that the various members (_consts, _insts, _stubs, etc.) are 507 // adjacent in the layout of CodeBuffer. 508 CodeSection* cs = &_consts + n; 509 assert(cs->index() == n || !cs->is_allocated(), "sanity"); 510 return cs; 511 } 512 const CodeSection* code_section(int n) const { // yucky const stuff 513 return ((CodeBuffer*)this)->code_section(n); 514 } 515 static const char* code_section_name(int n); 516 int section_index_of(address addr) const; 517 bool contains(address addr) const { 518 // handy for debugging 519 return section_index_of(addr) > SECT_NONE; 520 } 521 522 // A stable mapping between 'locators' (small ints) and addresses. 523 static int locator_pos(int locator) { return locator >> sect_bits; } 524 static int locator_sect(int locator) { return locator & sect_mask; } 525 static int locator(int pos, int sect) { return (pos << sect_bits) | sect; } 526 int locator(address addr) const; 527 address locator_address(int locator) const; 528 529 // Heuristic for pre-packing the taken/not-taken bit of a predicted branch. 530 bool is_backward_branch(Label& L); 531 532 // Properties 533 const char* name() const { return _name; } 534 void set_name(const char* name) { _name = name; } 535 CodeBuffer* before_expand() const { return _before_expand; } 536 BufferBlob* blob() const { return _blob; } 537 void set_blob(BufferBlob* blob); 538 void free_blob(); // Free the blob, if we own one. 539 540 // Properties relative to the insts section: 541 address insts_begin() const { return _insts.start(); } 542 address insts_end() const { return _insts.end(); } 543 void set_insts_end(address end) { _insts.set_end(end); } 544 address insts_limit() const { return _insts.limit(); } 545 address insts_mark() const { return _insts.mark(); } 546 void set_insts_mark() { _insts.set_mark(); } 547 void clear_insts_mark() { _insts.clear_mark(); } 548 549 // is there anything in the buffer other than the current section? 550 bool is_pure() const { return insts_size() == total_content_size(); } 551 552 // size in bytes of output so far in the insts sections 553 csize_t insts_size() const { return _insts.size(); } 554 555 // same as insts_size(), except that it asserts there is no non-code here 556 csize_t pure_insts_size() const { assert(is_pure(), "no non-code"); 557 return insts_size(); } 558 // capacity in bytes of the insts sections 559 csize_t insts_capacity() const { return _insts.capacity(); } 560 561 // number of bytes remaining in the insts section 562 csize_t insts_remaining() const { return _insts.remaining(); } 563 564 // is a given address in the insts section? (2nd version is end-inclusive) 565 bool insts_contains(address pc) const { return _insts.contains(pc); } 566 bool insts_contains2(address pc) const { return _insts.contains2(pc); } 567 568 // Record any extra oops required to keep embedded metadata alive 569 void finalize_oop_references(const methodHandle& method); 570 571 // Allocated size in all sections, when aligned and concatenated 572 // (this is the eventual state of the content in its final 573 // CodeBlob). 574 csize_t total_content_size() const; 575 576 // Combined offset (relative to start of first section) of given 577 // section, as eventually found in the final CodeBlob. 578 csize_t total_offset_of(const CodeSection* cs) const; 579 580 // allocated size of all relocation data, including index, rounded up 581 csize_t total_relocation_size() const; 582 583 csize_t copy_relocations_to(address buf, csize_t buf_limit, bool only_inst) const; 584 585 // allocated size of any and all recorded oops 586 csize_t total_oop_size() const { 587 OopRecorder* recorder = oop_recorder(); 588 return (recorder == NULL)? 0: recorder->oop_size(); 589 } 590 591 // allocated size of any and all recorded metadata 592 csize_t total_metadata_size() const { 593 OopRecorder* recorder = oop_recorder(); 594 return (recorder == NULL)? 0: recorder->metadata_size(); 595 } 596 597 // Configuration functions, called immediately after the CB is constructed. 598 // The section sizes are subtracted from the original insts section. 599 // Note: Call them in reverse section order, because each steals from insts. 600 void initialize_consts_size(csize_t size) { initialize_section_size(&_consts, size); } 601 void initialize_stubs_size(csize_t size) { initialize_section_size(&_stubs, size); } 602 // Override default oop recorder. 603 void initialize_oop_recorder(OopRecorder* r); 604 605 OopRecorder* oop_recorder() const { return _oop_recorder; } 606 CodeStrings& strings() { return _code_strings; } 607 608 address last_insn() const { return _last_insn; } 609 void set_last_insn(address a) { _last_insn = a; } 610 void clear_last_insn() { set_last_insn(NULL); } 611 612 void free_strings() { 613 if (!_code_strings.is_null()) { 614 _code_strings.free(); // sets _strings Null as a side-effect. 615 } 616 } 617 618 // Directly disassemble code buffer. 619 // Print the comment associated with offset on stream, if there is one. 620 virtual void print_block_comment(outputStream* stream, address block_begin) { 621 #ifndef PRODUCT 622 intptr_t offset = (intptr_t)(block_begin - _total_start); // I assume total_start is not correct for all code sections. 623 _code_strings.print_block_comment(stream, offset); 624 #endif 625 } 626 bool has_block_comment(address block_begin) { 627 #ifndef PRODUCT 628 intptr_t offset = (intptr_t)(block_begin - _total_start); // I assume total_start is not correct for all code sections. 629 return _code_strings.has_block_comment(offset); 630 #else 631 return false; 632 #endif 633 } 634 635 // Code generation 636 void relocate(address at, RelocationHolder const& rspec, int format = 0) { 637 _insts.relocate(at, rspec, format); 638 } 639 void relocate(address at, relocInfo::relocType rtype, int format = 0) { 640 _insts.relocate(at, rtype, format); 641 } 642 643 // Management of overflow storage for binding of Labels. 644 GrowableArray<int>* create_patch_overflow(); 645 646 // NMethod generation 647 void copy_code_and_locs_to(CodeBlob* blob) { 648 assert(blob != NULL, "sane"); 649 copy_relocations_to(blob); 650 copy_code_to(blob); 651 } 652 void copy_values_to(nmethod* nm) { 653 if (!oop_recorder()->is_unused()) { 654 oop_recorder()->copy_values_to(nm); 655 } 656 } 657 658 // Transform an address from the code in this code buffer to a specified code buffer 659 address transform_address(const CodeBuffer &cb, address addr) const; 660 661 void block_comment(intptr_t offset, const char * comment) PRODUCT_RETURN; 662 const char* code_string(const char* str) PRODUCT_RETURN_(return NULL;); 663 664 // Log a little info about section usage in the CodeBuffer 665 void log_section_sizes(const char* name); 666 667 #if INCLUDE_AOT 668 // True if this is a code buffer used for immutable PIC, i.e. AOT 669 // compilation. 670 bool immutable_PIC() { return _immutable_PIC; } 671 void set_immutable_PIC(bool pic) { _immutable_PIC = pic; } 672 #endif 673 674 #ifndef PRODUCT 675 public: 676 // Printing / Decoding 677 // decodes from decode_begin() to code_end() and sets decode_begin to end 678 void decode(); 679 void print(); 680 #endif 681 // Directly disassemble code buffer. 682 void decode(address start, address end); 683 684 // The following header contains architecture-specific implementations 685 #include CPU_HEADER(codeBuffer) 686 687 }; 688 689 690 inline void CodeSection::freeze() { 691 _outer->freeze_section(this); 692 } 693 694 inline bool CodeSection::maybe_expand_to_ensure_remaining(csize_t amount) { 695 if (remaining() < amount) { _outer->expand(this, amount); return true; } 696 return false; 697 } 698 699 #endif // SHARE_ASM_CODEBUFFER_HPP