vm/vm.hpp

   1 namespace factor
   2 {
   3
   4 struct growable_array;
   5 struct code_root;
   6
   7 struct factor_vm
   8 {
   9         //
  10         // vvvvvv
  11         // THESE FIELDS ARE ACCESSED DIRECTLY FROM FACTOR. See:
  12         //   basis/vm/vm.factor
  13         //   basis/compiler/constants/constants.factor
  14
  15         /* Current context */
  16         context *ctx;
  17
  18         /* Spare context -- for callbacks */
  19         context *spare_ctx;
  20
  21         /* New objects are allocated here */
  22         nursery_space nursery;
  23
  24         /* Add this to a shifted address to compute write barrier offsets */
  25         cell cards_offset;
  26         cell decks_offset;
  27
  28         /* cdecl signal handler address, used by signal handler subprimitives */
  29         cell signal_handler_addr;
  30
  31         /* Various special objects, accessed by special-object and
  32         set-special-object primitives */
  33         cell special_objects[special_object_count];
  34
  35         // THESE FIELDS ARE ACCESSED DIRECTLY FROM FACTOR.
  36         // ^^^^^^
  37         //
  38
  39         /* Data stack and retain stack sizes */
  40         cell datastack_size, retainstack_size, callstack_size;
  41
  42         /* Stack of callback IDs */
  43         std::vector<int> callback_ids;
  44
  45         /* Next callback ID */
  46         int callback_id;
  47
  48         /* List of callback function descriptors for PPC */
  49         std::list<void **> function_descriptors;
  50
  51         /* Pooling unused contexts to make context allocation cheaper */
  52         std::list<context *> unused_contexts;
  53
  54         /* Active contexts, for tracing by the GC */
  55         std::set<context *> active_contexts;
  56
  57         /* Canonical truth value. In Factor, 't' */
  58         cell true_object;
  59
  60         /* External entry points */
  61         c_to_factor_func_type c_to_factor_func;
  62
  63         /* Is call counting enabled? */
  64         bool profiling_p;
  65         /* Is sampling profiler enabled? */
  66         bool sampling_p;
  67
  68         /* Global variables used to pass fault handler state from signal handler
  69         to VM */
  70         bool signal_resumable;
  71         bool signal_from_leaf; // XXX remove this once we're sure leaf works
  72         cell signal_number;
  73         cell signal_fault_addr;
  74         unsigned int signal_fpu_status;
  75         bool safepoint_fep;
  76         cell safepoint_sample_count;
  77         sigset_t safepoint_signals;
  78
  79         /* GC is off during heap walking */
  80         bool gc_off;
  81
  82         /* Data heap */
  83         data_heap *data;
  84
  85         /* Code heap */
  86         code_heap *code;
  87
  88         /* Pinned callback stubs */
  89         callback_heap *callbacks;
  90
  91         /* Only set if we're performing a GC */
  92         gc_state *current_gc;
  93
  94         /* Mark stack */
  95         std::vector<cell> mark_stack;
  96
  97         /* If not NULL, we push GC events here */
  98         std::vector<gc_event> *gc_events;
  99
 100         /* If a runtime function needs to call another function which potentially
 101            allocates memory, it must wrap any references to the data and code
 102            heaps with data_root and code_root smart pointers, which register
 103            themselves here. See data_roots.hpp and code_roots.hpp */
 104         std::vector<data_root_range> data_roots;
 105         std::vector<cell> bignum_roots;
 106         std::vector<code_root *> code_roots;
 107
 108         /* Debugger */
 109         bool fep_p;
 110         bool fep_disabled;
 111         bool full_output;
 112
 113         /* Canonical bignums */
 114         cell bignum_zero;
 115         cell bignum_pos_one;
 116         cell bignum_neg_one;
 117
 118         /* Method dispatch statistics */
 119         dispatch_statistics dispatch_stats;
 120
 121         /* Number of entries in a polymorphic inline cache */
 122         cell max_pic_size;
 123
 124         /* Incrementing object counter for identity hashing */
 125         cell object_counter;
 126
 127         /* Sanity check to ensure that monotonic counter doesn't
 128         decrease */
 129         u64 last_nano_count;
 130
 131         /* Stack for signal handlers, only used on Unix */
 132         segment *signal_callstack_seg;
 133
 134         // contexts
 135         context *new_context();
 136         void init_context(context *ctx);
 137         void delete_context(context *old_context);
 138         void init_contexts(cell datastack_size_, cell retainstack_size_, cell callstack_size_);
 139         void delete_contexts();
 140         cell begin_callback(cell quot);
 141         void end_callback();
 142         void primitive_current_callback();
 143         void primitive_context_object();
 144         void primitive_context_object_for();
 145         void primitive_set_context_object();
 146         cell stack_to_array(cell bottom, cell top);
 147         cell datastack_to_array(context *ctx);
 148         void primitive_datastack();
 149         void primitive_datastack_for();
 150         cell retainstack_to_array(context *ctx);
 151         void primitive_retainstack();
 152         void primitive_retainstack_for();
 153         cell array_to_stack(array *array, cell bottom);
 154         void set_datastack(context *ctx, array *array);
 155         void primitive_set_datastack();
 156         void set_retainstack(context *ctx, array *array);
 157         void primitive_set_retainstack();
 158         void primitive_check_datastack();
 159         void primitive_load_locals();
 160
 161         template<typename Iterator> void iterate_active_callstacks(Iterator &iter)
 162         {
 163                 std::set<context *>::const_iterator begin = active_contexts.begin();
 164                 std::set<context *>::const_iterator end = active_contexts.end();
 165                 while(begin != end) iterate_callstack(*begin++,iter);
 166         }
 167
 168         // run
 169         void primitive_exit();
 170         void primitive_nano_count();
 171         void primitive_sleep();
 172         void primitive_set_slot();
 173
 174         // objects
 175         void primitive_special_object();
 176         void primitive_set_special_object();
 177         void primitive_identity_hashcode();
 178         void compute_identity_hashcode(object *obj);
 179         void primitive_compute_identity_hashcode();
 180         cell object_size(cell tagged);
 181         cell clone_object(cell obj_);
 182         void primitive_clone();
 183         void primitive_become();
 184
 185         // profiler
 186         void init_profiler();
 187         code_block *compile_profiling_stub(cell word_);
 188         void set_profiling(bool profiling);
 189         void primitive_profiling();
 190
 191         // errors
 192         void general_error(vm_error_type error, cell arg1, cell arg2);
 193         void type_error(cell type, cell tagged);
 194         void not_implemented_error();
 195         void memory_protection_error(cell addr);
 196         void signal_error(cell signal);
 197         void divide_by_zero_error();
 198         void fp_trap_error(unsigned int fpu_status);
 199         void primitive_unimplemented();
 200         void memory_signal_handler_impl();
 201         void synchronous_signal_handler_impl();
 202         void fp_signal_handler_impl();
 203         void enqueue_safepoint_fep();
 204         void enqueue_safepoint_sample();
 205         void enqueue_safepoint_signal(cell signal);
 206         void handle_safepoint();
 207
 208         // bignum
 209         int bignum_equal_p(bignum * x, bignum * y);
 210         enum bignum_comparison bignum_compare(bignum * x, bignum * y);
 211         bignum *bignum_add(bignum * x, bignum * y);
 212         bignum *bignum_subtract(bignum * x, bignum * y);
 213         bignum *bignum_multiply(bignum * x, bignum * y);
 214         void bignum_divide(bignum * numerator, bignum * denominator, bignum * * quotient, bignum * * remainder);
 215         bignum *bignum_quotient(bignum * numerator, bignum * denominator);
 216         bignum *bignum_remainder(bignum * numerator, bignum * denominator);
 217         cell bignum_to_cell(bignum * bignum);
 218         fixnum bignum_to_fixnum(bignum * bignum);
 219         s64 bignum_to_long_long(bignum * bignum);
 220         u64 bignum_to_ulong_long(bignum * bignum);
 221         bignum *double_to_bignum(double x);
 222         int bignum_equal_p_unsigned(bignum * x, bignum * y);
 223         enum bignum_comparison bignum_compare_unsigned(bignum * x, bignum * y);
 224         bignum *bignum_add_unsigned(bignum * x, bignum * y, int negative_p);
 225         bignum *bignum_subtract_unsigned(bignum * x, bignum * y);
 226         bignum *bignum_multiply_unsigned(bignum * x, bignum * y, int negative_p);
 227         bignum *bignum_multiply_unsigned_small_factor(bignum * x, bignum_digit_type y,int negative_p);
 228         void bignum_destructive_add(bignum * bignum, bignum_digit_type n);
 229         void bignum_destructive_scale_up(bignum * bignum, bignum_digit_type factor);
 230         void bignum_divide_unsigned_large_denominator(bignum * numerator, bignum * denominator,
 231                                                         bignum * * quotient, bignum * * remainder, int q_negative_p, int r_negative_p);
 232         void bignum_divide_unsigned_normalized(bignum * u, bignum * v, bignum * q);
 233         bignum_digit_type bignum_divide_subtract(bignum_digit_type * v_start, bignum_digit_type * v_end,
 234                                                         bignum_digit_type guess, bignum_digit_type * u_start);
 235         void bignum_divide_unsigned_medium_denominator(bignum * numerator,bignum_digit_type denominator,
 236                                                         bignum * * quotient, bignum * * remainder,int q_negative_p, int r_negative_p);
 237         void bignum_destructive_normalization(bignum * source, bignum * target, int shift_left);
 238         void bignum_destructive_unnormalization(bignum * bignum, int shift_right);
 239         bignum_digit_type bignum_digit_divide(bignum_digit_type uh, bignum_digit_type ul,
 240                                                         bignum_digit_type v, bignum_digit_type * q) /* return value */;
 241         bignum_digit_type bignum_digit_divide_subtract(bignum_digit_type v1, bignum_digit_type v2,
 242                                                         bignum_digit_type guess, bignum_digit_type * u);
 243         void bignum_divide_unsigned_small_denominator(bignum * numerator, bignum_digit_type denominator,
 244                                                         bignum * * quotient, bignum * * remainder,int q_negative_p, int r_negative_p);
 245         bignum_digit_type bignum_destructive_scale_down(bignum * bignum, bignum_digit_type denominator);
 246         bignum * bignum_remainder_unsigned_small_denominator(bignum * n, bignum_digit_type d, int negative_p);
 247         bignum *bignum_digit_to_bignum(bignum_digit_type digit, int negative_p);
 248         bignum *allot_bignum(bignum_length_type length, int negative_p);
 249         bignum * allot_bignum_zeroed(bignum_length_type length, int negative_p);
 250         bignum *bignum_shorten_length(bignum * bignum, bignum_length_type length);
 251         bignum *bignum_trim(bignum * bignum);
 252         bignum *bignum_new_sign(bignum * x, int negative_p);
 253         bignum *bignum_maybe_new_sign(bignum * x, int negative_p);
 254         void bignum_destructive_copy(bignum * source, bignum * target);
 255         bignum *bignum_bitwise_not(bignum * x);
 256         bignum *bignum_arithmetic_shift(bignum * arg1, fixnum n);
 257         bignum *bignum_bitwise_and(bignum * arg1, bignum * arg2);
 258         bignum *bignum_bitwise_ior(bignum * arg1, bignum * arg2);
 259         bignum *bignum_bitwise_xor(bignum * arg1, bignum * arg2);
 260         bignum *bignum_magnitude_ash(bignum * arg1, fixnum n);
 261         bignum *bignum_pospos_bitwise_op(int op, bignum * arg1, bignum * arg2);
 262         bignum *bignum_posneg_bitwise_op(int op, bignum * arg1, bignum * arg2);
 263         bignum *bignum_negneg_bitwise_op(int op, bignum * arg1, bignum * arg2);
 264         void bignum_negate_magnitude(bignum * arg);
 265         bignum *bignum_integer_length(bignum * x);
 266         int bignum_logbitp(int shift, bignum * arg);
 267         int bignum_unsigned_logbitp(int shift, bignum * bignum);
 268
 269         //data heap
 270         void init_card_decks();
 271         void set_data_heap(data_heap *data_);
 272         void init_data_heap(cell young_size, cell aging_size, cell tenured_size);
 273         void primitive_size();
 274         data_heap_room data_room();
 275         void primitive_data_room();
 276         void begin_scan();
 277         void end_scan();
 278         cell instances(cell type);
 279         void primitive_all_instances();
 280
 281         template<typename Generation, typename Iterator>
 282         inline void each_object(Generation *gen, Iterator &iterator)
 283         {
 284                 cell obj = gen->first_object();
 285                 while(obj)
 286                 {
 287                         iterator((object *)obj);
 288                         obj = gen->next_object_after(obj);
 289                 }
 290         }
 291
 292         template<typename Iterator> inline void each_object(Iterator &iterator)
 293         {
 294                 gc_off = true;
 295
 296                 each_object(data->tenured,iterator);
 297                 each_object(data->aging,iterator);
 298                 each_object(data->nursery,iterator);
 299
 300                 gc_off = false;
 301         }
 302
 303         /* the write barrier must be called any time we are potentially storing a
 304            pointer from an older generation to a younger one */
 305         inline void write_barrier(cell *slot_ptr)
 306         {
 307                 *(char *)(cards_offset + ((cell)slot_ptr >> card_bits)) = card_mark_mask;
 308                 *(char *)(decks_offset + ((cell)slot_ptr >> deck_bits)) = card_mark_mask;
 309         }
 310
 311         inline void write_barrier(object *obj, cell size)
 312         {
 313                 cell start = (cell)obj & (~card_size + 1);
 314                 cell end = ((cell)obj + size + card_size - 1) & (~card_size + 1);
 315
 316                 for(cell offset = start; offset < end; offset += card_size)
 317                         write_barrier((cell *)offset);
 318         }
 319
 320         // data heap checker
 321         void check_data_heap();
 322
 323         // gc
 324         void end_gc();
 325         void set_current_gc_op(gc_op op);
 326         void start_gc_again();
 327         void update_code_heap_for_minor_gc(std::set<code_block *> *remembered_set);
 328         void collect_nursery();
 329         void collect_aging();
 330         void collect_to_tenured();
 331         void update_code_roots_for_sweep();
 332         void update_code_roots_for_compaction();
 333         void collect_mark_impl(bool trace_contexts_p);
 334         void collect_sweep_impl();
 335         void collect_full(bool trace_contexts_p);
 336         void collect_compact_impl(bool trace_contexts_p);
 337         void collect_compact_code_impl(bool trace_contexts_p);
 338         void collect_compact(bool trace_contexts_p);
 339         void collect_growing_heap(cell requested_size, bool trace_contexts_p);
 340         void gc(gc_op op, cell requested_size, bool trace_contexts_p);
 341         void scrub_context(context *ctx);
 342         void scrub_contexts();
 343         void primitive_minor_gc();
 344         void primitive_full_gc();
 345         void primitive_compact_gc();
 346         void primitive_enable_gc_events();
 347         void primitive_disable_gc_events();
 348         object *allot_object(cell type, cell size);
 349         object *allot_large_object(cell type, cell size);
 350
 351         template<typename Type> Type *allot(cell size)
 352         {
 353                 return (Type *)allot_object(Type::type_number,size);
 354         }
 355
 356         inline bool in_data_heap_p(cell pointer)
 357         {
 358                 return (pointer >= data->seg->start && pointer < data->seg->end);
 359         }
 360
 361         inline void check_data_pointer(object *pointer)
 362         {
 363         #ifdef FACTOR_DEBUG
 364                 if(!(current_gc && current_gc->op == collect_growing_heap_op))
 365                         assert(in_data_heap_p((cell)pointer));
 366         #endif
 367         }
 368
 369         // generic arrays
 370         template<typename Array> Array *allot_uninitialized_array(cell capacity);
 371         template<typename Array> bool reallot_array_in_place_p(Array *array, cell capacity);
 372         template<typename Array> Array *reallot_array(Array *array_, cell capacity);
 373
 374         // debug
 375         void print_chars(string* str);
 376         void print_word(word* word, cell nesting);
 377         void print_factor_string(string* str);
 378         void print_array(array* array, cell nesting);
 379         void print_tuple(tuple *tuple, cell nesting);
 380         void print_nested_obj(cell obj, fixnum nesting);
 381         void print_obj(cell obj);
 382         void print_objects(cell *start, cell *end);
 383         void print_datastack();
 384         void print_retainstack();
 385         void print_callstack();
 386         void dump_cell(cell x);
 387         void dump_memory(cell from, cell to);
 388         template<typename Generation> void dump_generation(const char *name, Generation *gen);
 389         void dump_generations();
 390         void dump_objects(cell type);
 391         void find_data_references_step(cell *scan);
 392         void find_data_references(cell look_for_);
 393         void dump_code_heap();
 394         void factorbug();
 395         void primitive_die();
 396
 397         // arrays
 398         inline void set_array_nth(array *array, cell slot, cell value);
 399         array *allot_array(cell capacity, cell fill_);
 400         void primitive_array();
 401         cell allot_array_1(cell obj_);
 402         cell allot_array_2(cell v1_, cell v2_);
 403         cell allot_array_4(cell v1_, cell v2_, cell v3_, cell v4_);
 404         void primitive_resize_array();
 405         cell std_vector_to_array(std::vector<cell> &elements);
 406
 407         // strings
 408         string *allot_string_internal(cell capacity);
 409         void fill_string(string *str_, cell start, cell capacity, cell fill);
 410         string *allot_string(cell capacity, cell fill);
 411         void primitive_string();
 412         bool reallot_string_in_place_p(string *str, cell capacity);
 413         string* reallot_string(string *str_, cell capacity);
 414         void primitive_resize_string();
 415         void primitive_set_string_nth_fast();
 416
 417         // booleans
 418         cell tag_boolean(cell untagged)
 419         {
 420                 return (untagged ? true_object : false_object);
 421         }
 422
 423         // byte arrays
 424         byte_array *allot_byte_array(cell size);
 425         void primitive_byte_array();
 426         void primitive_uninitialized_byte_array();
 427         void primitive_resize_byte_array();
 428
 429         template<typename Type> byte_array *byte_array_from_value(Type *value);
 430
 431         // tuples
 432         void primitive_tuple();
 433         void primitive_tuple_boa();
 434
 435         // words
 436         word *allot_word(cell name_, cell vocab_, cell hashcode_);
 437         void primitive_word();
 438         void primitive_word_code();
 439         void update_word_entry_point(word *w_);
 440         void primitive_optimized_p();
 441         void primitive_wrapper();
 442         void jit_compile_word(cell word_, cell def_, bool relocating);
 443         cell find_all_words();
 444         void compile_all_words();
 445
 446         // math
 447         void primitive_bignum_to_fixnum();
 448         void primitive_float_to_fixnum();
 449         void primitive_fixnum_divint();
 450         void primitive_fixnum_divmod();
 451         bignum *fixnum_to_bignum(fixnum);
 452         bignum *cell_to_bignum(cell);
 453         bignum *long_long_to_bignum(s64 n);
 454         bignum *ulong_long_to_bignum(u64 n);
 455         inline fixnum sign_mask(fixnum x);
 456         inline fixnum branchless_max(fixnum x, fixnum y);
 457         inline fixnum branchless_abs(fixnum x);
 458         void primitive_fixnum_shift();
 459         void primitive_fixnum_to_bignum();
 460         void primitive_float_to_bignum();
 461         void primitive_bignum_eq();
 462         void primitive_bignum_add();
 463         void primitive_bignum_subtract();
 464         void primitive_bignum_multiply();
 465         void primitive_bignum_divint();
 466         void primitive_bignum_divmod();
 467         void primitive_bignum_mod();
 468         void primitive_bignum_and();
 469         void primitive_bignum_or();
 470         void primitive_bignum_xor();
 471         void primitive_bignum_shift();
 472         void primitive_bignum_less();
 473         void primitive_bignum_lesseq();
 474         void primitive_bignum_greater();
 475         void primitive_bignum_greatereq();
 476         void primitive_bignum_not();
 477         void primitive_bignum_bitp();
 478         void primitive_bignum_log2();
 479         inline cell unbox_array_size();
 480         cell unbox_array_size_slow();
 481         void primitive_fixnum_to_float();
 482         void primitive_format_float();
 483         void primitive_float_eq();
 484         void primitive_float_add();
 485         void primitive_float_subtract();
 486         void primitive_float_multiply();
 487         void primitive_float_divfloat();
 488         void primitive_float_less();
 489         void primitive_float_lesseq();
 490         void primitive_float_greater();
 491         void primitive_float_greatereq();
 492         void primitive_float_bits();
 493         void primitive_bits_float();
 494         void primitive_double_bits();
 495         void primitive_bits_double();
 496         fixnum to_fixnum(cell tagged);
 497         cell to_cell(cell tagged);
 498         cell from_signed_8(s64 n);
 499         s64 to_signed_8(cell obj);
 500         cell from_unsigned_8(u64 n);
 501         u64 to_unsigned_8(cell obj);
 502         float to_float(cell value);
 503         double to_double(cell value);
 504         inline void overflow_fixnum_add(fixnum x, fixnum y);
 505         inline void overflow_fixnum_subtract(fixnum x, fixnum y);
 506         inline void overflow_fixnum_multiply(fixnum x, fixnum y);
 507         inline cell from_signed_cell(fixnum x);
 508         inline cell from_unsigned_cell(cell x);
 509         inline cell allot_float(double n);
 510         inline bignum *float_to_bignum(cell tagged);
 511         inline double untag_float(cell tagged);
 512         inline double untag_float_check(cell tagged);
 513         inline fixnum float_to_fixnum(cell tagged);
 514         inline double fixnum_to_float(cell tagged);
 515
 516         // tagged
 517         template<typename Type> Type *untag_check(cell value);
 518
 519         // io
 520         void init_c_io();
 521         void io_error();
 522         FILE* safe_fopen(char *filename, char *mode);
 523         int safe_fgetc(FILE *stream);
 524         size_t safe_fread(void *ptr, size_t size, size_t nitems, FILE *stream);
 525         void safe_fputc(int c, FILE* stream);
 526         size_t safe_fwrite(void *ptr, size_t size, size_t nitems, FILE *stream);
 527         int safe_ftell(FILE *stream);
 528         void safe_fseek(FILE *stream, off_t offset, int whence);
 529         void safe_fflush(FILE *stream);
 530         void safe_fclose(FILE *stream);
 531         void primitive_fopen();
 532         FILE *pop_file_handle();
 533         void primitive_fgetc();
 534         void primitive_fread();
 535         void primitive_fputc();
 536         void primitive_fwrite();
 537         void primitive_ftell();
 538         void primitive_fseek();
 539         void primitive_fflush();
 540         void primitive_fclose();
 541
 542         // code_block
 543         cell compute_entry_point_address(cell obj);
 544         cell compute_entry_point_pic_address(word *w, cell tagged_quot);
 545         cell compute_entry_point_pic_address(cell w_);
 546         cell compute_entry_point_pic_tail_address(cell w_);
 547         cell code_block_owner(code_block *compiled);
 548         void update_word_references(code_block *compiled, bool reset_inline_caches);
 549         void undefined_symbol();
 550         cell compute_dlsym_address(array *literals, cell index);
 551 #ifdef FACTOR_PPC
 552         cell compute_dlsym_toc_address(array *literals, cell index);
 553 #endif
 554         cell compute_vm_address(cell arg);
 555         void store_external_address(instruction_operand op);
 556         cell compute_here_address(cell arg, cell offset, code_block *compiled);
 557         void initialize_code_block(code_block *compiled, cell literals);
 558         void initialize_code_block(code_block *compiled);
 559         void fixup_labels(array *labels, code_block *compiled);
 560         code_block *allot_code_block(cell size, code_block_type type);
 561         code_block *add_code_block(code_block_type type, cell code_, cell labels_, cell owner_, cell relocation_, cell parameters_, cell literals_);
 562
 563         //code heap
 564         inline void check_code_pointer(cell ptr) { }
 565
 566         template<typename Iterator> void each_code_block(Iterator &iter)
 567         {
 568                 code->allocator->iterate(iter);
 569         }
 570
 571         void init_code_heap(cell size);
 572         bool in_code_heap_p(cell ptr);
 573         void update_code_heap_words(bool reset_inline_caches);
 574         void initialize_code_blocks();
 575         void primitive_modify_code_heap();
 576         code_heap_room code_room();
 577         void primitive_code_room();
 578         void primitive_strip_stack_traces();
 579         cell code_blocks();
 580         void primitive_code_blocks();
 581
 582         // callbacks
 583         void init_callbacks(cell size);
 584         void primitive_callback();
 585
 586         // image
 587         void init_objects(image_header *h);
 588         void load_data_heap(FILE *file, image_header *h, vm_parameters *p);
 589         void load_code_heap(FILE *file, image_header *h, vm_parameters *p);
 590         bool save_image(const vm_char *saving_filename, const vm_char *filename);
 591         void primitive_save_image();
 592         void primitive_save_image_and_exit();
 593         void fixup_data(cell data_offset, cell code_offset);
 594         void fixup_code(cell data_offset, cell code_offset);
 595         void load_image(vm_parameters *p);
 596
 597         // callstack
 598         template<typename Iterator> void iterate_callstack_object(callstack *stack_, Iterator &iterator);
 599         void check_frame(stack_frame *frame);
 600         callstack *allot_callstack(cell size);
 601         stack_frame *second_from_top_stack_frame(context *ctx);
 602         cell capture_callstack(context *ctx);
 603         void primitive_callstack();
 604         void primitive_callstack_for();
 605         code_block *frame_code(stack_frame *frame);
 606         code_block_type frame_type(stack_frame *frame);
 607         cell frame_executing(stack_frame *frame);
 608         cell frame_executing_quot(stack_frame *frame);
 609         stack_frame *frame_successor(stack_frame *frame);
 610         cell frame_scan(stack_frame *frame);
 611         cell frame_offset(stack_frame *frame);
 612         void set_frame_offset(stack_frame *frame, cell offset);
 613         void primitive_callstack_to_array();
 614         stack_frame *innermost_stack_frame(stack_frame *bottom, stack_frame *top);
 615         void primitive_innermost_stack_frame_executing();
 616         void primitive_innermost_stack_frame_scan();
 617         void primitive_set_innermost_stack_frame_quot();
 618         void primitive_callstack_bounds();
 619         template<typename Iterator> void iterate_callstack(context *ctx, Iterator &iterator);
 620         void dispatch_signal_handler(cell *sp, cell *pc, cell newpc);
 621         void dispatch_signal_handler_from_leaf(cell *sp, cell *pc, cell newpc);
 622
 623         template<typename CellA, typename CellB, typename CellC>
 624         void dispatch_signal_handler(CellA *sp, CellB *pc, CellC newpc)
 625         {
 626                 dispatch_signal_handler(
 627                         reinterpret_cast<cell*>(sp),
 628                         reinterpret_cast<cell*>(pc),
 629                         (cell)newpc
 630                 );
 631         }
 632
 633         // alien
 634         char *pinned_alien_offset(cell obj);
 635         cell allot_alien(cell delegate_, cell displacement);
 636         cell allot_alien(void *address);
 637         void primitive_displaced_alien();
 638         void primitive_alien_address();
 639         void *alien_pointer();
 640         void primitive_dlopen();
 641         void primitive_dlsym();
 642         void primitive_dlsym_raw();
 643         void primitive_dlclose();
 644         void primitive_dll_validp();
 645         char *alien_offset(cell obj);
 646
 647         // quotations
 648         void primitive_jit_compile();
 649         code_block *lazy_jit_compile_block();
 650         void primitive_array_to_quotation();
 651         void primitive_quotation_code();
 652         void set_quot_entry_point(quotation *quot, code_block *code);
 653         code_block *jit_compile_quot(cell owner_, cell quot_, bool relocating);
 654         void jit_compile_quot(cell quot_, bool relocating);
 655         fixnum quot_code_offset_to_scan(cell quot_, cell offset);
 656         cell lazy_jit_compile(cell quot);
 657         bool quot_compiled_p(quotation *quot);
 658         void primitive_quot_compiled_p();
 659         cell find_all_quotations();
 660         void initialize_all_quotations();
 661
 662         // dispatch
 663         cell search_lookup_alist(cell table, cell klass);
 664         cell search_lookup_hash(cell table, cell klass, cell hashcode);
 665         cell nth_superclass(tuple_layout *layout, fixnum echelon);
 666         cell nth_hashcode(tuple_layout *layout, fixnum echelon);
 667         cell lookup_tuple_method(cell obj, cell methods);
 668         cell lookup_method(cell obj, cell methods);
 669         void primitive_lookup_method();
 670         cell object_class(cell obj);
 671         cell method_cache_hashcode(cell klass, array *array);
 672         void update_method_cache(cell cache, cell klass, cell method);
 673         void primitive_mega_cache_miss();
 674         void primitive_reset_dispatch_stats();
 675         void primitive_dispatch_stats();
 676
 677         // inline cache
 678         void init_inline_caching(int max_size);
 679         void deallocate_inline_cache(cell return_address);
 680         cell determine_inline_cache_type(array *cache_entries);
 681         void update_pic_count(cell type);
 682         code_block *compile_inline_cache(fixnum index,cell generic_word_,cell methods_,cell cache_entries_,bool tail_call_p);
 683         void *megamorphic_call_stub(cell generic_word);
 684         cell inline_cache_size(cell cache_entries);
 685         cell add_inline_cache_entry(cell cache_entries_, cell klass_, cell method_);
 686         void update_pic_transitions(cell pic_size);
 687         void *inline_cache_miss(cell return_address);
 688
 689         // entry points
 690         void c_to_factor(cell quot);
 691         template<typename Func> Func get_entry_point(cell n);
 692         void unwind_native_frames(cell quot, stack_frame *to);
 693         cell get_fpu_state();
 694         void set_fpu_state(cell state);
 695
 696         // factor
 697         void default_parameters(vm_parameters *p);
 698         bool factor_arg(const vm_char *str, const vm_char *arg, cell *value);
 699         void init_parameters_from_args(vm_parameters *p, int argc, vm_char **argv);
 700         void prepare_boot_image();
 701         void init_factor(vm_parameters *p);
 702         void pass_args_to_factor(int argc, vm_char **argv);
 703         void start_factor(vm_parameters *p);
 704         void stop_factor();
 705         void start_embedded_factor(vm_parameters *p);
 706         void start_standalone_factor(int argc, vm_char **argv);
 707         char *factor_eval_string(char *string);
 708         void factor_eval_free(char *result);
 709         void factor_yield();
 710         void factor_sleep(long us);
 711
 712         // os-*
 713         void primitive_existsp();
 714         void move_file(const vm_char *path1, const vm_char *path2);
 715         void init_ffi();
 716         void ffi_dlopen(dll *dll);
 717         void *ffi_dlsym(dll *dll, symbol_char *symbol);
 718         void *ffi_dlsym_raw(dll *dll, symbol_char *symbol);
 719  #ifdef FACTOR_PPC
 720         void *ffi_dlsym_toc(dll *dll, symbol_char *symbol);
 721  #endif
 722         void ffi_dlclose(dll *dll);
 723         void c_to_factor_toplevel(cell quot);
 724         void init_signals();
 725
 726         // os-windows
 727   #if defined(WINDOWS)
 728         const vm_char *vm_executable_path();
 729         const vm_char *default_image_path();
 730         void windows_image_path(vm_char *full_path, vm_char *temp_path, unsigned int length);
 731         BOOL windows_stat(vm_char *path);
 732
 733   #if defined(WINNT)
 734         void open_console();
 735         LONG exception_handler(PEXCEPTION_RECORD e, void *frame, PCONTEXT c, void *dispatch);
 736         BOOL ctrl_handler(DWORD dwCtrlType);
 737   #endif
 738
 739   #else  // UNIX
 740         void dispatch_signal(void *uap, void (handler)());
 741         void unix_init_signals();
 742   #endif
 743
 744   #ifdef __APPLE__
 745         void call_fault_handler(exception_type_t exception, exception_data_type_t code, MACH_EXC_STATE_TYPE *exc_state, MACH_THREAD_STATE_TYPE *thread_state, MACH_FLOAT_STATE_TYPE *float_state);
 746   #endif
 747
 748         factor_vm();
 749         ~factor_vm();
 750 };
 751
 752 }