factor/vm/vm.hpp

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namespace factor
{
struct growable_array;
struct factor_vm
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{
// First five fields accessed directly by assembler. See vm.factor
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/* Current stacks */
context *ctx;
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/* New objects are allocated here */
nursery_space nursery;
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/* Add this to a shifted address to compute write barrier offsets */
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cell cards_offset;
cell decks_offset;
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/* TAGGED user environment data; see getenv/setenv prims */
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cell special_objects[special_object_count];
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/* Data stack and retain stack sizes */
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cell ds_size, rs_size;
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/* Pooling unused contexts to make callbacks cheaper */
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context *unused_contexts;
/* Canonical truth value. In Factor, 't' */
cell true_object;
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/* Is call counting enabled? */
bool profiling_p;
/* Global variables used to pass fault handler state from signal handler to
user-space */
cell signal_number;
cell signal_fault_addr;
unsigned int signal_fpu_status;
stack_frame *signal_callstack_top;
/* A heap walk allows useful things to be done, like finding all
references to an object for debugging purposes. */
cell heap_scan_ptr;
/* GC is off during heap walking */
bool gc_off;
/* GC logging */
bool verbosegc;
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/* Data heap */
data_heap *data;
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/* Code heap */
code_heap *code;
/* Pinned callback stubs */
callback_heap *callbacks;
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/* Only set if we're performing a GC */
gc_state *current_gc;
/* Statistics */
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gc_statistics gc_stats;
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/* If a runtime function needs to call another function which potentially
allocates memory, it must wrap any local variable references to Factor
objects in gc_root instances */
std::vector<cell> gc_locals;
std::vector<cell> gc_bignums;
/* Debugger */
bool fep_disabled;
bool full_output;
/* Canonical bignums */
cell bignum_zero;
cell bignum_pos_one;
cell bignum_neg_one;
/* Method dispatch statistics */
cell megamorphic_cache_hits;
cell megamorphic_cache_misses;
cell cold_call_to_ic_transitions;
cell ic_to_pic_transitions;
cell pic_to_mega_transitions;
/* Indexed by PIC_TAG, PIC_HI_TAG, PIC_TUPLE, PIC_HI_TAG_TUPLE */
cell pic_counts[4];
/* Number of entries in a polymorphic inline cache */
cell max_pic_size;
// contexts
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void reset_datastack();
void reset_retainstack();
void fix_stacks();
void save_stacks();
context *alloc_context();
void dealloc_context(context *old_context);
void nest_stacks(stack_frame *magic_frame);
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void unnest_stacks();
void init_stacks(cell ds_size_, cell rs_size_);
bool stack_to_array(cell bottom, cell top);
cell array_to_stack(array *array, cell bottom);
void primitive_datastack();
void primitive_retainstack();
void primitive_set_datastack();
void primitive_set_retainstack();
void primitive_check_datastack();
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template<typename Iterator> void iterate_active_frames(Iterator &iter)
{
context *ctx = this->ctx;
while(ctx)
{
iterate_callstack(ctx,iter);
if(ctx->magic_frame) iter(ctx->magic_frame);
ctx = ctx->next;
}
}
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// run
void primitive_getenv();
void primitive_setenv();
void primitive_exit();
void primitive_micros();
void primitive_sleep();
void primitive_set_slot();
void primitive_load_locals();
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cell clone_object(cell obj_);
void primitive_clone();
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// profiler
void init_profiler();
code_block *compile_profiling_stub(cell word_);
void set_profiling(bool profiling);
void primitive_profiling();
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// errors
void throw_error(cell error, stack_frame *callstack_top);
void not_implemented_error();
bool in_page(cell fault, cell area, cell area_size, int offset);
void memory_protection_error(cell addr, stack_frame *native_stack);
void signal_error(int signal, stack_frame *native_stack);
void divide_by_zero_error();
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void fp_trap_error(unsigned int fpu_status, stack_frame *signal_callstack_top);
void primitive_call_clear();
void primitive_unimplemented();
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void memory_signal_handler_impl();
void misc_signal_handler_impl();
void fp_signal_handler_impl();
void type_error(cell type, cell tagged);
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void general_error(vm_error_type error, cell arg1, cell arg2, stack_frame *native_stack);
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// bignum
int bignum_equal_p(bignum * x, bignum * y);
enum bignum_comparison bignum_compare(bignum * x, bignum * y);
bignum *bignum_add(bignum * x, bignum * y);
bignum *bignum_subtract(bignum * x, bignum * y);
bignum *bignum_multiply(bignum * x, bignum * y);
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void bignum_divide(bignum * numerator, bignum * denominator, bignum * * quotient, bignum * * remainder);
bignum *bignum_quotient(bignum * numerator, bignum * denominator);
bignum *bignum_remainder(bignum * numerator, bignum * denominator);
cell bignum_to_cell(bignum * bignum);
fixnum bignum_to_fixnum(bignum * bignum);
s64 bignum_to_long_long(bignum * bignum);
u64 bignum_to_ulong_long(bignum * bignum);
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double bignum_to_double(bignum * bignum);
bignum *double_to_bignum(double x);
int bignum_equal_p_unsigned(bignum * x, bignum * y);
enum bignum_comparison bignum_compare_unsigned(bignum * x, bignum * y);
bignum *bignum_add_unsigned(bignum * x, bignum * y, int negative_p);
bignum *bignum_subtract_unsigned(bignum * x, bignum * y);
bignum *bignum_multiply_unsigned(bignum * x, bignum * y, int negative_p);
bignum *bignum_multiply_unsigned_small_factor(bignum * x, bignum_digit_type y,int negative_p);
void bignum_destructive_add(bignum * bignum, bignum_digit_type n);
void bignum_destructive_scale_up(bignum * bignum, bignum_digit_type factor);
void bignum_divide_unsigned_large_denominator(bignum * numerator, bignum * denominator,
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bignum * * quotient, bignum * * remainder, int q_negative_p, int r_negative_p);
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void bignum_divide_unsigned_normalized(bignum * u, bignum * v, bignum * q);
bignum_digit_type bignum_divide_subtract(bignum_digit_type * v_start, bignum_digit_type * v_end,
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bignum_digit_type guess, bignum_digit_type * u_start);
void bignum_divide_unsigned_medium_denominator(bignum * numerator,bignum_digit_type denominator,
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bignum * * quotient, bignum * * remainder,int q_negative_p, int r_negative_p);
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void bignum_destructive_normalization(bignum * source, bignum * target, int shift_left);
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void bignum_destructive_unnormalization(bignum * bignum, int shift_right);
bignum_digit_type bignum_digit_divide(bignum_digit_type uh, bignum_digit_type ul,
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bignum_digit_type v, bignum_digit_type * q) /* return value */;
bignum_digit_type bignum_digit_divide_subtract(bignum_digit_type v1, bignum_digit_type v2,
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bignum_digit_type guess, bignum_digit_type * u);
void bignum_divide_unsigned_small_denominator(bignum * numerator, bignum_digit_type denominator,
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bignum * * quotient, bignum * * remainder,int q_negative_p, int r_negative_p);
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bignum_digit_type bignum_destructive_scale_down(bignum * bignum, bignum_digit_type denominator);
bignum * bignum_remainder_unsigned_small_denominator(bignum * n, bignum_digit_type d, int negative_p);
bignum *bignum_digit_to_bignum(bignum_digit_type digit, int negative_p);
bignum *allot_bignum(bignum_length_type length, int negative_p);
bignum * allot_bignum_zeroed(bignum_length_type length, int negative_p);
bignum *bignum_shorten_length(bignum * bignum, bignum_length_type length);
bignum *bignum_trim(bignum * bignum);
bignum *bignum_new_sign(bignum * x, int negative_p);
bignum *bignum_maybe_new_sign(bignum * x, int negative_p);
void bignum_destructive_copy(bignum * source, bignum * target);
bignum *bignum_bitwise_not(bignum * x);
bignum *bignum_arithmetic_shift(bignum * arg1, fixnum n);
bignum *bignum_bitwise_and(bignum * arg1, bignum * arg2);
bignum *bignum_bitwise_ior(bignum * arg1, bignum * arg2);
bignum *bignum_bitwise_xor(bignum * arg1, bignum * arg2);
bignum *bignum_magnitude_ash(bignum * arg1, fixnum n);
bignum *bignum_pospos_bitwise_op(int op, bignum * arg1, bignum * arg2);
bignum *bignum_posneg_bitwise_op(int op, bignum * arg1, bignum * arg2);
bignum *bignum_negneg_bitwise_op(int op, bignum * arg1, bignum * arg2);
void bignum_negate_magnitude(bignum * arg);
bignum *bignum_integer_length(bignum * x);
int bignum_logbitp(int shift, bignum * arg);
int bignum_unsigned_logbitp(int shift, bignum * bignum);
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bignum *digit_stream_to_bignum(unsigned int n_digits, unsigned int (*producer)(unsigned int, factor_vm *), unsigned int radix, int negative_p);
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//data heap
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void init_card_decks();
void set_data_heap(data_heap *data_);
void init_data_heap(cell young_size, cell aging_size, cell tenured_size);
void primitive_size();
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cell binary_payload_start(object *pointer);
void primitive_data_room();
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void begin_scan();
void end_scan();
void primitive_begin_scan();
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cell next_object();
void primitive_next_object();
void primitive_end_scan();
template<typename Iterator> void each_object(Iterator &iterator);
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cell find_all_words();
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cell object_size(cell tagged);
/* the write barrier must be called any time we are potentially storing a
pointer from an older generation to a younger one */
inline void write_barrier(cell *slot_ptr)
{
*(char *)(cards_offset + ((cell)slot_ptr >> card_bits)) = card_mark_mask;
*(char *)(decks_offset + ((cell)slot_ptr >> deck_bits)) = card_mark_mask;
}
// gc
void update_code_heap_for_minor_gc(std::set<code_block *> *remembered_set);
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void collect_nursery();
void collect_aging();
void collect_to_tenured();
void collect_full_impl(bool trace_contexts_p);
void collect_growing_heap(cell requested_bytes, bool trace_contexts_p, bool compact_code_heap_p);
void collect_full(bool trace_contexts_p, bool compact_code_heap_p);
void record_gc_stats(generation_statistics *stats);
void gc(gc_op op, cell requested_bytes, bool trace_contexts_p, bool compact_code_heap_p);
void primitive_minor_gc();
void primitive_full_gc();
void primitive_compact_gc();
void primitive_gc_stats();
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void clear_gc_stats();
void primitive_become();
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void inline_gc(cell *gc_roots_base, cell gc_roots_size);
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object *allot_object(header header, cell size);
void add_gc_stats(generation_statistics *stats, growable_array *result);
void primitive_clear_gc_stats();
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template<typename Type> Type *allot(cell size)
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{
return (Type *)allot_object(header(Type::type_number),size);
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}
inline void check_data_pointer(object *pointer)
{
#ifdef FACTOR_DEBUG
if(!(current_gc && current_gc->op == collect_growing_heap_op))
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{
assert((cell)pointer >= data->seg->start
&& (cell)pointer < data->seg->end);
}
#endif
}
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// generic arrays
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template<typename Array> Array *allot_uninitialized_array(cell capacity);
template<typename Array> bool reallot_array_in_place_p(Array *array, cell capacity);
template<typename Array> Array *reallot_array(Array *array_, cell capacity);
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//debug
void print_chars(string* str);
void print_word(word* word, cell nesting);
void print_factor_string(string* str);
void print_array(array* array, cell nesting);
void print_tuple(tuple *tuple, cell nesting);
void print_nested_obj(cell obj, fixnum nesting);
void print_obj(cell obj);
void print_objects(cell *start, cell *end);
void print_datastack();
void print_retainstack();
void print_callstack();
void dump_cell(cell x);
void dump_memory(cell from, cell to);
template<typename Generation> void dump_generation(const char *name, Generation *gen);
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void dump_generations();
void dump_objects(cell type);
void find_data_references_step(cell *scan);
void find_data_references(cell look_for_);
void dump_code_heap();
void factorbug();
void primitive_die();
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//arrays
array *allot_array(cell capacity, cell fill_);
void primitive_array();
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cell allot_array_1(cell obj_);
cell allot_array_2(cell v1_, cell v2_);
cell allot_array_4(cell v1_, cell v2_, cell v3_, cell v4_);
void primitive_resize_array();
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inline void set_array_nth(array *array, cell slot, cell value);
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//strings
cell string_nth(const string *str, cell index);
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void set_string_nth_fast(string *str, cell index, cell ch);
void set_string_nth_slow(string *str_, cell index, cell ch);
void set_string_nth(string *str, cell index, cell ch);
string *allot_string_internal(cell capacity);
void fill_string(string *str_, cell start, cell capacity, cell fill);
string *allot_string(cell capacity, cell fill);
void primitive_string();
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bool reallot_string_in_place_p(string *str, cell capacity);
string* reallot_string(string *str_, cell capacity);
void primitive_resize_string();
void primitive_string_nth();
void primitive_set_string_nth_fast();
void primitive_set_string_nth_slow();
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//booleans
void box_boolean(bool value);
bool to_boolean(cell value);
inline cell tag_boolean(cell untagged);
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//byte arrays
byte_array *allot_byte_array(cell size);
void primitive_byte_array();
void primitive_uninitialized_byte_array();
void primitive_resize_byte_array();
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//tuples
tuple *allot_tuple(cell layout_);
void primitive_tuple();
void primitive_tuple_boa();
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//words
word *allot_word(cell name_, cell vocab_, cell hashcode_);
void primitive_word();
void primitive_word_xt();
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void update_word_xt(cell w_);
void primitive_optimized_p();
void primitive_wrapper();
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//math
void primitive_bignum_to_fixnum();
void primitive_float_to_fixnum();
void primitive_fixnum_divint();
void primitive_fixnum_divmod();
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bignum *fixnum_to_bignum(fixnum);
bignum *cell_to_bignum(cell);
bignum *long_long_to_bignum(s64 n);
bignum *ulong_long_to_bignum(u64 n);
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inline fixnum sign_mask(fixnum x);
inline fixnum branchless_max(fixnum x, fixnum y);
inline fixnum branchless_abs(fixnum x);
void primitive_fixnum_shift();
void primitive_fixnum_to_bignum();
void primitive_float_to_bignum();
void primitive_bignum_eq();
void primitive_bignum_add();
void primitive_bignum_subtract();
void primitive_bignum_multiply();
void primitive_bignum_divint();
void primitive_bignum_divmod();
void primitive_bignum_mod();
void primitive_bignum_and();
void primitive_bignum_or();
void primitive_bignum_xor();
void primitive_bignum_shift();
void primitive_bignum_less();
void primitive_bignum_lesseq();
void primitive_bignum_greater();
void primitive_bignum_greatereq();
void primitive_bignum_not();
void primitive_bignum_bitp();
void primitive_bignum_log2();
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unsigned int bignum_producer(unsigned int digit);
void primitive_byte_array_to_bignum();
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cell unbox_array_size();
void primitive_fixnum_to_float();
void primitive_bignum_to_float();
void primitive_str_to_float();
void primitive_float_to_str();
void primitive_float_eq();
void primitive_float_add();
void primitive_float_subtract();
void primitive_float_multiply();
void primitive_float_divfloat();
void primitive_float_mod();
void primitive_float_less();
void primitive_float_lesseq();
void primitive_float_greater();
void primitive_float_greatereq();
void primitive_float_bits();
void primitive_bits_float();
void primitive_double_bits();
void primitive_bits_double();
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fixnum to_fixnum(cell tagged);
cell to_cell(cell tagged);
void box_signed_1(s8 n);
void box_unsigned_1(u8 n);
void box_signed_2(s16 n);
void box_unsigned_2(u16 n);
void box_signed_4(s32 n);
void box_unsigned_4(u32 n);
void box_signed_cell(fixnum integer);
void box_unsigned_cell(cell cell);
void box_signed_8(s64 n);
s64 to_signed_8(cell obj);
void box_unsigned_8(u64 n);
u64 to_unsigned_8(cell obj);
void box_float(float flo);
float to_float(cell value);
void box_double(double flo);
double to_double(cell value);
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inline void overflow_fixnum_add(fixnum x, fixnum y);
inline void overflow_fixnum_subtract(fixnum x, fixnum y);
inline void overflow_fixnum_multiply(fixnum x, fixnum y);
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inline cell allot_integer(fixnum x);
inline cell allot_cell(cell x);
inline cell allot_float(double n);
inline bignum *float_to_bignum(cell tagged);
inline double bignum_to_float(cell tagged);
inline double untag_float(cell tagged);
inline double untag_float_check(cell tagged);
inline fixnum float_to_fixnum(cell tagged);
inline double fixnum_to_float(cell tagged);
// tagged
template<typename Type> Type *untag_check(cell value);
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//io
void init_c_io();
void io_error();
void primitive_fopen();
void primitive_fgetc();
void primitive_fread();
void primitive_fputc();
void primitive_fwrite();
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void primitive_ftell();
void primitive_fseek();
void primitive_fflush();
void primitive_fclose();
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//code_block
relocation_type relocation_type_of(relocation_entry r);
relocation_class relocation_class_of(relocation_entry r);
cell relocation_offset_of(relocation_entry r);
void flush_icache_for(code_block *block);
int number_of_parameters(relocation_type type);
void *object_xt(cell obj);
void *xt_pic(word *w, cell tagged_quot);
void *word_xt_pic(word *w);
void *word_xt_pic_tail(word *w);
void undefined_symbol();
void *get_rel_symbol(array *literals, cell index);
cell compute_relocation(relocation_entry rel, cell index, code_block *compiled);
template<typename Iterator> void iterate_relocations(code_block *compiled, Iterator &iter);
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void store_address_2_2(cell *ptr, cell value);
void store_address_masked(cell *ptr, fixnum value, cell mask, fixnum shift);
void store_address_in_code_block(cell klass, cell offset, fixnum absolute_value);
void update_literal_references(code_block *compiled);
void relocate_code_block_step(relocation_entry rel, cell index, code_block *compiled);
void update_word_references(code_block *compiled);
void update_code_block_words_and_literals(code_block *compiled);
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void check_code_address(cell address);
void relocate_code_block(code_block *compiled);
void fixup_labels(array *labels, code_block *compiled);
code_block *allot_code_block(cell size, code_block_type type);
code_block *add_code_block(code_block_type type, cell code_, cell labels_, cell owner_, cell relocation_, cell literals_);
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//code heap
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inline void check_code_pointer(cell ptr)
{
#ifdef FACTOR_DEBUG
assert(in_code_heap_p(ptr));
#endif
}
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void init_code_heap(cell size);
bool in_code_heap_p(cell ptr);
void jit_compile_word(cell word_, cell def_, bool relocate);
void update_code_heap_words();
void update_code_heap_words_and_literals();
void relocate_code_heap();
void primitive_modify_code_heap();
void primitive_code_room();
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void forward_object_xts();
void forward_context_xts();
void forward_callback_xts();
void compact_code_heap(bool trace_contexts_p);
void primitive_strip_stack_traces();
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/* Apply a function to every code block */
template<typename Iterator> struct code_heap_iterator {
Iterator &iter;
explicit code_heap_iterator(Iterator &iter_) : iter(iter_) {}
void operator()(heap_block *block, cell size)
{
iter((code_block *)block,size);
}
};
template<typename Iterator> void iterate_code_heap(Iterator &iter_)
{
code_heap_iterator<Iterator> iter(iter_);
code->allocator->iterate(iter);
}
//callbacks
void init_callbacks(cell size);
void primitive_callback();
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//image
void init_objects(image_header *h);
void load_data_heap(FILE *file, image_header *h, vm_parameters *p);
void load_code_heap(FILE *file, image_header *h, vm_parameters *p);
bool save_image(const vm_char *filename);
void primitive_save_image();
void primitive_save_image_and_exit();
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void data_fixup(cell *handle, cell data_relocation_base);
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template<typename Type> void code_fixup(Type **handle, cell code_relocation_base);
void fixup_word(word *word, cell code_relocation_base);
void fixup_quotation(quotation *quot, cell code_relocation_base);
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void fixup_alien(alien *d);
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void fixup_callstack_object(callstack *stack, cell code_relocation_base);
void relocate_object(object *object, cell data_relocation_base, cell code_relocation_base);
void relocate_data(cell data_relocation_base, cell code_relocation_base);
void fixup_code_block(code_block *compiled, cell data_relocation_base);
void relocate_code(cell data_relocation_base);
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void load_image(vm_parameters *p);
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//callstack
template<typename Iterator> void iterate_callstack_object(callstack *stack_, Iterator &iterator);
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void check_frame(stack_frame *frame);
callstack *allot_callstack(cell size);
stack_frame *fix_callstack_top(stack_frame *top, stack_frame *bottom);
stack_frame *capture_start();
void primitive_callstack();
void primitive_set_callstack();
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code_block *frame_code(stack_frame *frame);
code_block_type frame_type(stack_frame *frame);
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cell frame_executing(stack_frame *frame);
stack_frame *frame_successor(stack_frame *frame);
cell frame_scan(stack_frame *frame);
void primitive_callstack_to_array();
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stack_frame *innermost_stack_frame(callstack *stack);
stack_frame *innermost_stack_frame_quot(callstack *callstack);
void primitive_innermost_stack_frame_executing();
void primitive_innermost_stack_frame_scan();
void primitive_set_innermost_stack_frame_quot();
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void save_callstack_bottom(stack_frame *callstack_bottom);
template<typename Iterator> void iterate_callstack(context *ctx, Iterator &iterator);
/* Every object has a regular representation in the runtime, which makes GC
much simpler. Every slot of the object until binary_payload_start is a pointer
to some other object. */
template<typename Iterator> void do_slots(cell obj, Iterator &iter)
{
cell scan = obj;
cell payload_start = binary_payload_start((object *)obj);
cell end = obj + payload_start;
scan += sizeof(cell);
while(scan < end)
{
iter((cell *)scan);
scan += sizeof(cell);
}
}
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//alien
char *pinned_alien_offset(cell obj);
cell allot_alien(cell delegate_, cell displacement);
void primitive_displaced_alien();
void primitive_alien_address();
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void *alien_pointer();
void primitive_dlopen();
void primitive_dlsym();
void primitive_dlclose();
void primitive_dll_validp();
void primitive_vm_ptr();
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char *alien_offset(cell obj);
char *unbox_alien();
void box_alien(void *ptr);
void to_value_struct(cell src, void *dest, cell size);
void box_value_struct(void *src, cell size);
void box_small_struct(cell x, cell y, cell size);
void box_medium_struct(cell x1, cell x2, cell x3, cell x4, cell size);
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//quotations
void primitive_jit_compile();
void primitive_array_to_quotation();
void primitive_quotation_xt();
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void set_quot_xt(quotation *quot, code_block *code);
void jit_compile(cell quot_, bool relocating);
void compile_all_words();
fixnum quot_code_offset_to_scan(cell quot_, cell offset);
cell lazy_jit_compile_impl(cell quot_, stack_frame *stack);
void primitive_quot_compiled_p();
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//dispatch
cell search_lookup_alist(cell table, cell klass);
cell search_lookup_hash(cell table, cell klass, cell hashcode);
cell nth_superclass(tuple_layout *layout, fixnum echelon);
cell nth_hashcode(tuple_layout *layout, fixnum echelon);
cell lookup_tuple_method(cell obj, cell methods);
cell lookup_hi_tag_method(cell obj, cell methods);
cell lookup_hairy_method(cell obj, cell methods);
cell lookup_method(cell obj, cell methods);
void primitive_lookup_method();
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cell object_class(cell obj);
cell method_cache_hashcode(cell klass, array *array);
void update_method_cache(cell cache, cell klass, cell method);
void primitive_mega_cache_miss();
void primitive_reset_dispatch_stats();
void primitive_dispatch_stats();
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//inline cache
void init_inline_caching(int max_size);
void deallocate_inline_cache(cell return_address);
cell determine_inline_cache_type(array *cache_entries);
void update_pic_count(cell type);
code_block *compile_inline_cache(fixnum index,cell generic_word_,cell methods_,cell cache_entries_,bool tail_call_p);
void *megamorphic_call_stub(cell generic_word);
cell inline_cache_size(cell cache_entries);
cell add_inline_cache_entry(cell cache_entries_, cell klass_, cell method_);
void update_pic_transitions(cell pic_size);
void *inline_cache_miss(cell return_address);
void primitive_reset_inline_cache_stats();
void primitive_inline_cache_stats();
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//factor
void default_parameters(vm_parameters *p);
bool factor_arg(const vm_char* str, const vm_char* arg, cell* value);
void init_parameters_from_args(vm_parameters *p, int argc, vm_char **argv);
void do_stage1_init();
void init_factor(vm_parameters *p);
void pass_args_to_factor(int argc, vm_char **argv);
void start_factor(vm_parameters *p);
void start_embedded_factor(vm_parameters *p);
void start_standalone_factor(int argc, vm_char **argv);
char *factor_eval_string(char *string);
void factor_eval_free(char *result);
void factor_yield();
void factor_sleep(long us);
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// os-*
void primitive_existsp();
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void init_ffi();
void ffi_dlopen(dll *dll);
void *ffi_dlsym(dll *dll, symbol_char *symbol);
void ffi_dlclose(dll *dll);
void c_to_factor_toplevel(cell quot);
// os-windows
#if defined(WINDOWS)
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void sleep_micros(u64 usec);
const vm_char *vm_executable_path();
const vm_char *default_image_path();
void windows_image_path(vm_char *full_path, vm_char *temp_path, unsigned int length);
bool windows_stat(vm_char *path);
#if defined(WINNT)
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void open_console();
LONG exception_handler(PEXCEPTION_POINTERS pe);
#endif
#else // UNIX
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void dispatch_signal(void *uap, void (handler)());
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#endif
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#ifdef __APPLE__
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);
#endif
factor_vm();
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};
extern std::map<THREADHANDLE, factor_vm *> thread_vms;
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}