173 lines
3.7 KiB
C
Executable File
173 lines
3.7 KiB
C
Executable File
#include "master.h"
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void reset_datastack(void)
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{
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ds = ds_bot - CELLS;
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}
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void reset_retainstack(void)
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{
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rs = rs_bot - CELLS;
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}
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#define RESERVED (64 * CELLS)
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void fix_stacks(void)
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{
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if(ds + CELLS < ds_bot || ds + RESERVED >= ds_top) reset_datastack();
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if(rs + CELLS < rs_bot || rs + RESERVED >= rs_top) reset_retainstack();
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}
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/* called before entry into foreign C code. Note that ds and rs might
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be stored in registers, so callbacks must save and restore the correct values */
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void save_stacks(void)
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{
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if(stack_chain)
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{
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stack_chain->datastack = ds;
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stack_chain->retainstack = rs;
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}
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}
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/* called on entry into a compiled callback */
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void nest_stacks(void)
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{
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F_CONTEXT *new_stacks = safe_malloc(sizeof(F_CONTEXT));
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new_stacks->callstack_bottom = (F_STACK_FRAME *)-1;
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new_stacks->callstack_top = (F_STACK_FRAME *)-1;
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/* note that these register values are not necessarily valid stack
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pointers. they are merely saved non-volatile registers, and are
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restored in unnest_stacks(). consider this scenario:
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- factor code calls C function
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- C function saves ds/cs registers (since they're non-volatile)
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- C function clobbers them
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- C function calls Factor callback
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- Factor callback returns
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- C function restores registers
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- C function returns to Factor code */
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new_stacks->datastack_save = ds;
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new_stacks->retainstack_save = rs;
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/* save per-callback userenv */
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new_stacks->current_callback_save = userenv[CURRENT_CALLBACK_ENV];
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new_stacks->catchstack_save = userenv[CATCHSTACK_ENV];
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new_stacks->datastack_region = alloc_segment(ds_size);
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new_stacks->retainstack_region = alloc_segment(rs_size);
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new_stacks->next = stack_chain;
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stack_chain = new_stacks;
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reset_datastack();
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reset_retainstack();
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}
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/* called when leaving a compiled callback */
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void unnest_stacks(void)
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{
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dealloc_segment(stack_chain->datastack_region);
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dealloc_segment(stack_chain->retainstack_region);
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ds = stack_chain->datastack_save;
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rs = stack_chain->retainstack_save;
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/* restore per-callback userenv */
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userenv[CURRENT_CALLBACK_ENV] = stack_chain->current_callback_save;
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userenv[CATCHSTACK_ENV] = stack_chain->catchstack_save;
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F_CONTEXT *old_stacks = stack_chain;
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stack_chain = old_stacks->next;
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free(old_stacks);
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}
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/* called on startup */
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void init_stacks(CELL ds_size_, CELL rs_size_)
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{
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ds_size = ds_size_;
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rs_size = rs_size_;
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stack_chain = NULL;
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}
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bool stack_to_array(CELL bottom, CELL top)
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{
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F_FIXNUM depth = (F_FIXNUM)(top - bottom + CELLS);
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if(depth < 0)
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return false;
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else
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{
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F_ARRAY *a = allot_array_internal(ARRAY_TYPE,depth / CELLS);
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memcpy(a + 1,(void*)bottom,depth);
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dpush(tag_object(a));
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return true;
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}
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}
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DEFINE_PRIMITIVE(datastack)
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{
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if(!stack_to_array(ds_bot,ds))
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general_error(ERROR_DS_UNDERFLOW,F,F,NULL);
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}
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DEFINE_PRIMITIVE(retainstack)
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{
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if(!stack_to_array(rs_bot,rs))
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general_error(ERROR_RS_UNDERFLOW,F,F,NULL);
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}
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/* returns pointer to top of stack */
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CELL array_to_stack(F_ARRAY *array, CELL bottom)
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{
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CELL depth = array_capacity(array) * CELLS;
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memcpy((void*)bottom,array + 1,depth);
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return bottom + depth - CELLS;
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}
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DEFINE_PRIMITIVE(set_datastack)
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{
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ds = array_to_stack(untag_array(dpop()),ds_bot);
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}
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DEFINE_PRIMITIVE(set_retainstack)
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{
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rs = array_to_stack(untag_array(dpop()),rs_bot);
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}
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DEFINE_PRIMITIVE(getenv)
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{
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F_FIXNUM e = untag_fixnum_fast(dpeek());
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drepl(userenv[e]);
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}
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DEFINE_PRIMITIVE(setenv)
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{
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F_FIXNUM e = untag_fixnum_fast(dpop());
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CELL value = dpop();
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userenv[e] = value;
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}
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DEFINE_PRIMITIVE(exit)
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{
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exit(to_fixnum(dpop()));
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}
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DEFINE_PRIMITIVE(millis)
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{
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box_unsigned_8(current_millis());
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}
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DEFINE_PRIMITIVE(sleep)
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{
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sleep_millis(to_cell(dpop()));
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}
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DEFINE_PRIMITIVE(set_slot)
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{
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F_FIXNUM slot = untag_fixnum_fast(dpop());
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CELL obj = dpop();
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CELL value = dpop();
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set_slot(obj,slot,value);
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}
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