109 lines
2.5 KiB
C
109 lines
2.5 KiB
C
#include "master.h"
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static CELL search_lookup_alist(CELL table, CELL class)
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{
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F_ARRAY *pairs = untag_object(table);
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F_FIXNUM index = array_capacity(pairs) - 1;
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while(index >= 0)
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{
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F_ARRAY *pair = untag_object(array_nth(pairs,index));
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if(array_nth(pair,0) == class)
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return array_nth(pair,1);
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else
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index--;
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}
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return F;
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}
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static CELL search_lookup_hash(CELL table, CELL class, CELL hashcode)
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{
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F_ARRAY *buckets = untag_object(table);
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CELL bucket = array_nth(buckets,hashcode & (array_capacity(buckets) - 1));
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if(type_of(bucket) == WORD_TYPE || bucket == F)
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return bucket;
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else
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return search_lookup_alist(bucket,class);
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}
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static CELL nth_superclass(F_TUPLE_LAYOUT *layout, F_FIXNUM echelon)
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{
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CELL *ptr = (CELL *)(layout + 1);
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return ptr[echelon * 2];
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}
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static CELL nth_hashcode(F_TUPLE_LAYOUT *layout, F_FIXNUM echelon)
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{
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CELL *ptr = (CELL *)(layout + 1);
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return ptr[echelon * 2 + 1];
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}
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static CELL lookup_tuple_method(CELL object, CELL methods)
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{
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F_ARRAY *echelons = untag_object(methods);
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F_TUPLE *tuple = untag_object(object);
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F_TUPLE_LAYOUT *layout = untag_object(tuple->layout);
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F_FIXNUM echelon = untag_fixnum_fast(layout->echelon);
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F_FIXNUM max_echelon = array_capacity(echelons) - 1;
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if(echelon > max_echelon) echelon = max_echelon;
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while(echelon >= 0)
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{
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CELL echelon_methods = array_nth(echelons,echelon);
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if(type_of(echelon_methods) == WORD_TYPE)
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return echelon_methods;
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else if(echelon_methods != F)
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{
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CELL class = nth_superclass(layout,echelon);
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CELL hashcode = untag_fixnum_fast(nth_hashcode(layout,echelon));
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CELL result = search_lookup_hash(echelon_methods,class,hashcode);
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if(result != F)
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return result;
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}
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echelon--;
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}
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critical_error("Cannot find tuple method",object);
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return F;
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}
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static CELL lookup_hi_tag_method(CELL object, CELL methods)
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{
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F_ARRAY *hi_tag_methods = untag_object(methods);
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CELL hi_tag = object_type(object);
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return array_nth(hi_tag_methods,hi_tag - HEADER_TYPE);
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}
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static CELL lookup_method(CELL object, CELL methods)
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{
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F_ARRAY *tag_methods = untag_object(methods);
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CELL tag = TAG(object);
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CELL element = array_nth(tag_methods,tag);
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if(type_of(element) == WORD_TYPE)
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return element;
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else
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{
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switch(tag)
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{
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case TUPLE_TYPE:
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return lookup_tuple_method(object,element);
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case OBJECT_TYPE:
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return lookup_hi_tag_method(object,element);
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default:
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critical_error("Bad methods array",methods);
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return F;
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}
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}
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}
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void primitive_lookup_method(void)
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{
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CELL methods = dpop();
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CELL object = dpop();
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dpush(lookup_method(object,methods));
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}
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