148 lines
3.6 KiB
C
148 lines
3.6 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_TUPLE *tuple = untag_object(object);
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F_TUPLE_LAYOUT *layout = untag_object(tuple->layout);
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F_ARRAY *echelons = untag_object(methods);
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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",methods);
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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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return array_nth(hi_tag_methods,hi_tag(object) - HEADER_TYPE);
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}
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static CELL method_cache_hashcode(CELL key, F_ARRAY *array)
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{
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CELL capacity = (array_capacity(array) >> 1) - 1;
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return ((key >> TAG_BITS) & capacity) << 1;
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}
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static CELL lookup_cached_method(CELL key, CELL method_cache)
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{
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F_ARRAY *array = untag_object(method_cache);
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CELL hashcode = method_cache_hashcode(key,array);
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if(array_nth(array,hashcode) == key)
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return array_nth(array,hashcode + 1);
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else
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return F;
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}
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static void update_method_cache(CELL key, CELL method_cache, CELL method)
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{
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F_ARRAY *array = untag_object(method_cache);
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CELL hashcode = method_cache_hashcode(key,array);
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set_array_nth(array,hashcode,key);
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set_array_nth(array,hashcode + 1,method);
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}
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static CELL lookup_method(CELL object, CELL methods, CELL method_cache)
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{
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F_ARRAY *tag_methods = untag_object(methods);
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if(!HI_TAG_OR_TUPLE_P(object))
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return array_nth(tag_methods,TAG(object));
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else
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{
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CELL key = get(HI_TAG_HEADER(object));
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CELL method = lookup_cached_method(key,method_cache);
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if(method != F)
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return method;
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else
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{
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method = array_nth(tag_methods,TAG(object));
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if(type_of(method) != WORD_TYPE)
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{
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switch(TAG(object))
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{
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case TUPLE_TYPE:
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method = lookup_tuple_method(object,method);
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break;
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case OBJECT_TYPE:
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method = lookup_hi_tag_method(object,method);
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break;
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default:
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critical_error("Bad methods array",methods);
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break;
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}
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}
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update_method_cache(key,method_cache,method);
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return method;
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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 method_cache = get(ds);
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CELL methods = get(ds - CELLS);
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CELL object = get(ds - CELLS * 2);
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ds -= CELLS * 2;
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drepl(lookup_method(object,methods,method_cache));
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}
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