98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
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#include "ikarus.h"
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#include <strings.h>
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#include <string.h>
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#include <stdlib.h>
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static ikp
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initialize_symbol_table(ikpcb* pcb){
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#define NUM_OF_BUCKETS 4096 /* power of 2 */
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int size = align_to_next_page(disp_vector_data + NUM_OF_BUCKETS * wordsize);
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ikp st = ik_mmap_ptr(size, 0, pcb) + vector_tag;
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bzero(st-vector_tag, size);
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ref(st, off_vector_length) = fix(NUM_OF_BUCKETS);
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pcb->oblist = st;
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return st;
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}
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static int
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compute_hash(ikp str){
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int len = unfix(ref(str, off_string_length));
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char* data = (char*) str + off_string_data;
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int h = len;
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char* last = data + len;
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while(data < last){
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char c = *data;
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h = h + c;
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h = h + (h << 10);
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h = h ^ (h >> 6);
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data++;
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}
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h = h + (h << 3);
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h = h ^ (h >> 11);
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h = h + (h << 15);
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return h;
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}
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static int strings_eqp(ikp str1, ikp str2){
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ikp len = ref(str1, off_string_length);
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if(len == ref(str2, off_string_length)){
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return
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(memcmp(str1+off_string_data, str2+off_string_data, unfix(len)) == 0);
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}
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return 0;
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}
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static ikp ik_make_symbol(ikp str, ikpcb* pcb){
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ikp sym = ik_alloc(pcb, symbol_size) + symbol_tag;
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ref(sym, off_symbol_string) = str;
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ref(sym, off_symbol_ustring) = false_object;
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ref(sym, off_symbol_value) = unbound_object;
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ref(sym, off_symbol_plist) = null_object;
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ref(sym, off_symbol_system_value) = str;
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ref(sym, off_symbol_system_plist) = null_object;
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return sym;
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}
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ikp ik_oblist(ikpcb* pcb){
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fprintf(stderr, "oblist dead!\n");
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exit(-1);
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}
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ikp ik_intern_string(ikp str, ikpcb* pcb){
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ikp st = pcb->oblist;
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if(st == 0){
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st = initialize_symbol_table(pcb);
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}
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int h = compute_hash(str);
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int idx = h & (unfix(ref(st, off_vector_length)) - 1);
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ikp bckt = ref(st, off_vector_data + idx*wordsize);
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ikp b = bckt;
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while(b){
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ikp sym = ref(b, off_car);
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ikp sym_str = ref(sym, off_symbol_string);
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if(strings_eqp(sym_str, str)){
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return sym;
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}
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b = ref(b, off_cdr);
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}
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ikp sym = ik_make_symbol(str, pcb);
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b = ik_alloc(pcb, pair_size) + pair_tag;
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ref(b, off_car) = sym;
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ref(b, off_cdr) = bckt;
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ref(st, off_vector_data + idx*wordsize) = b;
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pcb->dirty_vector[page_index(st+off_vector_data+idx*wordsize)] = -1;
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return sym;
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}
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ikp
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ik_cstring_to_symbol(char* str, ikpcb* pcb){
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int n = strlen(str);
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int size = n + disp_string_data + 1;
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ikp s = ik_alloc(pcb, align(size)) + string_tag;
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ref(s, off_string_length) = fix(n);
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memcpy(s+off_string_data, str, n+1);
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ikp sym = ik_intern_string(s, pcb);
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return sym;
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}
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