77 lines
1.4 KiB
C
77 lines
1.4 KiB
C
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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#ifndef NORCSID
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static char rcsid[]= "$Header$";
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#endif
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#include "param.h"
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#include "expr.h"
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#include <em_spec.h>
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#include <em_flag.h>
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extern char em_mnem[][4];
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#define HASHSIZE (2*(sp_lmnem-sp_fmnem))
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struct emhashmnem {
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char h_name[3];
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char h_value;
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} emhashmnem[HASHSIZE];
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initemhash() {
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register i;
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for(i=0;i<=sp_lmnem-sp_fmnem;i++)
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enter(em_mnem[i],i+sp_fmnem);
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}
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unsigned emhash(name) register char *name; {
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register unsigned sum;
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register i;
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for (sum=i=0;*name;i+=3)
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sum ^= (*name++)<<(i&07);
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return(sum);
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}
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enter(name,value) char *name; {
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register unsigned h;
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h=emhash(name)%HASHSIZE;
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while (emhashmnem[h].h_name[0] != 0)
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h = (h+1)%HASHSIZE;
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strncpy(emhashmnem[h].h_name,name,3);
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emhashmnem[h].h_value = value;
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}
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int mlookup(name) char *name; {
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register unsigned h;
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h = emhash(name)%HASHSIZE;
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while (strncmp(emhashmnem[h].h_name,name,3) != 0 &&
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emhashmnem[h].h_name[0] != 0)
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h = (h+1)%HASHSIZE;
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return(emhashmnem[h].h_value&0xFF); /* 0 if not found */
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}
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extern char em_flag[];
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argtyp(mn) {
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switch(em_flag[mn-sp_fmnem]&EM_PAR) {
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case PAR_W:
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case PAR_S:
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case PAR_Z:
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case PAR_O:
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case PAR_N:
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case PAR_L:
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case PAR_F:
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case PAR_R:
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case PAR_C:
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return(TYPINT);
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default:
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return(TYPADDR);
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}
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}
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