--- /dev/null
+/* assym.c */
+
+/*
+ * (C) Copyright 1989-1995
+ * All Rights Reserved
+ *
+ * Alan R. Baldwin
+ * 721 Berkeley St.
+ * Kent, Ohio 44240
+ *
+ * 10-Nov-07 borutr:
+ * - use strsto instead StoreString and include it in assym.c
+ * for compatibility with the original asxxxx
+ * - applied changes from 28-Oct-97 JLH:
+ * - lookup: Use StoreString for sym construction
+ * - change symeq() to do length-independent string compare
+ * - change hash() to do length-independent hash calculation
+ * - applied changes from 29-Oct-97 JLH:
+ * - make mnemonics case insensitive ALWAYS
+ * - make hash() case-insensitive always
+ * - replace symeq() call in mlookup with strcmpi
+ */
+
+#include <stdio.h>
+#include <setjmp.h>
+#include <string.h>
+#include <stdlib.h>
+#include "asm.h"
+
+/*)Module assym.c
+ *
+ * The module assym.c contains the functions that operate
+ * on the mnemonic/directive and symbol structures.
+ *
+ * assym.c contains the following functions:
+ * VOID allglob()
+ * area * alookup()
+ * int hash()
+ * sym * lookup()
+ * mne * mlookup()
+ * VOID * new()
+ * int symeq()
+ * VOID syminit()
+ * VOID symglob()
+ *
+ * assym.c contains no local/static variables.
+ */
+
+/*)Function VOID syminit()
+ *
+ * The function syminit() is called early in the game
+ * to set up the hashtables. First all buckets in a
+ * table are cleared. Then a pass is made through
+ * the respective symbol lists, linking them into
+ * their hash buckets. Finally the base area pointer
+ * is set to 'dca'.
+ *
+ * local variables:
+ * int h computed hash value
+ * mne * mp pointer to a mne structure
+ * mne ** mpp pointer to an array of
+ * mne structure pointers
+ * sym * sp pointer to a sym structure
+ * sym ** spp pointer to an array of
+ * sym structure pointers
+ *
+ * global variables:
+ * area area[] single elememt area array
+ * area dca defined as area[0]
+ * mne * mnehash[] array of pointers to NHASH
+ * linked mnemonic/directive lists
+ * sym * symhash[] array of pointers to NHASH
+ * linked symbol lists
+ *
+ * functions called:
+ * none
+ *
+ * side effects:
+ * (1) The symbol hash tables are initialized,
+ * the only defined symbol is '.'.
+ * (2) The mnemonic/directive hash tables are
+ * initialized with the assembler directives
+ * and mnemonics found in the machine dependent
+ * file ___pst.c.
+ * (3) The area pointer is initialized to dca (area[0]).
+ */
+
+VOID
+syminit(void)
+{
+ register struct mne *mp;
+ struct mne **mpp;
+ register struct sym *sp;
+ struct sym **spp;
+ register int h;
+
+ mpp = &mnehash[0];
+ while (mpp < &mnehash[NHASH])
+ *mpp++ = NULL;
+ mp = &mne[0];
+ for (;;) {
+ h = hash(mp->m_id);
+ mp->m_mp = mnehash[h];
+ mnehash[h] = mp;
+ if (mp->m_flag&S_END)
+ break;
+ ++mp;
+ }
+
+ spp = &symhash[0];
+ while (spp < &symhash[NHASH])
+ *spp++ = NULL;
+ sp = &sym[0];
+ for (;;) {
+ h = hash(sp->s_id);
+ sp->s_sp = symhash[h];
+ symhash[h] = sp;
+ if (sp->s_flag&S_END)
+ break;
+ ++sp;
+ }
+
+ areap = &dca;
+}
+
+/*)Function area * alookup(id)
+ *
+ * char * id area name string
+ *
+ * The function alookup() searches the area list for a
+ * match with id. If the area is defined then a pointer
+ * to this area is returned else a NULL is returned.
+ *
+ * local variables:
+ * area * ap pointer to area structure
+ *
+ * global variables:
+ * area * areap pointer to an area structure
+ *
+ * functions called:
+ * int symeq() assym.c
+ *
+ * side effects:
+ * none
+ */
+
+struct area *
+alookup(char *id)
+{
+ register struct area *ap;
+
+ ap = areap;
+ while (ap) {
+ if (symeq(id, ap->a_id)) {
+ return (ap);
+ }
+ ap = ap->a_ap;
+ }
+ return(NULL);
+}
+
+/*)Function mne * mlookup(id)
+ *
+ * char * id mnemonic/directive name string
+ *
+ * The function mlookup() searches the mnemonic/directive
+ * hash tables for a match returning a pointer to the
+ * mne structure else it returns a NULL.
+ *
+ * local variables:
+ * mne * mp pointer to mne structure
+ * int h calculated hash value
+ *
+ * global variables:
+ * mne * mnehash[] array of pointers to NHASH
+ * linked mnemonic/directive lists
+ *
+ * functions called:
+ * none
+ *
+ * side effects:
+ * none
+ */
+
+struct mne *
+mlookup(char *id)
+{
+ register struct mne *mp;
+ register int h;
+
+ h = hash(id);
+ mp = mnehash[h];
+ while (mp) {
+ if (as_strcmpi(id, mp->m_id) == 0) /* JLH: case insensitive */
+ return (mp);
+ mp = mp->m_mp;
+ }
+ return (NULL);
+}
+
+/*)Function sym * lookup(id)
+ *
+ * char * id symbol name string
+ *
+ * The function lookup() searches the symbol hash tables for
+ * a symbol name match returning a pointer to the sym structure.
+ * If the symbol is not found then a sym structure is created,
+ * initialized, and linked to the appropriate hash table.
+ * A pointer to this new sym structure is returned.
+ *
+ * local variables:
+ * int h computed hash value
+ * sym * sp pointer to a sym structure
+ *
+ * global varaibles:
+ * sym * symhash[] array of pointers to NHASH
+ * linked symbol lists
+ *
+ * functions called:
+ * int hash() assym.c
+ * VOID * new() assym.c
+ * int symeq() assym.c
+ *
+ * side effects:
+ * If the function new() fails to allocate space
+ * for the new sym structure the assembly terminates.
+ */
+
+struct sym *
+lookup(char *id)
+{
+ register struct sym *sp;
+ register int h;
+
+ h = hash(id);
+ sp = symhash[h];
+ while (sp) {
+ if (symeq(id, sp->s_id))
+ return (sp);
+ sp = sp->s_sp;
+ }
+ sp = (struct sym *) new (sizeof(struct sym));
+ sp->s_sp = symhash[h];
+ symhash[h] = sp;
+ sp->s_tsym = NULL;
+ sp->s_id = strsto(id);
+ sp->s_type = S_NEW;
+ sp->s_flag = 0;
+ sp->s_area = NULL;
+ sp->s_ref = 0;
+ sp->s_addr = 0;
+ return (sp);
+}
+
+/*)Function VOID symglob()
+ *
+ * The function symglob() will mark all symbols of
+ * type S_NEW as global. Called at the beginning of pass 1
+ * if the assembly option -g was specified.
+ *
+ * local variables:
+ * sym * sp pointer to a sym structure
+ * int i loop index
+ *
+ * global variables:
+ * sym * symhash[] array of pointers to NHASH
+ * linked symbol lists
+ *
+ * functions called:
+ * none
+ *
+ * side effects:
+ * Symbol types changed.
+ */
+
+VOID
+symglob(void)
+{
+ register struct sym *sp;
+ register int i;
+
+ for (i=0; i<NHASH; ++i) {
+ sp = symhash[i];
+ while (sp != NULL) {
+ if (sp->s_type == S_NEW)
+ sp->s_flag |= S_GBL;
+ sp = sp->s_sp;
+ }
+ }
+}
+
+/*)Function VOID allglob()
+ *
+ * The function allglob() will mark all symbols of
+ * type S_USER as global. Called at the beginning of pass 1
+ * if the assembly option -a was specified.
+ *
+ * local variables:
+ * sym * sp pointer to a sym structure
+ * int i loop index
+ *
+ * global variables:
+ * sym * symhash[] array of pointers to NHASH
+ * linked symbol lists
+ *
+ * functions called:
+ * none
+ *
+ * side effects:
+ * Symbol types changed.
+ */
+
+VOID
+allglob(void)
+{
+ register struct sym *sp;
+ register int i;
+
+ for (i=0; i<NHASH; ++i) {
+ sp = symhash[i];
+ while (sp != NULL) {
+ if (sp != &dot && sp->s_type == S_USER)
+ sp->s_flag |= S_GBL;
+ sp = sp->s_sp;
+ }
+ }
+}
+
+/*)Function int symeq(p1, p2)
+ *
+ * char * p1 name string
+ * char * p2 name string
+ *
+ * The function symeq() compares the two name strings for a match.
+ * The return value is 1 for a match and 0 for no match.
+ *
+ * local variables:
+ * int h loop counter
+ *
+ * global variables:
+ * char ccase[] an array of characters which
+ * perform the case translation function
+ *
+ * functions called:
+ * none
+ *
+ * side effects:
+ * none
+ *
+ */
+
+int
+symeq(char *p1, char *p2)
+{
+#if CASE_SENSITIVE
+ return (strcmp( p1, p2 ) == 0);
+#else
+ return (as_strcmpi( p1, p2 ) == 0);
+#endif
+}
+
+/*)Function int hash(p)
+ *
+ * char * p pointer to string to hash
+ *
+ * The function hash() computes a hash code using the sum
+ * of all characters mod table size algorithm.
+ *
+ * local variables:
+ * int h accumulated character sum
+ * int n loop counter
+ *
+ * global variables:
+ * char ccase[] an array of characters which
+ * perform the case translation function
+ *
+ * functions called:
+ * none
+ *
+ * side effects:
+ * none
+ */
+
+int
+hash(char *p)
+{
+ register int h;
+
+ h = 0;
+ while (*p) {
+ /* JLH: case insensitive hash: Doesn't much affect
+ * hashing, and allows same function for mnemonics and symbols
+ */
+ h += ccase[(int)*p++];
+ }
+ return (h&HMASK);
+}
+
+/*)Function char * strsto(str)
+ *
+ * char * str pointer to string to save
+ *
+ * Allocate space for "str", copy str into new space.
+ * Return a pointer to the allocated string.
+ *
+ * This function based on code by
+ * John L. Hartman
+ * jhartman at compuserve dot com
+ *
+ * local variables:
+ * int l string length + 1
+ * int bytes bytes remaining in buffer area
+ * char * p pointer to head of copied string
+ * char * pnext next location in buffer area
+ *
+ * global variables:
+ * none
+ *
+ * functions called:
+ * VOID * new() assym.c
+ * char * strncpy() c_library
+ *
+ * side effects:
+ * Space allocated for string, string copied
+ * to space. Out of Space terminates assembler.
+ */
+
+/*
+ * To avoid wasting memory headers on small allocations, we
+ * allocate a big chunk and parcel it out as required.
+ * These static variables remember our hunk
+ */
+
+#define STR_SPC 1024
+static char * pnext = NULL;
+static int bytes = 0;
+
+char *
+strsto(char *str)
+{
+ int l;
+ char *p;
+
+ /*
+ * What we need, including a null.
+ */
+ l = strlen(str) + 1;
+
+ if (l > bytes) {
+ /*
+ * No space. Allocate a new hunk.
+ * We lose the pointer to any old hunk.
+ * We don't care, as the names are never deleted.
+ */
+ pnext = (char *) new (STR_SPC);
+ bytes = STR_SPC;
+ }
+
+ /*
+ * Copy the name and terminating null.
+ */
+ p = pnext;
+ strncpy(p, str, l);
+
+ pnext += l;
+ bytes -= l;
+
+ return(p);
+}
+
+/*)Function VOID * new(n)
+ *
+ * unsigned int n allocation size in bytes
+ *
+ * The function new() allocates n bytes of space and returns
+ * a pointer to this memory. If no space is available the
+ * assembly is terminated.
+ *
+ * local variables:
+ * VOID * p a general pointer
+ *
+ * global variables:
+ * none
+ *
+ * functions called:
+ * VOID asexit() asmain.c
+ * int fprintf() c_library
+ * VOID * malloc() c_library
+ *
+ * side effects:
+ * Memory is allocated, if allocation fails
+ * the assembly is terminated.
+ */
+
+VOID *
+new(unsigned int n)
+{
+ register VOID *p;
+
+ if ((p = (VOID *) malloc(n)) == NULL) {
+ fprintf(stderr, "Out of space!\n");
+ asexit(1);
+ }
+ return (p);
+}
projects / fw / sdcc / blobdiff