-/* lksym.c */
+/* lksym.c
+
+ Copyright (C) 1989-1995 Alan R. Baldwin
+ 721 Berkeley St., Kent, Ohio 44240
+
+This program is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 3, or (at your option) any
+later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>. */
/*
- * (C) Copyright 1989-1995
- * All Rights Reserved
- *
- * Alan R. Baldwin
- * 721 Berkeley St.
- * Kent, Ohio 44240
- *
- * 28-Oct-97 JLH:
- * - lkpsym: Use StoreString for sym construction
- * - change symeq() to do length-independent string compare
- * - change hash() to do length-independent hash calculation
+ * 28-Oct-97 JLH:
+ * - lkpsym: Use StoreString for sym construction
+ * - change symeq() to do length-independent string compare
+ * - change hash() to do length-independent hash calculation
*/
#include <stdio.h>
#include <stdlib.h>
#include "aslink.h"
-/*)Module lksym.c
- *
- * The module lksym.c contains the functions that operate
- * on the symbol structures.
- *
- * lksym.c contains the following functions:
- * int hash()
- * sym * lkpsym()
- * VOID * new()
- * sym * newsym()
- * VOID symdef()
- * int symeq()
- * VOID syminit()
- * VOID symmod()
- * Addr_T symval()
- *
- * lksym.c contains no local/static variables.
+/*)Module lksym.c
+ *
+ * The module lksym.c contains the functions that operate
+ * on the symbol structures.
+ *
+ * lksym.c contains the following functions:
+ * int hash()
+ * sym * lkpsym()
+ * VOID * new()
+ * sym * newsym()
+ * VOID symdef()
+ * int symeq()
+ * VOID syminit()
+ * VOID symmod()
+ * Addr_T symval()
+ *
+ * lksym.c contains no local/static variables.
*/
-/*)Function VOID syminit()
+/*)Function VOID syminit()
*
- * The function syminit() is called to clear the hashtable.
+ * The function syminit() is called to clear the hashtable.
*
- * local variables:
- * int h computed hash value
- * sym ** spp pointer to an array of
- * sym structure pointers
+ * local variables:
+ * int h computed hash value
+ * sym ** spp pointer to an array of
+ * sym structure pointers
*
- * global variables:
- * sym * symhash[] array of pointers to NHASH
- * linked symbol lists
+ * global variables:
+ * sym * symhash[] array of pointers to NHASH
+ * linked symbol lists
*
- * functions called:
- * none
+ * functions called:
+ * none
*
- * side effects:
- * (1) The symbol hash tables are cleared
+ * side effects:
+ * (1) The symbol hash tables are cleared
*/
VOID
syminit(void)
{
- struct sym **spp;
+ struct sym **spp;
- spp = &symhash[0];
- while (spp < &symhash[NHASH])
- *spp++ = NULL;
+ spp = &symhash[0];
+ while (spp < &symhash[NHASH])
+ *spp++ = NULL;
}
-/*)Function sym * newsym()
- *
- * The function newsym() is called to evaluate the symbol
- * definition/reference directive from the .rel file(s).
- * If the symbol is not found in the symbol table a new
- * symbol structure is created. Evaluation of the
- * directive determines if this is a reference or a definition.
- * Multiple definitions of the same variable will be flagged
- * as an error if the values are not identical. A symbol
- * definition places the symbol value and area extension
- * into the symbols data structure. And finally, a pointer
- * to the symbol structure is placed into the head structure
- * symbol list. Refer to the description of the header, symbol,
- * area, and areax structures in lkdata.c for structure and
- * linkage details.
- *
- * local variables:
- * int c character from input text
- * int i evaluation value
- * char id[] symbol name
- * int nglob number of symbols in this header
- * sym * tsp pointer to symbol structure
- * sym ** s list of pointers to symbol structures
- *
- * global variables:
- * areax *axp Pointer to the current
- * areax structure
- * head *headp The pointer to the first
- * head structure of a linked list
- * int lkerr error flag
- *
- * functions called:
- * Addr_T eval() lkeval.c
- * VOID exit() c_library
- * int fprintf() c_library
- * char getSid() lklex.c
- * char get() lklex.c
- * char getnb() lklex.c
- * sym * lkpsym() lksym.c
- *
- * side effects:
- * A symbol structure is created and/or modified.
- * If structure space allocation fails linker will abort.
- * Several severe errors (these are internal errors
- * indicating a corrupted .rel file or corrupted
- * assembler or linker) will terminated the linker.
+/*)Function sym * newsym()
+ *
+ * The function newsym() is called to evaluate the symbol
+ * definition/reference directive from the .rel file(s).
+ * If the symbol is not found in the symbol table a new
+ * symbol structure is created. Evaluation of the
+ * directive determines if this is a reference or a definition.
+ * Multiple definitions of the same variable will be flagged
+ * as an error if the values are not identical. A symbol
+ * definition places the symbol value and area extension
+ * into the symbols data structure. And finally, a pointer
+ * to the symbol structure is placed into the head structure
+ * symbol list. Refer to the description of the header, symbol,
+ * area, and areax structures in lkdata.c for structure and
+ * linkage details.
+ *
+ * local variables:
+ * int c character from input text
+ * int i evaluation value
+ * char id[] symbol name
+ * int nglob number of symbols in this header
+ * sym * tsp pointer to symbol structure
+ * sym ** s list of pointers to symbol structures
+ *
+ * global variables:
+ * areax *axp Pointer to the current
+ * areax structure
+ * head *headp The pointer to the first
+ * head structure of a linked list
+ * int lkerr error flag
+ *
+ * functions called:
+ * Addr_T eval() lkeval.c
+ * VOID exit() c_library
+ * int fprintf() c_library
+ * char getSid() lklex.c
+ * char get() lklex.c
+ * char getnb() lklex.c
+ * sym * lkpsym() lksym.c
+ *
+ * side effects:
+ * A symbol structure is created and/or modified.
+ * If structure space allocation fails linker will abort.
+ * Several severe errors (these are internal errors
+ * indicating a corrupted .rel file or corrupted
+ * assembler or linker) will terminated the linker.
*/
/*
{
register unsigned i ;
register unsigned nglob ;
- register int c ;
- struct sym *tsp;
- struct sym **s;
- char id[NCPS];
-
- getSid(id); // old: getid(id, -1);
- tsp = lkpsym(id, 1);
- c = getnb();get();get();
- if (c == 'R') {
- tsp->s_type |= S_REF;
- if (eval()) {
- fprintf(stderr, "Non zero S_REF\n");
- lkerr++;
- }
- } else
- if (c == 'D') {
- i = eval();
- if (tsp->s_type & S_DEF && tsp->s_addr != i) {
- fprintf(stderr, "Multiple definition of %s\n", id);
- lkerr++;
- }
- tsp->s_type |= S_DEF;
- /*
- * Set value and area extension link.
- */
- tsp->s_addr = i;
- tsp->s_axp = axp;
- } else {
- fprintf(stderr, "Invalid symbol type %c for %s\n", c, id);
- lkexit(1);
- }
- /*
- * Place pointer in header symbol list
- */
- if (headp == NULL) {
- fprintf(stderr, "No header defined\n");
- lkexit(1);
- }
- nglob = hp->h_nglob;
- s = hp->s_list;
- for (i=0; i < nglob ;++i) {
- if (s[i] == NULL) {
- s[i] = tsp;
- return(tsp);
- }
- }
- fprintf(stderr, "Header symbol list overflow\n");
- lkexit(1);
-
- /* Never reached */
- return(0);
+ register int c ;
+ struct sym *tsp;
+ struct sym **s;
+ char id[NCPS];
+
+ getSid(id); // old: getid(id, -1);
+ tsp = lkpsym(id, 1);
+ c = getnb();get();get();
+ if (c == 'R') {
+ tsp->s_type |= S_REF;
+ if (eval()) {
+ fprintf(stderr, "Non zero S_REF\n");
+ lkerr++;
+ }
+ } else
+ if (c == 'D') {
+ i = eval();
+ if (tsp->s_type & S_DEF && tsp->s_addr != i) {
+ fprintf(stderr, "Multiple definition of %s\n", id);
+ lkerr++;
+ }
+ tsp->s_type |= S_DEF;
+ /*
+ * Set value and area extension link.
+ */
+ tsp->s_addr = i;
+ tsp->s_axp = axp;
+ } else {
+ fprintf(stderr, "Invalid symbol type %c for %s\n", c, id);
+ lkexit(1);
+ }
+ /*
+ * Place pointer in header symbol list
+ */
+ if (headp == NULL) {
+ fprintf(stderr, "No header defined\n");
+ lkexit(1);
+ }
+ nglob = hp->h_nglob;
+ s = hp->s_list;
+ for (i=0; i < nglob ;++i) {
+ if (s[i] == NULL) {
+ s[i] = tsp;
+ return(tsp);
+ }
+ }
+ fprintf(stderr, "Header symbol list overflow\n");
+ lkexit(1);
+
+ /* Never reached */
+ return(0);
}
-/*)Function sym * lkpsym(id,f)
- *
- * char * id symbol name string
- * int f f == 0, lookup only
- * f != 0, create if not found
- *
- * 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 if f != 0.
- * A pointer to this new sym structure is returned or a NULL
- * pointer is returned if f == 0.
- *
- * 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() lksym.c
- * VOID * new() lksym.c
- * int symeq() lksym.c
- *
- * side effects:
- * If the function new() fails to allocate space
- * for the new sym structure the linker terminates.
+/*)Function sym * lkpsym(id,f)
+ *
+ * char * id symbol name string
+ * int f f == 0, lookup only
+ * f != 0, create if not found
+ *
+ * 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 if f != 0.
+ * A pointer to this new sym structure is returned or a NULL
+ * pointer is returned if f == 0.
+ *
+ * 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() lksym.c
+ * VOID * new() lksym.c
+ * int symeq() lksym.c
+ *
+ * side effects:
+ * If the function new() fails to allocate space
+ * for the new sym structure the linker terminates.
*/
struct sym *
lkpsym(char *id, int f)
{
- register struct sym *sp;
- register int h;
-
- h = hash(id);
- sp = symhash[h];
- while (sp != NULL) {
- if (symeq(id, sp->s_id))
- return (sp);
- sp = sp->s_sp;
- }
- if (f == 0)
- return (NULL);
- sp = (struct sym *) new (sizeof(struct sym));
- sp->s_sp = symhash[h];
- symhash[h] = sp;
- sp->s_id = StoreString( id ); /* JLH */
- return (sp);
+ register struct sym *sp;
+ register int h;
+
+ h = hash(id);
+ sp = symhash[h];
+ while (sp != NULL) {
+ if (symeq(id, sp->s_id))
+ return (sp);
+ sp = sp->s_sp;
+ }
+ if (f == 0)
+ return (NULL);
+ sp = (struct sym *) new (sizeof(struct sym));
+ sp->s_sp = symhash[h];
+ symhash[h] = sp;
+ sp->s_id = StoreString( id ); /* JLH */
+ return (sp);
}
-/*)Function Addr_T symval(tsp)
+/*)Function Addr_T symval(tsp)
*
- * sym * tsp pointer to a symbol structure
+ * sym * tsp pointer to a symbol structure
*
- * The function symval() returns the value of the
- * relocated symbol by adding the variable definition
- * value to the areax base address.
+ * The function symval() returns the value of the
+ * relocated symbol by adding the variable definition
+ * value to the areax base address.
*
- * local variables:
- * Addr_T val relocated address value
+ * local variables:
+ * Addr_T val relocated address value
*
- * global variables:
- * none
+ * global variables:
+ * none
*
- * functions called:
- * none
+ * functions called:
+ * none
*
- * side effects:
- * none
+ * side effects:
+ * none
*/
Addr_T
symval(register struct sym *tsp)
{
- register Addr_T val;
+ register Addr_T val;
- val = tsp->s_addr;
- if (tsp->s_axp) {
- val += tsp->s_axp->a_addr;
- }
- return(val);
+ val = tsp->s_addr;
+ if (tsp->s_axp) {
+ val += tsp->s_axp->a_addr;
+ }
+ return(val);
}
-/*)Function VOID symdef(fp)
+/*)Function VOID symdef(fp)
*
- * FILE * fp file handle for output
+ * FILE * fp file handle for output
*
- * The function symdef() scans the hashed symbol table
- * searching for variables referenced but not defined.
- * Undefined variables are linked to the default
- * area "_CODE" and reported as referenced by the
- * appropriate module.
+ * The function symdef() scans the hashed symbol table
+ * searching for variables referenced but not defined.
+ * Undefined variables are linked to the default
+ * area "_CODE" and reported as referenced by the
+ * appropriate module.
*
- * local variables:
- * int i hash table index loop variable
- * sym * sp pointer to linked symbol structure
+ * local variables:
+ * int i hash table index loop variable
+ * sym * sp pointer to linked symbol structure
*
- * global variables:
- * area *areap The pointer to the first
- * area structure of a linked list
- * sym *symhash[NHASH] array of pointers to NHASH
- * linked symbol lists
+ * global variables:
+ * area *areap The pointer to the first
+ * area structure of a linked list
+ * sym *symhash[NHASH] array of pointers to NHASH
+ * linked symbol lists
*
- * functions called:
- * symmod() lksym.c
+ * functions called:
+ * symmod() lksym.c
*
- * side effects:
- * Undefined variables have their areas set to "_CODE".
+ * side effects:
+ * Undefined variables have their areas set to "_CODE".
*/
VOID
symdef(FILE *fp)
{
- register struct sym *sp;
- register int i;
-
- for (i=0; i<NHASH; ++i) {
- sp = symhash[i];
- while (sp) {
- if (sp->s_axp == NULL)
- sp->s_axp = areap->a_axp;
- if ((sp->s_type & S_DEF) == 0)
- symmod(fp, sp);
- sp = sp->s_sp;
- }
- }
+ register struct sym *sp;
+ register int i;
+
+ for (i=0; i<NHASH; ++i) {
+ sp = symhash[i];
+ while (sp) {
+ if (sp->s_axp == NULL)
+ sp->s_axp = areap->a_axp;
+ if ((sp->s_type & S_DEF) == 0)
+ symmod(fp, sp);
+ sp = sp->s_sp;
+ }
+ }
}
-/*)Function VOID symmod(fp,tsp)
- *
- * FILE * fp output file handle
- * sym * tsp pointer to a symbol structure
- *
- * The function symmod() scans the header structures
- * searching for a reference to the symbol structure
- * pointer to by tsp. The function then generates an error
- * message whichs names the module having referenced the
- * undefined variable.
- *
- * local variables:
- * int i loop counter
- * sym ** p pointer to a list of pointers
- * to symbol structures
- *
- * global variables:
- * head *headp The pointer to the first
- * head structure of a linked list
- * head *hp Pointer to the current
- * head structure
- * int lkerr error flag
- *
- * functions called:
- * int fprintf() c_library
- *
- * side effects:
- * Error output generated.
+/*)Function VOID symmod(fp,tsp)
+ *
+ * FILE * fp output file handle
+ * sym * tsp pointer to a symbol structure
+ *
+ * The function symmod() scans the header structures
+ * searching for a reference to the symbol structure
+ * pointer to by tsp. The function then generates an error
+ * message whichs names the module having referenced the
+ * undefined variable.
+ *
+ * local variables:
+ * int i loop counter
+ * sym ** p pointer to a list of pointers
+ * to symbol structures
+ *
+ * global variables:
+ * head *headp The pointer to the first
+ * head structure of a linked list
+ * head *hp Pointer to the current
+ * head structure
+ * int lkerr error flag
+ *
+ * functions called:
+ * int fprintf() c_library
+ *
+ * side effects:
+ * Error output generated.
*/
VOID
symmod(FILE *fp, struct sym *tsp)
{
- register int i;
- struct sym **p;
-
- if ((hp = headp) != NULL) {
- while(hp) {
- p = hp->s_list;
- for (i=0; i<hp->h_nglob; ++i) {
- if (p[i] == tsp) {
- fprintf(fp, "\n?ASlink-Warning-Undefined Global '%s' ", tsp->s_id);
- fprintf(fp, "referenced by module '%s'\n", hp->m_id);
- lkerr++;
- }
- }
- hp = hp->h_hp;
- }
- }
+ register int i;
+ struct sym **p;
+
+ if ((hp = headp) != NULL) {
+ while(hp) {
+ p = hp->s_list;
+ for (i=0; i<hp->h_nglob; ++i) {
+ if (p[i] == tsp) {
+ fprintf(fp, "\n?ASlink-Warning-Undefined Global '%s' ", tsp->s_id);
+ fprintf(fp, "referenced by module '%s'\n", hp->m_id);
+ lkerr++;
+ }
+ }
+ hp = hp->h_hp;
+ }
+ }
}
-/*)Function int symeq(p1, p2)
+/*)Function int symeq(p1, p2)
*
- * char * p1 name string
- * char * p2 name string
+ * 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.
+ * 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
+ * local variables:
+ * int h loop counter
*
- * global variables:
- * char ccase[] an array of characters which
- * perform the case translation function
+ * global variables:
+ * char ccase[] an array of characters which
+ * perform the case translation function
*
- * functions called:
- * none
+ * functions called:
+ * none
*
- * side effects:
- * none
+ * side effects:
+ * none
*
*/
int
symeq(register char *p1, register char *p2)
{
-#if CASE_SENSITIVE
- return (strncmp( p1, p2, NCPS ) == 0);
+#if CASE_SENSITIVE
+ return (strncmp( p1, p2, NCPS ) == 0);
#else
- return (as_strncmpi( p1, p2, NCPS ) == 0);
+ return (as_strncmpi( p1, p2, NCPS ) == 0);
#endif
}
-/*)Function int hash(p)
+/*)Function int hash(p)
*
- * char * p pointer to string to hash
+ * char * p pointer to string to hash
*
- * The function hash() computes a hash code using the sum
- * of all characters mod table size algorithm.
+ * 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
+ * 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
+ * global variables:
+ * char ccase[] an array of characters which
+ * perform the case translation function
*
- * functions called:
- * none
+ * functions called:
+ * none
*
- * side effects:
- * none
+ * side effects:
+ * none
*
*/
-
+
int
hash(register char *p)
{
- register int h, n;
+ register int h, n;
- h = 0;
- n = NCPS;
- while (*p && n--) {
+ h = 0;
+ n = NCPS;
+ while (*p && n--) {
-#if CASE_SENSITIVE
- h += *p++;
+#if CASE_SENSITIVE
+ h += *p++;
#else
- h += ccase[(unsigned char)(*p++)];
+ h += ccase[(unsigned char)(*p++)];
#endif
- }
- return (h&HMASK);
+ }
+ return (h&HMASK);
}
-/*)Function VOID * new(n)
+/*)Function VOID * new(n)
*
- * unsigned int n allocation size in bytes
+ * 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
- * linker is terminated.
+ * The function new() allocates n bytes of space and returns
+ * a pointer to this memory. If no space is available the
+ * linker is terminated.
*
- * local variables:
- * char * p a general pointer
- * char * q a general pointer
+ * local variables:
+ * char * p a general pointer
+ * char * q a general pointer
*
- * global variables:
- * none
+ * global variables:
+ * none
*
- * functions called:
- * int fprintf() c_library
- * VOID * malloc() c_library
+ * functions called:
+ * int fprintf() c_library
+ * VOID * malloc() c_library
*
- * side effects:
- * Memory is allocated, if allocation fails
- * the linker is terminated.
+ * side effects:
+ * Memory is allocated, if allocation fails
+ * the linker is terminated.
*/
VOID *
new(unsigned int n)
{
- register char *p;
+ register char *p;
- if ((p = (char *) calloc(n, 1)) == NULL) {
- fprintf(stderr, "Out of space!\n");
- lkexit(1);
- }
- return (p);
+ if ((p = (char *) calloc(n, 1)) == NULL) {
+ fprintf(stderr, "Out of space!\n");
+ lkexit(1);
+ }
+ return (p);
}
projects / fw / sdcc / blobdiff