ref: 7993d3455d9eef8173fe9d9fb24513989d72ce20
dir: /src/asm/symbol.c/
/*
* Symboltable and macroargs stuff
*/
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include "asm/asm.h"
#include "asm/symbol.h"
#include "asm/main.h"
#include "asm/mymath.h"
#include "asm/output.h"
struct sSymbol *tHashedSymbols[HASHSIZE];
struct sSymbol *pScope = NULL;
struct sSymbol *pPCSymbol = NULL;
struct sSymbol *p_NARGSymbol = NULL;
char *currentmacroargs[MAXMACROARGS + 1];
char *newmacroargs[MAXMACROARGS + 1];
char SavedTIME[256];
char SavedDATE[256];
bool exportall;
SLONG
Callback_NARG(struct sSymbol * sym)
{
ULONG i = 0;
while (currentmacroargs[i] && i < MAXMACROARGS)
i += 1;
return (i);
}
/*
* Get the nValue field of a symbol
*/
SLONG
getvaluefield(struct sSymbol * sym)
{
if (sym->Callback) {
return (sym->Callback(sym));
} else
return (sym->nValue);
}
/*
* Calculate the hash value for a string
*/
ULONG
calchash(char *s)
{
ULONG hash = 5381;
while (*s != 0)
hash = (hash * 33) ^ (*s++);
return (hash % HASHSIZE);
}
/*
* Create a new symbol by name
*/
struct sSymbol *
createsymbol(char *s)
{
struct sSymbol **ppsym;
ULONG hash;
hash = calchash(s);
ppsym = &(tHashedSymbols[hash]);
while ((*ppsym) != NULL)
ppsym = &((*ppsym)->pNext);
if (((*ppsym) = malloc(sizeof(struct sSymbol))) != NULL) {
strcpy((*ppsym)->tzName, s);
(*ppsym)->nValue = 0;
(*ppsym)->nType = 0;
(*ppsym)->pScope = NULL;
(*ppsym)->pNext = NULL;
(*ppsym)->pMacro = NULL;
(*ppsym)->pSection = NULL;
(*ppsym)->Callback = NULL;
return (*ppsym);
} else {
fatalerror("No memory for symbol");
return (NULL);
}
}
/*
* Find a symbol by name and scope
*/
struct sSymbol *
findsymbol(char *s, struct sSymbol * scope)
{
struct sSymbol **ppsym;
SLONG hash;
hash = calchash(s);
ppsym = &(tHashedSymbols[hash]);
while ((*ppsym) != NULL) {
if ((strcmp(s, (*ppsym)->tzName) == 0)
&& ((*ppsym)->pScope == scope)) {
return (*ppsym);
} else
ppsym = &((*ppsym)->pNext);
}
return (NULL);
}
/*
* Find the pointer to a symbol by name and scope
*/
struct sSymbol **
findpsymbol(char *s, struct sSymbol * scope)
{
struct sSymbol **ppsym;
SLONG hash;
hash = calchash(s);
ppsym = &(tHashedSymbols[hash]);
while ((*ppsym) != NULL) {
if ((strcmp(s, (*ppsym)->tzName) == 0)
&& ((*ppsym)->pScope == scope)) {
return (ppsym);
} else
ppsym = &((*ppsym)->pNext);
}
return (NULL);
}
/*
* Find a symbol by name and scope
*/
struct sSymbol *
sym_FindSymbol(char *tzName)
{
struct sSymbol *pscope;
if (*tzName == '.')
pscope = pScope;
else
pscope = NULL;
return (findsymbol(tzName, pscope));
}
/*
* Purge a symbol
*/
void
sym_Purge(char *tzName)
{
struct sSymbol **ppSym;
struct sSymbol *pscope;
if (*tzName == '.')
pscope = pScope;
else
pscope = NULL;
ppSym = findpsymbol(tzName, pscope);
if (ppSym) {
struct sSymbol *pSym;
pSym = *ppSym;
*ppSym = pSym->pNext;
if (pSym->pMacro)
free(pSym->pMacro);
free(pSym);
} else {
yyerror("'%s' not defined", tzName);
}
}
/*
* Determine if a symbol has been defined
*/
ULONG
sym_isConstDefined(char *tzName)
{
struct sSymbol *psym, *pscope;
if (*tzName == '.')
pscope = pScope;
else
pscope = NULL;
psym = findsymbol(tzName, pscope);
if (psym && (psym->nType & SYMF_DEFINED)) {
if (psym->
nType & (SYMF_EQU | SYMF_SET | SYMF_MACRO | SYMF_STRING)) {
return (1);
} else {
fatalerror("'%s' is not allowed as argument to the "
"DEF function", tzName);
}
}
return (0);
}
ULONG
sym_isDefined(char *tzName)
{
struct sSymbol *psym, *pscope;
if (*tzName == '.')
pscope = pScope;
else
pscope = NULL;
psym = findsymbol(tzName, pscope);
if (psym && (psym->nType & SYMF_DEFINED))
return (1);
else
return (0);
}
/*
* Determine if the symbol is a constant
*/
ULONG
sym_isConstant(char *s)
{
struct sSymbol *psym, *pscope;
if (*s == '.')
pscope = pScope;
else
pscope = NULL;
if ((psym = findsymbol(s, pscope)) != NULL) {
if (psym->nType & SYMF_CONST)
return (1);
}
return (0);
}
/*
* Get a string equate's value
*/
char *
sym_GetStringValue(char *tzSym)
{
struct sSymbol *pSym;
if ((pSym = sym_FindSymbol(tzSym)) != NULL)
return (pSym->pMacro);
else {
yyerror("Stringsymbol '%s' not defined", tzSym);
}
return (NULL);
}
/*
* Return a constant symbols value
*/
ULONG
sym_GetConstantValue(char *s)
{
struct sSymbol *psym, *pscope;
if (*s == '.')
pscope = pScope;
else
pscope = NULL;
if ((psym = findsymbol(s, pscope)) != NULL) {
if (psym->nType & SYMF_CONST)
return (getvaluefield(psym));
else {
fatalerror("Expression must have a constant value");
}
} else {
yyerror("'%s' not defined", s);
}
return (0);
}
/*
* Return a symbols value... "estimated" if not defined yet
*/
ULONG
sym_GetValue(char *s)
{
struct sSymbol *psym, *pscope;
if (*s == '.')
pscope = pScope;
else
pscope = NULL;
if ((psym = findsymbol(s, pscope)) != NULL) {
if (psym->nType & SYMF_DEFINED) {
if (psym->nType & (SYMF_MACRO | SYMF_STRING)) {
yyerror("'%s' is a macro or string symbol", s);
}
return (getvaluefield(psym));
} else {
if (nPass == 2) {
/* Assume undefined symbols are imported from somewhere else */
psym->nType |= SYMF_IMPORT;
}
/* 0x80 seems like a good default value... */
return (0x80);
}
} else {
if (nPass == 1) {
createsymbol(s);
return (0x80);
} else {
yyerror("'%s' not defined", s);
}
}
return (0);
}
/*
* Return a defined symbols value... aborts if not defined yet
*/
ULONG
sym_GetDefinedValue(char *s)
{
struct sSymbol *psym, *pscope;
if (*s == '.')
pscope = pScope;
else
pscope = NULL;
if ((psym = findsymbol(s, pscope)) != NULL) {
if ((psym->nType & SYMF_DEFINED)) {
if (psym->nType & (SYMF_MACRO | SYMF_STRING)) {
yyerror("'%s' is a macro or string symbol", s);
}
return (getvaluefield(psym));
} else {
yyerror("'%s' not defined", s);
}
} else {
yyerror("'%s' not defined", s);
}
return (0);
}
/*
* Macro argument stuff
*/
void
sym_ShiftCurrentMacroArgs(void)
{
SLONG i;
free(currentmacroargs[0]);
for (i = 0; i < MAXMACROARGS - 1; i += 1) {
currentmacroargs[i] = currentmacroargs[i + 1];
}
currentmacroargs[MAXMACROARGS - 1] = NULL;
}
char *
sym_FindMacroArg(SLONG i)
{
if (i == -1)
i = MAXMACROARGS + 1;
assert(i-1 >= 0 &&
i-1 < sizeof currentmacroargs / sizeof *currentmacroargs);
return (currentmacroargs[i - 1]);
}
void
sym_UseNewMacroArgs(void)
{
SLONG i;
for (i = 0; i <= MAXMACROARGS; i += 1) {
currentmacroargs[i] = newmacroargs[i];
newmacroargs[i] = NULL;
}
}
void
sym_SaveCurrentMacroArgs(char *save[])
{
SLONG i;
for (i = 0; i <= MAXMACROARGS; i += 1)
save[i] = currentmacroargs[i];
}
void
sym_RestoreCurrentMacroArgs(char *save[])
{
SLONG i;
for (i = 0; i <= MAXMACROARGS; i += 1)
currentmacroargs[i] = save[i];
}
void
sym_FreeCurrentMacroArgs(void)
{
SLONG i;
for (i = 0; i <= MAXMACROARGS; i += 1) {
free(currentmacroargs[i]);
currentmacroargs[i] = NULL;
}
}
void
sym_AddNewMacroArg(char *s)
{
SLONG i = 0;
while (i < MAXMACROARGS && newmacroargs[i] != NULL)
i += 1;
if (i < MAXMACROARGS) {
if (s)
newmacroargs[i] = strdup(s);
else
newmacroargs[i] = NULL;
} else
yyerror("A maximum of %d arguments allowed", MAXMACROARGS);
}
void
sym_SetMacroArgID(ULONG nMacroCount)
{
char s[256];
sprintf(s, "_%ld", nMacroCount);
newmacroargs[MAXMACROARGS] = strdup(s);
}
void
sym_UseCurrentMacroArgs(void)
{
SLONG i;
for (i = 1; i <= MAXMACROARGS; i += 1)
sym_AddNewMacroArg(sym_FindMacroArg(i));
}
/*
* Find a macro by name
*/
struct sSymbol *
sym_FindMacro(char *s)
{
return (findsymbol(s, NULL));
}
/*
* Add an equated symbol
*/
void
sym_AddEqu(char *tzSym, SLONG value)
{
if ((nPass == 1)
|| ((nPass == 2) && (sym_isDefined(tzSym) == 0))) {
/* only add equated symbols in pass 1 */
struct sSymbol *nsym;
if ((nsym = findsymbol(tzSym, NULL)) != NULL) {
if (nsym->nType & SYMF_DEFINED) {
yyerror("'%s' already defined", tzSym);
}
} else
nsym = createsymbol(tzSym);
if (nsym) {
nsym->nValue = value;
nsym->nType |= SYMF_EQU | SYMF_DEFINED | SYMF_CONST;
nsym->pScope = NULL;
}
}
}
/*
* Add a string equated symbol
*/
void
sym_AddString(char *tzSym, char *tzValue)
{
struct sSymbol *nsym;
if ((nsym = findsymbol(tzSym, NULL)) != NULL) {
if (nsym->nType & SYMF_DEFINED) {
yyerror("'%s' already defined", tzSym);
}
} else
nsym = createsymbol(tzSym);
if (nsym) {
if ((nsym->pMacro = malloc(strlen(tzValue) + 1)) != NULL)
strcpy(nsym->pMacro, tzValue);
else
fatalerror("No memory for stringequate");
nsym->nType |= SYMF_STRING | SYMF_DEFINED;
nsym->ulMacroSize = strlen(tzValue);
nsym->pScope = NULL;
}
}
/*
* check if symbol is a string equated symbol
*/
ULONG
sym_isString(char *tzSym)
{
struct sSymbol *pSym;
if ((pSym = findsymbol(tzSym, NULL)) != NULL) {
if (pSym->nType & SYMF_STRING)
return (1);
}
return (0);
}
/*
* Alter a SET symbols value
*/
void
sym_AddSet(char *tzSym, SLONG value)
{
struct sSymbol *nsym;
if ((nsym = findsymbol(tzSym, NULL)) != NULL) {
} else
nsym = createsymbol(tzSym);
if (nsym) {
nsym->nValue = value;
nsym->nType |= SYMF_SET | SYMF_DEFINED | SYMF_CONST;
nsym->pScope = NULL;
}
}
/*
* Add a local (.name) relocatable symbol
*/
void
sym_AddLocalReloc(char *tzSym)
{
if ((nPass == 1)
|| ((nPass == 2) && (sym_isDefined(tzSym) == 0))) {
/* only add local reloc symbols in pass 1 */
struct sSymbol *nsym;
if (pScope) {
if ((nsym = findsymbol(tzSym, pScope)) != NULL) {
if (nsym->nType & SYMF_DEFINED) {
yyerror("'%s' already defined", tzSym);
}
} else
nsym = createsymbol(tzSym);
if (nsym) {
nsym->nValue = nPC;
nsym->nType |=
SYMF_RELOC | SYMF_LOCAL | SYMF_DEFINED;
if (exportall) {
nsym->nType |= SYMF_EXPORT;
}
nsym->pScope = pScope;
nsym->pSection = pCurrentSection;
}
} else
fatalerror("Local label in main scope");
}
}
/*
* Add a relocatable symbol
*/
void
sym_AddReloc(char *tzSym)
{
if ((nPass == 1)
|| ((nPass == 2) && (sym_isDefined(tzSym) == 0))) {
/* only add reloc symbols in pass 1 */
struct sSymbol *nsym;
if ((nsym = findsymbol(tzSym, NULL)) != NULL) {
if (nsym->nType & SYMF_DEFINED) {
yyerror("'%s' already defined", tzSym);
}
} else
nsym = createsymbol(tzSym);
if (nsym) {
nsym->nValue = nPC;
nsym->nType |= SYMF_RELOC | SYMF_DEFINED;
if (exportall) {
nsym->nType |= SYMF_EXPORT;
}
nsym->pScope = NULL;
nsym->pSection = pCurrentSection;
}
}
pScope = findsymbol(tzSym, NULL);
}
/*
* Export a symbol
*/
void
sym_Export(char *tzSym)
{
if (nPass == 1) {
/* only export symbols in pass 1 */
struct sSymbol *nsym;
if ((nsym = findsymbol(tzSym, 0)) == NULL)
nsym = createsymbol(tzSym);
if (nsym)
nsym->nType |= SYMF_EXPORT;
} else {
struct sSymbol *nsym;
if ((nsym = findsymbol(tzSym, 0)) != NULL) {
if (nsym->nType & SYMF_DEFINED)
return;
}
yyerror("'%s' not defined", tzSym);
}
}
/*
* Import a symbol
*/
void
sym_Import(char *tzSym)
{
if (nPass == 1) {
/* only import symbols in pass 1 */
struct sSymbol *nsym;
if (findsymbol(tzSym, NULL)) {
yyerror("'%s' already defined", tzSym);
}
if ((nsym = createsymbol(tzSym)) != NULL)
nsym->nType |= SYMF_IMPORT;
}
}
/*
* Globalize a symbol (export if defined, import if not)
*/
void
sym_Global(char *tzSym)
{
if (nPass == 2) {
/* only globalize symbols in pass 2 */
struct sSymbol *nsym;
nsym = findsymbol(tzSym, 0);
if ((nsym == NULL) || ((nsym->nType & SYMF_DEFINED) == 0)) {
if (nsym == NULL)
nsym = createsymbol(tzSym);
if (nsym)
nsym->nType |= SYMF_IMPORT;
} else {
if (nsym)
nsym->nType |= SYMF_EXPORT;
}
}
}
/*
* Add a macro definition
*/
void
sym_AddMacro(char *tzSym)
{
if ((nPass == 1)
|| ((nPass == 2) && (sym_isDefined(tzSym) == 0))) {
/* only add macros in pass 1 */
struct sSymbol *nsym;
if ((nsym = findsymbol(tzSym, NULL)) != NULL) {
if (nsym->nType & SYMF_DEFINED) {
yyerror("'%s' already defined", tzSym);
}
} else
nsym = createsymbol(tzSym);
if (nsym) {
nsym->nValue = nPC;
nsym->nType |= SYMF_MACRO | SYMF_DEFINED;
nsym->pScope = NULL;
nsym->ulMacroSize = ulNewMacroSize;
nsym->pMacro = tzNewMacro;
}
}
}
/*
* Set whether to export all relocable symbols by default
*/
void sym_SetExportAll(BBOOL set) {
exportall = set;
}
/*
* Prepare for pass #1
*/
void
sym_PrepPass1(void)
{
sym_Init();
}
/*
* Prepare for pass #2
*/
void
sym_PrepPass2(void)
{
SLONG i;
for (i = 0; i < HASHSIZE; i += 1) {
struct sSymbol **ppSym = &(tHashedSymbols[i]);
while (*ppSym) {
if ((*ppSym)->
nType & (SYMF_SET | SYMF_STRING | SYMF_EQU)) {
struct sSymbol *pTemp;
pTemp = (*ppSym)->pNext;
free(*ppSym);
*ppSym = pTemp;
} else
ppSym = &((*ppSym)->pNext);
}
}
pScope = NULL;
pPCSymbol->nValue = 0;
sym_AddString("__TIME__", SavedTIME);
sym_AddString("__DATE__", SavedDATE);
sym_AddSet("_RS", 0);
sym_AddEqu("_NARG", 0);
p_NARGSymbol = findsymbol("_NARG", NULL);
p_NARGSymbol->Callback = Callback_NARG;
math_DefinePI();
}
/*
* Initialize the symboltable
*/
void
sym_Init(void)
{
SLONG i;
time_t tod;
for (i = 0; i < MAXMACROARGS; i += 1) {
currentmacroargs[i] = NULL;
newmacroargs[i] = NULL;
}
for (i = 0; i < HASHSIZE; i += 1)
tHashedSymbols[i] = NULL;
sym_AddReloc("@");
pPCSymbol = findsymbol("@", NULL);
sym_AddEqu("_NARG", 0);
p_NARGSymbol = findsymbol("_NARG", NULL);
p_NARGSymbol->Callback = Callback_NARG;
sym_AddSet("_RS", 0);
if (time(&tod) != -1) {
struct tm *tptr;
tptr = localtime(&tod);
strftime(SavedTIME, sizeof(SavedTIME), "%H:%M:%S", tptr);
strftime(SavedDATE, sizeof(SavedDATE), "%d %B %Y", tptr);
sym_AddString("__TIME__", SavedTIME);
sym_AddString("__DATE__", SavedDATE);
}
pScope = NULL;
math_DefinePI();
}