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Prevent purging referenced symbols

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This is an immediate fix for #492, although #342 is needed to implement the
desired functionality.
This commit is contained in:
ISSOtm
2020-03-21 15:42:52 +01:00
parent eb445271df
commit 03967bd623
5 changed files with 42 additions and 0 deletions
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11
src/asm/symbol.c
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@@ -127,6 +127,7 @@ static struct sSymbol *createsymbol(char const *s)
(*ppsym)->isConstant = false;
(*ppsym)->isExported = false;
(*ppsym)->isBuiltin = false;
(*ppsym)->isReferenced = false;
(*ppsym)->pScope = NULL;
(*ppsym)->pNext = NULL;
(*ppsym)->pSection = NULL;
@@ -211,6 +212,11 @@ struct sSymbol *sym_FindSymbol(char const *tzName)
return findsymbol(tzName, pscope);
}
static inline bool isReferenced(struct sSymbol const *sym)
{
return sym->isReferenced;
}
/*
* Purge a symbol
*/
@@ -230,6 +236,9 @@ void sym_Purge(char const *tzName)
yyerror("'%s' not defined", tzName);
} else if ((*ppSym)->isBuiltin) {
yyerror("Built-in symbol '%s' cannot be purged", tzName);
} else if (isReferenced(*ppSym)) {
yyerror("Symbol \"%s\" is referenced and thus cannot be purged",
tzName);
} else {
struct sSymbol *pSym;
@@ -468,6 +477,7 @@ struct sSymbol *sym_AddReloc(char const *tzSym)
else if (sym_IsDefined(nsym))
yyerror("'%s' already defined in %s(%d)", tzSym,
nsym->tzFileName, nsym->nFileLine);
/* If the symbol already exists as a ref, just "take over" it */
nsym->nValue = nPC;
nsym->type = SYM_LABEL;
@@ -544,6 +554,7 @@ void sym_Ref(char const *tzSym)
nsym = createsymbol(tzSym);
nsym->type = SYM_REF;
}
nsym->isReferenced = true;
}
/*