ref: 81c72588ffc4ab7139aca57d2a0121c263f99af2
dir: /decl.c/
#include <assert.h>
#include <stddef.h>
#include <string.h>
#include "sizes.h"
#include "cc.h"
#include "tokens.h"
#include "syntax.h"
#include "symbol.h"
char parser_out_home;
/*
* Number of nested declarations:
* Number of nested struct declarations
* +1 for the function declaration
* +1 for the field declaration
*/
static struct symbol *symstack[NR_STRUCT_LEVEL + 1 + 1], **symstackp = symstack;
static struct symbol *cursym;
static unsigned char nr_tags = NS_TAG;
static unsigned char nested_tags;
static void declarator(struct ctype *tp, unsigned char ns);
static void
directdcl(register struct ctype *tp, unsigned char ns)
{
if (accept('(')) {
declarator(tp, ns);
expect(')');
} else if (yytoken == IDEN) {
/* we can't overflow due to the check in structdcl */
*symstackp++ = cursym = lookup(yytext, ns);
if (!cursym->ctype)
cursym->ctx = curctx;
else if (cursym->ctx == curctx)
error("redeclaration of '%s'", yytext);
next();
} else {
error("expected '(' or identifier before of '%s'", yytext);
}
for (;;) {
if (accept('(')) {
pushtype(FTN);
if (accept(')'))
; /* TODO: k&r function */
else
/* TODO: prototyped function */;
} else if (accept('[')) {
unsigned len;
if (accept(']')) {
len = 0;
} else {
expect(CONSTANT);
len = yyval->i;
expect(']');
}
pushtype(len);
pushtype(ARY);
} else {
return;
}
}
}
static void
aggregate(register struct ctype *tp)
{
struct symbol *sym = NULL;
if (yytoken == IDEN) {
sym = lookup(yytext, NS_TAG);
sym->ctype = tp;
next();
}
if (nr_tags == NS_TAG + NR_MAXSTRUCTS)
error("too much structs/unions/enum defined");
tp->ns = ++nr_tags;
tp->forward = 1;
tp->sym = sym;
}
static bool
specifier(register struct ctype *, struct storage *, struct qualifier *);
static void
fielddcl(unsigned char ns)
{
struct ctype base;
struct storage store;
struct qualifier qlf;
register struct ctype *tp;
initctype(&base);
initstore(&store);
initqlf(&qlf);
specifier(&base, &store, &qlf);
if (store.defined)
error("storage specifier in a struct/union field declaration");
do {
declarator(&base, ns);
tp = decl_type(&base);
if (accept(':')) {
expect(CONSTANT);
switch (tp->type) {
case INT: case BOOL:
tp = ctype(NULL, BITFLD);
tp->len = yyval->i;
break;
default:
error("bit-field '%s' has invalid type",
cursym->name);
}
}
cursym->ctype = tp;
cursym->qlf = qlf;
} while (accept(','));
expect(';');
}
static void
structdcl(register struct ctype *tp)
{
aggregate(tp);
if (nested_tags == NR_STRUCT_LEVEL)
error("too much nested structs/unions");
++nested_tags;
if (!accept('{'))
return;
if (!tp->forward)
error("struct/union already defined");
do
fielddcl(tp->ns);
while (!accept('}'));
--nested_tags;
tp->forward = 0;
}
static void
enumdcl(struct ctype *base)
{
short val = 0;
aggregate(base);
if (!accept('{'))
return;
do {
register struct symbol *sym;
register struct ctype *tp = ctype(NULL, INT);
if (yytoken != IDEN)
break;
sym = lookup(yytext, NS_IDEN);
sym->ctype = tp;
next();
if (accept('=')) {
expect(CONSTANT);
val = yyval->i;
}
sym->i = val++;
} while (accept(','));
expect('}');
}
bool
specifier(register struct ctype *tp,
struct storage *store, struct qualifier *qlf)
{
for (;; next()) {
switch (yytoken) {
case CONST: case VOLATILE:
qlf = qualifier(qlf, yytoken);
break;
case TYPEDEF: case EXTERN: case STATIC:
case AUTO: case REGISTER:
store = storage(store, yytoken);
break;
case UNSIGNED: case SIGNED:
case COMPLEX: case IMAGINARY:
case FLOAT: case DOUBLE: case BOOL:
case VOID: case CHAR: case SHORT:
case INT: case LONG:
tp = ctype(tp, yytoken);
break;
case ENUM:
tp = ctype(tp, yytoken);
next();
enumdcl(tp);
return true;
case STRUCT: case UNION:
tp = ctype(tp, yytoken);
next();
structdcl(tp);
return true;
case IDEN:
if (!tp->defined) {
register struct symbol *sym;
sym = lookup(yytext, NS_IDEN);
if (sym->ctype && sym->store.c_typedef) {
tp = ctype(tp, TYPEDEF);
tp->base = sym->ctype;
break;
}
}
/* it is not a type name */
default:
goto check_type;
}
}
check_type:
if (!tp->defined) {
if (!store->defined &&
!qlf->defined &&
curctx != CTX_OUTER &&
nested_tags == 0) {
return false;
}
warn(options.implicit,
"type defaults to 'int' in declaration");
}
if (nested_tags > 0 && (qlf->defined || store->defined))
error("type qualifer or store specifier in field declaration");
if (!tp->c_signed && !tp->c_unsigned) {
switch (tp->type) {
case CHAR:
if (!options.charsign) {
case BOOL: tp->c_unsigned = 1;
break;
}
case INT: case SHORT: case LONG: case LLONG:
tp->c_signed = 1;
}
}
return true;
}
static void
declarator(struct ctype *tp, unsigned char ns)
{
unsigned char qlf[NR_DECLARATORS];
register unsigned char *bp, *lim;
lim = &qlf[NR_DECLARATORS];
for (bp = qlf; yytoken == '*' && bp != lim; ) {
next();
*bp++ = PTR;
while (bp != lim) {
switch (yytoken) {
case CONST: case VOLATILE: case RESTRICT:
*bp++ = yytoken;
next();
break;
default:
goto continue_outer;
}
}
continue_outer: ;
}
if (bp == lim)
error("Too much type declarators");
directdcl(tp, ns);
for (lim = bp, bp = qlf; bp < lim; ++bp)
pushtype(*bp);
}
static struct node *
initializer(register struct ctype *tp)
{
if (!accept('='))
return NULL;
next();
if (accept('{')) {
struct compound c;
c.tree = NULL;
addstmt(&c, initializer(tp));
while (accept(',')) {
if (accept('}'))
return c.tree;
addstmt(&c, initializer(tp));
}
expect('}');
return c.tree;
} else {
return expr();
}
}
static struct node *
listdcl(struct ctype *base, struct storage *store, struct qualifier *qlf)
{
struct compound c;
char fun;
c.tree = NULL;
do {
struct node *np, *aux;
register struct ctype *tp;
declarator(base, NS_IDEN);
cursym->store = *store;
cursym->qlf = *qlf;
tp = cursym->ctype = decl_type(base);
if ((tp->type == STRUCT || tp->type == UNION) && tp->forward)
error("declaration of variable with incomplete type");
np = nodesym(cursym);
fun = tp->type == FTN && yytoken == '{';
aux = fun ? function(cursym) : initializer(tp);
addstmt(&c, node(ODEF, np, aux));
cursym = *--symstackp;
} while (!fun && accept(','));
if (!fun)
expect(';');
return c.tree;
}
struct node *
decl(void)
{
struct ctype base;
struct storage store;
struct qualifier qlf;
struct node *np;
repeat: initctype(&base);
initstore(&store);
initqlf(&qlf);
if (!specifier(&base, &store, &qlf))
return NULL;
if (accept(';')) {
register unsigned char type = base.type;
switch (type) {
case STRUCT: case UNION:
if (!base.sym) {
warn(options.useless,
"unnamed struct/union that defines no instances");
}
case ENUM:
if (store.defined) {
warn(options.useless,
"useless storage class specifier in empty declaration");
}
if (qlf.defined) {
warn(options.useless,
"useless type qualifier in empty declaration");
}
break;
default:
warn(options.useless,
"useless type name in empty declaration");
}
if (yytoken == EOFTOK)
return NULL;
goto repeat;
}
np = listdcl(&base, &store, &qlf);
return np;
}
void
type_name()
{
}