ref: 7a66e2a3991b2b7d203d1a8290951bbfd2db9511
dir: /cc1/decl.c/
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <sizes.h>
#include <cc.h>
#include "cc1.h"
#define ID_EXPECTED 1
#define ID_ACCEPTED 2
struct dcldata {
uint8_t op;
union {
unsigned short nelem;
Symbol *sym;
struct funpars *pars;
uint8_t qlf;
} u;
};
static struct dcldata *declarator0(struct dcldata *dp, int8_t flags);
static struct dcldata *
arydcl(struct dcldata *dp)
{
expect('[');
expect(']');
if (dp->op == 255)
error("too much declarators");
dp->u.nelem = 0;
dp->op = ARY;
return dp + 1;
}
static struct dcldata *
fundcl(struct dcldata *dp)
{
expect('(');
expect(')');;
if (dp->op == 255)
error("too much declarators");
dp->op = FTN;
dp->u.pars = NULL;
return dp + 1;
}
static Symbol *
newiden(void)
{
Symbol *sym;
extern uint8_t curctx;
if (yylval.sym && yylval.sym->ctx == curctx)
error("redeclaration of '%s'", yytext);
sym = install(yytext, NS_IDEN);
next();
return sym;
}
static struct dcldata *
directdcl(struct dcldata *dp, int8_t flags)
{
register Symbol *sym;
if (accept('(')) {
dp = declarator0(dp, flags);
expect(')');
} else if (flags) {
if (yytoken != IDEN) {
if (flags & ID_EXPECTED)
goto expected;
sym = install("", NS_IDEN);
} else {
sym = newiden();
}
dp->op = IDEN;
dp->u.sym = sym;
++dp;
}
for (;;) {
switch (yytoken) {
case '(': dp = fundcl(dp); break;
case '[': dp = arydcl(dp); break;
default: return dp;
}
}
expected:
error("expected '(' or identifier before of '%s'" , yytext);
}
static struct dcldata*
declarator0(struct dcldata *dp, int8_t flags)
{
uint8_t buffer[NR_DECLARATORS];
register uint8_t *bp, n, qlf;
bp = buffer;
for (n = 0; accept('*'); ++n) {
if (n == NR_DECLARATORS)
goto too_much_declarators;
qlf = 0;
if (yytoken == TQUALIFIER) {
qlf |= yylval.token;
next();
}
*bp++ = qlf;
}
dp = directdcl(dp, flags);
bp = buffer;
while (n--) {
if (dp->op == 255)
goto too_much_declarators;
dp->op = PTR;
dp->u.qlf = *bp++;
++dp;
}
return dp;
too_much_declarators:
error("too much declarators");
}
static Symbol *
declarator(Type *tp, int8_t flags)
{
struct dcldata data[NR_DECLARATORS+1];
register struct dcldata *bp;
Symbol *sym = NULL;
static Symbol dummy;
memset(data, 0, sizeof(data));
data[NR_DECLARATORS].op = 255;
for (bp = declarator0(data, flags); bp >= data; --bp) {
switch (bp->op) {
case PTR:
tp = qualifier(mktype(tp, PTR, 0), bp->u.qlf);
break;
case ARY:
tp = mktype(tp, ARY, bp->u.nelem);
break;
case FTN:
tp = mktype(tp, FTN, 0);
break;
case IDEN:
sym = bp->u.sym;
break;
}
}
if (!tp->defined)
error("declared variable '%s' of incomplete type", sym->name);
if (!sym)
sym = &dummy;
sym->type = tp;
return sym;
}
static Type *structdcl(void), *enumdcl(void);
static Type *
specifier(int8_t *sclass)
{
Type *tp = NULL;
int8_t qlf, sign, type, cls, size, t;
qlf = sign = type = cls = size = 0;
for (;;) {
register int8_t *p;
Type *(*dcl)(void) = NULL;
switch (yytoken) {
case SCLASS: p = &cls; break;
case TQUALIFIER:
if ((qlf |= yylval.token) & RESTRICT)
goto invalid_type;
next();
continue;
case TYPE:
switch (yylval.token) {
case ENUM:
dcl = enumdcl; p = &type; break;
case STRUCT: case UNION:
dcl = structdcl; p = &type; break;
case TYPENAME:
tp = yylval.sym->type;
case VOID: case BOOL: case CHAR:
case INT: case FLOAT: case DOUBLE:
p = &type; break;
case SIGNED: case UNSIGNED:
p = &sign; break;
case LONG:
if (size == LONG) {
size = LONG+LONG;
break;
}
case SHORT:
p = &size; break;
}
break;
default:
goto check_types;
}
if (*p)
goto invalid_type;
*p = yylval.token;
if (dcl)
tp = aggregate(dcl);
else
next();
}
check_types:
if (!type) {
if (!sign && !size) {
warn(options.implicit,
"type defaults to 'int' in declaration");
}
type = INT;
}
if (sign && type != INT && type != CHAR ||
size == SHORT && type != INT ||
size == LONG && type != INT && type != DOUBLE ||
size == LONG+LONG && type != INT) {
goto invalid_type;
}
if (sclass)
*sclass = cls;
if (!tp)
tp = ctype(type, sign, size);
return (qlf) ? qualifier(tp, qlf) : tp;
invalid_type:
error("invalid type specification");
}
/* TODO: check correctness of the initializator */
/* TODO: emit initializer */
static struct node *
initializer(Symbol *sym)
{
register Type *tp = sym->type;
if (!sym->s.isdefined)
error("'%s' initialized and declared extern", sym->name);
if (accept('{')) {
initializer(sym);
expect('}');
} else {
do {
expr();
} while (accept(','));
}
}
/* TODO: bitfields */
static void
newfield(Type *tp, Symbol *sym)
{
register Field *p, *q;
register char *s, *t;
s = sym->name;
for (q = p = tp->u.fields; p; q = p, p = p->next) {
t = p->name;
if (*s == *t && !strcmp(s, t))
error("duplicated fields '%s' and '%s'", s, t);
if (sym->u.i == p->id)
error("duplicated enumeration fields '%s' and '%s'",
s, t);
}
p = xmalloc(sizeof(*p));
p->name = xstrdup(s);
p->next = NULL;
p->id = sym->id;
p->type = sym->type;
if (!q)
tp->u.fields = p;
else
q->next = p;
return;
}
static void
fielddcl(Type *base)
{
Type *tp;
Symbol *sym;
switch (yytoken) {
case SCLASS:
error("storage class '%s' in struct/union field", yytext);
case IDEN: case TYPE: case TQUALIFIER:
tp = specifier(NULL);
case ';':
break;
default:
error("declaration expected");
}
if (yytoken != ';') {
do {
sym = declarator(tp, ID_EXPECTED);
newfield(base, sym);
} while (accept(','));
}
expect(';');
return;
}
static Type *
newtag(uint8_t tag)
{
register Symbol *sym;
register Type *tp;
if (yytoken == IDEN) {
if ((sym = lookup(yytext, NS_TAG)) == NULL)
sym = install(yytext, NS_TAG);
next();
} else {
sym = install("", NS_TAG);
}
if (!(tp = sym->type))
tp = sym->type = mktype(NULL, tag, 0);
if (tp->op != tag)
error("'%s' defined as wrong kind of tag", yytext);
return tp;
}
static Type *
structdcl(void)
{
Type *tp;
uint8_t tag;
tag = yylval.token;
next();
tp = newtag(tag);
if (accept('{')) {
if (tp->defined)
error("redefinition of struct/union '%s'", yytext);
tp->defined = 1;
while (!accept('}'))
fielddcl(tp);
}
return tp;
}
static Type *
enumdcl(void)
{
register Type *tp;
Symbol *sym;
int val = 0;
next();
tp = newtag(ENUM);
if (yytoken == ';')
return tp;
expect('{');
if (tp->defined)
error("redefinition of enumeration '%s'", yytext);
tp->defined = 1;
while (yytoken != '}') {
if (yytoken != IDEN)
error("identifier expected");
sym = newiden();
sym->type = inttype;
if (accept('='))
initializer(sym);
sym->u.i = val++;
newfield(tp, sym);
if (!accept(','))
break;
}
expect('}');
return tp;
}
void
decl(void)
{
Type *tp;
Symbol *sym;
int8_t sclass, isfun;
tp = specifier(&sclass);
if (accept(';'))
return;
do {
sym = declarator(tp, ID_EXPECTED);
sym->s.isdefined = 1;
isfun = BTYPE(sym->type) != FTN;
switch (sclass) {
case TYPEDEF:
sym->token = TYPE;
sym->u.token = TYPENAME;
continue;
case STATIC:
sym->s.isstatic = 1;
break;
case EXTERN:
sym->s.isdefined = 0;
break;
case REGISTER:
sym->s.isregister = 1;
if (isfun)
goto bad_function;
break;
case AUTO:
if (isfun)
goto bad_function;
/* passtrough */
default:
sym->s.isauto = 1;
break;
}
if (accept('='))
initializer(sym);
emitdcl(sym);
} while (accept(','));
expect(';');
return;
bad_function:
error("invalid storage class for function '%s'", sym->name);
}
Type *
typename(void)
{
int8_t sclass;
Type *tp;
Symbol *sym;
tp = specifier(&sclass);
if (sclass)
error("class storage in type name");
sym = declarator(tp, 0);
return sym->type;
}
void
extdecl(void)
{
Type *base, *tp;
int8_t sclass;
Symbol *sym;
extern Symbol *curfun;
switch (yytoken) {
case IDEN: case TYPE: case SCLASS: case TQUALIFIER:
base = specifier(&sclass);
if (accept(';'))
return;
do {
sym = declarator(base, ID_EXPECTED);
tp = sym->type;
sym->s.isstatic = 1;
sym->s.isglobal= 1;
sym->s.isdefined = 1;
switch (sclass) {
case REGISTER: case AUTO:
error("incorrect storage class for file-scope declaration");
case STATIC:
sym->s.isglobal = 0;
break;
case EXTERN:
sym->s.isdefined = 0;
break;
case TYPEDEF:
sym->token = TYPE;
sym->u.token = TYPENAME;
continue;
}
if (BTYPE(tp) != FTN) {
if (accept('='))
initializer(sym);
emitdcl(sym);
} else if (yytoken == '{') {
curfun = sym;
emitfun(sym);
context(NULL, NULL, NULL);
emitefun();
return;
}
} while (accept(','));
/* PASSTHROUGH */
case ';':
expect(';');
return;
case '@':
next();
emitprint(expr());
expect(';');
return;
default:
error("declaration expected");
}
}