ref: f1dec280f4eb0f7b7fd8ee90fc70b1cecebd0c47
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
#define ID_FORBIDDEN 3
/* TODO: check identifiers in enum declaration */
struct dcldata {
uint8_t op;
union dclunion {
unsigned short nelem;
Symbol *sym;
Funpar *pars;
} u;
};
static struct dcldata *
queue(struct dcldata *dp, uint8_t op, union dclunion u)
{
if (dp->op == 255)
error("too much declarators");
dp->op = op;
dp->u = u;
return dp + 1;
}
static struct dcldata *
arydcl(struct dcldata *dp)
{
expect('[');
expect(']');
return queue(dp, ARY, (union dclunion) {.nelem = 0});
}
static Type *parameter(void);
static struct dcldata *
fundcl(struct dcldata *dp)
{
uint8_t n = 0;
Funpar *fp;
expect('(');
do {
Type *tp;
if ((tp = parameter()) == voidtype) {
if (n == 0)
break;
else
error("incorrect void parameter");
}
/* TODO: Use an array and allocate memory at the end */
fp = xmalloc(sizeof(*fp));
fp->type = tp;
fp->next = NULL;
if (!dp->u.pars) {
dp->u.pars = fp;
} else {
register Funpar *p, *q;
for (p = dp->u.pars; q = p->next; p = q)
/* nothing */;
p->next = fp;
}
++n;
} while (accept(','));
ret:
expect(')');;
return queue(dp, FTN, (union dclunion) {.pars = fp});
}
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 *declarator0(struct dcldata *dp);
static struct dcldata *
directdcl(struct dcldata *dp)
{
register Symbol *sym;
if (accept('(')) {
dp = declarator0(dp);
expect(')');
} else {
if (yytoken == IDEN || yytoken == TYPEIDEN)
sym = newiden();
else
sym = install("", NS_IDEN);
dp = queue(dp, IDEN, (union dclunion) {.sym = sym});
}
for (;;) {
switch (yytoken) {
case '(': dp = fundcl(dp); break;
case '[': dp = arydcl(dp); break;
default: return dp;
}
}
}
static struct dcldata*
declarator0(struct dcldata *dp)
{
register uint8_t n;
for (n = 0; accept('*'); ++n) {
while (accept(TQUALIFIER))
/* nothing */;
}
dp = directdcl(dp);
while (n--)
dp = queue(dp, PTR, (union dclunion) {});
return dp;
}
static Symbol *
declarator(Type *tp, int8_t flags)
{
struct dcldata data[NR_DECLARATORS+2];
register struct dcldata *bp;
Symbol *sym;
memset(data, 0, sizeof(data));
data[NR_DECLARATORS].op = 255;
for (bp = declarator0(data); bp >= data; --bp) {
switch (bp->op) {
case PTR:
tp = mktype(tp, PTR, NULL);
break;
case ARY:
tp = mktype(tp, ARY, &bp->u.nelem);
break;
case FTN:
tp = mktype(tp, FTN, bp->u.pars);
break;
case IDEN:
sym = bp->u.sym;
if (flags == ID_EXPECTED && *sym->name == '\0')
error("missed identifier in declaration");
if (flags == ID_FORBIDDEN && *sym->name != '\0')
error("unexpected identifier in type name");
break;
}
}
/* TODO: deal with external array declarations of [] */
if (!tp->defined && *sym->name)
error("declared variable '%s' of incomplete type", sym->name);
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 TYPEIDEN:
if (type)
goto return_type;
tp = yylval.sym->type;
p = &type;
break;
case TYPE:
switch (yylval.token) {
case ENUM:
dcl = enumdcl; p = &type; break;
case STRUCT: case UNION:
dcl = structdcl; p = &type; break;
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 return_type;
}
if (*p)
goto invalid_type;
*p = yylval.token;
if (dcl) {
if (size || sign)
goto invalid_type;
tp = aggregate(dcl);
} else {
next();
}
}
return_type:
if (sclass)
*sclass = cls;
if (!tp)
tp = ctype(type, sign, size);
return 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 TYPEIDEN: case TQUALIFIER:
tp = specifier(NULL);
case ';':
break;
default:
unexpected();
}
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;
switch (yytoken) {
case IDEN: case TYPEIDEN:
if ((sym = lookup(yytext, NS_TAG)) == NULL)
sym = install(yytext, NS_TAG);
next();
break;
default:
sym = install("", NS_TAG);
break;
}
if (!sym->type)
sym->type = mktype(NULL, tag, NULL);
tp = sym->type;
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)
unexpected();
sym = newiden();
sym->type = inttype;
if (accept('='))
initializer(sym);
sym->u.i = val++;
newfield(tp, sym);
if (!accept(','))
break;
}
expect('}');
return tp;
}
static Type *
parameter(void)
{
Symbol *sym;
int8_t sclass;
Type *tp;
if ((tp = specifier(&sclass)) == voidtype)
return tp;
sym = declarator(tp, ID_ACCEPTED);
sym->s.isdefined = 1;
/* TODO: check type of the parameter */
switch (sclass) {
case REGISTER:
sym->s.isregister = 1;
break;
case 0:
sym->s.isauto = 1;
break;
default:
error("bad storage class in function parameter");
}
return sym->type;
}
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 = sym->type->op != FTN;
switch (sclass) {
case TYPEDEF:
sym->token = TYPEIDEN;
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, ID_FORBIDDEN);
return sym->type;
}
void
extdecl(void)
{
Type *base, *tp;
int8_t sclass;
Symbol *sym;
extern Symbol *curfun;
switch (yytoken) {
case IDEN: case TYPE: case TYPEIDEN: 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 = TYPEIDEN;
continue;
}
if (tp->op != 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:
unexpected();
}
}