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added enum, typedefs, goto, switch

tcc-xref
bellard 2001-10-30 22:43:19 +00:00
parent 4e92bac070
commit b15f269fbe
1 changed files with 172 additions and 35 deletions
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207
tcc.c
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@ -15,7 +15,7 @@
prog: output code
astk: arg position stack
*/
int tok, *vac, *vat, rsym,
int tok, tok1, *vac, *vat, rsym,
prog, ind, loc, glo, file, vt,
vc, *macro_stack, *macro_stack_ptr, line_num;
char *idtable, *idptr, *filename;
@ -62,7 +62,10 @@ char *idtable, *idptr, *filename;
#define VT_STATIC 0x10000 /* static variable */
/* Special infos */
#define VT_LABEL 0x40000 /* goto label symbol */
#define VT_DEFINE 0x80000 /* special value for #defined symbols */
#define VT_ENUM 0x100000 /* enum definition */
#define VT_TYPEDEF 0x200000 /* typedef definition */
/* token values */
#define TOK_INT 256
@ -97,8 +100,8 @@ char *idtable, *idptr, *filename;
#define TOK_DOUBLE 281
#define TOK_STRUCT 282
#define TOK_UNION 283
#define TOK_TYPEDEF 284
#define TOK_TYPEDEF 284
#define TOK_DEFAULT 285
#define TOK_ENUM 286
@ -214,6 +217,13 @@ void next()
int c, v;
char *q, *p;
/* special 'ungettok' case for label parsing */
if (tok1) {
tok = tok1;
tok1 = 0;
return;
}
while(1) {
c = inp();
#ifndef TINY
@ -543,32 +553,72 @@ void gen_op(op, l)
}
}
int expr_const()
{
expr_eq();
if ((vt & (VT_CONST | VT_LVAL)) != VT_CONST)
error("constant expected");
return vc;
}
/* return 0 if no type declaration. otherwise, return the basic type
and skip it.
XXX: A '2' is ored to ensure non zero return if int type.
*/
int ist()
{
int t;
int t, n, v;
t = 0;
while(1) {
if (tok == TOK_CHAR | tok == TOK_VOID) {
t |= VT_BYTE;
} else if (tok == TOK_INT |
(tok >= TOK_CONST & tok <= TOK_SIGNED)) {
/* ignored types */
} else if (tok >= TOK_FLOAT & tok <= TOK_TYPEDEF) {
error("unsupported type");
} else if (tok == TOK_EXTERN) {
t |= VT_EXTERN;
} else if (tok == TOK_STATIC) {
t |= VT_STATIC;
} else if (tok == TOK_UNSIGNED) {
t |= VT_UNSIGNED;
if (tok == TOK_ENUM) {
next();
if (tok != '{')
next();
if (tok == '{') {
next();
n = 0;
while (tok != '}' & tok != -1) {
v = tok;
next();
if (tok == '=') {
next();
n = expr_const();
}
vat[v] = VT_CONST;
vac[v] = n;
if (tok != ',')
break;
next();
n++;
}
skip('}');
}
t |= VT_ENUM;
} else {
break;
if (tok == TOK_CHAR | tok == TOK_VOID) {
t |= VT_BYTE;
} else if (tok == TOK_INT |
(tok >= TOK_CONST & tok <= TOK_SIGNED)) {
/* ignored types */
} else if (tok >= TOK_FLOAT & tok <= TOK_UNION) {
error("unsupported type");
} else if (tok == TOK_EXTERN) {
t |= VT_EXTERN;
} else if (tok == TOK_STATIC) {
t |= VT_STATIC;
} else if (tok == TOK_UNSIGNED) {
t |= VT_UNSIGNED;
} else if (tok == TOK_TYPEDEF) {
t |= VT_TYPEDEF;
} else {
v = vat[tok];
if (!(v & VT_TYPEDEF))
break;
t = v & ~VT_TYPEDEF;
}
next();
}
next();
t |= 2;
}
return t;
@ -630,14 +680,13 @@ int typ(int *v, int t, int *array_size_ptr)
if (t & VT_ARRAY)
error("multi dimension arrays not supported");
next();
vc = 0;
n = 0;
if (tok != ']') {
expr();
n = expr_const();
if (array_size_ptr)
*array_size_ptr = vc;
*array_size_ptr = n;
}
if ((vt & (VT_CONST | VT_LVAL)) != VT_CONST |
(vc <= 0 & array_size_ptr != 0))
if (n <= 0 & array_size_ptr != 0)
error("invalid array size");
skip(']');
t = (t + VT_PTRINC) | VT_ARRAY;
@ -1030,7 +1079,7 @@ void expr()
#endif
void block(int *bsym, int *csym)
void block(int *bsym, int *csym, int *case_sym, int *def_sym)
{
int a, b, c, d;
@ -1041,13 +1090,13 @@ void block(int *bsym, int *csym)
expr();
skip(')');
a = gtst(1, 0);
block(bsym, csym);
block(bsym, csym, case_sym, def_sym);
c = tok;
if (c == TOK_ELSE) {
next();
d = psym(0xe9, 0); /* jmp */
gsym(a);
block(bsym, csym);
block(bsym, csym, case_sym, def_sym);
gsym(d); /* patch else jmp */
} else
gsym(a);
@ -1059,7 +1108,7 @@ void block(int *bsym, int *csym)
skip(')');
a = gtst(1, 0);
b = 0;
block(&a, &b);
block(&a, &b, case_sym, def_sym);
oad(0xe9, d - ind - 5); /* jmp */
gsym(a);
gsym_addr(b, d);
@ -1068,7 +1117,7 @@ void block(int *bsym, int *csym)
/* declarations */
decl(VT_LOCAL);
while (tok != '}')
block(bsym, csym);
block(bsym, csym, case_sym, def_sym);
next();
} else if (tok == TOK_RETURN) {
next();
@ -1118,7 +1167,7 @@ void block(int *bsym, int *csym)
gsym(e);
}
skip(')');
block(&a, &b);
block(&a, &b, case_sym, def_sym);
oad(0xe9, c - ind - 5); /* jmp */
gsym(a);
gsym_addr(b, c);
@ -1128,7 +1177,7 @@ void block(int *bsym, int *csym)
a = 0;
b = 0;
d = ind;
block(&a, &b);
block(&a, &b, case_sym, def_sym);
skip(TOK_WHILE);
skip('(');
gsym(b);
@ -1138,11 +1187,91 @@ void block(int *bsym, int *csym)
skip(')');
gsym(a);
} else
if (tok == TOK_SWITCH) {
next();
skip('(');
expr();
gv();
skip(')');
a = 0;
b = 0;
c = 0;
block(&a, csym, &b, &c);
/* if no default, jmp after switch */
if (c == 0)
c = ind;
/* default label */
gsym_addr(b, c);
/* break label */
gsym(a);
} else
if (tok == TOK_CASE) {
next();
a = expr_const();
if (!case_sym)
error("switch expected");
gsym(*case_sym);
oad(0x3d, a); /* cmp $xxx, %eax */
*case_sym = psym(0x850f, 0); /* jne xxx */
skip(':');
block(bsym, csym, case_sym, def_sym);
} else
if (tok == TOK_DEFAULT) {
next();
skip(':');
if (!def_sym)
error("switch expected");
if (*def_sym)
error("too many 'default'");
*def_sym = ind;
block(bsym, csym, case_sym, def_sym);
} else
if (tok == TOK_GOTO) {
next();
a = vat[tok];
if (a == 0) {
/* put forward definition */
a = VT_LABEL | VT_FORWARD;
vat[tok] = a;
vac[tok] = 0;
} else if (!(a & VT_LABEL))
error("invalid label name");
/* label already defined */
if (a & VT_FORWARD)
vac[tok] = psym(0xe9, vac[tok]); /* jmp xxx */
else
oad(0xe9, vac[tok] - ind - 5); /* jmp xxx */
next();
skip(';');
} else
#endif
{
if (tok != ';')
expr();
skip(';');
b = tok;
next();
if (tok == ':') {
next();
/* label case */
a = vat[b];
if (a != 0) {
if (!(a & VT_LABEL))
error("invalid label name");
else if (!(a & VT_FORWARD))
error("multiple defined label");
gsym(vac[b]);
}
vac[b] = ind;
vat[b] = VT_LABEL;
block(bsym, csym, case_sym, def_sym);
} else {
/* expression case: go backward of one token */
/* XXX: currently incorrect if number/string/char */
tok1 = tok;
tok = b;
if (tok != ';') {
expr();
}
skip(';');
}
}
}
@ -1152,6 +1281,12 @@ void decl(l)
int *a, t, b, s, align, v, u, n;
while (b = ist()) {
if ((b & VT_ENUM) && tok == ';') {
/* we accept no variable after */
next();
continue;
}
while (1) { /* iterate thru each declaration */
s = 1;
t = typ(&v, b, &s);
@ -1166,14 +1301,16 @@ void decl(l)
o(0xe58955); /* push %ebp, mov %esp, %ebp */
a = oad(0xec81, 0); /* sub $xxx, %esp */
rsym = 0;
block(0, 0);
block(0, 0, 0, 0);
gsym(rsym);
o(0xc3c9); /* leave, ret */
*a = (-loc + 3) & -4; /* align local size to word &
save local variables */
break;
} else {
if (t & VT_FUNC) {
if (t & VT_TYPEDEF) {
vat[v] = t; /* save typedefed type */
} else if (t & VT_FUNC) {
/* external function definition */
external_func(v, t);
} else {