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/*
Copyright (C) 2019, 2020 Leo Tenenbaum.
This file is part of toc. toc is distributed under version 3 of the GNU General Public License, without any warranty whatsoever.
You should have received a copy of the GNU General Public License along with toc. If not, see <https://www.gnu.org/licenses/>.
*/
#if CHAR_MAX - CHAR_MIN > 255
#error "Currently only systems with 8-bit characters can compile toc."
/* TODO: not necessary anymore */
#endif
/* can this character be used in an identifier? */
static int is_ident(int c) {
if (c >= 'a' && c <= 'z')
return 1;
if (c >= 'A' && c <= 'Z')
return 1;
if (c >= '0' && c <= '9')
return 1;
if (c == '_') return 1;
#if CHAR_MIN < 0
if (c < 0) /* on systems where char = signed char, UTF-8 characters are probably < 0? */
return 1;
#endif
if (c > 127) /* UTF-8 */
return 1;
return 0;
}
/* Initialize Identifiers. */
static void idents_create(Identifiers *ids, Allocator *allocr, Block *scope) {
str_hash_table_create(&ids->table, sizeof(IdentSlot) - sizeof(StrHashTableSlot), allocr);
ids->rseed = 0x27182818;
ids->scope = scope;
}
/* advances s until a non-identifier character is reached, then returns the number of characters advanced */
static size_t ident_str_len_advance(char **s) {
char *original = *s;
while (is_ident(**s)) {
++*s;
}
return (size_t)(*s - original);
}
static size_t ident_str_len(char *s) {
return ident_str_len_advance(&s);
}
static U64 ident_hash(char **s) {
char *original = *s;
return str_hash(original, ident_str_len_advance(s));
}
/* are these strings equal, up to the first non-ident character? */
static bool ident_str_eq_str(const char *s, const char *t) {
while (is_ident(*s) && is_ident(*t)) {
if (*s != *t) return false;
++s, ++t;
}
return !is_ident(*s) && !is_ident(*t);
}
static inline bool ident_eq_str(Identifier i, const char *s) {
return ident_str_eq_str(i->str, s);
}
static IdentSlot **ident_slots_insert(IdentSlot **slots, char *s, size_t i) {
IdentSlot **slot;
size_t nslots = arr_len(slots);
while (1) {
slot = &slots[i];
if (!*slot) break;
if (s && ident_eq_str(*slot, s))
break;
i = (i+1) % nslots;
}
return slot;
}
/* moves s to the char after the identifier */
/* inserts if does not exist. reads until non-ident char is found. */
/* advances past identifier */
static Identifier ident_insert(Identifiers *ids, char **s) {
char *original = *s;
size_t len = ident_str_len_advance(s);
IdentSlot *slot = (IdentSlot *)str_hash_table_insert_(&ids->table, original, len);
slot->idents = ids;
return slot;
}
static char *ident_to_str(Identifier i) {
char *str = err_malloc(i->len + 1);
/* for some reason, GCC thinks that i->len is -1 when this is called from type_to_str_ (in release mode)
TODO: test this now (some stuff was changed)
*/
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wstringop-overflow"
#pragma GCC diagnostic ignored "-Wrestrict"
#pragma GCC diagnostic ignored "-Warray-bounds"
#endif
memcpy(str, i->str, i->len);
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
str[i->len] = 0;
return str;
}
static inline void fprint_ident_str(FILE *out, char *s) {
fwrite(s, 1, ident_str_len(s), out);
}
static void fprint_ident(FILE *out, Identifier id) {
fwrite(id->str, 1, id->len, out);
}
static void fprint_ident_debug(FILE *out, Identifier id) {
fprint_ident(out, id);
}
static void print_ident(Identifier id) {
fprint_ident_debug(stdout, id);
printf("\n");
}
/* reduced charset = a-z, A-Z, 0-9, _ */
static void fprint_ident_reduced_charset(FILE *out, Identifier id) {
assert(id);
for (const char *s = id->str; is_ident(*s); ++s) {
int c = (unsigned char)(*s);
if (c > 127) {
fprintf(out, "x__%02x", c);
} else {
putc(*s, out);
}
}
}
static char *ident_to_str_reduced_charset(Identifier id) {
assert(id);
size_t nchars = 0;
for (const char *s = id->str; is_ident(*s); ++s) {
int c = (unsigned char)(*s);
if (c > 127)
nchars += 5;
else
++nchars;
}
char *ret = err_malloc(nchars+1);
char *p = ret;
for (const char *s = id->str; is_ident(*s); ++s) {
int c = (unsigned char)(*s);
if (c > 127)
sprintf(p, "x__%02x", c);
else
*p = (char)c;
++p;
}
*p = 0;
assert(p == ret + nchars);
return ret;
}
/* NULL = no such identifier. returns identifier "foo" for both "foo\0" and "foo+92384324..." */
static Identifier ident_get(Identifiers *ids, char *s) {
size_t len = ident_str_len(s);
return (Identifier)str_hash_table_get_(&ids->table, s, len);
}
/* translate and insert if not already there */
static inline Identifier ident_translate_forced(Identifier i, Identifiers *to_idents) {
char *p = i->str;
Identifier translated = ident_insert(to_idents, &p);
assert(translated->idents == to_idents);
return translated;
}
/* translate but don't add it if it's not there */
static inline Identifier ident_translate(Identifier i, Identifiers *to_idents) {
return ident_get(to_idents, i->str);
}
/* returns true if i and j are equal, even if they're not in the same table */
static inline bool ident_eq(Identifier i, Identifier j) {
return i->len == j->len && memcmp(i->str, j->str, i->len) == 0;
}
static inline Block *ident_scope(Identifier i) {
return i->idents->scope;
}
#ifdef TOC_DEBUG
static void idents_test(void) {
Identifiers ids;
char b[] = "foo_variable bar";
char *s = b;
Allocator a;
allocr_create(&a);
idents_create(&ids, &a, NULL);
Identifier i1 = ident_insert(&ids, &s);
assert(strs_equal(s, " bar"));
char b2[] = "foo_variable+6";
s = b2;
Identifier i2 = ident_insert(&ids, &s);
assert(strs_equal(s, "+6"));
assert(i1 == i2);
allocr_free_all(&a);
}
#endif
static int ident_index_in_decl(Identifier i, Declaration *d) {
int index = 0;
arr_foreach(d->idents, Identifier, j) {
if (i == *j)
return index;
++index;
}
return -1;
}
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