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symbol.c
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/**********************************************************************
symbol.h -
$Author$
created at: Tue Jul 8 15:49:54 JST 2014
Copyright (C) 2014 Yukihiro Matsumoto
**********************************************************************/
#include "gc.h"
#include "internal.h"
#include "internal/error.h"
#include "internal/gc.h"
#include "internal/hash.h"
#include "internal/object.h"
#include "internal/symbol.h"
#include "internal/vm.h"
#include "probes.h"
#include "ruby/encoding.h"
#include "ruby/st.h"
#include "symbol.h"
#include "vm_sync.h"
#ifndef USE_SYMBOL_GC
# define USE_SYMBOL_GC 1
#endif
#ifndef SYMBOL_DEBUG
# define SYMBOL_DEBUG 0
#endif
#ifndef CHECK_ID_SERIAL
# define CHECK_ID_SERIAL SYMBOL_DEBUG
#endif
#define SYMBOL_PINNED_P(sym) (RSYMBOL(sym)->id&~ID_SCOPE_MASK)
#define STATIC_SYM2ID(sym) RSHIFT((VALUE)(sym), RUBY_SPECIAL_SHIFT)
static ID register_static_symid(ID, const char *, long, rb_encoding *);
static ID register_static_symid_str(ID, VALUE);
#define REGISTER_SYMID(id, name) register_static_symid((id), (name), strlen(name), enc)
#include "id.c"
#define is_identchar(p,e,enc) (ISALNUM((unsigned char)*(p)) || (*(p)) == '_' || !ISASCII(*(p)))
#define op_tbl_count numberof(op_tbl)
STATIC_ASSERT(op_tbl_name_size, sizeof(op_tbl[0].name) == 3);
#define op_tbl_len(i) (!op_tbl[i].name[1] ? 1 : !op_tbl[i].name[2] ? 2 : 3)
static void
Init_op_tbl(void)
{
int i;
rb_encoding *const enc = rb_usascii_encoding();
for (i = '!'; i <= '~'; ++i) {
if (!ISALNUM(i) && i != '_') {
char c = (char)i;
register_static_symid(i, &c, 1, enc);
}
}
for (i = 0; i < op_tbl_count; ++i) {
register_static_symid(op_tbl[i].token, op_tbl[i].name, op_tbl_len(i), enc);
}
}
static const int ID_ENTRY_UNIT = 512;
enum id_entry_type {
ID_ENTRY_STR,
ID_ENTRY_SYM,
ID_ENTRY_SIZE
};
rb_symbols_t ruby_global_symbols = {tNEXT_ID-1};
static const struct st_hash_type symhash = {
rb_str_hash_cmp,
rb_str_hash,
};
void
Init_sym(void)
{
rb_symbols_t *symbols = &ruby_global_symbols;
VALUE dsym_fstrs = rb_ident_hash_new();
symbols->dsymbol_fstr_hash = dsym_fstrs;
rb_gc_register_mark_object(dsym_fstrs);
rb_obj_hide(dsym_fstrs);
symbols->str_sym = st_init_table_with_size(&symhash, 1000);
symbols->ids = rb_ary_tmp_new(0);
rb_gc_register_mark_object(symbols->ids);
Init_op_tbl();
Init_id();
}
WARN_UNUSED_RESULT(static VALUE dsymbol_alloc(rb_symbols_t *symbols, const VALUE klass, const VALUE str, rb_encoding *const enc, const ID type));
WARN_UNUSED_RESULT(static VALUE dsymbol_check(rb_symbols_t *symbols, const VALUE sym));
WARN_UNUSED_RESULT(static ID lookup_str_id(VALUE str));
WARN_UNUSED_RESULT(static VALUE lookup_str_sym_with_lock(rb_symbols_t *symbols, const VALUE str));
WARN_UNUSED_RESULT(static VALUE lookup_str_sym(const VALUE str));
WARN_UNUSED_RESULT(static VALUE lookup_id_str(ID id));
WARN_UNUSED_RESULT(static ID intern_str(VALUE str, int mutable));
#define GLOBAL_SYMBOLS_ENTER(symbols) rb_symbols_t *symbols = &ruby_global_symbols; RB_VM_LOCK_ENTER()
#define GLOBAL_SYMBOLS_LEAVE() RB_VM_LOCK_LEAVE()
ID
rb_id_attrset(ID id)
{
VALUE str, sym;
int scope;
if (!is_notop_id(id)) {
switch (id) {
case tAREF: case tASET:
return tASET; /* only exception */
}
rb_name_error(id, "cannot make operator ID :%"PRIsVALUE" attrset",
rb_id2str(id));
}
else {
scope = id_type(id);
switch (scope) {
case ID_LOCAL: case ID_INSTANCE: case ID_GLOBAL:
case ID_CONST: case ID_CLASS: case ID_JUNK:
break;
case ID_ATTRSET:
return id;
default:
{
if ((str = lookup_id_str(id)) != 0) {
rb_name_error(id, "cannot make unknown type ID %d:%"PRIsVALUE" attrset",
scope, str);
}
else {
rb_name_error_str(Qnil, "cannot make unknown type anonymous ID %d:%"PRIxVALUE" attrset",
scope, (VALUE)id);
}
}
}
}
/* make new symbol and ID */
if (!(str = lookup_id_str(id))) {
static const char id_types[][8] = {
"local",
"instance",
"invalid",
"global",
"attrset",
"const",
"class",
"junk",
};
rb_name_error(id, "cannot make anonymous %.*s ID %"PRIxVALUE" attrset",
(int)sizeof(id_types[0]), id_types[scope], (VALUE)id);
}
str = rb_str_dup(str);
rb_str_cat(str, "=", 1);
sym = lookup_str_sym(str);
id = sym ? rb_sym2id(sym) : intern_str(str, 1);
return id;
}
static int
is_special_global_name(const char *m, const char *e, rb_encoding *enc)
{
int mb = 0;
if (m >= e) return 0;
if (is_global_name_punct(*m)) {
++m;
}
else if (*m == '-') {
if (++m >= e) return 0;
if (is_identchar(m, e, enc)) {
if (!ISASCII(*m)) mb = 1;
m += rb_enc_mbclen(m, e, enc);
}
}
else {
if (!ISDIGIT(*m)) return 0;
do {
if (!ISASCII(*m)) mb = 1;
++m;
} while (m < e && ISDIGIT(*m));
}
return m == e ? mb + 1 : 0;
}
int
rb_symname_p(const char *name)
{
return rb_enc_symname_p(name, rb_ascii8bit_encoding());
}
int
rb_enc_symname_p(const char *name, rb_encoding *enc)
{
return rb_enc_symname2_p(name, strlen(name), enc);
}
static int
rb_sym_constant_char_p(const char *name, long nlen, rb_encoding *enc)
{
int c, len;
const char *end = name + nlen;
if (nlen < 1) return FALSE;
if (ISASCII(*name)) return ISUPPER(*name);
c = rb_enc_precise_mbclen(name, end, enc);
if (!MBCLEN_CHARFOUND_P(c)) return FALSE;
len = MBCLEN_CHARFOUND_LEN(c);
c = rb_enc_mbc_to_codepoint(name, end, enc);
if (ONIGENC_IS_UNICODE(enc)) {
static int ctype_titlecase = 0;
if (rb_enc_isupper(c, enc)) return TRUE;
if (rb_enc_islower(c, enc)) return FALSE;
if (!ctype_titlecase) {
static const UChar cname[] = "titlecaseletter";
static const UChar *const end = cname + sizeof(cname) - 1;
ctype_titlecase = ONIGENC_PROPERTY_NAME_TO_CTYPE(enc, cname, end);
}
if (rb_enc_isctype(c, ctype_titlecase, enc)) return TRUE;
}
else {
/* fallback to case-folding */
OnigUChar fold[ONIGENC_GET_CASE_FOLD_CODES_MAX_NUM];
const OnigUChar *beg = (const OnigUChar *)name;
int r = enc->mbc_case_fold(ONIGENC_CASE_FOLD,
&beg, (const OnigUChar *)end,
fold, enc);
if (r > 0 && (r != len || memcmp(fold, name, r)))
return TRUE;
}
return FALSE;
}
#define IDSET_ATTRSET_FOR_SYNTAX ((1U<<ID_LOCAL)|(1U<<ID_CONST))
#define IDSET_ATTRSET_FOR_INTERN (~(~0U<<(1<<ID_SCOPE_SHIFT)) & ~(1U<<ID_ATTRSET))
struct enc_synmane_type_leading_chars_tag {
const enum { invalid, stophere, needmore, } kind;
const enum ruby_id_types type;
const long nread;
};
#define t struct enc_synmane_type_leading_chars_tag
static struct enc_synmane_type_leading_chars_tag
enc_synmane_type_leading_chars(const char *name, long len, rb_encoding *enc, int allowed_attrset)
{
const char *m = name;
const char *e = m + len;
if (! rb_enc_asciicompat(enc)) {
return (t) { invalid, 0, 0, };
}
else if (! m) {
return (t) { invalid, 0, 0, };
}
else if ( len <= 0 ) {
return (t) { invalid, 0, 0, };
}
switch (*m) {
case '\0':
return (t) { invalid, 0, 0, };
case '$':
if (is_special_global_name(++m, e, enc)) {
return (t) { stophere, ID_GLOBAL, len, };
}
else {
return (t) { needmore, ID_GLOBAL, 1, };
}
case '@':
switch (*++m) {
default: return (t) { needmore, ID_INSTANCE, 1, };
case '@': return (t) { needmore, ID_CLASS, 2, };
}
case '<':
switch (*++m) {
default: return (t) { stophere, ID_JUNK, 1, };
case '<': return (t) { stophere, ID_JUNK, 2, };
case '=':
switch (*++m) {
default: return (t) { stophere, ID_JUNK, 2, };
case '>': return (t) { stophere, ID_JUNK, 3, };
}
}
case '>':
switch (*++m) {
default: return (t) { stophere, ID_JUNK, 1, };
case '>': case '=': return (t) { stophere, ID_JUNK, 2, };
}
case '=':
switch (*++m) {
default: return (t) { invalid, 0, 1, };
case '~': return (t) { stophere, ID_JUNK, 2, };
case '=':
switch (*++m) {
default: return (t) { stophere, ID_JUNK, 2, };
case '=': return (t) { stophere, ID_JUNK, 3, };
}
}
case '*':
switch (*++m) {
default: return (t) { stophere, ID_JUNK, 1, };
case '*': return (t) { stophere, ID_JUNK, 2, };
}
case '+': case '-':
switch (*++m) {
default: return (t) { stophere, ID_JUNK, 1, };
case '@': return (t) { stophere, ID_JUNK, 2, };
}
case '|': case '^': case '&': case '/': case '%': case '~': case '`':
return (t) { stophere, ID_JUNK, 1, };
case '[':
switch (*++m) {
default: return (t) { needmore, ID_JUNK, 0, };
case ']':
switch (*++m) {
default: return (t) { stophere, ID_JUNK, 2, };
case '=': return (t) { stophere, ID_JUNK, 3, };
}
}
case '!':
switch (*++m) {
case '=': case '~': return (t) { stophere, ID_JUNK, 2, };
default:
if (allowed_attrset & (1U << ID_JUNK)) {
return (t) { needmore, ID_JUNK, 1, };
}
else {
return (t) { stophere, ID_JUNK, 1, };
}
}
default:
if (rb_sym_constant_char_p(name, len, enc)) {
return (t) { needmore, ID_CONST, 0, };
}
else {
return (t) { needmore, ID_LOCAL, 0, };
}
}
}
#undef t
int
rb_enc_symname_type(const char *name, long len, rb_encoding *enc, unsigned int allowed_attrset)
{
const struct enc_synmane_type_leading_chars_tag f =
enc_synmane_type_leading_chars(name, len, enc, allowed_attrset);
const char *m = name + f.nread;
const char *e = name + len;
int type = (int)f.type;
switch (f.kind) {
case invalid: return -1;
case stophere: break;
case needmore:
if (m >= e || (*m != '_' && !ISALPHA(*m) && ISASCII(*m))) {
if (len > 1 && *(e-1) == '=') {
type = rb_enc_symname_type(name, len-1, enc, allowed_attrset);
if (type != ID_ATTRSET) return ID_ATTRSET;
}
return -1;
}
while (m < e && is_identchar(m, e, enc)) m += rb_enc_mbclen(m, e, enc);
if (m >= e) break;
switch (*m) {
case '!': case '?':
if (type == ID_GLOBAL || type == ID_CLASS || type == ID_INSTANCE) return -1;
type = ID_JUNK;
++m;
if (m + 1 < e || *m != '=') break;
/* fall through */
case '=':
if (!(allowed_attrset & (1U << type))) return -1;
type = ID_ATTRSET;
++m;
break;
}
}
return m == e ? type : -1;
}
int
rb_enc_symname2_p(const char *name, long len, rb_encoding *enc)
{
return rb_enc_symname_type(name, len, enc, IDSET_ATTRSET_FOR_SYNTAX) != -1;
}
static int
rb_str_symname_type(VALUE name, unsigned int allowed_attrset)
{
const char *ptr = StringValuePtr(name);
long len = RSTRING_LEN(name);
int type = rb_enc_symname_type(ptr, len, rb_enc_get(name), allowed_attrset);
RB_GC_GUARD(name);
return type;
}
static void
set_id_entry(rb_symbols_t *symbols, rb_id_serial_t num, VALUE str, VALUE sym)
{
ASSERT_vm_locking();
size_t idx = num / ID_ENTRY_UNIT;
VALUE ary, ids = symbols->ids;
if (idx >= (size_t)RARRAY_LEN(ids) || NIL_P(ary = rb_ary_entry(ids, (long)idx))) {
ary = rb_ary_tmp_new(ID_ENTRY_UNIT * ID_ENTRY_SIZE);
rb_ary_store(ids, (long)idx, ary);
}
idx = (num % ID_ENTRY_UNIT) * ID_ENTRY_SIZE;
rb_ary_store(ary, (long)idx + ID_ENTRY_STR, str);
rb_ary_store(ary, (long)idx + ID_ENTRY_SYM, sym);
}
static VALUE
get_id_serial_entry(rb_id_serial_t num, ID id, const enum id_entry_type t)
{
VALUE result = 0;
GLOBAL_SYMBOLS_ENTER(symbols);
{
if (num && num <= symbols->last_id) {
size_t idx = num / ID_ENTRY_UNIT;
VALUE ids = symbols->ids;
VALUE ary;
if (idx < (size_t)RARRAY_LEN(ids) && !NIL_P(ary = rb_ary_entry(ids, (long)idx))) {
long pos = (long)(num % ID_ENTRY_UNIT) * ID_ENTRY_SIZE;
result = rb_ary_entry(ary, pos + t);
if (NIL_P(result)) {
result = 0;
}
else {
#if CHECK_ID_SERIAL
if (id) {
VALUE sym = result;
if (t != ID_ENTRY_SYM)
sym = rb_ary_entry(ary, pos + ID_ENTRY_SYM);
if (STATIC_SYM_P(sym)) {
if (STATIC_SYM2ID(sym) != id) result = 0;
}
else {
if (RSYMBOL(sym)->id != id) result = 0;
}
}
#endif
}
}
}
}
GLOBAL_SYMBOLS_LEAVE();
return result;
}
static VALUE
get_id_entry(ID id, const enum id_entry_type t)
{
return get_id_serial_entry(rb_id_to_serial(id), id, t);
}
static inline ID
rb_id_serial_to_id(rb_id_serial_t num)
{
if (is_notop_id((ID)num)) {
VALUE sym = get_id_serial_entry(num, 0, ID_ENTRY_SYM);
if (sym) return SYM2ID(sym);
return ((ID)num << ID_SCOPE_SHIFT) | ID_INTERNAL | ID_STATIC_SYM;
}
else {
return (ID)num;
}
}
#if SYMBOL_DEBUG
static int
register_sym_update_callback(st_data_t *key, st_data_t *value, st_data_t arg, int existing)
{
if (existing) {
rb_fatal("symbol :% "PRIsVALUE" is already registered with %"PRIxVALUE,
(VALUE)*key, (VALUE)*value);
}
*value = arg;
return ST_CONTINUE;
}
#endif
static void
register_sym(rb_symbols_t *symbols, VALUE str, VALUE sym)
{
ASSERT_vm_locking();
#if SYMBOL_DEBUG
st_update(symbols->str_sym, (st_data_t)str,
register_sym_update_callback, (st_data_t)sym);
#else
st_add_direct(symbols->str_sym, (st_data_t)str, (st_data_t)sym);
#endif
}
static void
unregister_sym(rb_symbols_t *symbols, VALUE str, VALUE sym)
{
ASSERT_vm_locking();
st_data_t str_data = (st_data_t)str;
if (!st_delete(symbols->str_sym, &str_data, NULL)) {
rb_bug("%p can't remove str from str_id (%s)", (void *)sym, RSTRING_PTR(str));
}
}
static ID
register_static_symid(ID id, const char *name, long len, rb_encoding *enc)
{
VALUE str = rb_enc_str_new(name, len, enc);
return register_static_symid_str(id, str);
}
static ID
register_static_symid_str(ID id, VALUE str)
{
rb_id_serial_t num = rb_id_to_serial(id);
VALUE sym = STATIC_ID2SYM(id);
OBJ_FREEZE(str);
str = rb_fstring(str);
RUBY_DTRACE_CREATE_HOOK(SYMBOL, RSTRING_PTR(str));
GLOBAL_SYMBOLS_ENTER(symbols)
{
register_sym(symbols, str, sym);
set_id_entry(symbols, num, str, sym);
}
GLOBAL_SYMBOLS_LEAVE();
return id;
}
static int
sym_check_asciionly(VALUE str)
{
if (!rb_enc_asciicompat(rb_enc_get(str))) return FALSE;
switch (rb_enc_str_coderange(str)) {
case ENC_CODERANGE_BROKEN:
rb_raise(rb_eEncodingError, "invalid symbol in encoding %s :%+"PRIsVALUE,
rb_enc_name(rb_enc_get(str)), str);
case ENC_CODERANGE_7BIT:
return TRUE;
}
return FALSE;
}
#if 0
/*
* _str_ itself will be registered at the global symbol table. _str_
* can be modified before the registration, since the encoding will be
* set to ASCII-8BIT if it is a special global name.
*/
static inline void
must_be_dynamic_symbol(VALUE x)
{
if (UNLIKELY(!DYNAMIC_SYM_P(x))) {
if (STATIC_SYM_P(x)) {
VALUE str = lookup_id_str(RSHIFT((unsigned long)(x),RUBY_SPECIAL_SHIFT));
if (str) {
rb_bug("wrong argument: %s (inappropriate Symbol)", RSTRING_PTR(str));
}
else {
rb_bug("wrong argument: inappropriate Symbol (%p)", (void *)x);
}
}
else {
rb_bug("wrong argument type %s (expected Symbol)", rb_builtin_class_name(x));
}
}
}
#endif
static VALUE
dsymbol_alloc(rb_symbols_t *symbols, const VALUE klass, const VALUE str, rb_encoding * const enc, const ID type)
{
ASSERT_vm_locking();
const VALUE dsym = rb_newobj_of(klass, T_SYMBOL | FL_WB_PROTECTED);
long hashval;
rb_enc_set_index(dsym, rb_enc_to_index(enc));
OBJ_FREEZE(dsym);
RB_OBJ_WRITE(dsym, &RSYMBOL(dsym)->fstr, str);
RSYMBOL(dsym)->id = type;
/* we want hashval to be in Fixnum range [ruby-core:15713] r15672 */
hashval = (long)rb_str_hash(str);
RSYMBOL(dsym)->hashval = RSHIFT((long)hashval, 1);
register_sym(symbols, str, dsym);
rb_hash_aset(symbols->dsymbol_fstr_hash, str, Qtrue);
RUBY_DTRACE_CREATE_HOOK(SYMBOL, RSTRING_PTR(RSYMBOL(dsym)->fstr));
return dsym;
}
static inline VALUE
dsymbol_check(rb_symbols_t *symbols, const VALUE sym)
{
ASSERT_vm_locking();
if (UNLIKELY(rb_objspace_garbage_object_p(sym))) {
const VALUE fstr = RSYMBOL(sym)->fstr;
const ID type = RSYMBOL(sym)->id & ID_SCOPE_MASK;
RSYMBOL(sym)->fstr = 0;
unregister_sym(symbols, fstr, sym);
return dsymbol_alloc(symbols, rb_cSymbol, fstr, rb_enc_get(fstr), type);
}
else {
return sym;
}
}
static ID
lookup_str_id(VALUE str)
{
st_data_t sym_data;
int found;
GLOBAL_SYMBOLS_ENTER(symbols);
{
found = st_lookup(symbols->str_sym, (st_data_t)str, &sym_data);
}
GLOBAL_SYMBOLS_LEAVE();
if (found) {
const VALUE sym = (VALUE)sym_data;
if (STATIC_SYM_P(sym)) {
return STATIC_SYM2ID(sym);
}
else if (DYNAMIC_SYM_P(sym)) {
ID id = RSYMBOL(sym)->id;
if (id & ~ID_SCOPE_MASK) return id;
}
else {
rb_bug("non-symbol object %s:%"PRIxVALUE" for %"PRIsVALUE" in symbol table",
rb_builtin_class_name(sym), sym, str);
}
}
return (ID)0;
}
static VALUE
lookup_str_sym_with_lock(rb_symbols_t *symbols, const VALUE str)
{
st_data_t sym_data;
if (st_lookup(symbols->str_sym, (st_data_t)str, &sym_data)) {
VALUE sym = (VALUE)sym_data;
if (DYNAMIC_SYM_P(sym)) {
sym = dsymbol_check(symbols, sym);
}
return sym;
}
else {
return Qfalse;
}
}
static VALUE
lookup_str_sym(const VALUE str)
{
VALUE sym;
GLOBAL_SYMBOLS_ENTER(symbols);
{
sym = lookup_str_sym_with_lock(symbols, str);
}
GLOBAL_SYMBOLS_LEAVE();
return sym;
}
static VALUE
lookup_id_str(ID id)
{
return get_id_entry(id, ID_ENTRY_STR);
}
ID
rb_intern3(const char *name, long len, rb_encoding *enc)
{
VALUE sym;
struct RString fake_str;
VALUE str = rb_setup_fake_str(&fake_str, name, len, enc);
OBJ_FREEZE(str);
sym = lookup_str_sym(str);
if (sym) return rb_sym2id(sym);
str = rb_enc_str_new(name, len, enc); /* make true string */
return intern_str(str, 1);
}
static ID
next_id_base_with_lock(rb_symbols_t *symbols)
{
ID id;
rb_id_serial_t next_serial = symbols->last_id + 1;
if (next_serial == 0) {
id = (ID)-1;
}
else {
const size_t num = ++symbols->last_id;
id = num << ID_SCOPE_SHIFT;
}
return id;
}
static ID
next_id_base(void)
{
ID id;
GLOBAL_SYMBOLS_ENTER(symbols);
{
id = next_id_base_with_lock(symbols);
}
GLOBAL_SYMBOLS_LEAVE();
return id;
}
static ID
intern_str(VALUE str, int mutable)
{
ID id;
ID nid;
id = rb_str_symname_type(str, IDSET_ATTRSET_FOR_INTERN);
if (id == (ID)-1) id = ID_JUNK;
if (sym_check_asciionly(str)) {
if (!mutable) str = rb_str_dup(str);
rb_enc_associate(str, rb_usascii_encoding());
}
if ((nid = next_id_base()) == (ID)-1) {
str = rb_str_ellipsize(str, 20);
rb_raise(rb_eRuntimeError, "symbol table overflow (symbol %"PRIsVALUE")",
str);
}
id |= nid;
id |= ID_STATIC_SYM;
return register_static_symid_str(id, str);
}
ID
rb_intern2(const char *name, long len)
{
return rb_intern3(name, len, rb_usascii_encoding());
}
#undef rb_intern
ID
rb_intern(const char *name)
{
return rb_intern2(name, strlen(name));
}
ID
rb_intern_str(VALUE str)
{
VALUE sym = lookup_str_sym(str);
if (sym) {
return SYM2ID(sym);
}
return intern_str(str, 0);
}
void
rb_gc_free_dsymbol(VALUE sym)
{
VALUE str = RSYMBOL(sym)->fstr;
if (str) {
RSYMBOL(sym)->fstr = 0;
GLOBAL_SYMBOLS_ENTER(symbols);
{
unregister_sym(symbols, str, sym);
rb_hash_delete_entry(symbols->dsymbol_fstr_hash, str);
}
GLOBAL_SYMBOLS_LEAVE();
}
}
/*
* call-seq:
* str.intern -> symbol
* str.to_sym -> symbol
*
* Returns the Symbol corresponding to <i>str</i>, creating the
* symbol if it did not previously exist. See Symbol#id2name.
*
* "Koala".intern #=> :Koala
* s = 'cat'.to_sym #=> :cat
* s == :cat #=> true
* s = '@cat'.to_sym #=> :@cat
* s == :@cat #=> true
*
* This can also be used to create symbols that cannot be represented using the
* <code>:xxx</code> notation.
*
* 'cat and dog'.to_sym #=> :"cat and dog"
*/
VALUE
rb_str_intern(VALUE str)
{
VALUE sym;
#if USE_SYMBOL_GC
rb_encoding *enc, *ascii;
int type;
#else
ID id;
#endif
GLOBAL_SYMBOLS_ENTER(symbols);
{
sym = lookup_str_sym_with_lock(symbols, str);
if (sym) {
// ok
}
else {
#if USE_SYMBOL_GC
enc = rb_enc_get(str);
ascii = rb_usascii_encoding();
if (enc != ascii && sym_check_asciionly(str)) {
str = rb_str_dup(str);
rb_enc_associate(str, ascii);
OBJ_FREEZE(str);
enc = ascii;
}
else {
str = rb_str_dup(str);
OBJ_FREEZE(str);
}
str = rb_fstring(str);
type = rb_str_symname_type(str, IDSET_ATTRSET_FOR_INTERN);
if (type < 0) type = ID_JUNK;
sym = dsymbol_alloc(symbols, rb_cSymbol, str, enc, type);
#else
id = intern_str(str, 0);
sym = ID2SYM(id);
#endif
}
}
GLOBAL_SYMBOLS_LEAVE();
return sym;
}
ID
rb_sym2id(VALUE sym)
{
ID id;
if (STATIC_SYM_P(sym)) {
id = STATIC_SYM2ID(sym);
}
else if (DYNAMIC_SYM_P(sym)) {
GLOBAL_SYMBOLS_ENTER(symbols);
{
sym = dsymbol_check(symbols, sym);
id = RSYMBOL(sym)->id;
if (UNLIKELY(!(id & ~ID_SCOPE_MASK))) {
VALUE fstr = RSYMBOL(sym)->fstr;
ID num = next_id_base_with_lock(symbols);
RSYMBOL(sym)->id = id |= num;
/* make it permanent object */
set_id_entry(symbols, rb_id_to_serial(num), fstr, sym);
rb_hash_delete_entry(symbols->dsymbol_fstr_hash, fstr);
}
}
GLOBAL_SYMBOLS_LEAVE();
}
else {
rb_raise(rb_eTypeError, "wrong argument type %s (expected Symbol)",
rb_builtin_class_name(sym));
}
return id;
}
#undef rb_id2sym
VALUE
rb_id2sym(ID x)
{
if (!DYNAMIC_ID_P(x)) return STATIC_ID2SYM(x);
return get_id_entry(x, ID_ENTRY_SYM);
}
VALUE
rb_sym2str(VALUE sym)
{
if (DYNAMIC_SYM_P(sym)) {
return RSYMBOL(sym)->fstr;
}
else {
return rb_id2str(STATIC_SYM2ID(sym));
}
}
VALUE
rb_id2str(ID id)
{
return lookup_id_str(id);
}
const char *
rb_id2name(ID id)
{
VALUE str = rb_id2str(id);
if (!str) return 0;
return RSTRING_PTR(str);
}
ID
rb_make_internal_id(void)
{
return next_id_base() | ID_INTERNAL | ID_STATIC_SYM;
}
ID
rb_make_temporary_id(size_t n)
{
const ID max_id = RB_ID_SERIAL_MAX & ~0xffff;
const ID id = max_id - (ID)n;
if (id <= ruby_global_symbols.last_id) {
rb_raise(rb_eRuntimeError, "too big to make temporary ID: %" PRIdSIZE, n);
}
return (id << ID_SCOPE_SHIFT) | ID_STATIC_SYM | ID_INTERNAL;
}
static int
symbols_i(st_data_t key, st_data_t value, st_data_t arg)
{
VALUE ary = (VALUE)arg;
VALUE sym = (VALUE)value;
if (STATIC_SYM_P(sym)) {
rb_ary_push(ary, sym);
return ST_CONTINUE;
}
else if (!DYNAMIC_SYM_P(sym)) {
rb_bug("invalid symbol: %s", RSTRING_PTR((VALUE)key));
}
else if (!SYMBOL_PINNED_P(sym) && rb_objspace_garbage_object_p(sym)) {
RSYMBOL(sym)->fstr = 0;
return ST_DELETE;
}
else {
rb_ary_push(ary, sym);
return ST_CONTINUE;
}
}
VALUE
rb_sym_all_symbols(void)
{
VALUE ary;
GLOBAL_SYMBOLS_ENTER(symbols);
{
ary = rb_ary_new2(symbols->str_sym->num_entries);
st_foreach(symbols->str_sym, symbols_i, ary);
}
GLOBAL_SYMBOLS_LEAVE();