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ruby/variable.c

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/**********************************************************************
variable.c -
$Author$
created at: Tue Apr 19 23:55:15 JST 1994
Copyright (C) 1993-2007 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#include "internal.h"
#include "ruby/st.h"
#include "ruby/util.h"
#include "id_table.h"
#include "constant.h"
#include "id.h"
#include "ccan/list/list.h"
#include "id_table.h"
struct rb_id_table *rb_global_tbl;
static ID autoload, classpath, tmp_classpath, classid;
static void check_before_mod_set(VALUE, ID, VALUE, const char *);
static void setup_const_entry(rb_const_entry_t *, VALUE, VALUE, rb_const_flag_t);
static st_table *generic_iv_tbl;
static st_table *generic_iv_tbl_compat;
/* per-object */
struct gen_ivtbl {
long numiv; /* only uses 32-bits */
VALUE ivptr[1]; /* flexible array */
};
struct ivar_update {
union {
st_table *iv_index_tbl;
struct gen_ivtbl *ivtbl;
} u;
st_data_t index;
int iv_extended;
};
void
Init_var_tables(void)
{
rb_global_tbl = rb_id_table_create(0);
generic_iv_tbl = st_init_numtable();
autoload = rb_intern_const("__autoload__");
/* __classpath__: fully qualified class path */
classpath = rb_intern_const("__classpath__");
/* __tmp_classpath__: temporary class path which contains anonymous names */
tmp_classpath = rb_intern_const("__tmp_classpath__");
/* __classid__: name given to class/module under an anonymous namespace */
classid = rb_intern_const("__classid__");
}
struct fc_result {
ID name, preferred;
VALUE klass;
VALUE path;
VALUE track;
struct fc_result *prev;
};
static VALUE
fc_path(struct fc_result *fc, ID name)
{
VALUE path, tmp;
path = rb_id2str(name);
while (fc) {
st_data_t n;
if (fc->track == rb_cObject) break;
if (RCLASS_IV_TBL(fc->track) &&
st_lookup(RCLASS_IV_TBL(fc->track), (st_data_t)classpath, &n)) {
tmp = rb_str_dup((VALUE)n);
rb_str_cat2(tmp, "::");
rb_str_append(tmp, path);
path = tmp;
break;
}
tmp = rb_str_dup(rb_id2str(fc->name));
rb_str_cat2(tmp, "::");
rb_str_append(tmp, path);
path = tmp;
fc = fc->prev;
}
OBJ_FREEZE(path);
return path;
}
static enum rb_id_table_iterator_result
fc_i(ID key, VALUE v, void *a)
{
rb_const_entry_t *ce = (rb_const_entry_t *)v;
struct fc_result *res = a;
VALUE value = ce->value;
if (!rb_is_const_id(key)) return ID_TABLE_CONTINUE;
if (value == res->klass && (!res->preferred || key == res->preferred)) {
res->path = fc_path(res, key);
return ID_TABLE_STOP;
}
if (RB_TYPE_P(value, T_MODULE) || RB_TYPE_P(value, T_CLASS)) {
if (!RCLASS_CONST_TBL(value)) return ID_TABLE_CONTINUE;
else {
struct fc_result arg;
struct fc_result *list;
list = res;
while (list) {
if (list->track == value) return ID_TABLE_CONTINUE;
list = list->prev;
}
arg.name = key;
arg.preferred = res->preferred;
arg.path = 0;
arg.klass = res->klass;
arg.track = value;
arg.prev = res;
rb_id_table_foreach(RCLASS_CONST_TBL(value), fc_i, &arg);
if (arg.path) {
res->path = arg.path;
return ID_TABLE_STOP;
}
}
}
return ID_TABLE_CONTINUE;
}
/**
* Traverse constant namespace and find +classpath+ for _klass_. If
* _preferred_ is not 0, choice the path whose base name is set to it.
* If +classpath+ is found, the hidden instance variable __classpath__
* is set to the found path, and __tmp_classpath__ is removed.
* The path is frozen.
*/
static VALUE
find_class_path(VALUE klass, ID preferred)
{
struct fc_result arg;
arg.preferred = preferred;
arg.name = 0;
arg.path = 0;
arg.klass = klass;
arg.track = rb_cObject;
arg.prev = 0;
if (RCLASS_CONST_TBL(rb_cObject)) {
rb_id_table_foreach(RCLASS_CONST_TBL(rb_cObject), fc_i, &arg);
}
if (arg.path) {
st_data_t tmp = tmp_classpath;
if (!RCLASS_IV_TBL(klass)) {
RCLASS_IV_TBL(klass) = st_init_numtable();
}
rb_class_ivar_set(klass, classpath, arg.path);
st_delete(RCLASS_IV_TBL(klass), &tmp, 0);
return arg.path;
}
return Qnil;
}
/**
* Returns +classpath+ of _klass_, if it is named, or +nil+ for
* anonymous +class+/+module+. The last part of named +classpath+ is
* never anonymous, but anonymous +class+/+module+ names may be
* contained. If the path is "permanent", that means it has no
* anonymous names, <code>*permanent</code> is set to 1.
*/
static VALUE
classname(VALUE klass, int *permanent)
{
VALUE path = Qnil;
st_data_t n;
if (!klass) klass = rb_cObject;
*permanent = 1;
if (RCLASS_IV_TBL(klass)) {
if (!st_lookup(RCLASS_IV_TBL(klass), (st_data_t)classpath, &n)) {
ID cid = 0;
if (st_lookup(RCLASS_IV_TBL(klass), (st_data_t)classid, &n)) {
VALUE cname = (VALUE)n;
cid = rb_check_id(&cname);
if (cid) path = find_class_path(klass, cid);
}
if (NIL_P(path)) {
path = find_class_path(klass, (ID)0);
}
if (NIL_P(path)) {
if (!cid) {
return Qnil;
}
if (!st_lookup(RCLASS_IV_TBL(klass), (st_data_t)tmp_classpath, &n)) {
path = rb_id2str(cid);
return path;
}
*permanent = 0;
path = (VALUE)n;
return path;
}
}
else {
path = (VALUE)n;
}
if (!RB_TYPE_P(path, T_STRING)) {
rb_bug("class path is not set properly");
}
return path;
}
return find_class_path(klass, (ID)0);
}
/*
* call-seq:
* mod.name -> string
*
* Returns the name of the module <i>mod</i>. Returns nil for anonymous modules.
*/
VALUE
rb_mod_name(VALUE mod)
{
int permanent;
VALUE path = classname(mod, &permanent);
if (!NIL_P(path)) return rb_str_dup(path);
return path;
}
static VALUE
make_temporary_path(VALUE obj, VALUE klass)
{
VALUE path;
switch (klass) {
case Qnil:
path = rb_sprintf("#<Class:%p>", (void*)obj);
break;
case Qfalse:
path = rb_sprintf("#<Module:%p>", (void*)obj);
break;
default:
path = rb_sprintf("#<%"PRIsVALUE":%p>", klass, (void*)obj);
break;
}
OBJ_FREEZE(path);
return path;
}
typedef VALUE (*path_cache_func)(VALUE obj, VALUE name);
static VALUE
rb_tmp_class_path(VALUE klass, int *permanent, path_cache_func cache_path)
{
VALUE path = classname(klass, permanent);
st_data_t n = (st_data_t)path;
if (!NIL_P(path)) {
return path;
}
if (RCLASS_IV_TBL(klass) && st_lookup(RCLASS_IV_TBL(klass),
(st_data_t)tmp_classpath, &n)) {
*permanent = 0;
return (VALUE)n;
}
else {
if (RB_TYPE_P(klass, T_MODULE)) {
if (rb_obj_class(klass) == rb_cModule) {
path = Qfalse;
}
else {
int perm;
path = rb_tmp_class_path(RBASIC(klass)->klass, &perm, cache_path);
}
}
*permanent = 0;
return cache_path(klass, path);
}
}
static VALUE
ivar_cache(VALUE obj, VALUE name)
{
return rb_ivar_set(obj, tmp_classpath, make_temporary_path(obj, name));
}
VALUE
rb_class_path(VALUE klass)
{
int permanent;
VALUE path = rb_tmp_class_path(klass, &permanent, ivar_cache);
if (!NIL_P(path)) path = rb_str_dup(path);
return path;
}
static VALUE
null_cache(VALUE obj, VALUE name)
{
return make_temporary_path(obj, name);
}
VALUE
rb_class_path_no_cache(VALUE klass)
{
int permanent;
VALUE path = rb_tmp_class_path(klass, &permanent, null_cache);
if (!NIL_P(path)) path = rb_str_dup(path);
return path;
}
VALUE
rb_class_path_cached(VALUE klass)
{
st_table *ivtbl = RCLASS_IV_TBL(klass);
st_data_t n;
if (!ivtbl) return Qnil;
if (st_lookup(ivtbl, (st_data_t)classpath, &n)) return (VALUE)n;
if (st_lookup(ivtbl, (st_data_t)tmp_classpath, &n)) return (VALUE)n;
return Qnil;
}
static VALUE
never_cache(VALUE obj, VALUE name)
{
return name;
}
VALUE
rb_search_class_path(VALUE klass)
{
int permanent;
return rb_tmp_class_path(klass, &permanent, never_cache);
}
void
rb_set_class_path_string(VALUE klass, VALUE under, VALUE name)
{
VALUE str;
ID pathid = classpath;
if (under == rb_cObject) {
str = rb_str_new_frozen(name);
}
else {
int permanent;
str = rb_str_dup(rb_tmp_class_path(under, &permanent, ivar_cache));
rb_str_cat2(str, "::");
rb_str_append(str, name);
OBJ_FREEZE(str);
if (!permanent) {
pathid = tmp_classpath;
rb_ivar_set(klass, classid, rb_str_intern(name));
}
}
rb_ivar_set(klass, pathid, str);
}
void
rb_set_class_path(VALUE klass, VALUE under, const char *name)
{
VALUE str;
ID pathid = classpath;
if (under == rb_cObject) {
str = rb_str_new2(name);
}
else {
int permanent;
str = rb_str_dup(rb_tmp_class_path(under, &permanent, ivar_cache));
rb_str_cat2(str, "::");
rb_str_cat2(str, name);
if (!permanent) {
pathid = tmp_classpath;
rb_ivar_set(klass, classid, rb_str_intern(rb_str_new_cstr(name)));
}
}
OBJ_FREEZE(str);
rb_ivar_set(klass, pathid, str);
}
VALUE
rb_path_to_class(VALUE pathname)
{
rb_encoding *enc = rb_enc_get(pathname);
const char *pbeg, *p, *path = RSTRING_PTR(pathname);
ID id;
VALUE c = rb_cObject;
if (!rb_enc_asciicompat(enc)) {
rb_raise(rb_eArgError, "invalid class path encoding (non ASCII)");
}
pbeg = p = path;
if (path[0] == '#') {
rb_raise(rb_eArgError, "can't retrieve anonymous class %"PRIsVALUE,
QUOTE(pathname));
}
while (*p) {
while (*p && *p != ':') p++;
id = rb_check_id_cstr(pbeg, p-pbeg, enc);
if (p[0] == ':') {
if (p[1] != ':') goto undefined_class;
p += 2;
pbeg = p;
}
if (!id || !rb_const_defined_at(c, id)) {
undefined_class:
rb_raise(rb_eArgError, "undefined class/module % "PRIsVALUE,
rb_str_subseq(pathname, 0, p-path));
}
c = rb_const_get_at(c, id);
if (!RB_TYPE_P(c, T_MODULE) && !RB_TYPE_P(c, T_CLASS)) {
rb_raise(rb_eTypeError, "%"PRIsVALUE" does not refer to class/module",
pathname);
}
}
RB_GC_GUARD(pathname);
return c;
}
VALUE
rb_path2class(const char *path)
{
return rb_path_to_class(rb_str_new_cstr(path));
}
void
rb_name_class(VALUE klass, ID id)
{
rb_ivar_set(klass, classid, ID2SYM(id));
}
VALUE
rb_class_name(VALUE klass)
{
return rb_class_path(rb_class_real(klass));
}
const char *
rb_class2name(VALUE klass)
{
int permanent;
VALUE path = rb_tmp_class_path(rb_class_real(klass), &permanent, ivar_cache);
if (NIL_P(path)) return NULL;
return RSTRING_PTR(path);
}
const char *
rb_obj_classname(VALUE obj)
{
return rb_class2name(CLASS_OF(obj));
}
struct trace_var {
int removed;
void (*func)(VALUE arg, VALUE val);
VALUE data;
struct trace_var *next;
};
struct rb_global_variable {
int counter;
int block_trace;
void *data;
rb_gvar_getter_t *getter;
rb_gvar_setter_t *setter;
rb_gvar_marker_t *marker;
struct trace_var *trace;
};
struct rb_global_entry*
rb_global_entry(ID id)
{
struct rb_global_entry *entry;
VALUE data;
if (!rb_id_table_lookup(rb_global_tbl, id, &data)) {
struct rb_global_variable *var;
entry = ALLOC(struct rb_global_entry);
var = ALLOC(struct rb_global_variable);
entry->id = id;
entry->var = var;
var->counter = 1;
var->data = 0;
var->getter = rb_gvar_undef_getter;
var->setter = rb_gvar_undef_setter;
var->marker = rb_gvar_undef_marker;
var->block_trace = 0;
var->trace = 0;
rb_id_table_insert(rb_global_tbl, id, (VALUE)entry);
}
else {
entry = (struct rb_global_entry *)data;
}
return entry;
}
VALUE
rb_gvar_undef_getter(ID id, void *data, struct rb_global_variable *var)
{
rb_warning("global variable `%"PRIsVALUE"' not initialized", QUOTE_ID(id));
return Qnil;
}
void
rb_gvar_undef_setter(VALUE val, ID id, void *d, struct rb_global_variable *var)
{
var->getter = rb_gvar_val_getter;
var->setter = rb_gvar_val_setter;
var->marker = rb_gvar_val_marker;
var->data = (void*)val;
}
void
rb_gvar_undef_marker(VALUE *var)
{
}
VALUE
rb_gvar_val_getter(ID id, void *data, struct rb_global_variable *var)
{
return (VALUE)data;
}
void
rb_gvar_val_setter(VALUE val, ID id, void *data, struct rb_global_variable *var)
{
var->data = (void*)val;
}
void
rb_gvar_val_marker(VALUE *var)
{
VALUE data = (VALUE)var;
if (data) rb_gc_mark_maybe(data);
}
VALUE
rb_gvar_var_getter(ID id, void *data, struct rb_global_variable *gvar)
{
VALUE *var = data;
if (!var) return Qnil;
return *var;
}
void
rb_gvar_var_setter(VALUE val, ID id, void *data, struct rb_global_variable *g)
{
*(VALUE *)data = val;
}
void
rb_gvar_var_marker(VALUE *var)
{
if (var) rb_gc_mark_maybe(*var);
}
void
rb_gvar_readonly_setter(VALUE v, ID id, void *d, struct rb_global_variable *g)
{
rb_name_error(id, "%"PRIsVALUE" is a read-only variable", QUOTE_ID(id));
}
static enum rb_id_table_iterator_result
mark_global_entry(VALUE v, void *ignored)
{
struct rb_global_entry *entry = (struct rb_global_entry *)v;
struct trace_var *trace;
struct rb_global_variable *var = entry->var;
(*var->marker)(var->data);
trace = var->trace;
while (trace) {
if (trace->data) rb_gc_mark_maybe(trace->data);
trace = trace->next;
}
return ID_TABLE_CONTINUE;
}
void
rb_gc_mark_global_tbl(void)
{
if (rb_global_tbl)
rb_id_table_foreach_values(rb_global_tbl, mark_global_entry, 0);
}
static ID
global_id(const char *name)
{
ID id;
if (name[0] == '$') id = rb_intern(name);
else {
size_t len = strlen(name);
char *buf = ALLOCA_N(char, len+1);
buf[0] = '$';
memcpy(buf+1, name, len);
id = rb_intern2(buf, len+1);
}
return id;
}
void
rb_define_hooked_variable(
const char *name,
VALUE *var,
VALUE (*getter)(ANYARGS),
void (*setter)(ANYARGS))
{
volatile VALUE tmp = var ? *var : Qnil;
ID id = global_id(name);
struct rb_global_variable *gvar = rb_global_entry(id)->var;
gvar->data = (void*)var;
gvar->getter = getter ? (rb_gvar_getter_t *)getter : rb_gvar_var_getter;
gvar->setter = setter ? (rb_gvar_setter_t *)setter : rb_gvar_var_setter;
gvar->marker = rb_gvar_var_marker;
RB_GC_GUARD(tmp);
}
void
rb_define_variable(const char *name, VALUE *var)
{
rb_define_hooked_variable(name, var, 0, 0);
}
void
rb_define_readonly_variable(const char *name, const VALUE *var)
{
rb_define_hooked_variable(name, (VALUE *)var, 0, rb_gvar_readonly_setter);
}
void
rb_define_virtual_variable(
const char *name,
VALUE (*getter)(ANYARGS),
void (*setter)(ANYARGS))
{
if (!getter) getter = rb_gvar_val_getter;
if (!setter) setter = rb_gvar_readonly_setter;
rb_define_hooked_variable(name, 0, getter, setter);
}
static void
rb_trace_eval(VALUE cmd, VALUE val)
{
rb_eval_cmd(cmd, rb_ary_new3(1, val), 0);
}
/*
* call-seq:
* trace_var(symbol, cmd ) -> nil
* trace_var(symbol) {|val| block } -> nil
*
* Controls tracing of assignments to global variables. The parameter
* +symbol+ identifies the variable (as either a string name or a
* symbol identifier). _cmd_ (which may be a string or a
* +Proc+ object) or block is executed whenever the variable
* is assigned. The block or +Proc+ object receives the
* variable's new value as a parameter. Also see
* <code>Kernel::untrace_var</code>.
*
* trace_var :$_, proc {|v| puts "$_ is now '#{v}'" }
* $_ = "hello"
* $_ = ' there'
*
* <em>produces:</em>
*
* $_ is now 'hello'
* $_ is now ' there'
*/
VALUE
rb_f_trace_var(int argc, const VALUE *argv)
{
VALUE var, cmd;
struct rb_global_entry *entry;
struct trace_var *trace;
if (rb_scan_args(argc, argv, "11", &var, &cmd) == 1) {
cmd = rb_block_proc();
}
if (NIL_P(cmd)) {
return rb_f_untrace_var(argc, argv);
}
entry = rb_global_entry(rb_to_id(var));
if (OBJ_TAINTED(cmd)) {
rb_raise(rb_eSecurityError, "Insecure: tainted variable trace");
}
trace = ALLOC(struct trace_var);
trace->next = entry->var->trace;
trace->func = rb_trace_eval;
trace->data = cmd;
trace->removed = 0;
entry->var->trace = trace;
return Qnil;
}
static void
remove_trace(struct rb_global_variable *var)
{
struct trace_var *trace = var->trace;
struct trace_var t;
struct trace_var *next;
t.next = trace;
trace = &t;
while (trace->next) {
next = trace->next;
if (next->removed) {
trace->next = next->next;
xfree(next);
}
else {
trace = next;
}
}
var->trace = t.next;
}
/*
* call-seq:
* untrace_var(symbol [, cmd] ) -> array or nil
*
* Removes tracing for the specified command on the given global
* variable and returns +nil+. If no command is specified,
* removes all tracing for that variable and returns an array
* containing the commands actually removed.
*/
VALUE
rb_f_untrace_var(int argc, const VALUE *argv)
{
VALUE var, cmd;
ID id;
struct rb_global_entry *entry;
struct trace_var *trace;
VALUE data;
rb_scan_args(argc, argv, "11", &var, &cmd);
id = rb_check_id(&var);
if (!id) {
rb_name_error_str(var, "undefined global variable %"PRIsVALUE"", QUOTE(var));
}
if (!rb_id_table_lookup(rb_global_tbl, id, &data)) {
rb_name_error(id, "undefined global variable %"PRIsVALUE"", QUOTE_ID(id));
}
trace = (entry = (struct rb_global_entry *)data)->var->trace;
if (NIL_P(cmd)) {
VALUE ary = rb_ary_new();
while (trace) {
struct trace_var *next = trace->next;
rb_ary_push(ary, (VALUE)trace->data);
trace->removed = 1;
trace = next;
}
if (!entry->var->block_trace) remove_trace(entry->var);
return ary;
}
else {
while (trace) {
if (trace->data == cmd) {
trace->removed = 1;
if (!entry->var->block_trace) remove_trace(entry->var);
return rb_ary_new3(1, cmd);
}
trace = trace->next;
}
}
return Qnil;
}
VALUE
rb_gvar_get(struct rb_global_entry *entry)
{
struct rb_global_variable *var = entry->var;
return (*var->getter)(entry->id, var->data, var);
}
struct trace_data {
struct trace_var *trace;
VALUE val;
};
static VALUE
trace_ev(struct trace_data *data)
{
struct trace_var *trace = data->trace;
while (trace) {
(*trace->func)(trace->data, data->val);
trace = trace->next;
}
return Qnil;
}
static VALUE
trace_en(struct rb_global_variable *var)
{
var->block_trace = 0;
remove_trace(var);
return Qnil; /* not reached */
}
VALUE
rb_gvar_set(struct rb_global_entry *entry, VALUE val)
{
struct trace_data trace;
struct rb_global_variable *var = entry->var;
(*var->setter)(val, entry->id, var->data, var);
if (var->trace && !var->block_trace) {
var->block_trace = 1;
trace.trace = var->trace;
trace.val = val;
rb_ensure(trace_ev, (VALUE)&trace, trace_en, (VALUE)var);
}
return val;
}
VALUE
rb_gv_set(const char *name, VALUE val)
{
struct rb_global_entry *entry;
entry = rb_global_entry(global_id(name));
return rb_gvar_set(entry, val);
}
VALUE
rb_gv_get(const char *name)
{
struct rb_global_entry *entry;
entry = rb_global_entry(global_id(name));
return rb_gvar_get(entry);
}
VALUE
rb_gvar_defined(struct rb_global_entry *entry)
{
if (entry->var->getter == rb_gvar_undef_getter) return Qfalse;
return Qtrue;
}
static enum rb_id_table_iterator_result
gvar_i(ID key, VALUE val, void *a)
{
VALUE ary = (VALUE)a;
rb_ary_push(ary, ID2SYM(key));
return ID_TABLE_CONTINUE;
}
/*
* call-seq:
* global_variables -> array
*
* Returns an array of the names of global variables.
*
* global_variables.grep /std/ #=> [:$stdin, :$stdout, :$stderr]
*/
VALUE
rb_f_global_variables(void)
{
VALUE ary = rb_ary_new();
VALUE sym, backref = rb_backref_get();
rb_id_table_foreach(rb_global_tbl, gvar_i, (void *)ary);
if (!NIL_P(backref)) {
char buf[2];
int i, nmatch = rb_match_count(backref);
buf[0] = '$';
for (i = 1; i <= nmatch; ++i) {
if (!rb_match_nth_defined(i, backref)) continue;
if (i < 10) {
/* probably reused, make static ID */
buf[1] = (char)(i + '0');
sym = ID2SYM(rb_intern2(buf, 2));
}
else {
/* dynamic symbol */
sym = rb_str_intern(rb_sprintf("$%d", i));
}
rb_ary_push(ary, sym);
}
}
return ary;
}
void
rb_alias_variable(ID name1, ID name2)
{
struct rb_global_entry *entry1, *entry2;
VALUE data1;
entry2 = rb_global_entry(name2);
if (!rb_id_table_lookup(rb_global_tbl, name1, &data1)) {
entry1 = ALLOC(struct rb_global_entry);
entry1->id = name1;
rb_id_table_insert(rb_global_tbl, name1, (VALUE)entry1);
}
else if ((entry1 = (struct rb_global_entry *)data1)->var != entry2->var) {
struct rb_global_variable *var = entry1->var;
if (var->block_trace) {
rb_raise(rb_eRuntimeError, "can't alias in tracer");
}
var->counter--;
if (var->counter == 0) {
struct trace_var *trace = var->trace;
while (trace) {
struct trace_var *next = trace->next;
xfree(trace);
trace = next;
}
xfree(var);
}
}
else {
return;
}
entry2->var->counter++;
entry1->var = entry2->var;
}
struct gen_ivar_compat_tbl {
struct gen_ivtbl *ivtbl;
st_table *tbl;
};
static int
gen_ivar_compat_tbl_i(st_data_t id, st_data_t index, st_data_t arg)
{
struct gen_ivar_compat_tbl *a = (struct gen_ivar_compat_tbl *)arg;
if ((long)index < a->ivtbl->numiv) {
VALUE val = a->ivtbl->ivptr[index];
if (val != Qundef) {
st_add_direct(a->tbl, id, (st_data_t)val);
}
}
return ST_CONTINUE;
}
static int
gen_ivtbl_get(VALUE obj, struct gen_ivtbl **ivtbl)
{
st_data_t data;
if (st_lookup(generic_iv_tbl, (st_data_t)obj, &data)) {
*ivtbl = (struct gen_ivtbl *)data;
return 1;
}
return 0;
}
/* for backwards compatibility only */
st_table*
rb_generic_ivar_table(VALUE obj)
{
st_table *iv_index_tbl = RCLASS_IV_INDEX_TBL(rb_obj_class(obj));
struct gen_ivar_compat_tbl a;
st_data_t d;
if (!iv_index_tbl) return 0;
if (!FL_TEST(obj, FL_EXIVAR)) return 0;
if (!gen_ivtbl_get(obj, &a.ivtbl)) return 0;
a.tbl = 0;
if (!generic_iv_tbl_compat) {
generic_iv_tbl_compat = st_init_numtable();
}
else {
if (st_lookup(generic_iv_tbl_compat, (st_data_t)obj, &d)) {
a.tbl = (st_table *)d;
st_clear(a.tbl);
}
}
if (!a.tbl) {
a.tbl = st_init_numtable();
d = (st_data_t)a.tbl;
st_add_direct(generic_iv_tbl_compat, (st_data_t)obj, d);
}
st_foreach_safe(iv_index_tbl, gen_ivar_compat_tbl_i, (st_data_t)&a);
return a.tbl;
}
static VALUE
generic_ivar_delete(VALUE obj, ID id, VALUE undef)
{
struct gen_ivtbl *ivtbl;
if (gen_ivtbl_get(obj, &ivtbl)) {
st_table *iv_index_tbl = RCLASS_IV_INDEX_TBL(rb_obj_class(obj));
st_data_t index;
if (st_lookup(iv_index_tbl, (st_data_t)id, &index)) {
if ((long)index < ivtbl->numiv) {
VALUE ret = ivtbl->ivptr[index];
ivtbl->ivptr[index] = Qundef;
return ret == Qundef ? undef : ret;
}
}
}
return undef;
}
static VALUE
generic_ivar_get(VALUE obj, ID id, VALUE undef)
{
struct gen_ivtbl *ivtbl;
if (gen_ivtbl_get(obj, &ivtbl)) {
st_table *iv_index_tbl = RCLASS_IV_INDEX_TBL(rb_obj_class(obj));
st_data_t index;
if (st_lookup(iv_index_tbl, (st_data_t)id, &index)) {
if ((long)index < ivtbl->numiv) {
VALUE ret = ivtbl->ivptr[index];
return ret == Qundef ? undef : ret;
}
}
}
return undef;
}
static size_t
gen_ivtbl_bytes(size_t n)
{
return sizeof(struct gen_ivtbl) + n * sizeof(VALUE) - sizeof(VALUE);
}
static struct gen_ivtbl *
gen_ivtbl_resize(struct gen_ivtbl *old, long n)
{
long len = old ? old->numiv : 0;
struct gen_ivtbl *ivtbl = xrealloc(old, gen_ivtbl_bytes(n));
ivtbl->numiv = n;
for (; len < n; len++) {
ivtbl->ivptr[len] = Qundef;
}
return ivtbl;
}
#if 0
static struct gen_ivtbl *
gen_ivtbl_dup(const struct gen_ivtbl *orig)
{
size_t s = gen_ivtbl_bytes(orig->numiv);
struct gen_ivtbl *ivtbl = xmalloc(s);
memcpy(ivtbl, orig, s);
return ivtbl;
}
#endif
static long
iv_index_tbl_newsize(struct ivar_update *ivup)
{
long newsize = (ivup->index+1) + (ivup->index+1)/4; /* (index+1)*1.25 */
if (!ivup->iv_extended &&
ivup->u.iv_index_tbl->num_entries < (st_index_t)newsize) {
newsize = ivup->u.iv_index_tbl->num_entries;
}
return newsize;
}
static int
generic_ivar_update(st_data_t *k, st_data_t *v, st_data_t u, int existing)
{
VALUE obj = (VALUE)*k;
struct ivar_update *ivup = (struct ivar_update *)u;
long newsize;
int ret = ST_CONTINUE;
struct gen_ivtbl *ivtbl;
if (existing) {
ivtbl = (struct gen_ivtbl *)*v;
if ((long)ivup->index >= ivtbl->numiv) {
goto resize;
}
ret = ST_STOP;
}
else {
FL_SET(obj, FL_EXIVAR);
ivtbl = 0;
resize:
newsize = iv_index_tbl_newsize(ivup);
ivtbl = gen_ivtbl_resize(ivtbl, newsize);
*v = (st_data_t)ivtbl;
}
ivup->u.ivtbl = ivtbl;
return ret;
}
static VALUE
generic_ivar_defined(VALUE obj, ID id)
{
struct gen_ivtbl *ivtbl;
st_table *iv_index_tbl = RCLASS_IV_INDEX_TBL(rb_obj_class(obj));
st_data_t index;
if (!iv_index_tbl) return Qfalse;
if (!st_lookup(iv_index_tbl, (st_data_t)id, &index)) return Qfalse;
if (!gen_ivtbl_get(obj, &ivtbl)) return Qfalse;
if (((long)index < ivtbl->numiv) && (ivtbl->ivptr[index] != Qundef))
return Qtrue;
return Qfalse;
}
static int
generic_ivar_remove(VALUE obj, ID id, VALUE *valp)
{
struct gen_ivtbl *ivtbl;
st_data_t key = (st_data_t)id;
st_data_t index;
st_table *iv_index_tbl = RCLASS_IV_INDEX_TBL(rb_obj_class(obj));
if (!iv_index_tbl) return 0;
if (!st_lookup(iv_index_tbl, key, &index)) return 0;
if (!gen_ivtbl_get(obj, &ivtbl)) return 0;
if ((long)index < ivtbl->numiv) {
if (ivtbl->ivptr[index] != Qundef) {
*valp = ivtbl->ivptr[index];
ivtbl->ivptr[index] = Qundef;
return 1;
}
}
return 0;
}
static void
gen_ivtbl_mark(const struct gen_ivtbl *ivtbl)
{
long i;
for (i = 0; i < ivtbl->numiv; i++) {
rb_gc_mark(ivtbl->ivptr[i]);
}
}
void
rb_mark_generic_ivar(VALUE obj)
{
struct gen_ivtbl *ivtbl;
if (gen_ivtbl_get(obj, &ivtbl)) {
gen_ivtbl_mark(ivtbl);
}
}
void
rb_free_generic_ivar(VALUE obj)
{
st_data_t key = (st_data_t)obj;
struct gen_ivtbl *ivtbl;
if (st_delete(generic_iv_tbl, &key, (st_data_t *)&ivtbl))
xfree(ivtbl);
if (generic_iv_tbl_compat) {
st_table *tbl;
if (st_delete(generic_iv_tbl_compat, &key, (st_data_t *)&tbl))
st_free_table(tbl);
}
}
RUBY_FUNC_EXPORTED size_t
rb_generic_ivar_memsize(VALUE obj)
{
struct gen_ivtbl *ivtbl;
if (gen_ivtbl_get(obj, &ivtbl))
return gen_ivtbl_bytes(ivtbl->numiv);
return 0;
}
static size_t
gen_ivtbl_count(const struct gen_ivtbl *ivtbl)
{
long i;
size_t n = 0;
for (i = 0; i < ivtbl->numiv; i++) {
if (ivtbl->ivptr[i] != Qundef) {
n++;
}
}
return n;
}
VALUE
rb_ivar_lookup(VALUE obj, ID id, VALUE undef)
{
VALUE val, *ptr;
struct st_table *iv_index_tbl;
long len;
st_data_t index;
if (SPECIAL_CONST_P(obj)) return undef;
switch (BUILTIN_TYPE(obj)) {
case T_OBJECT:
len = ROBJECT_NUMIV(obj);
ptr = ROBJECT_IVPTR(obj);
iv_index_tbl = ROBJECT_IV_INDEX_TBL(obj);
if (!iv_index_tbl) break;
if (!st_lookup(iv_index_tbl, (st_data_t)id, &index)) break;
if (len <= (long)index) break;
val = ptr[index];
if (val != Qundef)
return val;
break;
case T_CLASS:
case T_MODULE:
if (RCLASS_IV_TBL(obj) &&
st_lookup(RCLASS_IV_TBL(obj), (st_data_t)id, &index))
return (VALUE)index;
break;
default:
if (FL_TEST(obj, FL_EXIVAR))
return generic_ivar_get(obj, id, undef);
break;
}
return undef;
}
VALUE
rb_ivar_get(VALUE obj, ID id)
{
VALUE iv = rb_ivar_lookup(obj, id, Qundef);
if (iv == Qundef) {
if (RTEST(ruby_verbose))
rb_warning("instance variable %"PRIsVALUE" not initialized", QUOTE_ID(id));
iv = Qnil;
}
return iv;
}
VALUE
rb_attr_get(VALUE obj, ID id)
{
return rb_ivar_lookup(obj, id, Qnil);
}
static VALUE
rb_ivar_delete(VALUE obj, ID id, VALUE undef)
{
VALUE val, *ptr;
struct st_table *iv_index_tbl;
long len;
st_data_t index;
rb_check_frozen(obj);
switch (BUILTIN_TYPE(obj)) {
case T_OBJECT:
len = ROBJECT_NUMIV(obj);
ptr = ROBJECT_IVPTR(obj);
iv_index_tbl = ROBJECT_IV_INDEX_TBL(obj);
if (!iv_index_tbl) break;
if (!st_lookup(iv_index_tbl, (st_data_t)id, &index)) break;
if (len <= (long)index) break;
val = ptr[index];
ptr[index] = Qundef;
if (val != Qundef)
return val;
break;
case T_CLASS:
case T_MODULE:
if (RCLASS_IV_TBL(obj) &&
st_delete(RCLASS_IV_TBL(obj), (st_data_t *)&id, &index))
return (VALUE)index;
break;
default:
if (FL_TEST(obj, FL_EXIVAR))
return generic_ivar_delete(obj, id, undef);
break;
}
return undef;
}
VALUE
rb_attr_delete(VALUE obj, ID id)
{
return rb_ivar_delete(obj, id, Qnil);
}
static st_table *
iv_index_tbl_make(VALUE obj)
{
VALUE klass = rb_obj_class(obj);
st_table *iv_index_tbl = RCLASS_IV_INDEX_TBL(klass);
if (!iv_index_tbl) {
iv_index_tbl = RCLASS_IV_INDEX_TBL(klass) = st_init_numtable();
}
return iv_index_tbl;
}
static void
iv_index_tbl_extend(struct ivar_update *ivup, ID id)
{
if (st_lookup(ivup->u.iv_index_tbl, (st_data_t)id, &ivup->index)) {
return;
}
if (ivup->u.iv_index_tbl->num_entries >= INT_MAX) {
rb_raise(rb_eArgError, "too many instance variables");
}
ivup->index = (st_data_t)ivup->u.iv_index_tbl->num_entries;
st_add_direct(ivup->u.iv_index_tbl, (st_data_t)id, ivup->index);
ivup->iv_extended = 1;
}
static void
generic_ivar_set(VALUE obj, ID id, VALUE val)
{
struct ivar_update ivup;
ivup.iv_extended = 0;
ivup.u.iv_index_tbl = iv_index_tbl_make(obj);
iv_index_tbl_extend(&ivup, id);
st_update(generic_iv_tbl, (st_data_t)obj, generic_ivar_update,
(st_data_t)&ivup);
ivup.u.ivtbl->ivptr[ivup.index] = val;
RB_OBJ_WRITTEN(obj, Qundef, val);
}
VALUE
rb_ivar_set(VALUE obj, ID id, VALUE val)
{
struct ivar_update ivup;
long i, len;
rb_check_frozen(obj);
switch (BUILTIN_TYPE(obj)) {
case T_OBJECT:
ivup.iv_extended = 0;
ivup.u.iv_index_tbl = iv_index_tbl_make(obj);
iv_index_tbl_extend(&ivup, id);
len = ROBJECT_NUMIV(obj);
if (len <= (long)ivup.index) {
VALUE *ptr = ROBJECT_IVPTR(obj);
if (ivup.index < ROBJECT_EMBED_LEN_MAX) {
RBASIC(obj)->flags |= ROBJECT_EMBED;
ptr = ROBJECT(obj)->as.ary;
for (i = 0; i < ROBJECT_EMBED_LEN_MAX; i++) {
ptr[i] = Qundef;
}
}
else {
VALUE *newptr;
long newsize = iv_index_tbl_newsize(&ivup);
if (RBASIC(obj)->flags & ROBJECT_EMBED) {
newptr = ALLOC_N(VALUE, newsize);
MEMCPY(newptr, ptr, VALUE, len);
RBASIC(obj)->flags &= ~ROBJECT_EMBED;
ROBJECT(obj)->as.heap.ivptr = newptr;
}
else {
REALLOC_N(ROBJECT(obj)->as.heap.ivptr, VALUE, newsize);
newptr = ROBJECT(obj)->as.heap.ivptr;
}
for (; len < newsize; len++)
newptr[len] = Qundef;
ROBJECT(obj)->as.heap.numiv = newsize;
ROBJECT(obj)->as.heap.iv_index_tbl = ivup.u.iv_index_tbl;
}
}
RB_OBJ_WRITE(obj, &ROBJECT_IVPTR(obj)[ivup.index], val);
break;
case T_CLASS:
case T_MODULE:
if (!RCLASS_IV_TBL(obj)) RCLASS_IV_TBL(obj) = st_init_numtable();
rb_class_ivar_set(obj, id, val);
break;
default:
generic_ivar_set(obj, id, val);
break;
}
return val;
}
VALUE
rb_ivar_defined(VALUE obj, ID id)
{
VALUE val;
struct st_table *iv_index_tbl;
st_data_t index;
if (SPECIAL_CONST_P(obj)) return Qfalse;
switch (BUILTIN_TYPE(obj)) {
case T_OBJECT:
iv_index_tbl = ROBJECT_IV_INDEX_TBL(obj);
if (!iv_index_tbl) break;
if (!st_lookup(iv_index_tbl, (st_data_t)id, &index)) break;
if (ROBJECT_NUMIV(obj) <= (long)index) break;
val = ROBJECT_IVPTR(obj)[index];
if (val != Qundef)
return Qtrue;
break;
case T_CLASS:
case T_MODULE:
if (RCLASS_IV_TBL(obj) && st_lookup(RCLASS_IV_TBL(obj), (st_data_t)id, 0))
return Qtrue;
break;
default:
if (FL_TEST(obj, FL_EXIVAR))
return generic_ivar_defined(obj, id);
break;
}
return Qfalse;
}
struct obj_ivar_tag {
VALUE obj;
int (*func)(ID key, VALUE val, st_data_t arg);
st_data_t arg;
};
static int
obj_ivar_i(st_data_t key, st_data_t index, st_data_t arg)
{
struct obj_ivar_tag *data = (struct obj_ivar_tag *)arg;
if ((long)index < ROBJECT_NUMIV(data->obj)) {
VALUE val = ROBJECT_IVPTR(data->obj)[(long)index];
if (val != Qundef) {
return (data->func)((ID)key, val, data->arg);
}
}
return ST_CONTINUE;
}
static void
obj_ivar_each(VALUE obj, int (*func)(ANYARGS), st_data_t arg)
{
st_table *tbl;
struct obj_ivar_tag data;
tbl = ROBJECT_IV_INDEX_TBL(obj);
if (!tbl)
return;
data.obj = obj;
data.func = (int (*)(ID key, VALUE val, st_data_t arg))func;
data.arg = arg;
st_foreach_safe(tbl, obj_ivar_i, (st_data_t)&data);
}
struct gen_ivar_tag {
struct gen_ivtbl *ivtbl;
int (*func)(ID key, VALUE val, st_data_t arg);
st_data_t arg;
};
static int
gen_ivar_each_i(st_data_t key, st_data_t index, st_data_t data)
{
struct gen_ivar_tag *arg = (struct gen_ivar_tag *)data;
if ((long)index < arg->ivtbl->numiv) {
VALUE val = arg->ivtbl->ivptr[index];
if (val != Qundef) {
return (arg->func)((ID)key, val, arg->arg);
}
}
return ST_CONTINUE;
}
static void
gen_ivar_each(VALUE obj, int (*func)(ANYARGS), st_data_t arg)
{
struct gen_ivar_tag data;
st_table *iv_index_tbl = RCLASS_IV_INDEX_TBL(rb_obj_class(obj));
if (!iv_index_tbl) return;
if (!gen_ivtbl_get(obj, &data.ivtbl)) return;
data.func = (int (*)(ID key, VALUE val, st_data_t arg))func;
data.arg = arg;
st_foreach_safe(iv_index_tbl, gen_ivar_each_i, (st_data_t)&data);
}
struct givar_copy {
VALUE obj;
st_table *iv_index_tbl;
struct gen_ivtbl *ivtbl;
};
static int
gen_ivar_copy(ID id, VALUE val, st_data_t arg)
{
struct givar_copy *c = (struct givar_copy *)arg;
struct ivar_update ivup;
ivup.iv_extended = 0;
ivup.u.iv_index_tbl = c->iv_index_tbl;
iv_index_tbl_extend(&ivup, id);
if ((long)ivup.index >= c->ivtbl->numiv) {
size_t newsize = iv_index_tbl_newsize(&ivup);
c->ivtbl = gen_ivtbl_resize(c->ivtbl, newsize);
}
c->ivtbl->ivptr[ivup.index] = val;
RB_OBJ_WRITTEN(c->obj, Qundef, val);
return ST_CONTINUE;
}
void
rb_copy_generic_ivar(VALUE clone, VALUE obj)
{
struct gen_ivtbl *ivtbl;
rb_check_frozen(clone);
if (!FL_TEST(obj, FL_EXIVAR)) {
clear:
if (FL_TEST(clone, FL_EXIVAR)) {
rb_free_generic_ivar(clone);
FL_UNSET(clone, FL_EXIVAR);
}
return;
}
if (gen_ivtbl_get(obj, &ivtbl)) {
struct givar_copy c;
long i;
if (gen_ivtbl_count(ivtbl) == 0)
goto clear;
if (gen_ivtbl_get(clone, &c.ivtbl)) {
for (i = 0; i < c.ivtbl->numiv; i++)
c.ivtbl->ivptr[i] = Qundef;
}
else {
c.ivtbl = gen_ivtbl_resize(0, ivtbl->numiv);
FL_SET(clone, FL_EXIVAR);
}
c.iv_index_tbl = iv_index_tbl_make(clone);
c.obj = clone;
gen_ivar_each(obj, gen_ivar_copy, (st_data_t)&c);
/*
* c.ivtbl may change in gen_ivar_copy due to realloc,
* no need to free
*/
st_insert(generic_iv_tbl, (st_data_t)clone, (st_data_t)c.ivtbl);
}
}
void
rb_ivar_foreach(VALUE obj, int (*func)(ANYARGS), st_data_t arg)
{
if (SPECIAL_CONST_P(obj)) return;
switch (BUILTIN_TYPE(obj)) {
case T_OBJECT:
obj_ivar_each(obj, func, arg);
break;
case T_CLASS:
case T_MODULE:
if (RCLASS_IV_TBL(obj)) {
st_foreach_safe(RCLASS_IV_TBL(obj), func, arg);
}
break;
default:
if (FL_TEST(obj, FL_EXIVAR)) {
gen_ivar_each(obj, func, arg);
}
break;
}
}
st_index_t
rb_ivar_count(VALUE obj)
{
st_table *tbl;
if (SPECIAL_CONST_P(obj)) return 0;
switch (BUILTIN_TYPE(obj)) {
case T_OBJECT:
if ((tbl = ROBJECT_IV_INDEX_TBL(obj)) != 0) {
st_index_t i, count, num = tbl->num_entries;
const VALUE *const ivptr = ROBJECT_IVPTR(obj);
for (i = count = 0; i < num; ++i) {
if (ivptr[i] != Qundef) {
count++;
}
}
return count;
}
break;
case T_CLASS:
case T_MODULE:
if ((tbl = RCLASS_IV_TBL(obj)) != 0) {
return tbl->num_entries;
}
break;
default:
if (FL_TEST(obj, FL_EXIVAR)) {
struct gen_ivtbl *ivtbl;
if (gen_ivtbl_get(obj, &ivtbl)) {
return gen_ivtbl_count(ivtbl);
}
}
break;
}
return 0;
}
static int
ivar_i(st_data_t k, st_data_t v, st_data_t a)
{
ID key = (ID)k;
VALUE ary = (VALUE)a;
if (rb_is_instance_id(key)) {
rb_ary_push(ary, ID2SYM(key));
}
return ST_CONTINUE;
}
/*
* call-seq:
* obj.instance_variables -> array
*
* Returns an array of instance variable names for the receiver. Note
* that simply defining an accessor does not create the corresponding
* instance variable.
*
* class Fred
* attr_accessor :a1
* def initialize
* @iv = 3
* end
* end
* Fred.new.instance_variables #=> [:@iv]
*/
VALUE
rb_obj_instance_variables(VALUE obj)
{
VALUE ary;
ary = rb_ary_new();
rb_ivar_foreach(obj, ivar_i, ary);
return ary;
}
#define rb_is_constant_id rb_is_const_id
#define rb_is_constant_name rb_is_const_name
#define id_for_var(obj, name, part, type) \
id_for_var_message(obj, name, type, "`%1$s' is not allowed as "#part" "#type" variable name")
#define id_for_var_message(obj, name, type, message) \
check_id_type(obj, &(name), rb_is_##type##_id, rb_is_##type##_name, message, strlen(message))
static ID
check_id_type(VALUE obj, VALUE *pname,
int (*valid_id_p)(ID), int (*valid_name_p)(VALUE),
const char *message, size_t message_len)
{
ID id = rb_check_id(pname);
VALUE name = *pname;
if (id ? !valid_id_p(id) : !valid_name_p(name)) {
rb_name_err_raise_str(rb_fstring_new(message, message_len),
obj, name);
}
return id;
}
/*
* call-seq:
* obj.remove_instance_variable(symbol) -> obj
*
* Removes the named instance variable from <i>obj</i>, returning that
* variable's value.
*
* class Dummy
* attr_reader :var
* def initialize
* @var = 99
* end
* def remove
* remove_instance_variable(:@var)
* end
* end
* d = Dummy.new
* d.var #=> 99
* d.remove #=> 99
* d.var #=> nil
*/
VALUE
rb_obj_remove_instance_variable(VALUE obj, VALUE name)
{
VALUE val = Qnil;
const ID id = id_for_var(obj, name, an, instance);
st_data_t n, v;
struct st_table *iv_index_tbl;
st_data_t index;
rb_check_frozen(obj);
if (!id) {
goto not_defined;
}
switch (BUILTIN_TYPE(obj)) {
case T_OBJECT:
iv_index_tbl = ROBJECT_IV_INDEX_TBL(obj);
if (!iv_index_tbl) break;
if (!st_lookup(iv_index_tbl, (st_data_t)id, &index)) break;
if (ROBJECT_NUMIV(obj) <= (long)index) break;
val = ROBJECT_IVPTR(obj)[index];
if (val != Qundef) {
ROBJECT_IVPTR(obj)[index] = Qundef;
return val;
}
break;
case T_CLASS:
case T_MODULE:
n = id;
if (RCLASS_IV_TBL(obj) && st_delete(RCLASS_IV_TBL(obj), &n, &v)) {
return (VALUE)v;
}
break;
default:
if (FL_TEST(obj, FL_EXIVAR)) {
if (generic_ivar_remove(obj, id, &val)) {
return val;
}
}
break;
}
not_defined:
rb_name_err_raise("instance variable %1$s not defined",
obj, name);
UNREACHABLE;
}
NORETURN(static void uninitialized_constant(VALUE, VALUE));
static void
uninitialized_constant(VALUE klass, VALUE name)
{
if (klass && rb_class_real(klass) != rb_cObject)
rb_name_err_raise("uninitialized constant %2$s::%1$s",
klass, name);
else
rb_name_err_raise("uninitialized constant %1$s",
klass, name);
}
VALUE
rb_const_missing(VALUE klass, VALUE name)
{
VALUE value = rb_funcallv(klass, rb_intern("const_missing"), 1, &name);
rb_vm_inc_const_missing_count();
return value;
}
/*
* call-seq:
* mod.const_missing(sym) -> obj
*
* Invoked when a reference is made to an undefined constant in
* <i>mod</i>. It is passed a symbol for the undefined constant, and
* returns a value to be used for that constant. The
* following code is an example of the same:
*
* def Foo.const_missing(name)
* name # return the constant name as Symbol
* end
*
* Foo::UNDEFINED_CONST #=> :UNDEFINED_CONST: symbol returned
*
* In the next example when a reference is made to an undefined constant,
* it attempts to load a file whose name is the lowercase version of the
* constant (thus class <code>Fred</code> is assumed to be in file
* <code>fred.rb</code>). If found, it returns the loaded class. It
* therefore implements an autoload feature similar to Kernel#autoload and
* Module#autoload.
*
* def Object.const_missing(name)
* @looked_for ||= {}
* str_name = name.to_s
* raise "Class not found: #{name}" if @looked_for[str_name]
* @looked_for[str_name] = 1
* file = str_name.downcase
* require file
* klass = const_get(name)
* return klass if klass
* raise "Class not found: #{name}"
* end
*
*/
VALUE
rb_mod_const_missing(VALUE klass, VALUE name)
{
rb_vm_pop_cfunc_frame();
uninitialized_constant(klass, name);
UNREACHABLE;
}
static void
autoload_mark(void *ptr)
{
rb_mark_tbl((st_table *)ptr);
}
static void
autoload_free(void *ptr)
{
st_free_table((st_table *)ptr);
}
static size_t
autoload_memsize(const void *ptr)
{
const st_table *tbl = ptr;
return st_memsize(tbl);
}
static const rb_data_type_t autoload_data_type = {
"autoload",
{autoload_mark, autoload_free, autoload_memsize,},
0, 0, RUBY_TYPED_FREE_IMMEDIATELY
};
#define check_autoload_table(av) \
(struct st_table *)rb_check_typeddata((av), &autoload_data_type)
static VALUE
autoload_data(VALUE mod, ID id)
{
struct st_table *tbl;
st_data_t val;
if (!st_lookup(RCLASS_IV_TBL(mod), autoload, &val) ||
!(tbl = check_autoload_table((VALUE)val)) ||
!st_lookup(tbl, (st_data_t)id, &val)) {
return 0;
}
return (VALUE)val;
}
/* always on stack, no need to mark */
struct autoload_state {
struct autoload_data_i *ele;
VALUE mod;
VALUE result;
ID id;
VALUE thread;
union {
struct list_node node;
struct list_head head;
} waitq;
};
struct autoload_data_i {
VALUE feature;
int safe_level;
VALUE value;
struct autoload_state *state; /* points to on-stack struct */
};
static void
autoload_i_mark(void *ptr)
{
struct autoload_data_i *p = ptr;
rb_gc_mark(p->feature);
rb_gc_mark(p->value);
}
static size_t
autoload_i_memsize(const void *ptr)
{
return sizeof(struct autoload_data_i);
}
static const rb_data_type_t autoload_data_i_type = {
"autoload_i",
{autoload_i_mark, RUBY_TYPED_DEFAULT_FREE, autoload_i_memsize,},
0, 0, RUBY_TYPED_FREE_IMMEDIATELY
};
#define check_autoload_data(av) \
(struct autoload_data_i *)rb_check_typeddata((av), &autoload_data_i_type)
void
rb_autoload(VALUE mod, ID id, const char *file)
{
if (!file || !*file) {
rb_raise(rb_eArgError, "empty file name");
}
rb_autoload_str(mod, id, rb_fstring_cstr(file));
}
void
rb_autoload_str(VALUE mod, ID id, VALUE file)
{
st_data_t av;
VALUE ad;
struct st_table *tbl;
struct autoload_data_i *ele;
rb_const_entry_t *ce;
if (!rb_is_const_id(id)) {
rb_raise(rb_eNameError, "autoload must be constant name: %"PRIsVALUE"",
QUOTE_ID(id));
}
Check_Type(file, T_STRING);
if (!RSTRING_LEN(file)) {
rb_raise(rb_eArgError, "empty file name");
}
ce = rb_const_lookup(mod, id);
if (ce && ce->value != Qundef) {
return;
}
rb_const_set(mod, id, Qundef);
tbl = RCLASS_IV_TBL(mod);
if (tbl && st_lookup(tbl, (st_data_t)autoload, &av)) {
tbl = check_autoload_table((VALUE)av);
}
else {
if (!tbl) tbl = RCLASS_IV_TBL(mod) = st_init_numtable();
av = (st_data_t)TypedData_Wrap_Struct(0, &autoload_data_type, 0);
st_add_direct(tbl, (st_data_t)autoload, av);
RB_OBJ_WRITTEN(mod, Qnil, av);
DATA_PTR(av) = tbl = st_init_numtable();
}
ad = TypedData_Make_Struct(0, struct autoload_data_i, &autoload_data_i_type, ele);
if (OBJ_TAINTED(file)) {
file = rb_str_dup(file);
FL_UNSET(file, FL_TAINT);
}
ele->feature = rb_fstring(file);
ele->safe_level = rb_safe_level();
ele->value = Qundef;
ele->state = 0;
st_insert(tbl, (st_data_t)id, (st_data_t)ad);
}
static void
autoload_delete(VALUE mod, ID id)
{
st_data_t val, load = 0, n = id;
if (st_lookup(RCLASS_IV_TBL(mod), (st_data_t)autoload, &val)) {
struct st_table *tbl = check_autoload_table((VALUE)val);
st_delete(tbl, &n, &load);
if (tbl->num_entries == 0) {
n = autoload;
st_delete(RCLASS_IV_TBL(mod), &n, &val);
}
}
}
static VALUE
autoload_provided(VALUE arg)
{
const char **p = (const char **)arg;
return rb_feature_provided(*p, p);
}
static VALUE
reset_safe(VALUE safe)
{
rb_set_safe_level_force((int)safe);
return safe;
}
static VALUE
check_autoload_required(VALUE mod, ID id, const char **loadingpath)
{
VALUE file, load;
struct autoload_data_i *ele;
const char *loading;
int safe;
if (!(load = autoload_data(mod, id)) || !(ele = check_autoload_data(load))) {
return 0;
}
file = ele->feature;
Check_Type(file, T_STRING);
if (!RSTRING_PTR(file) || !*RSTRING_PTR(file)) {
rb_raise(rb_eArgError, "empty file name");
}
loading = RSTRING_PTR(file);
safe = rb_safe_level();
rb_set_safe_level_force(0);
if (!rb_ensure(autoload_provided, (VALUE)&loading, reset_safe, (VALUE)safe)) {
return load;
}
if (loadingpath && loading) {
*loadingpath = loading;
return load;
}
return 0;
}
int
rb_autoloading_value(VALUE mod, ID id, VALUE* value)
{
VALUE load;
struct autoload_data_i *ele;
if (!(load = autoload_data(mod, id)) || !(ele = check_autoload_data(load))) {
return 0;
}
if (ele->state && ele->state->thread == rb_thread_current()) {
if (ele->value != Qundef) {
if (value) {
*value = ele->value;
}
return 1;
}
}
return 0;
}
static int
autoload_defined_p(VALUE mod, ID id)
{
rb_const_entry_t *ce = rb_const_lookup(mod, id);
if (!ce || ce->value != Qundef) {
return 0;
}
return !rb_autoloading_value(mod, id, NULL);
}
struct autoload_const_set_args {
VALUE mod;
ID id;
VALUE value;
};
static void const_tbl_update(struct autoload_const_set_args *);
static VALUE
autoload_const_set(VALUE arg)
{
struct autoload_const_set_args* args = (struct autoload_const_set_args *)arg;
VALUE klass = args->mod;
ID id = args->id;
check_before_mod_set(klass, id, args->value, "constant");
const_tbl_update(args);
return 0; /* ignored */
}
static VALUE
autoload_require(VALUE arg)
{
struct autoload_state *state = (struct autoload_state *)arg;
/* this may release GVL and switch threads: */
state->result = rb_funcall(rb_vm_top_self(), rb_intern("require"), 1,
state->ele->feature);
return state->result;
}
static VALUE
autoload_reset(VALUE arg)
{
struct autoload_state *state = (struct autoload_state *)arg;
int need_wakeups = 0;
if (state->ele->state == state) {
need_wakeups = 1;
state->ele->state = 0;
}
/* At the last, move a value defined in autoload to constant table */
if (RTEST(state->result) && state->ele->value != Qundef) {
int safe_backup;
struct autoload_const_set_args args;
args.mod = state->mod;
args.id = state->id;
args.value = state->ele->value;
safe_backup = rb_safe_level();
rb_set_safe_level_force(state->ele->safe_level);
rb_ensure(autoload_const_set, (VALUE)&args,
reset_safe, (VALUE)safe_backup);
}
/* wakeup any waiters we had */
if (need_wakeups) {
struct autoload_state *cur = 0, *nxt;
list_for_each_safe(&state->waitq.head, cur, nxt, waitq.node) {
VALUE th = cur->thread;
cur->thread = Qfalse;
list_del(&cur->waitq.node);
/*
* cur is stored on the stack of cur->waiting_th,
* do not touch cur after waking up waiting_th
*/
rb_thread_wakeup_alive(th);
}
}
return 0; /* ignored */
}
VALUE
rb_autoload_load(VALUE mod, ID id)
{
VALUE load, result;
const char *loading = 0, *src;
struct autoload_data_i *ele;
struct autoload_state state;
if (!autoload_defined_p(mod, id)) return Qfalse;
load = check_autoload_required(mod, id, &loading);
if (!load) return Qfalse;
src = rb_sourcefile();
if (src && loading && strcmp(src, loading) == 0) return Qfalse;
/* set ele->state for a marker of autoloading thread */
if (!(ele = check_autoload_data(load))) {
return Qfalse;
}
state.ele = ele;
state.mod = mod;
state.id = id;
state.thread = rb_thread_current();
if (!ele->state) {
ele->state = &state;
/*
* autoload_reset will wake up any threads added to this
* iff the GVL is released during autoload_require
*/
list_head_init(&state.waitq.head);
}
else if (state.thread == ele->state->thread) {
return Qfalse;
}
else {
list_add_tail(&ele->state->waitq.head, &state.waitq.node);
/*
* autoload_reset in other thread will resume us and remove us
* from the waitq list
*/
do {
rb_thread_sleep_deadly();
} while (state.thread != Qfalse);
}
/* autoload_data_i can be deleted by another thread while require */
result = rb_ensure(autoload_require, (VALUE)&state,
autoload_reset, (VALUE)&state);
RB_GC_GUARD(load);
return result;
}
VALUE
rb_autoload_p(VALUE mod, ID id)
{
VALUE load;
struct autoload_data_i *ele;
while (!autoload_defined_p(mod, id)) {
mod = RCLASS_SUPER(mod);
if (!mod) return Qnil;
}
load = check_autoload_required(mod, id, 0);
if (!load) return Qnil;
return (ele = check_autoload_data(load)) ? ele->feature : Qnil;
}
static VALUE
rb_const_get_0(VALUE klass, ID id, int exclude, int recurse, int visibility)
{
VALUE value, tmp, av;
int mod_retry = 0;
tmp = klass;
retry:
while (RTEST(tmp)) {
VALUE am = 0;
rb_const_entry_t *ce;
while ((ce = rb_const_lookup(tmp, id))) {
if (visibility && RB_CONST_PRIVATE_P(ce)) {
rb_name_err_raise("private constant %2$s::%1$s referenced",
klass, ID2SYM(id));
}
if (RB_CONST_DEPRECATED_P(ce)) {
if (klass == rb_cObject) {
rb_warn("constant ::%"PRIsVALUE" is deprecated", QUOTE_ID(id));
}
else {
rb_warn("constant %"PRIsVALUE"::%"PRIsVALUE" is deprecated",
rb_class_name(klass), QUOTE_ID(id));
}
}
value = ce->value;
if (value == Qundef) {
if (am == tmp) break;
am = tmp;
if (rb_autoloading_value(tmp, id, &av)) return av;
rb_autoload_load(tmp, id);
continue;
}
if (exclude && tmp == rb_cObject && klass != rb_cObject) {
rb_warn("toplevel constant %"PRIsVALUE" referenced by %"PRIsVALUE"::%"PRIsVALUE"",
QUOTE_ID(id), rb_class_name(klass), QUOTE_ID(id));
}
return value;
}
if (!recurse) break;
tmp = RCLASS_SUPER(tmp);
}
if (!exclude && !mod_retry && BUILTIN_TYPE(klass) == T_MODULE) {
mod_retry = 1;
tmp = rb_cObject;
goto retry;
}
return rb_const_missing(klass, ID2SYM(id));
}
VALUE
rb_const_get_from(VALUE klass, ID id)
{
return rb_const_get_0(klass, id, TRUE, TRUE, FALSE);
}
VALUE
rb_const_get(VALUE klass, ID id)
{
return rb_const_get_0(klass, id, FALSE, TRUE, FALSE);
}
VALUE
rb_const_get_at(VALUE klass, ID id)
{
return rb_const_get_0(klass, id, TRUE, FALSE, FALSE);
}
VALUE
rb_public_const_get_from(VALUE klass, ID id)
{
return rb_const_get_0(klass, id, TRUE, TRUE, TRUE);
}
VALUE
rb_public_const_get(VALUE klass, ID id)
{
return rb_const_get_0(klass, id, FALSE, TRUE, TRUE);
}
VALUE
rb_public_const_get_at(VALUE klass, ID id)
{
return rb_const_get_0(klass, id, TRUE, FALSE, TRUE);
}
/*
* call-seq:
* remove_const(sym) -> obj
*
* Removes the definition of the given constant, returning that
* constant's previous value. If that constant referred to
* a module, this will not change that module's name and can lead
* to confusion.
*/
VALUE
rb_mod_remove_const(VALUE mod, VALUE name)
{
const ID id = id_for_var(mod, name, a, constant);
if (!id) {
rb_name_err_raise("constant %2$s::%1$s not defined",
mod, name);
}
return rb_const_remove(mod, id);
}
VALUE
rb_const_remove(VALUE mod, ID id)
{
VALUE val;
rb_const_entry_t *ce;
rb_check_frozen(mod);
ce = rb_const_lookup(mod, id);
if (!ce || !rb_id_table_delete(RCLASS_CONST_TBL(mod), id)) {
if (rb_const_defined_at(mod, id)) {
rb_name_err_raise("cannot remove %2$s::%1$s",
mod, ID2SYM(id));
}
rb_name_err_raise("constant %2$s::%1$s not defined",
mod, ID2SYM(id));
}
rb_clear_constant_cache();
val = ce->value;
if (val == Qundef) {
autoload_delete(mod, id);
val = Qnil;
}
xfree(ce);
return val;
}
static int
cv_i_update(st_data_t *k, st_data_t *v, st_data_t a, int existing)
{
if (existing) return ST_STOP;
*v = a;
return ST_CONTINUE;
}
static enum rb_id_table_iterator_result
sv_i(ID key, VALUE v, void *a)
{
rb_const_entry_t *ce = (rb_const_entry_t *)v;
st_table *tbl = a;
if (rb_is_const_id(key)) {
st_update(tbl, (st_data_t)key, cv_i_update, (st_data_t)ce);
}
return ID_TABLE_CONTINUE;
}
static enum rb_id_table_iterator_result
rb_local_constants_i(ID const_name, VALUE const_value, void *ary)
{
rb_ary_push((VALUE)ary, ID2SYM(const_name));
return ID_TABLE_CONTINUE;
}
static VALUE
rb_local_constants(VALUE mod)
{
struct rb_id_table *tbl = RCLASS_CONST_TBL(mod);
VALUE ary;
if (!tbl) return rb_ary_new2(0);
ary = rb_ary_new2(rb_id_table_size(tbl));
rb_id_table_foreach(tbl, rb_local_constants_i, (void *)ary);
return ary;
}
void*
rb_mod_const_at(VALUE mod, void *data)
{
st_table *tbl = data;
if (!tbl) {
tbl = st_init_numtable();
}
if (RCLASS_CONST_TBL(mod)) {
rb_id_table_foreach(RCLASS_CONST_TBL(mod), sv_i, tbl);
}
return tbl;
}
void*
rb_mod_const_of(VALUE mod, void *data)
{
VALUE tmp = mod;
for (;;) {
data = rb_mod_const_at(tmp, data);
tmp = RCLASS_SUPER(tmp);
if (!tmp) break;
if (tmp == rb_cObject && mod != rb_cObject) break;
}
return data;
}
static int
list_i(st_data_t key, st_data_t value, VALUE ary)
{
ID sym = (ID)key;
rb_const_entry_t *ce = (rb_const_entry_t *)value;
if (RB_CONST_PUBLIC_P(ce)) rb_ary_push(ary, ID2SYM(sym));
return ST_CONTINUE;
}
VALUE
rb_const_list(void *data)
{
st_table *tbl = data;
VALUE ary;
if (!tbl) return rb_ary_new2(0);
ary = rb_ary_new2(tbl->num_entries);
st_foreach_safe(tbl, list_i, ary);
st_free_table(tbl);
return ary;
}
/*
* call-seq:
* mod.constants(inherit=true) -> array
*
* Returns an array of the names of the constants accessible in
* <i>mod</i>. This includes the names of constants in any included
* modules (example at start of section), unless the <i>inherit</i>
* parameter is set to <code>false</code>.
*
* The implementation makes no guarantees about the order in which the
* constants are yielded.
*
* IO.constants.include?(:SYNC) #=> true
* IO.constants(false).include?(:SYNC) #=> false
*
* Also see <code>Module::const_defined?</code>.
*/
VALUE
rb_mod_constants(int argc, const VALUE *argv, VALUE mod)
{
VALUE inherit;
if (argc == 0) {
inherit = Qtrue;
}
else {
rb_scan_args(argc, argv, "01", &inherit);
}
if (RTEST(inherit)) {
return rb_const_list(rb_mod_const_of(mod, 0));
}
else {
return rb_local_constants(mod);
}
}
static int
rb_const_defined_0(VALUE klass, ID id, int exclude, int recurse, int visibility)
{
VALUE tmp;
int mod_retry = 0;
rb_const_entry_t *ce;
tmp = klass;
retry:
while (tmp) {
if ((ce = rb_const_lookup(tmp, id))) {
if (visibility && RB_CONST_PRIVATE_P(ce)) {
return (int)Qfalse;
}
if (ce->value == Qundef && !check_autoload_required(tmp, id, 0) &&
!rb_autoloading_value(tmp, id, 0))
return (int)Qfalse;
return (int)Qtrue;
}
if (!recurse) break;
tmp = RCLASS_SUPER(tmp);
}
if (!exclude && !mod_retry && BUILTIN_TYPE(klass) == T_MODULE) {
mod_retry = 1;
tmp = rb_cObject;
goto retry;
}
return (int)Qfalse;
}
int
rb_const_defined_from(VALUE klass, ID id)
{
return rb_const_defined_0(klass, id, TRUE, TRUE, FALSE);
}
int
rb_const_defined(VALUE klass, ID id)
{
return rb_const_defined_0(klass, id, FALSE, TRUE, FALSE);
}
int
rb_const_defined_at(VALUE klass, ID id)
{
return rb_const_defined_0(klass, id, TRUE, FALSE, FALSE);
}
int
rb_public_const_defined_from(VALUE klass, ID id)
{
return rb_const_defined_0(klass, id, TRUE, TRUE, TRUE);
}
int
rb_public_const_defined(VALUE klass, ID id)
{
return rb_const_defined_0(klass, id, FALSE, TRUE, TRUE);
}
int
rb_public_const_defined_at(VALUE klass, ID id)
{
return rb_const_defined_0(klass, id, TRUE, FALSE, TRUE);
}
static void
check_before_mod_set(VALUE klass, ID id, VALUE val, const char *dest)
{
rb_check_frozen(klass);
}
void
rb_const_set(VALUE klass, ID id, VALUE val)
{
rb_const_entry_t *ce;
struct rb_id_table *tbl = RCLASS_CONST_TBL(klass);
if (NIL_P(klass)) {
rb_raise(rb_eTypeError, "no class/module to define constant %"PRIsVALUE"",
QUOTE_ID(id));
}
check_before_mod_set(klass, id, val, "constant");
if (!tbl) {
RCLASS_CONST_TBL(klass) = tbl = rb_id_table_create(0);
rb_clear_constant_cache();
ce = ZALLOC(rb_const_entry_t);
rb_id_table_insert(tbl, id, (VALUE)ce);
setup_const_entry(ce, klass, val, CONST_PUBLIC);
}
else {
struct autoload_const_set_args args;
args.mod = klass;
args.id = id;
args.value = val;
const_tbl_update(&args);
}
/*
* Resolve and cache class name immediately to resolve ambiguity
* and avoid order-dependency on const_tbl
*/
if (rb_cObject && (RB_TYPE_P(val, T_MODULE) || RB_TYPE_P(val, T_CLASS))) {
rb_class_name(val);
}
}
static void
const_tbl_update(struct autoload_const_set_args *args)
{
VALUE value;
VALUE klass = args->mod;
VALUE val = args->value;
ID id = args->id;
struct rb_id_table *tbl = RCLASS_CONST_TBL(klass);
rb_const_flag_t visibility = CONST_PUBLIC;
rb_const_entry_t *ce;
if (rb_id_table_lookup(tbl, id, &value)) {
ce = (rb_const_entry_t *)value;
if (ce->value == Qundef) {
VALUE load;
struct autoload_data_i *ele;
load = autoload_data(klass, id);
/* for autoloading thread, keep the defined value to autoloading storage */
if (load && (ele = check_autoload_data(load)) && ele->state &&
(ele->state->thread == rb_thread_current())) {
rb_clear_constant_cache();
ele->value = val; /* autoload_i is non-WB-protected */
return;
}
/* otherwise, allow to override */
autoload_delete(klass, id);
}
else {
VALUE name = QUOTE_ID(id);
visibility = ce->flag;
if (klass == rb_cObject)
rb_warn("already initialized constant %"PRIsVALUE"", name);
else
rb_warn("already initialized constant %"PRIsVALUE"::%"PRIsVALUE"",
rb_class_name(klass), name);
if (!NIL_P(ce->file) && ce->line) {
rb_compile_warn(RSTRING_PTR(ce->file), ce->line,
"previous definition of %"PRIsVALUE" was here", name);
}
}
rb_clear_constant_cache();
setup_const_entry(ce, klass, val, visibility);
} else {
rb_clear_constant_cache();
ce = ZALLOC(rb_const_entry_t);
rb_id_table_insert(tbl, id, (VALUE)ce);
setup_const_entry(ce, klass, val, visibility);
}
}
static void
setup_const_entry(rb_const_entry_t *ce, VALUE klass, VALUE val,
rb_const_flag_t visibility)
{
ce->flag = visibility;
RB_OBJ_WRITE(klass, &ce->value, val);
RB_OBJ_WRITE(klass, &ce->file, rb_source_location(&ce->line));
}
void
rb_define_const(VALUE klass, const char *name, VALUE val)
{
ID id = rb_intern(name);
if (!rb_is_const_id(id)) {
rb_warn("rb_define_const: invalid name `%s' for constant", name);
}
rb_const_set(klass, id, val);
}
void
rb_define_global_const(const char *name, VALUE val)
{
rb_define_const(rb_cObject, name, val);
}
static void
set_const_visibility(VALUE mod, int argc, const VALUE *argv,
rb_const_flag_t flag, rb_const_flag_t mask)
{
int i;
rb_const_entry_t *ce;
ID id;
rb_frozen_class_p(mod);
if (argc == 0) {
rb_warning("%"PRIsVALUE" with no argument is just ignored",
QUOTE_ID(rb_frame_callee()));
return;
}
for (i = 0; i < argc; i++) {
VALUE val = argv[i];
id = rb_check_id(&val);
if (!id) {
if (i > 0) {
rb_clear_constant_cache();
}
rb_name_err_raise("constant %2$s::%1$s not defined",
mod, val);
}
if ((ce = rb_const_lookup(mod, id))) {
ce->flag &= ~mask;
ce->flag |= flag;
}
else {
if (i > 0) {
rb_clear_constant_cache();
}
rb_name_err_raise("constant %2$s::%1$s not defined",
mod, ID2SYM(id));
}
}
rb_clear_constant_cache();
}
/*
* call-seq:
* mod.private_constant(symbol, ...) => mod
*
* Makes a list of existing constants private.
*/
VALUE
rb_mod_private_constant(int argc, const VALUE *argv, VALUE obj)
{
set_const_visibility(obj, argc, argv, CONST_PRIVATE, CONST_VISIBILITY_MASK);
return obj;
}
/*
* call-seq:
* mod.public_constant(symbol, ...) => mod
*
* Makes a list of existing constants public.
*/
VALUE
rb_mod_public_constant(int argc, const VALUE *argv, VALUE obj)
{
set_const_visibility(obj, argc, argv, CONST_PUBLIC, CONST_VISIBILITY_MASK);
return obj;
}
/*
* call-seq:
* mod.deprecate_constant(symbol, ...) => mod
*
* Makes a list of existing constants deprecated.
*/
VALUE
rb_mod_deprecate_constant(int argc, const VALUE *argv, VALUE obj)
{
set_const_visibility(obj, argc, argv, CONST_DEPRECATED, CONST_DEPRECATED);
return obj;
}
static VALUE
original_module(VALUE c)
{
if (RB_TYPE_P(c, T_ICLASS))
return RBASIC(c)->klass;
return c;
}
static int
cvar_lookup_at(VALUE klass, ID id, st_data_t *v)
{
if (!RCLASS_IV_TBL(klass)) return 0;
return st_lookup(RCLASS_IV_TBL(klass), (st_data_t)id, v);
}
static VALUE
cvar_front_klass(VALUE klass)
{
if (FL_TEST(klass, FL_SINGLETON)) {
VALUE obj = rb_ivar_get(klass, id__attached__);
if (RB_TYPE_P(obj, T_MODULE) || RB_TYPE_P(obj, T_CLASS)) {
return obj;
}
}
return RCLASS_SUPER(klass);
}
#define CVAR_FOREACH_ANCESTORS(klass, v, r) \
for (klass = cvar_front_klass(klass); klass; klass = RCLASS_SUPER(klass)) { \
if (cvar_lookup_at(klass, id, (v))) { \
r; \
} \
}
#define CVAR_LOOKUP(v,r) do {\
if (cvar_lookup_at(klass, id, (v))) {r;}\
CVAR_FOREACH_ANCESTORS(klass, v, r);\
} while(0)
void
rb_cvar_set(VALUE klass, ID id, VALUE val)
{
VALUE tmp, front = 0, target = 0;
tmp = klass;
CVAR_LOOKUP(0, {if (!front) front = klass; target = klass;});
if (target) {
if (front && target != front) {
st_data_t did = id;
if (RTEST(ruby_verbose)) {
rb_warning("class variable %"PRIsVALUE" of %"PRIsVALUE" is overtaken by %"PRIsVALUE"",
QUOTE_ID(id), rb_class_name(original_module(front)),
rb_class_name(original_module(target)));
}
if (BUILTIN_TYPE(front) == T_CLASS) {
st_delete(RCLASS_IV_TBL(front),&did,0);
}
}
}
else {
target = tmp;
}
check_before_mod_set(target, id, val, "class variable");
if (!RCLASS_IV_TBL(target)) {
RCLASS_IV_TBL(target) = st_init_numtable();
}
rb_class_ivar_set(target, id, val);
}
VALUE
rb_cvar_get(VALUE klass, ID id)
{
VALUE tmp, front = 0, target = 0;
st_data_t value;
tmp = klass;
CVAR_LOOKUP(&value, {if (!front) front = klass; target = klass;});
if (!target) {
rb_name_err_raise("uninitialized class variable %1$s in %2$s",
tmp, ID2SYM(id));
}
if (front && target != front) {
st_data_t did = id;
if (RTEST(ruby_verbose)) {
rb_warning("class variable %"PRIsVALUE" of %"PRIsVALUE" is overtaken by %"PRIsVALUE"",
QUOTE_ID(id), rb_class_name(original_module(front)),
rb_class_name(original_module(target)));
}
if (BUILTIN_TYPE(front) == T_CLASS) {
st_delete(RCLASS_IV_TBL(front),&did,0);
}
}
return (VALUE)value;
}
VALUE
rb_cvar_defined(VALUE klass, ID id)
{
if (!klass) return Qfalse;
CVAR_LOOKUP(0,return Qtrue);
return Qfalse;
}
static ID
cv_intern(VALUE klass, const char *name)
{
ID id = rb_intern(name);
if (!rb_is_class_id(id)) {
rb_name_err_raise("wrong class variable name %1$s",
klass, rb_str_new_cstr(name));
}
return id;
}
void
rb_cv_set(VALUE klass, const char *name, VALUE val)
{
ID id = cv_intern(klass, name);
rb_cvar_set(klass, id, val);
}
VALUE
rb_cv_get(VALUE klass, const char *name)
{
ID id = cv_intern(klass, name);
return rb_cvar_get(klass, id);
}
void
rb_define_class_variable(VALUE klass, const char *name, VALUE val)
{
ID id = cv_intern(klass, name);
rb_cvar_set(klass, id, val);
}
static int
cv_i(st_data_t k, st_data_t v, st_data_t a)
{
ID key = (ID)k;
st_table *tbl = (st_table *)a;
if (rb_is_class_id(key)) {
st_update(tbl, (st_data_t)key, cv_i_update, 0);
}
return ST_CONTINUE;
}
static void*
mod_cvar_at(VALUE mod, void *data)
{
st_table *tbl = data;
if (!tbl) {
tbl = st_init_numtable();
}
if (RCLASS_IV_TBL(mod)) {
st_foreach_safe(RCLASS_IV_TBL(mod), cv_i, (st_data_t)tbl);
}
return tbl;
}
static void*
mod_cvar_of(VALUE mod, void *data)
{
VALUE tmp = mod;
for (;;) {
data = mod_cvar_at(tmp, data);
tmp = RCLASS_SUPER(tmp);
if (!tmp) break;
}
return data;
}
static int
cv_list_i(st_data_t key, st_data_t value, VALUE ary)
{
ID sym = (ID)key;
rb_ary_push(ary, ID2SYM(sym));
return ST_CONTINUE;
}
static VALUE
cvar_list(void *data)
{
st_table *tbl = data;
VALUE ary;
if (!tbl) return rb_ary_new2(0);
ary = rb_ary_new2(tbl->num_entries);
st_foreach_safe(tbl, cv_list_i, ary);
st_free_table(tbl);
return ary;
}
/*
* call-seq:
* mod.class_variables(inherit=true) -> array
*
* Returns an array of the names of class variables in <i>mod</i>.
* This includes the names of class variables in any included
* modules, unless the <i>inherit</i> parameter is set to
* <code>false</code>.
*
* class One
* @@var1 = 1
* end
* class Two < One
* @@var2 = 2
* end
* One.class_variables #=> [:@@var1]
* Two.class_variables #=> [:@@var2, :@@var1]
* Two.class_variables(false) #=> [:@@var2]
*/
VALUE
rb_mod_class_variables(int argc, const VALUE *argv, VALUE mod)
{
VALUE inherit;
st_table *tbl;
if (argc == 0) {
inherit = Qtrue;
}
else {
rb_scan_args(argc, argv, "01", &inherit);
}
if (RTEST(inherit)) {
tbl = mod_cvar_of(mod, 0);
}
else {
tbl = mod_cvar_at(mod, 0);
}
return cvar_list(tbl);
}
/*
* call-seq:
* remove_class_variable(sym) -> obj
*
* Removes the definition of the <i>sym</i>, returning that
* constant's value.
*
* class Dummy
* @@var = 99
* puts @@var
* remove_class_variable(:@@var)
* p(defined? @@var)
* end
*
* <em>produces:</em>
*
* 99
* nil
*/
VALUE
rb_mod_remove_cvar(VALUE mod, VALUE name)
{
const ID id = id_for_var_message(mod, name, class, "wrong class variable name %1$s");
st_data_t val, n = id;
if (!id) {
not_defined:
rb_name_err_raise("class variable %1$s not defined for %2$s",
mod, name);
}
rb_check_frozen(mod);
if (RCLASS_IV_TBL(mod) && st_delete(RCLASS_IV_TBL(mod), &n, &val)) {
return (VALUE)val;
}
if (rb_cvar_defined(mod, id)) {
rb_name_err_raise("cannot remove %1$s for %2$s", mod, ID2SYM(id));
}
goto not_defined;
}
VALUE
rb_iv_get(VALUE obj, const char *name)
{
ID id = rb_intern(name);
return rb_ivar_get(obj, id);
}
VALUE
rb_iv_set(VALUE obj, const char *name, VALUE val)
{
ID id = rb_intern(name);
return rb_ivar_set(obj, id, val);
}
/* tbl = xx(obj); tbl[key] = value; */
int
rb_class_ivar_set(VALUE obj, ID key, VALUE value)
{
st_table *tbl = RCLASS_IV_TBL(obj);
int result = st_insert(tbl, (st_data_t)key, (st_data_t)value);
RB_OBJ_WRITTEN(obj, Qundef, value);
return result;
}
static int
tbl_copy_i(st_data_t key, st_data_t value, st_data_t data)
{
RB_OBJ_WRITTEN((VALUE)data, Qundef, (VALUE)value);
return ST_CONTINUE;
}
st_table *
rb_st_copy(VALUE obj, struct st_table *orig_tbl)
{
st_table *new_tbl = st_copy(orig_tbl);
st_foreach(new_tbl, tbl_copy_i, (st_data_t)obj);
return new_tbl;
}
rb_const_entry_t *
rb_const_lookup(VALUE klass, ID id)
{
struct rb_id_table *tbl = RCLASS_CONST_TBL(klass);
VALUE val;
if (tbl && rb_id_table_lookup(tbl, id, &val)) {
return (rb_const_entry_t *)val;
}
return 0;
}
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