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ruby/variable.c

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/**********************************************************************
variable.c -
$Author$
$Date$
created at: Tue Apr 19 23:55:15 JST 1994
Copyright (C) 1993-2001 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#include "ruby.h"
#include "env.h"
#include "node.h"
#include "st.h"
static st_table *rb_global_tbl;
st_table *rb_class_tbl;
void
Init_var_tables()
{
rb_global_tbl = st_init_numtable();
rb_class_tbl = st_init_numtable();
}
struct fc_result {
ID name;
VALUE klass;
VALUE path;
VALUE track;
struct fc_result *prev;
};
static int
fc_i(key, value, res)
ID key;
VALUE value;
struct fc_result *res;
{
VALUE path;
char *name;
if (!rb_is_const_id(key)) return ST_CONTINUE;
name = rb_id2name(key);
if (res->path) {
path = rb_str_dup(res->path);
rb_str_cat2(path, "::");
rb_str_cat2(path, name);
}
else {
path = rb_str_new2(name);
}
if (value == res->klass) {
res->name = key;
res->path = path;
return ST_STOP;
}
if (rb_obj_is_kind_of(value, rb_cModule)) {
struct fc_result arg;
struct fc_result *list;
if (!RCLASS(value)->iv_tbl) return ST_CONTINUE;
list = res;
while (list) {
if (list->track == value) return ST_CONTINUE;
list = list->prev;
}
arg.name = 0;
arg.path = path;
arg.klass = res->klass;
arg.track = value;
arg.prev = res;
st_foreach(RCLASS(value)->iv_tbl, fc_i, &arg);
if (arg.name) {
res->name = arg.name;
res->path = arg.path;
return ST_STOP;
}
}
return ST_CONTINUE;
}
static VALUE
find_class_path(klass)
VALUE klass;
{
struct fc_result arg;
arg.name = 0;
arg.path = 0;
arg.klass = klass;
arg.track = rb_cObject;
arg.prev = 0;
if (RCLASS(rb_cObject)->iv_tbl) {
st_foreach(RCLASS(rb_cObject)->iv_tbl, fc_i, &arg);
}
if (arg.name == 0) {
st_foreach(rb_class_tbl, fc_i, &arg);
}
if (arg.name) {
st_insert(ROBJECT(klass)->iv_tbl,rb_intern("__classpath__"),arg.path);
return arg.path;
}
return Qnil;
}
static VALUE
classname(klass)
VALUE klass;
{
VALUE path = Qnil;
ID classpath = rb_intern("__classpath__");
while (TYPE(klass) == T_ICLASS || FL_TEST(klass, FL_SINGLETON)) {
klass = (VALUE)RCLASS(klass)->super;
}
if (!klass) klass = rb_cObject;
if (!ROBJECT(klass)->iv_tbl)
ROBJECT(klass)->iv_tbl = st_init_numtable();
else if (!st_lookup(ROBJECT(klass)->iv_tbl, classpath, &path)) {
ID classid = rb_intern("__classid__");
if (st_lookup(ROBJECT(klass)->iv_tbl, classid, &path)) {
path = rb_str_new2(rb_id2name(SYM2ID(path)));
st_insert(ROBJECT(klass)->iv_tbl, classpath, path);
st_delete(RCLASS(klass)->iv_tbl, &classid, 0);
}
}
if (NIL_P(path)) {
path = find_class_path(klass);
if (NIL_P(path)) {
return 0;
}
return path;
}
if (TYPE(path) != T_STRING)
rb_bug("class path is not set properly");
return path;
}
VALUE
rb_mod_name(mod)
VALUE mod;
{
VALUE path = classname(mod);
if (path) return rb_str_dup(path);
return rb_str_new(0,0);
}
VALUE
rb_class_path(klass)
VALUE klass;
{
VALUE path = classname(klass);
if (path) return path;
else {
char buf[256];
char *s = "Class";
if (TYPE(klass) == T_MODULE) s = "Module";
sprintf(buf, "#<%s 0lx%lx>", s, klass);
return rb_str_new2(buf);
}
}
void
rb_set_class_path(klass, under, name)
VALUE klass, under;
const char *name;
{
VALUE str;
if (under == rb_cObject) {
str = rb_str_new2(name);
}
else {
str = rb_str_dup(rb_class_path(under));
rb_str_cat2(str, "::");
rb_str_cat2(str, name);
}
rb_iv_set(klass, "__classpath__", str);
}
VALUE
rb_path2class(path)
const char *path;
{
VALUE c;
if (path[0] == '#') {
rb_raise(rb_eArgError, "can't retrieve anonymous class %s", path);
}
c = rb_eval_string(path);
switch (TYPE(c)) {
case T_MODULE:
case T_CLASS:
break;
default:
rb_raise(rb_eTypeError, "class path %s does not point class", path);
}
return c;
}
void
rb_name_class(klass, id)
VALUE klass;
ID id;
{
rb_iv_set(klass, "__classid__", ID2SYM(id));
}
static st_table *autoload_tbl = 0;
static void
rb_autoload_id(id, filename)
ID id;
const char *filename;
{
rb_secure(4);
if (!rb_is_const_id(id)) {
rb_raise(rb_eNameError, "autoload must be constant name",
rb_id2name(id));
}
if (!autoload_tbl) {
autoload_tbl = st_init_numtable();
}
st_insert(autoload_tbl, id, strdup(filename));
}
void
rb_autoload(klass, filename)
const char *klass, *filename;
{
rb_autoload_id(rb_intern(klass), filename);
}
VALUE
rb_f_autoload(obj, klass, file)
VALUE obj, klass, file;
{
rb_autoload_id(rb_to_id(klass), STR2CSTR(file));
return Qnil;
}
char *
rb_class2name(klass)
VALUE klass;
{
if (klass == rb_cNilClass) return "nil";
if (klass == rb_cTrueClass) return "true";
if (klass == rb_cFalseClass) return "false";
return RSTRING(rb_class_path(klass))->ptr;
}
struct trace_var {
int removed;
void (*func)();
VALUE data;
struct trace_var *next;
};
struct global_entry {
ID id;
void *data;
VALUE (*getter)();
void (*setter)();
void (*marker)();
int block_trace;
struct trace_var *trace;
};
static VALUE undef_getter();
static void undef_setter();
static void undef_marker();
static VALUE val_getter();
static void val_setter();
static void val_marker();
static VALUE var_getter();
static void var_setter();
static void var_marker();
struct global_entry*
rb_global_entry(id)
ID id;
{
struct global_entry *entry;
if (!st_lookup(rb_global_tbl, id, &entry)) {
entry = ALLOC(struct global_entry);
st_add_direct(rb_global_tbl, id, entry);
entry->id = id;
entry->data = 0;
entry->getter = undef_getter;
entry->setter = undef_setter;
entry->marker = undef_marker;
entry->block_trace = 0;
entry->trace = 0;
}
return entry;
}
static VALUE
undef_getter(id)
ID id;
{
if (ruby_verbose) {
rb_warning("global variable `%s' not initialized", rb_id2name(id));
}
return Qnil;
}
static void
undef_setter(val, id, data, entry)
VALUE val;
ID id;
void *data;
struct global_entry *entry;
{
entry->getter = val_getter;
entry->setter = val_setter;
entry->marker = val_marker;
entry->data = (void*)val;
}
static void
undef_marker()
{
}
static VALUE
val_getter(id, val)
ID id;
VALUE val;
{
return val;
}
static void
val_setter(val, id, data, entry)
VALUE val;
ID id;
void *data;
struct global_entry *entry;
{
entry->data = (void*)val;
}
static void
val_marker(data)
VALUE data;
{
if (data) rb_gc_mark_maybe(data);
}
static VALUE
var_getter(id, var)
ID id;
VALUE *var;
{
if (!var || !*var) return Qnil;
return *var;
}
static void
var_setter(val, id, var)
VALUE val;
ID id;
VALUE *var;
{
*var = val;
}
static void
var_marker(var)
VALUE *var;
{
if (var) rb_gc_mark_maybe(*var);
}
static void
readonly_setter(val, id, var)
VALUE val;
ID id;
void *var;
{
rb_raise(rb_eNameError, "can't set variable %s", rb_id2name(id));
}
static int
mark_global_entry(key, entry)
ID key;
struct global_entry *entry;
{
struct trace_var *trace;
(*entry->marker)(entry->data);
trace = entry->trace;
while (trace) {
if (trace->data) rb_gc_mark_maybe(trace->data);
trace = trace->next;
}
return ST_CONTINUE;
}
void
rb_gc_mark_global_tbl()
{
st_foreach(rb_global_tbl, mark_global_entry, 0);
}
static ID
global_id(name)
const char *name;
{
ID id;
if (name[0] == '$') id = rb_intern(name);
else {
char *buf = ALLOCA_N(char, strlen(name)+2);
buf[0] = '$';
strcpy(buf+1, name);
id = rb_intern(buf);
}
return id;
}
void
rb_define_hooked_variable(name, var, getter, setter)
const char *name;
VALUE *var;
VALUE (*getter)();
void (*setter)();
{
struct global_entry *entry;
ID id = global_id(name);
entry = rb_global_entry(id);
entry->data = (void*)var;
entry->getter = getter?getter:var_getter;
entry->setter = setter?setter:var_setter;
entry->marker = var_marker;
}
void
rb_define_variable(name, var)
const char *name;
VALUE *var;
{
rb_define_hooked_variable(name, var, 0, 0);
}
void
rb_define_readonly_variable(name, var)
const char *name;
VALUE *var;
{
rb_define_hooked_variable(name, var, 0, readonly_setter);
}
void
rb_define_virtual_variable(name, getter, setter)
const char *name;
VALUE (*getter)();
void (*setter)();
{
if (!getter) getter = val_getter;
if (!setter) setter = readonly_setter;
rb_define_hooked_variable(name, 0, getter, setter);
}
static void
rb_trace_eval(cmd, val)
VALUE cmd, val;
{
rb_eval_cmd(cmd, rb_ary_new3(1, val));
}
VALUE
rb_f_trace_var(argc, argv)
int argc;
VALUE *argv;
{
VALUE var, cmd;
ID id;
struct global_entry *entry;
struct trace_var *trace;
if (rb_scan_args(argc, argv, "11", &var, &cmd) == 1) {
cmd = rb_f_lambda();
}
if (NIL_P(cmd)) {
return rb_f_untrace_var(argc, argv);
}
id = rb_to_id(var);
if (!st_lookup(rb_global_tbl, id, &entry)) {
rb_raise(rb_eNameError, "undefined global variable %s",
rb_id2name(id));
}
trace = ALLOC(struct trace_var);
trace->next = entry->trace;
trace->func = rb_trace_eval;
trace->data = cmd;
trace->removed = 0;
entry->trace = trace;
return Qnil;
}
static void
remove_trace(entry)
struct global_entry *entry;
{
struct trace_var *trace = entry->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;
free(next);
}
trace = next;
}
entry->trace = t.next;
}
VALUE
rb_f_untrace_var(argc, argv)
int argc;
VALUE *argv;
{
VALUE var, cmd;
ID id;
struct global_entry *entry;
struct trace_var *trace;
rb_scan_args(argc, argv, "11", &var, &cmd);
id = rb_to_id(var);
if (!st_lookup(rb_global_tbl, id, &entry)) {
rb_raise(rb_eNameError, "undefined global variable %s",
rb_id2name(id));
}
trace = entry->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;
}
entry->trace = 0;
if (!entry->block_trace) remove_trace(entry);
return ary;
}
else {
while (trace) {
if (trace->data == cmd) {
trace->removed = 1;
if (!entry->block_trace) remove_trace(entry);
return rb_ary_new3(1, cmd);
}
trace = trace->next;
}
}
return Qnil;
}
VALUE
rb_gvar_get(entry)
struct global_entry *entry;
{
return (*entry->getter)(entry->id, entry->data, entry);
}
struct trace_data {
struct trace_var *trace;
VALUE val;
};
static VALUE
trace_ev(data)
struct trace_data *data;
{
struct trace_var *trace = data->trace;
while (trace) {
(*trace->func)(trace->data, data->val);
trace = trace->next;
}
return Qnil; /* not reached */
}
static VALUE
trace_en(entry)
struct global_entry *entry;
{
entry->block_trace = 0;
remove_trace(entry);
return Qnil; /* not reached */
}
VALUE
rb_gvar_set(entry, val)
struct global_entry *entry;
VALUE val;
{
struct trace_data trace;
if (rb_safe_level() >= 4)
rb_raise(rb_eSecurityError, "Insecure: can't change global variable value");
(*entry->setter)(val, entry->id, entry->data, entry);
if (entry->trace && !entry->block_trace) {
entry->block_trace = 1;
trace.trace = entry->trace;
trace.val = val;
rb_ensure(trace_ev, (VALUE)&trace, trace_en, (VALUE)entry);
}
return val;
}
VALUE
rb_gv_set(name, val)
const char *name;
VALUE val;
{
struct global_entry *entry;
entry = rb_global_entry(global_id(name));
return rb_gvar_set(entry, val);
}
VALUE
rb_gv_get(name)
const char *name;
{
struct global_entry *entry;
entry = rb_global_entry(global_id(name));
return rb_gvar_get(entry);
}
VALUE
rb_gvar_defined(entry)
struct global_entry *entry;
{
if (entry->getter == undef_getter) return Qfalse;
return Qtrue;
}
static int
gvar_i(key, entry, ary)
ID key;
struct global_entry *entry;
VALUE ary;
{
rb_ary_push(ary, rb_str_new2(rb_id2name(key)));
return ST_CONTINUE;
}
VALUE
rb_f_global_variables()
{
VALUE ary = rb_ary_new();
char buf[4];
char *s = "&`'+123456789";
st_foreach(rb_global_tbl, gvar_i, ary);
if (!NIL_P(rb_backref_get())) {
while (*s) {
sprintf(buf, "$%c", *s++);
rb_ary_push(ary, rb_str_new2(buf));
}
}
return ary;
}
void
rb_alias_variable(name1, name2)
ID name1;
ID name2;
{
struct global_entry *entry1, *entry2;
entry1 = rb_global_entry(name1);
entry2 = rb_global_entry(name2);
entry1->data = entry2->data;
entry1->getter = entry2->getter;
entry1->setter = entry2->setter;
entry1->marker = entry2->marker;
}
static int special_generic_ivar = 0;
static st_table *generic_iv_tbl;
st_table*
rb_generic_ivar_table(obj)
VALUE obj;
{
st_table *tbl;
if (!generic_iv_tbl) return 0;
if (!st_lookup(generic_iv_tbl, obj, &tbl)) return 0;
return tbl;
}
static VALUE
generic_ivar_get(obj, id)
VALUE obj;
ID id;
{
st_table *tbl;
VALUE val;
if (!generic_iv_tbl) return Qnil;
if (!st_lookup(generic_iv_tbl, obj, &tbl)) return Qnil;
if (st_lookup(tbl, id, &val)) {
return val;
}
return Qnil;
}
static void
generic_ivar_set(obj, id, val)
VALUE obj;
ID id;
VALUE val;
{
st_table *tbl;
if (rb_special_const_p(obj)) {
special_generic_ivar = 1;
}
if (!generic_iv_tbl) {
generic_iv_tbl = st_init_numtable();
}
if (!st_lookup(generic_iv_tbl, obj, &tbl)) {
FL_SET(obj, FL_EXIVAR);
tbl = st_init_numtable();
st_add_direct(generic_iv_tbl, obj, tbl);
st_add_direct(tbl, id, val);
return;
}
st_insert(tbl, id, val);
}
static VALUE
generic_ivar_defined(obj, id)
VALUE obj;
ID id;
{
st_table *tbl;
VALUE val;
if (!generic_iv_tbl) return Qfalse;
if (!st_lookup(generic_iv_tbl, obj, &tbl)) return Qfalse;
if (st_lookup(tbl, id, &val)) {
return Qtrue;
}
return Qfalse;
}
static VALUE
generic_ivar_remove(obj, id)
VALUE obj;
ID id;
{
st_table *tbl;
VALUE val;
if (!generic_iv_tbl) return Qnil;
if (!st_lookup(generic_iv_tbl, obj, &tbl)) return Qnil;
st_delete(tbl, &id, &val);
if (tbl->num_entries == 0) {
st_delete(generic_iv_tbl, &obj, &tbl);
st_free_table(tbl);
}
return val;
}
void
rb_mark_generic_ivar(obj)
VALUE obj;
{
st_table *tbl;
if (!generic_iv_tbl) return;
if (st_lookup(generic_iv_tbl, obj, &tbl)) {
rb_mark_tbl(tbl);
}
}
static int
givar_mark_i(key, value)
ID key;
VALUE value;
{
rb_gc_mark(value);
return ST_CONTINUE;
}
static int
givar_i(obj, tbl)
VALUE obj;
st_table *tbl;
{
if (rb_special_const_p(obj)) {
st_foreach(tbl, givar_mark_i, 0);
}
return ST_CONTINUE;
}
void
rb_mark_generic_ivar_tbl()
{
if (!generic_iv_tbl) return;
if (special_generic_ivar == 0) return;
st_foreach(generic_iv_tbl, givar_i, 0);
}
void
rb_free_generic_ivar(obj)
VALUE obj;
{
st_table *tbl;
if (st_delete(generic_iv_tbl, &obj, &tbl))
st_free_table(tbl);
}
void
rb_clone_generic_ivar(clone, obj)
VALUE clone, obj;
{
st_table *tbl;
if (!generic_iv_tbl) return;
if (st_lookup(generic_iv_tbl, obj, &tbl)) {
st_add_direct(generic_iv_tbl, clone, st_copy(tbl));
}
}
VALUE
rb_ivar_get(obj, id)
VALUE obj;
ID id;
{
VALUE val;
switch (TYPE(obj)) {
case T_OBJECT:
case T_CLASS:
case T_MODULE:
if (ROBJECT(obj)->iv_tbl && st_lookup(ROBJECT(obj)->iv_tbl, id, &val))
return val;
break;
default:
if (FL_TEST(obj, FL_EXIVAR) || rb_special_const_p(obj))
return generic_ivar_get(obj, id);
break;
}
if (ruby_verbose) {
rb_warning("instance variable %s not initialized", rb_id2name(id));
}
return Qnil;
}
VALUE
rb_ivar_set(obj, id, val)
VALUE obj;
ID id;
VALUE val;
{
if (!OBJ_TAINTED(obj) && rb_safe_level() >= 4)
rb_raise(rb_eSecurityError, "Insecure: can't modify instance variable");
if (OBJ_FROZEN(obj)) rb_error_frozen("object");
switch (TYPE(obj)) {
case T_OBJECT:
case T_CLASS:
case T_MODULE:
if (!ROBJECT(obj)->iv_tbl) ROBJECT(obj)->iv_tbl = st_init_numtable();
st_insert(ROBJECT(obj)->iv_tbl, id, val);
break;
default:
generic_ivar_set(obj, id, val);
break;
}
return val;
}
VALUE
rb_ivar_defined(obj, id)
VALUE obj;
ID id;
{
switch (TYPE(obj)) {
case T_OBJECT:
case T_CLASS:
case T_MODULE:
if (ROBJECT(obj)->iv_tbl && st_lookup(ROBJECT(obj)->iv_tbl, id, 0))
return Qtrue;
break;
default:
if (FL_TEST(obj, FL_EXIVAR) || rb_special_const_p(obj))
return generic_ivar_defined(obj, id);
break;
}
return Qfalse;
}
static int
ivar_i(key, entry, ary)
ID key;
struct global_entry *entry;
VALUE ary;
{
if (rb_is_instance_id(key)) {
rb_ary_push(ary, rb_str_new2(rb_id2name(key)));
}
return ST_CONTINUE;
}
VALUE
rb_obj_instance_variables(obj)
VALUE obj;
{
VALUE ary;
ary = rb_ary_new();
switch (TYPE(obj)) {
case T_OBJECT:
case T_CLASS:
case T_MODULE:
if (ROBJECT(obj)->iv_tbl) {
st_foreach(ROBJECT(obj)->iv_tbl, ivar_i, ary);
}
break;
default:
if (!generic_iv_tbl) break;
if (FL_TEST(obj, FL_EXIVAR) || rb_special_const_p(obj)) {
st_table *tbl;
if (st_lookup(generic_iv_tbl, obj, &tbl)) {
st_foreach(tbl, ivar_i, ary);
}
}
break;
}
return ary;
}
VALUE
rb_obj_remove_instance_variable(obj, name)
VALUE obj, name;
{
VALUE val = Qnil;
ID id = rb_to_id(name);
if (!OBJ_TAINTED(obj) && rb_safe_level() >= 4)
rb_raise(rb_eSecurityError, "Insecure: can't modify instance variable");
if (OBJ_FROZEN(obj)) rb_error_frozen("object");
if (!rb_is_instance_id(id)) {
rb_raise(rb_eNameError, "`%s' is not an instance variable",
rb_id2name(id));
}
switch (TYPE(obj)) {
case T_OBJECT:
case T_CLASS:
case T_MODULE:
if (ROBJECT(obj)->iv_tbl) {
st_delete(ROBJECT(obj)->iv_tbl, &id, &val);
}
break;
default:
if (FL_TEST(obj, FL_EXIVAR) || rb_special_const_p(obj))
return generic_ivar_remove(obj, id);
break;
}
return val;
}
static int
top_const_get(id, klassp)
ID id;
VALUE *klassp;
{
/* pre-defined class */
if (st_lookup(rb_class_tbl, id, klassp)) return Qtrue;
/* autoload */
if (autoload_tbl && st_lookup(autoload_tbl, id, 0)) {
rb_autoload_load(id);
*klassp = rb_const_get(rb_cObject, id);
return Qtrue;
}
return Qfalse;
}
VALUE
rb_const_get_at(klass, id)
VALUE klass;
ID id;
{
VALUE value;
if (RCLASS(klass)->iv_tbl && st_lookup(RCLASS(klass)->iv_tbl, id, &value)) {
return value;
}
if (klass == rb_cObject && top_const_get(id, &value)) {
return value;
}
rb_raise(rb_eNameError, "uninitialized constant %s::%s",
RSTRING(rb_class_path(klass))->ptr,
rb_id2name(id));
return Qnil; /* not reached */
}
void
rb_autoload_load(id)
ID id;
{
char *modname;
VALUE module;
st_delete(autoload_tbl, &id, &modname);
if (rb_provided(modname)) {
free(modname);
return;
}
module = rb_str_new2(modname);
free(modname);
FL_UNSET(module, FL_TAINT);
rb_f_require(Qnil, module);
}
VALUE
rb_const_get(klass, id)
VALUE klass;
ID id;
{
VALUE value;
VALUE tmp;
tmp = klass;
while (tmp) {
if (RCLASS(tmp)->iv_tbl && st_lookup(RCLASS(tmp)->iv_tbl,id,&value)) {
return value;
}
if (tmp == rb_cObject && top_const_get(id, &value)) return value;
tmp = RCLASS(tmp)->super;
}
if (BUILTIN_TYPE(klass) == T_MODULE) {
return rb_const_get(rb_cObject, id);
}
/* Uninitialized constant */
if (klass && klass != rb_cObject)
rb_raise(rb_eNameError, "uninitialized constant %s::%s",
RSTRING(rb_class_path(klass))->ptr,
rb_id2name(id));
else {
rb_raise(rb_eNameError, "uninitialized constant %s",rb_id2name(id));
}
return Qnil; /* not reached */
}
static int
sv_i(key, value, ary)
ID key;
VALUE value;
VALUE ary;
{
if (rb_is_const_id(key)) {
VALUE kval = rb_str_new2(rb_id2name(key));
if (!rb_ary_includes(ary, kval)) {
rb_ary_push(ary, kval);
}
}
return ST_CONTINUE;
}
VALUE
rb_mod_remove_const(mod, name)
VALUE mod, name;
{
ID id = rb_to_id(name);
VALUE val;
if (!rb_is_const_id(id)) {
rb_raise(rb_eNameError, "`%s' is not constant", rb_id2name(id));
}
if (!OBJ_TAINTED(mod) && rb_safe_level() >= 4)
rb_raise(rb_eSecurityError, "Insecure: can't remove constant");
if (OBJ_FROZEN(mod)) rb_error_frozen("class/module");
if (RCLASS(mod)->iv_tbl && st_delete(ROBJECT(mod)->iv_tbl, &id, &val)) {
return val;
}
if (rb_const_defined_at(mod, id)) {
rb_raise(rb_eNameError, "cannot remove %s::%s",
rb_class2name(mod), rb_id2name(id));
}
rb_raise(rb_eNameError, "constant %s::%s not defined",
rb_class2name(mod), rb_id2name(id));
return Qnil; /* not reached */
}
static int
autoload_i(key, name, ary)
ID key;
const char *name;
VALUE ary;
{
VALUE kval = rb_str_new2(rb_id2name(key));
if (!rb_ary_includes(ary, kval)) {
rb_ary_push(ary, kval);
}
return ST_CONTINUE;
}
VALUE
rb_mod_const_at(mod, ary)
VALUE mod, ary;
{
if (RCLASS(mod)->iv_tbl) {
st_foreach(RCLASS(mod)->iv_tbl, sv_i, ary);
}
if ((VALUE)mod == rb_cObject) {
st_foreach(rb_class_tbl, sv_i, ary);
if (autoload_tbl) {
st_foreach(autoload_tbl, autoload_i, ary);
}
}
return ary;
}
VALUE
rb_mod_const_of(mod, ary)
VALUE mod;
VALUE ary;
{
for (;;) {
rb_mod_const_at(mod, ary);
mod = RCLASS(mod)->super;
if (!mod) break;
}
return ary;
}
VALUE
rb_mod_constants(mod)
VALUE mod;
{
return rb_mod_const_of(mod, rb_ary_new());
}
int
rb_const_defined_at(klass, id)
VALUE klass;
ID id;
{
if (RCLASS(klass)->iv_tbl && st_lookup(RCLASS(klass)->iv_tbl, id, 0)) {
return Qtrue;
}
if (klass == rb_cObject) {
return rb_const_defined(klass, id);
}
return Qfalse;
}
int
rb_autoload_defined(id)
ID id;
{
if (autoload_tbl && st_lookup(autoload_tbl, id, 0))
return Qtrue;
return Qfalse;
}
int
rb_const_defined(klass, id)
VALUE klass;
ID id;
{
VALUE tmp = klass;
while (tmp) {
if (RCLASS(tmp)->iv_tbl && st_lookup(RCLASS(tmp)->iv_tbl,id,0)) {
return Qtrue;
}
tmp = RCLASS(tmp)->super;
}
if (BUILTIN_TYPE(klass) == T_MODULE) {
return rb_const_defined(rb_cObject, id);
}
if (st_lookup(rb_class_tbl, id, 0))
return Qtrue;
return rb_autoload_defined(id);
}
static void
mod_av_set(klass, id, val, isconst)
VALUE klass;
ID id;
VALUE val;
int isconst;
{
char *dest = isconst ? "constant" : "class variable";
if (!OBJ_TAINTED(klass) && rb_safe_level() >= 4)
rb_raise(rb_eSecurityError, "Insecure: can't set %s", dest);
if (OBJ_FROZEN(klass)) rb_error_frozen("class/module");
if (!RCLASS(klass)->iv_tbl) {
RCLASS(klass)->iv_tbl = st_init_numtable();
}
else if (isconst && st_lookup(RCLASS(klass)->iv_tbl, id, 0)) {
rb_warn("already initialized %s %s", dest, rb_id2name(id));
}
st_insert(RCLASS(klass)->iv_tbl, id, val);
}
void
rb_const_set(klass, id, val)
VALUE klass;
ID id;
VALUE val;
{
mod_av_set(klass, id, val, Qtrue);
}
void
rb_const_assign(klass, id, val)
VALUE klass;
ID id;
VALUE val;
{
VALUE tmp = klass;
while (tmp) {
if (RCLASS(tmp)->iv_tbl && st_lookup(RCLASS(tmp)->iv_tbl,id,0)) {
st_insert(RCLASS(tmp)->iv_tbl, id, val);
return;
}
tmp = RCLASS(tmp)->super;
}
/* pre-defined class */
if (st_lookup(rb_class_tbl, id, 0)) {
st_delete(rb_class_tbl, id, 0);
st_insert(RCLASS(rb_cObject)->iv_tbl, id, val);
return;
}
/* autoload */
if (autoload_tbl && st_lookup(autoload_tbl, id, 0)) {
char *modname;
st_delete(autoload_tbl, &id, &modname);
free(modname);
st_insert(RCLASS(rb_cObject)->iv_tbl, id, val);
return;
}
/* Uninitialized constant */
if (klass && klass != rb_cObject)
rb_raise(rb_eNameError, "uninitialized constant %s::%s",
RSTRING(rb_class_path(klass))->ptr,
rb_id2name(id));
else {
rb_raise(rb_eNameError, "uninitialized constant %s",rb_id2name(id));
}
}
void
rb_define_const(klass, name, val)
VALUE klass;
const char *name;
VALUE val;
{
ID id = rb_intern(name);
if (klass == rb_cObject) {
rb_secure(4);
}
if (!rb_is_const_id(id)) {
rb_raise(rb_eNameError, "wrong constant name %s", name);
}
rb_const_set(klass, id, val);
}
void
rb_define_global_const(name, val)
const char *name;
VALUE val;
{
rb_define_const(rb_cObject, name, val);
}
VALUE
rb_cvar_singleton(obj)
VALUE obj;
{
switch (TYPE(obj)) {
case T_MODULE:
case T_CLASS:
return obj;
default:
break;
}
return CLASS_OF(obj);
}
void
rb_cvar_set(klass, id, val)
VALUE klass;
ID id;
VALUE val;
{
VALUE tmp;
tmp = klass;
while (tmp) {
if (RCLASS(tmp)->iv_tbl && st_lookup(RCLASS(tmp)->iv_tbl,id,0)) {
if (!OBJ_TAINTED(tmp) && rb_safe_level() >= 4)
rb_raise(rb_eSecurityError, "Insecure: can't modify class variable");
st_insert(RCLASS(tmp)->iv_tbl,id,val);
return;
}
tmp = RCLASS(tmp)->super;
}
rb_raise(rb_eNameError,"uninitialized class variable %s in %s",
rb_id2name(id), rb_class2name(klass));
}
void
rb_cvar_declare(klass, id, val)
VALUE klass;
ID id;
VALUE val;
{
VALUE tmp;
tmp = klass;
while (tmp) {
if (RCLASS(tmp)->iv_tbl && st_lookup(RCLASS(tmp)->iv_tbl,id,0)) {
if (!OBJ_TAINTED(tmp) && rb_safe_level() >= 4)
rb_raise(rb_eSecurityError, "Insecure: can't modify class variable");
st_insert(RCLASS(tmp)->iv_tbl,id,val);
return;
}
tmp = RCLASS(tmp)->super;
}
mod_av_set(klass, id, val, Qfalse);
}
VALUE
rb_cvar_get(klass, id)
VALUE klass;
ID id;
{
VALUE value;
VALUE tmp;
tmp = klass;
while (tmp) {
if (RCLASS(tmp)->iv_tbl && st_lookup(RCLASS(tmp)->iv_tbl,id,&value)) {
return value;
}
tmp = RCLASS(tmp)->super;
}
rb_raise(rb_eNameError,"uninitialized class variable %s in %s",
rb_id2name(id), rb_class2name(klass));
return Qnil; /* not reached */
}
VALUE
rb_cvar_defined(klass, id)
VALUE klass;
ID id;
{
VALUE tmp;
tmp = klass;
while (tmp) {
if (RCLASS(tmp)->iv_tbl && st_lookup(RCLASS(tmp)->iv_tbl,id,0)) {
return Qtrue;
}
tmp = RCLASS(tmp)->super;
}
return Qfalse;
}
void
rb_cv_set(klass, name, val)
VALUE klass;
const char *name;
VALUE val;
{
rb_cvar_set(klass, rb_intern(name), val);
}
VALUE
rb_cv_get(klass, name)
VALUE klass;
const char *name;
{
return rb_cvar_get(klass, rb_intern(name));
}
void
rb_define_class_variable(klass, name, val)
VALUE klass;
const char *name;
VALUE val;
{
ID id = rb_intern(name);
if (!rb_is_class_id(id)) {
rb_raise(rb_eNameError, "wrong class variable name %s", name);
}
rb_cvar_declare(klass, id, val);
}
static int
cv_i(key, value, ary)
ID key;
VALUE value;
VALUE ary;
{
if (rb_is_class_id(key)) {
VALUE kval = rb_str_new2(rb_id2name(key));
if (!rb_ary_includes(ary, kval)) {
rb_ary_push(ary, kval);
}
}
return ST_CONTINUE;
}
VALUE
rb_mod_class_variables(obj)
VALUE obj;
{
VALUE ary = rb_ary_new();
if (FL_TEST(obj, FL_SINGLETON)) {
obj = rb_cvar_singleton(rb_iv_get(obj, "__attached__"));
}
for (;;) {
if (RCLASS(obj)->iv_tbl) {
st_foreach(RCLASS(obj)->iv_tbl, cv_i, ary);
}
obj = RCLASS(obj)->super;
if (!obj) break;
}
return ary;
}
VALUE
rb_mod_remove_cvar(mod, name)
VALUE mod, name;
{
ID id = rb_to_id(name);
VALUE val;
if (!rb_is_class_id(id)) {
rb_raise(rb_eNameError, "wrong class variable name %s", name);
}
if (!OBJ_TAINTED(mod) && rb_safe_level() >= 4)
rb_raise(rb_eSecurityError, "Insecure: can't remove class variable");
if (OBJ_FROZEN(mod)) rb_error_frozen("class/module");
if (RCLASS(mod)->iv_tbl && st_delete(ROBJECT(mod)->iv_tbl, &id, &val)) {
return val;
}
if (rb_cvar_defined(mod, id)) {
rb_raise(rb_eNameError, "cannot remove %s for %s",
rb_id2name(id), rb_class2name(mod));
}
rb_raise(rb_eNameError, "class variable %s not defined for %s",
rb_id2name(id), rb_class2name(mod));
return Qnil; /* not reached */
}
VALUE
rb_iv_get(obj, name)
VALUE obj;
const char *name;
{
ID id = rb_intern(name);
return rb_ivar_get(obj, id);
}
VALUE
rb_iv_set(obj, name, val)
VALUE obj;
const char *name;
VALUE val;
{
ID id = rb_intern(name);
return rb_ivar_set(obj, id, val);
}
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