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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) 1993-2003 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"
#include "util.h"
static st_table *rb_global_tbl;
st_table *rb_class_tbl;
static ID autoload, classpath, tmp_classpath;
void
Init_var_tables(void)
{
rb_global_tbl = st_init_numtable();
rb_class_tbl = st_init_numtable();
autoload = rb_intern("__autoload__");
classpath = rb_intern("__classpath__");
tmp_classpath = rb_intern("__tmp_classpath__");
}
struct fc_result {
ID name;
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_str_new2(rb_id2name(name));
while (fc) {
if (fc->track == rb_cObject) break;
if (ROBJECT(fc->track)->iv_tbl &&
st_lookup(ROBJECT(fc->track)->iv_tbl, classpath, &tmp)) {
tmp = rb_str_dup(tmp);
rb_str_cat2(tmp, "::");
rb_str_append(tmp, path);
return tmp;
}
tmp = rb_str_new2(rb_id2name(fc->name));
rb_str_cat2(tmp, "::");
rb_str_append(tmp, path);
path = tmp;
fc = fc->prev;
}
return path;
}
static int
fc_i(ID key, VALUE value, struct fc_result *res)
{
if (!rb_is_const_id(key)) return ST_CONTINUE;
if (value == res->klass) {
res->path = fc_path(res, key);
return ST_STOP;
}
switch (TYPE(value)) {
case T_MODULE:
case T_CLASS:
if (!RCLASS(value)->iv_tbl) return ST_CONTINUE;
else {
struct fc_result arg;
struct fc_result *list;
list = res;
while (list) {
if (list->track == value) return ST_CONTINUE;
list = list->prev;
}
arg.name = key;
arg.path = 0;
arg.klass = res->klass;
arg.track = value;
arg.prev = res;
st_foreach(RCLASS(value)->iv_tbl, fc_i, (st_data_t)&arg);
if (arg.path) {
res->path = arg.path;
return ST_STOP;
}
}
break;
default:
break;
}
return ST_CONTINUE;
}
static VALUE
find_class_path(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_safe(RCLASS(rb_cObject)->iv_tbl, fc_i, (st_data_t)&arg);
}
if (arg.path == 0) {
st_foreach_safe(rb_class_tbl, fc_i, (st_data_t)&arg);
}
if (arg.path) {
if (!ROBJECT(klass)->iv_tbl) {
ROBJECT(klass)->iv_tbl = st_init_numtable();
}
st_insert(ROBJECT(klass)->iv_tbl, classpath, arg.path);
st_delete(RCLASS(klass)->iv_tbl, &tmp_classpath, 0);
return arg.path;
}
return Qnil;
}
static VALUE
classname(VALUE klass)
{
VALUE path = Qnil;
if (!klass) klass = rb_cObject;
if (ROBJECT(klass)->iv_tbl) {
if (!st_lookup(ROBJECT(klass)->iv_tbl, classpath, &path)) {
ID classid = rb_intern("__classid__");
if (!st_lookup(ROBJECT(klass)->iv_tbl, classid, &path)) {
return find_class_path(klass);
}
path = rb_str_new2(rb_id2name(SYM2ID(path)));
st_insert(ROBJECT(klass)->iv_tbl, classpath, path);
st_delete(RCLASS(klass)->iv_tbl, (st_data_t*)&classid, 0);
}
if (TYPE(path) != T_STRING) {
rb_bug("class path is not set properly");
}
return path;
}
return find_class_path(klass);
}
/*
* call-seq:
* mod.name => string
*
* Returns the name of the module <i>mod</i>.
*/
VALUE
rb_mod_name(VALUE mod)
{
VALUE path = classname(mod);
if (!NIL_P(path)) return rb_str_dup(path);
return rb_str_new(0,0);
}
VALUE
rb_class_path(VALUE klass)
{
VALUE path = classname(klass);
if (!NIL_P(path)) return path;
if (RCLASS(klass)->iv_tbl && st_lookup(RCLASS(klass)->iv_tbl,
tmp_classpath, &path)) {
return path;
}
else {
const char *s = "Class";
if (TYPE(klass) == T_MODULE) {
if (rb_obj_class(klass) == rb_cModule) {
s = "Module";
}
else {
s = rb_class2name(RBASIC(klass)->klass);
}
}
path = rb_sprintf("#<%s:%p>", s, klass);
rb_ivar_set(klass, tmp_classpath, path);
return path;
}
}
void
rb_set_class_path(VALUE klass, VALUE 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_ivar_set(klass, classpath, str);
}
VALUE
rb_path2class(const char *path)
{
const char *pbeg, *p;
ID id;
VALUE c = rb_cObject;
if (path[0] == '#') {
rb_raise(rb_eArgError, "can't retrieve anonymous class %s", path);
}
pbeg = p = path;
while (*p) {
VALUE str;
while (*p && *p != ':') p++;
str = rb_str_new(pbeg, p-pbeg);
id = rb_intern(RSTRING(str)->ptr);
if (p[0] == ':') {
if (p[1] != ':') goto undefined_class;
p += 2;
pbeg = p;
}
if (!rb_const_defined(c, id)) {
undefined_class:
rb_raise(rb_eArgError, "undefined class/module %.*s", p-path, path);
}
c = rb_const_get_at(c, id);
switch (TYPE(c)) {
case T_MODULE:
case T_CLASS:
break;
default:
rb_raise(rb_eTypeError, "%s does not refer class/module", path);
}
}
return c;
}
void
rb_name_class(VALUE klass, ID id)
{
rb_iv_set(klass, "__classid__", ID2SYM(id));
}
VALUE
rb_class_name(VALUE klass)
{
return rb_class_path(rb_class_real(klass));
}
char *
rb_class2name(VALUE klass)
{
return RSTRING(rb_class_name(klass))->ptr;
}
char *
rb_obj_classname(VALUE obj)
{
return rb_class2name(CLASS_OF(obj));
}
struct trace_var {
int removed;
void (*func)();
VALUE data;
struct trace_var *next;
};
struct global_variable {
int counter;
void *data;
VALUE (*getter)();
void (*setter)();
void (*marker)();
int block_trace;
struct trace_var *trace;
};
struct global_entry {
struct global_variable *var;
ID id;
};
static VALUE undef_getter(ID id);
static void undef_setter(VALUE val, ID id, void *data, struct global_variable *var);
static void undef_marker(void);
static VALUE val_getter(ID id, VALUE val);
static void val_setter(VALUE val, ID id, void *data, struct global_variable *var);
static void val_marker(VALUE data);
static VALUE var_getter(ID id, VALUE *var);
static void var_setter(VALUE val, ID id, VALUE *var);
static void var_marker(VALUE *var);
struct global_entry*
rb_global_entry(ID id)
{
struct global_entry *entry;
if (!st_lookup(rb_global_tbl, id, (st_data_t *)&entry)) {
struct global_variable *var;
entry = ALLOC(struct global_entry);
var = ALLOC(struct global_variable);
entry->id = id;
entry->var = var;
var->counter = 1;
var->data = 0;
var->getter = undef_getter;
var->setter = undef_setter;
var->marker = undef_marker;
var->block_trace = 0;
var->trace = 0;
st_add_direct(rb_global_tbl, id, (st_data_t)entry);
}
return entry;
}
static VALUE
undef_getter(ID id)
{
rb_warning("global variable `%s' not initialized", rb_id2name(id));
return Qnil;
}
static void
undef_setter(VALUE val, ID id, void *data, struct global_variable *var)
{
var->getter = val_getter;
var->setter = val_setter;
var->marker = val_marker;
var->data = (void*)val;
}
static void
undef_marker(void)
{
}
static VALUE
val_getter(ID id, VALUE val)
{
return val;
}
static void
val_setter(VALUE val, ID id, void *data, struct global_variable *var)
{
var->data = (void*)val;
}
static void
val_marker(VALUE data)
{
if (data) rb_gc_mark_maybe(data);
}
static VALUE
var_getter(ID id, VALUE *var)
{
if (!var) return Qnil;
return *var;
}
static void
var_setter(VALUE val, ID id, VALUE *var)
{
*var = val;
}
static void
var_marker(VALUE *var)
{
if (var) rb_gc_mark_maybe(*var);
}
static void
readonly_setter(VALUE val, ID id, void *var)
{
rb_name_error(id, "%s is a read-only variable", rb_id2name(id));
}
static int
mark_global_entry(ID key, struct global_entry *entry)
{
struct trace_var *trace;
struct 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 ST_CONTINUE;
}
void
rb_gc_mark_global_tbl(void)
{
if (rb_global_tbl) {
st_foreach(rb_global_tbl, mark_global_entry, 0);
}
}
static ID
global_id(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(
const char *name,
VALUE *var,
VALUE (*getter)(ANYARGS),
void (*setter)(ANYARGS))
{
struct global_variable *gvar;
ID id = global_id(name);
gvar = rb_global_entry(id)->var;
gvar->data = (void*)var;
gvar->getter = getter?getter:var_getter;
gvar->setter = setter?setter:var_setter;
gvar->marker = var_marker;
}
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, VALUE *var)
{
rb_define_hooked_variable(name, var, 0, readonly_setter);
}
void
rb_define_virtual_variable(
const char *name,
VALUE (*getter)(ANYARGS),
void (*setter)(ANYARGS))
{
if (!getter) getter = val_getter;
if (!setter) setter = 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, VALUE *argv)
{
VALUE var, cmd;
struct global_entry *entry;
struct trace_var *trace;
rb_secure(4);
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 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;
free(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, 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, (st_data_t *)&entry)) {
rb_name_error(id, "undefined global variable %s", rb_id2name(id));
}
trace = entry->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 global_entry *entry)
{
struct 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; /* not reached */
}
static VALUE
trace_en(struct global_variable *var)
{
var->block_trace = 0;
remove_trace(var);
return Qnil; /* not reached */
}
VALUE
rb_gvar_set(struct global_entry *entry, VALUE val)
{
struct trace_data trace;
struct global_variable *var = entry->var;
if (rb_safe_level() >= 4)
rb_raise(rb_eSecurityError, "Insecure: can't change global variable value");
(*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 global_entry *entry;
entry = rb_global_entry(global_id(name));
return rb_gvar_set(entry, val);
}
VALUE
rb_gv_get(const char *name)
{
struct global_entry *entry;
entry = rb_global_entry(global_id(name));
return rb_gvar_get(entry);
}
VALUE
rb_gvar_defined(struct global_entry *entry)
{
if (entry->var->getter == undef_getter) return Qfalse;
return Qtrue;
}
static int
gvar_i(ID key, struct global_entry *entry, VALUE ary)
{
rb_ary_push(ary, rb_str_new2(rb_id2name(key)));
return ST_CONTINUE;
}
/*
* call-seq:
* global_variables => array
*
* Returns an array of the names of global variables.
*
* global_variables.grep /std/ #=> ["$stderr", "$stdout", "$stdin"]
*/
VALUE
rb_f_global_variables(void)
{
VALUE ary = rb_ary_new();
char buf[4];
const char *s = "&`'+123456789";
st_foreach_safe(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(ID name1, ID name2)
{
struct global_entry *entry1, *entry2;
if (rb_safe_level() >= 4)
rb_raise(rb_eSecurityError, "Insecure: can't alias global variable");
entry2 = rb_global_entry(name2);
if (!st_lookup(rb_global_tbl, name1, (st_data_t *)&entry1)) {
entry1 = ALLOC(struct global_entry);
entry1->id = name1;
st_add_direct(rb_global_tbl, name1, (st_data_t)entry1);
}
else if (entry1->var != entry2->var) {
struct 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;
free(trace);
trace = next;
}
free(var);
}
}
else {
return;
}
entry2->var->counter++;
entry1->var = entry2->var;
}
static int special_generic_ivar = 0;
static st_table *generic_iv_tbl;
st_table*
rb_generic_ivar_table(VALUE obj)
{
st_table *tbl;
if (!FL_TEST(obj, FL_EXIVAR)) return 0;
if (!generic_iv_tbl) return 0;
if (!st_lookup(generic_iv_tbl, obj, (st_data_t *)&tbl)) return 0;
return tbl;
}
static VALUE
generic_ivar_get(VALUE obj, ID id, int warn)
{
st_table *tbl;
VALUE val;
if (generic_iv_tbl) {
if (st_lookup(generic_iv_tbl, obj, (st_data_t *)&tbl)) {
if (st_lookup(tbl, id, &val)) {
return val;
}
}
}
if (warn) {
rb_warning("instance variable %s not initialized", rb_id2name(id));
}
return Qnil;
}
static void
generic_ivar_set(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, (st_data_t *)&tbl)) {
FL_SET(obj, FL_EXIVAR);
tbl = st_init_numtable();
st_add_direct(generic_iv_tbl, obj, (st_data_t)tbl);
st_add_direct(tbl, id, val);
return;
}
st_insert(tbl, id, val);
}
static VALUE
generic_ivar_defined(VALUE obj, ID id)
{
st_table *tbl;
VALUE val;
if (!generic_iv_tbl) return Qfalse;
if (!st_lookup(generic_iv_tbl, obj, (st_data_t *)&tbl)) return Qfalse;
if (st_lookup(tbl, id, &val)) {
return Qtrue;
}
return Qfalse;
}
static int
generic_ivar_remove(VALUE obj, ID id, VALUE *valp)
{
st_table *tbl;
int status;
if (!generic_iv_tbl) return 0;
if (!st_lookup(generic_iv_tbl, obj, (st_data_t *)&tbl)) return 0;
status = st_delete(tbl, &id, valp);
if (tbl->num_entries == 0) {
st_delete(generic_iv_tbl, &obj, (st_data_t *)&tbl);
st_free_table(tbl);
}
return status;
}
void
rb_mark_generic_ivar(VALUE obj)
{
st_table *tbl;
if (!generic_iv_tbl) return;
if (st_lookup(generic_iv_tbl, obj, (st_data_t *)&tbl)) {
rb_mark_tbl(tbl);
}
}
static int
givar_mark_i(ID key, VALUE value)
{
rb_gc_mark(value);
return ST_CONTINUE;
}
static int
givar_i(VALUE obj, st_table *tbl)
{
if (rb_special_const_p(obj)) {
st_foreach_safe(tbl, givar_mark_i, 0);
}
return ST_CONTINUE;
}
void
rb_mark_generic_ivar_tbl(void)
{
if (!generic_iv_tbl) return;
if (special_generic_ivar == 0) return;
st_foreach_safe(generic_iv_tbl, givar_i, 0);
}
void
rb_free_generic_ivar(VALUE obj)
{
st_table *tbl;
if (!generic_iv_tbl) return;
if (st_delete(generic_iv_tbl, &obj, (st_data_t *)&tbl))
st_free_table(tbl);
}
void
rb_copy_generic_ivar(VALUE clone, VALUE obj)
{
st_table *tbl;
if (!generic_iv_tbl) return;
if (!FL_TEST(obj, FL_EXIVAR)) return;
if (st_lookup(generic_iv_tbl, obj, (st_data_t *)&tbl)) {
st_table *old;
if (st_lookup(generic_iv_tbl, clone, (st_data_t *)&old)) {
st_free_table(old);
st_insert(generic_iv_tbl, clone, (st_data_t)st_copy(tbl));
}
else {
st_add_direct(generic_iv_tbl, clone, (st_data_t)st_copy(tbl));
FL_SET(clone, FL_EXIVAR);
}
}
}
static VALUE
ivar_get(VALUE obj, ID id, int warn)
{
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, warn);
break;
}
if (warn) {
rb_warning("instance variable %s not initialized", rb_id2name(id));
}
return Qnil;
}
VALUE
rb_ivar_get(VALUE obj, ID id)
{
return ivar_get(obj, id, Qtrue);
}
VALUE
rb_attr_get(VALUE obj, ID id)
{
return ivar_get(obj, id, Qfalse);
}
VALUE
rb_ivar_set(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(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(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;
}
/*
* 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();
switch (TYPE(obj)) {
case T_OBJECT:
case T_CLASS:
case T_MODULE:
if (ROBJECT(obj)->iv_tbl) {
st_foreach_safe(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, (st_data_t *)&tbl)) {
st_foreach_safe(tbl, ivar_i, ary);
}
}
break;
}
return ary;
}
/*
* 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;
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_name_error(id, "`%s' is not allowed as an instance variable name", 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, (st_data_t*)&id, &val)) {
return val;
}
break;
default:
if (FL_TEST(obj, FL_EXIVAR) || rb_special_const_p(obj)) {
if (generic_ivar_remove(obj, id, &val)) {
return val;
}
}
break;
}
rb_name_error(id, "instance variable %s not defined", rb_id2name(id));
return Qnil; /* not reached */
}
NORETURN(static void uninitialized_constant(VALUE, ID));
static void
uninitialized_constant(VALUE klass, ID id)
{
if (klass && klass != rb_cObject)
rb_name_error(id, "uninitialized constant %s::%s",
rb_class2name(klass),
rb_id2name(id));
else {
rb_name_error(id, "uninitialized constant %s", rb_id2name(id));
}
}
static VALUE
const_missing(VALUE klass, ID id)
{
return rb_funcall(klass, rb_intern("const_missing"), 1, ID2SYM(id));
}
/*
* 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 a (very bad) example: if 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
* value of the loaded class. It therefore implements a perverse
* kind of autoload facility.
*
* 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)
{
ruby_frame = ruby_frame->prev; /* pop frame for "const_missing" */
uninitialized_constant(klass, rb_to_id(name));
return Qnil; /* not reached */
}
static struct st_table *
check_autoload_table(VALUE av)
{
Check_Type(av, T_DATA);
if (RDATA(av)->dmark != (RUBY_DATA_FUNC)rb_mark_tbl ||
RDATA(av)->dfree != (RUBY_DATA_FUNC)st_free_table) {
rb_raise(rb_eTypeError, "wrong autoload table: %s", RSTRING(rb_inspect(av))->ptr);
}
return (struct st_table *)DATA_PTR(av);
}
void
rb_autoload(VALUE mod, ID id, const char *file)
{
VALUE av, fn;
struct st_table *tbl;
if (!rb_is_const_id(id)) {
rb_raise(rb_eNameError, "autoload must be constant name: %s", rb_id2name(id));
}
if (!file || !*file) {
rb_raise(rb_eArgError, "empty file name");
}
if ((tbl = RCLASS(mod)->iv_tbl) && st_lookup(tbl, id, &av) && av != Qundef)
return;
rb_const_set(mod, id, Qundef);
tbl = RCLASS(mod)->iv_tbl;
if (st_lookup(tbl, autoload, &av)) {
tbl = check_autoload_table(av);
}
else {
av = Data_Wrap_Struct(0, rb_mark_tbl, st_free_table, 0);
st_add_direct(tbl, autoload, av);
DATA_PTR(av) = tbl = st_init_numtable();
}
fn = rb_str_new2(file);
FL_UNSET(fn, FL_TAINT);
OBJ_FREEZE(fn);
st_insert(tbl, id, (st_data_t)rb_node_newnode(NODE_MEMO, fn, ruby_safe_level, 0));
}
static NODE*
autoload_delete(VALUE mod, ID id)
{
VALUE val;
st_data_t load = 0;
st_delete(RCLASS(mod)->iv_tbl, (st_data_t*)&id, 0);
if (st_lookup(RCLASS(mod)->iv_tbl, autoload, &val)) {
struct st_table *tbl = check_autoload_table(val);
st_delete(tbl, (st_data_t*)&id, &load);
if (tbl->num_entries == 0) {
DATA_PTR(val) = 0;
st_free_table(tbl);
id = autoload;
if (st_delete(RCLASS(mod)->iv_tbl, (st_data_t*)&id, &val)) {
rb_gc_force_recycle(val);
}
}
}
return (NODE *)load;
}
VALUE
rb_autoload_load(VALUE klass, ID id)
{
VALUE file;
NODE *load = autoload_delete(klass, id);
if (!load || !(file = load->nd_lit) || rb_provided(RSTRING(file)->ptr)) {
return Qfalse;
}
return rb_require_safe(file, load->nd_nth);
}
static VALUE
autoload_file(VALUE mod, ID id)
{
VALUE val, file;
struct st_table *tbl;
st_data_t load;
if (!st_lookup(RCLASS(mod)->iv_tbl, autoload, &val) ||
!(tbl = check_autoload_table(val)) || !st_lookup(tbl, id, &load)) {
return Qnil;
}
file = ((NODE *)load)->nd_lit;
Check_Type(file, T_STRING);
if (!RSTRING(file)->ptr) {
rb_raise(rb_eArgError, "empty file name");
}
if (!rb_provided(RSTRING(file)->ptr)) {
return file;
}
/* already loaded but not defined */
st_delete(tbl, (st_data_t*)&id, 0);
if (!tbl->num_entries) {
DATA_PTR(val) = 0;
st_free_table(tbl);
id = autoload;
if (st_delete(RCLASS(mod)->iv_tbl, (st_data_t*)&id, &val)) {
rb_gc_force_recycle(val);
}
}
return Qnil;
}
VALUE
rb_autoload_p(VALUE mod, ID id)
{
struct st_table *tbl = RCLASS(mod)->iv_tbl;
VALUE val;
if (!tbl || !st_lookup(tbl, id, &val) || val != Qundef) {
return Qnil;
}
return autoload_file(mod, id);
}
static VALUE
rb_const_get_0(VALUE klass, ID id, int exclude, int recurse, NODE *fallback)
{
VALUE value, tmp;
int n_retry = 0;
tmp = klass;
retry:
while (tmp && !NIL_P(tmp)) {
while (RCLASS(tmp)->iv_tbl && st_lookup(RCLASS(tmp)->iv_tbl,id,&value)) {
if (value == Qundef) {
if (!RTEST(rb_autoload_load(tmp, id))) break;
continue;
}
if (exclude && tmp == rb_cObject && klass != rb_cObject) {
rb_warn("toplevel constant %s referenced by %s::%s",
rb_id2name(id), rb_class2name(klass), rb_id2name(id));
}
return value;
}
if (!recurse) break;
tmp = RCLASS(tmp)->super;
if (tmp == rb_cObject) break;
if (ruby_wrapper && tmp && RBASIC(tmp)->klass == ruby_wrapper) {
tmp = RCLASS(tmp)->super;
}
}
if (recurse) {
if (fallback) {
tmp = fallback->nd_clss;
fallback = fallback->nd_next;
goto retry;
}
if (!n_retry) {
n_retry = 1;
tmp = rb_cObject;
goto retry;
}
}
return const_missing(klass, id);
}
VALUE
rb_const_get_from(VALUE klass, ID id)
{
return rb_const_get_0(klass, id, Qtrue, Qtrue, 0);
}
VALUE
rb_const_get(VALUE klass, ID id)
{
return rb_const_get_0(klass, id, Qfalse, Qtrue, 0);
}
VALUE
rb_const_get_at(VALUE klass, ID id)
{
return rb_const_get_0(klass, id, Qtrue, Qfalse, 0);
}
VALUE
rb_const_get_fallback(VALUE klass, ID id, NODE *fallback)
{
return rb_const_get_0(klass, id, Qfalse, Qtrue, fallback);
}
/*
* call-seq:
* remove_const(sym) => obj
*
* Removes the definition of the given constant, returning that
* constant's value. Predefined classes and singleton objects (such as
* <i>true</i>) cannot be removed.
*/
VALUE
rb_mod_remove_const(VALUE mod, VALUE name)
{
ID id = rb_to_id(name);
VALUE val;
if (!rb_is_const_id(id)) {
rb_name_error(id, "`%s' is not allowed as a constant name", 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, (st_data_t*)&id, &val)) {
if (val == Qundef) {
autoload_delete(mod, id);
val = Qnil;
}
return val;
}
if (rb_const_defined_at(mod, id)) {
rb_name_error(id, "cannot remove %s::%s",
rb_class2name(mod), rb_id2name(id));
}
rb_name_error(id, "constant %s::%s not defined",
rb_class2name(mod), rb_id2name(id));
return Qnil; /* not reached */
}
static int
sv_i(ID key, VALUE value, st_table *tbl)
{
if (rb_is_const_id(key)) {
if (!st_lookup(tbl, key, 0)) {
st_insert(tbl, key, key);
}
}
return ST_CONTINUE;
}
void*
rb_mod_const_at(VALUE mod, void *data)
{
st_table *tbl = data;
if (!tbl) {
tbl = st_init_numtable();
}
if (RCLASS(mod)->iv_tbl) {
st_foreach_safe(RCLASS(mod)->iv_tbl, sv_i, (st_data_t)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(tmp)->super;
if (!tmp) break;
if (tmp == rb_cObject && mod != rb_cObject) break;
}
return data;
}
static int
list_i(ID key, ID value, VALUE ary)
{
rb_ary_push(ary, rb_str_new2(rb_id2name(key)));
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 => 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).
*/
VALUE
rb_mod_constants(VALUE mod)
{
return rb_const_list(rb_mod_const_of(mod, 0));
}
static int
rb_const_defined_0(VALUE klass, ID id, int exclude, int recurse, NODE* fallback)
{
VALUE value, tmp;
int n_retry = 0;
tmp = klass;
retry:
while (tmp) {
if (RCLASS(tmp)->iv_tbl && st_lookup(RCLASS(tmp)->iv_tbl, id, &value)) {
if (value == Qundef && NIL_P(autoload_file(klass, id)))
return Qfalse;
return Qtrue;
}
if (!recurse) break;
tmp = RCLASS(tmp)->super;
}
if (recurse) {
if (fallback) {
tmp = fallback->nd_clss;
fallback = fallback->nd_next;
goto retry;
}
if (!n_retry) {
n_retry = 1;
tmp = rb_cObject;
goto retry;
}
}
return Qfalse;
}
int
rb_const_defined_from(VALUE klass, ID id)
{
return rb_const_defined_0(klass, id, Qtrue, Qtrue, 0);
}
int
rb_const_defined(VALUE klass, ID id)
{
return rb_const_defined_0(klass, id, Qfalse, Qtrue, 0);
}
int
rb_const_defined_at(VALUE klass, ID id)
{
return rb_const_defined_0(klass, id, Qtrue, Qfalse, 0);
}
int
rb_const_defined_fallback(VALUE klass, ID id, NODE *fallback)
{
return rb_const_defined_0(klass, id, Qfalse, Qtrue, fallback);
}
static void
mod_av_set(VALUE klass, ID id, VALUE val, int isconst)
{
const 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)) {
if (BUILTIN_TYPE(klass) == T_MODULE) {
rb_error_frozen("module");
}
else {
rb_error_frozen("class");
}
}
if (!RCLASS(klass)->iv_tbl) {
RCLASS(klass)->iv_tbl = st_init_numtable();
}
else if (isconst) {
VALUE value = Qfalse;
if (st_lookup(RCLASS(klass)->iv_tbl, id, &value)) {
if (value == Qundef)
autoload_delete(klass, id);
else
rb_warn("already initialized %s %s", dest, rb_id2name(id));
}
}
st_insert(RCLASS(klass)->iv_tbl, id, val);
}
void
rb_const_set(VALUE klass, ID id, VALUE val)
{
if (NIL_P(klass)) {
rb_raise(rb_eTypeError, "no class/module to define constant %s",
rb_id2name(id));
}
mod_av_set(klass, id, val, Qtrue);
}
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: invalide name `%s' for constant", name);
}
if (klass == rb_cObject) {
rb_secure(4);
}
rb_const_set(klass, id, val);
}
void
rb_define_global_const(const char *name, VALUE val)
{
rb_define_const(rb_cObject, name, val);
}
void
rb_cvar_set(VALUE klass, ID id, VALUE val, int warn)
{
mod_av_set(klass, id, val, Qfalse);
}
VALUE
rb_cvar_get(VALUE klass, ID id)
{
VALUE value;
if (RCLASS(klass)->iv_tbl && st_lookup(RCLASS(klass)->iv_tbl,id,&value)) {
return value;
}
rb_name_error(id,"uninitialized class variable %s in %s",
rb_id2name(id), rb_class2name(klass));
return Qnil; /* not reached */
}
VALUE
rb_cvar_defined(VALUE klass, ID id)
{
if (RCLASS(klass)->iv_tbl && st_lookup(RCLASS(klass)->iv_tbl,id,0)) {
return Qtrue;
}
return Qfalse;
}
void
rb_cv_set(VALUE klass, const char *name, VALUE val)
{
ID id = rb_intern(name);
if (!rb_is_class_id(id)) {
rb_name_error(id, "wrong class variable name %s", name);
}
rb_cvar_set(klass, id, val, Qfalse);
}
VALUE
rb_cv_get(VALUE klass, const char *name)
{
ID id = rb_intern(name);
if (!rb_is_class_id(id)) {
rb_name_error(id, "wrong class variable name %s", name);
}
return rb_cvar_get(klass, id);
}
void
rb_define_class_variable(VALUE klass, const char *name, VALUE val)
{
ID id = rb_intern(name);
if (!rb_is_class_id(id)) {
rb_name_error(id, "wrong class variable name %s", name);
}
rb_cvar_set(klass, id, val, Qtrue);
}
static int
cv_i(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;
}
/*
* call-seq:
* mod.class_variables => array
*
* Returns an array of the names of class variables in <i>mod</i>.
*
* class One
* @@var1 = 1
* end
* class Two < One
* @@var2 = 2
* end
* One.class_variables #=> ["@@var1"]
* Two.class_variables #=> ["@@var2"]
*/
VALUE
rb_mod_class_variables(VALUE obj)
{
VALUE ary = rb_ary_new();
if (RCLASS(obj)->iv_tbl) {
st_foreach_safe(RCLASS(obj)->iv_tbl, cv_i, ary);
}
return ary;
}
/*
* 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)
* puts(defined? @@var)
* end
*
* <em>produces:</em>
*
* 99
* nil
*/
VALUE
rb_mod_remove_cvar(VALUE mod, VALUE name)
{
ID id = rb_to_id(name);
VALUE val;
if (!rb_is_class_id(id)) {
rb_name_error(id, "wrong class variable name %s", rb_id2name(id));
}
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, (st_data_t*)&id, &val)) {
return val;
}
if (rb_cvar_defined(mod, id)) {
rb_name_error(id, "cannot remove %s for %s",
rb_id2name(id), rb_class2name(mod));
}
rb_name_error(id, "class variable %s not defined for %s",
rb_id2name(id), rb_class2name(mod));
return Qnil; /* not reached */
}
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);
}
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