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ruby--ruby/variable.c
normal 7bbff60485 variable.c: fix autoload stack space regression 
r61560 ("offsetof(type, foo.bar) is (arguably) a GCCism")
introduced 16 bytes of stack overhead on 64-bit systems.
Remove that overhead and cast, instead.  While we're at it,
restore the "waitq" name to clarify the purpose of the field.

(This is one unfortunate consequence of the CC0 ccan/list.h
 implementation compared to the *GPL ones in glibc/urcu/linux)

* variable.c (struct autoload_state): remove head field, clarify naming
  (autoload_reset): cast and adjust
  (autoload_sleep_done): ditto
  (rb_autoload_load): ditto

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61574 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2018-01-02 21:51:59 +00:00

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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"
#include "debug_counter.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 VALUE rb_const_search(VALUE klass, ID id, int exclude, int recurse, int visibility);
static st_table *generic_iv_tbl;
static st_table *generic_iv_tbl_compat;
/* per-object */
struct gen_ivtbl {
uint32_t numiv;
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;
st_data_t n;
if (!RCLASS_EXT(klass)) return Qnil;
if (!(ivtbl = RCLASS_IV_TBL(klass))) 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, *pend, *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;
pend = path + RSTRING_LEN(pathname);
if (path == pend || path[0] == '#') {
rb_raise(rb_eArgError, "can't retrieve anonymous class %"PRIsVALUE,
QUOTE(pathname));
}
while (p < pend) {
while (p < pend && *p != ':') p++;
id = rb_check_id_cstr(pbeg, p-pbeg, enc);
if (p < pend && p[0] == ':') {
if ((size_t)(pend - p) < 2 || p[1] != ':') goto undefined_class;
p += 2;
pbeg = p;
}
if (!id) {
undefined_class:
rb_raise(rb_eArgError, "undefined class/module % "PRIsVALUE,
rb_str_subseq(pathname, 0, p-path));
}
c = rb_const_search(c, id, TRUE, FALSE, FALSE);
if (c == Qundef) goto undefined_class;
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;
}
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;
}
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 (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 (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, uint32_t n)
{
uint32_t 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 uint32_t
iv_index_tbl_newsize(struct ivar_update *ivup)
{
uint32_t index = (uint32_t)ivup->index; /* should not overflow */
uint32_t newsize = (index+1) + (index+1)/4; /* (index+1)*1.25 */
if (!ivup->iv_extended &&
ivup->u.iv_index_tbl->num_entries < (st_index_t)newsize) {
newsize = (uint32_t)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;
uint32_t newsize;
int ret = ST_CONTINUE;
struct gen_ivtbl *ivtbl;
if (existing) {
ivtbl = (struct gen_ivtbl *)*v;
if (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 ((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 (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)
{
uint32_t 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)
{
uint32_t 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;
uint32_t 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 <= 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);
RB_DEBUG_COUNTER_INC(ivar_get_base);
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;
uint32_t 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 <= 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;
uint32_t i, len;
RB_DEBUG_COUNTER_INC(ivar_set_base);
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 <= 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;
uint32_t 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) <= 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 (index < ROBJECT_NUMIV(data->obj)) {
VALUE val = ROBJECT_IVPTR(data->obj)[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 (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 (ivup.index >= c->ivtbl->numiv) {
uint32_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;
uint32_t 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 = ROBJECT_NUMIV(obj);
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$s' is not allowed as "#part" "#type" variable name")
#define id_for_var_message(obj, name, type, message) \
check_id_type(obj, &(name), rb_is_##type##_id, rb_is_##type##_name, message, strlen(message))
static ID
check_id_type(VALUE obj, VALUE *pname,
int (*valid_id_p)(ID), int (*valid_name_p)(VALUE),
const char *message, size_t message_len)
{
ID id = rb_check_id(pname);
VALUE name = *pname;
if (id ? !valid_id_p(id) : !valid_name_p(name)) {
rb_name_err_raise_str(rb_fstring_new(message, message_len),
obj, name);
}
return id;
}
/*
* call-seq:
* obj.remove_instance_variable(symbol) -> obj
*
* Removes the named instance variable from <i>obj</i>, returning that
* variable's value.
*
* class Dummy
* attr_reader :var
* def initialize
* @var = 99
* end
* def remove
* remove_instance_variable(:@var)
* end
* end
* d = Dummy.new
* d.var #=> 99
* d.remove #=> 99
* d.var #=> nil
*/
VALUE
rb_obj_remove_instance_variable(VALUE obj, VALUE name)
{
VALUE val = Qnil;
const ID id = id_for_var(obj, name, an, instance);
st_data_t n, v;
struct st_table *iv_index_tbl;
st_data_t index;
rb_check_frozen(obj);
if (!id) {
goto not_defined;
}
switch (BUILTIN_TYPE(obj)) {
case T_OBJECT:
iv_index_tbl = ROBJECT_IV_INDEX_TBL(obj);
if (!iv_index_tbl) break;
if (!st_lookup(iv_index_tbl, (st_data_t)id, &index)) break;
if (ROBJECT_NUMIV(obj) <= index) break;
val = ROBJECT_IVPTR(obj)[index];
if (val != Qundef) {
ROBJECT_IVPTR(obj)[index] = Qundef;
return val;
}
break;
case T_CLASS:
case T_MODULE:
n = id;
if (RCLASS_IV_TBL(obj) && st_delete(RCLASS_IV_TBL(obj), &n, &v)) {
return (VALUE)v;
}
break;
default:
if (FL_TEST(obj, FL_EXIVAR)) {
if (generic_ivar_remove(obj, id, &val)) {
return val;
}
}
break;
}
not_defined:
rb_name_err_raise("instance variable %1$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;
struct list_node 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)
RUBY_FUNC_EXPORTED 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_LEN(file) || !*RSTRING_PTR(file)) {
rb_raise(rb_eArgError, "empty file name");
}
/*
* if somebody else is autoloading, we MUST wait for them, since
* rb_provide_feature can provide a feature before autoload_const_set
* completes. We must wait until autoload_const_set finishes in
* the other thread.
*/
if (ele->state && ele->state->thread != rb_thread_current()) {
return load;
}
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((struct list_head *)&state->waitq, cur, nxt, waitq) {
VALUE th = cur->thread;
cur->thread = Qfalse;
list_del_init(&cur->waitq); /* idempotent */
/*
* 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 */
}
static VALUE
autoload_sleep(VALUE arg)
{
struct autoload_state *state = (struct autoload_state *)arg;
/*
* autoload_reset in other thread will resume us and remove us
* from the waitq list
*/
do {
rb_thread_sleep_deadly();
} while (state->thread != Qfalse);
return Qfalse;
}
static VALUE
autoload_sleep_done(VALUE arg)
{
struct autoload_state *state = (struct autoload_state *)arg;
if (state->thread != Qfalse && rb_thread_to_be_killed(state->thread)) {
list_del(&state->waitq); /* idempotent after list_del_init */
}
return Qfalse;
}
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((struct list_head *)&state.waitq);
}
else if (state.thread == ele->state->thread) {
return Qfalse;
}
else {
list_add_tail((struct list_head *)&ele->state->waitq, &state.waitq);
rb_ensure(autoload_sleep, (VALUE)&state,
autoload_sleep_done, (VALUE)&state);
}
/* 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;
}
void
rb_const_warn_if_deprecated(const rb_const_entry_t *ce, VALUE klass, ID 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));
}
}
}
static VALUE
rb_const_get_0(VALUE klass, ID id, int exclude, int recurse, int visibility)
{
VALUE c = rb_const_search(klass, id, exclude, recurse, visibility);
if (c != Qundef) return c;
return rb_const_missing(klass, ID2SYM(id));
}
static VALUE
rb_const_search(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$s referenced",
tmp, ID2SYM(id));
}
rb_const_warn_if_deprecated(ce, tmp, id);
value = ce->value;
if (value == Qundef) {
if (am == tmp) break;
am = tmp;
if (rb_autoloading_value(tmp, id, &av)) return av;
rb_autoload_load(tmp, id);
continue;
}
if (exclude && tmp == rb_cObject && klass != rb_cObject) {
#if 0
rb_warn("toplevel constant %"PRIsVALUE" referenced by %"PRIsVALUE"::%"PRIsVALUE"",
QUOTE_ID(id), rb_class_name(klass), QUOTE_ID(id));
#else
return Qundef;
#endif
}
return value;
}
if (!recurse) break;
tmp = RCLASS_SUPER(tmp);
}
if (!exclude && !mod_retry && BUILTIN_TYPE(klass) == T_MODULE) {
mod_retry = 1;
tmp = rb_cObject;
goto retry;
}
return Qundef;
}
VALUE
rb_const_get_from(VALUE klass, ID id)
{
return rb_const_get_0(klass, id, TRUE, TRUE, FALSE);
}
VALUE
rb_const_get(VALUE klass, ID id)
{
return rb_const_get_0(klass, id, FALSE, TRUE, FALSE);
}
VALUE
rb_const_get_at(VALUE klass, ID id)
{
return rb_const_get_0(klass, id, TRUE, FALSE, FALSE);
}
VALUE
rb_public_const_get_from(VALUE klass, ID id)
{
return rb_const_get_0(klass, id, TRUE, TRUE, TRUE);
}
VALUE
rb_public_const_get(VALUE klass, ID id)
{
return rb_const_get_0(klass, id, FALSE, TRUE, TRUE);
}
VALUE
rb_public_const_get_at(VALUE klass, ID id)
{
return rb_const_get_0(klass, id, TRUE, FALSE, TRUE);
}
/*
* call-seq:
* remove_const(sym) -> obj
*
* Removes the definition of the given constant, returning that
* constant's previous value. If that constant referred to
* a module, this will not change that module's name and can lead
* to confusion.
*/
VALUE
rb_mod_remove_const(VALUE mod, VALUE name)
{
const ID id = id_for_var(mod, name, a, constant);
if (!id) {
rb_name_err_raise("constant %2$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)
{
if (rb_is_const_id(const_name) && !RB_CONST_PRIVATE_P((rb_const_entry_t *)const_value)) {
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))) {
if (NIL_P(rb_class_path_cached(val))) {
if (klass == rb_cObject) {
rb_ivar_set(val, classpath, rb_id2str(id));
rb_name_class(val, id);
}
else {
VALUE path;
ID pathid;
st_data_t n;
st_table *ivtbl = RCLASS_IV_TBL(klass);
if (ivtbl &&
(st_lookup(ivtbl, (st_data_t)(pathid = classpath), &n) ||
st_lookup(ivtbl, (st_data_t)(pathid = tmp_classpath), &n))) {
path = rb_str_dup((VALUE)n);
rb_str_append(rb_str_cat2(path, "::"), rb_id2str(id));
OBJ_FREEZE(path);
rb_ivar_set(val, pathid, path);
rb_name_class(val, id);
}
}
}
}
}
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$s not defined",
mod, ID2SYM(id));
}
}
rb_clear_constant_cache();
}
void
rb_deprecate_constant(VALUE mod, const char *name)
{
rb_const_entry_t *ce;
ID id;
long len = strlen(name);
rb_frozen_class_p(mod);
if (!(id = rb_check_id_cstr(name, len, NULL)) ||
!(ce = rb_const_lookup(mod, id))) {
rb_name_err_raise("constant %2$s::%1$s not defined",
mod, rb_fstring_new(name, len));
}
ce->flag |= CONST_DEPRECATED;
}
/*
* 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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