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-rw-r--r--variable.c921
1 files changed, 921 insertions, 0 deletions
diff --git a/variable.c b/variable.c
new file mode 100644
index 0000000000..fc514f902a
--- /dev/null
+++ b/variable.c
@@ -0,0 +1,921 @@
+/************************************************
+
+ variable.c -
+
+ $Author$
+ $Date$
+ created at: Tue Apr 19 23:55:15 JST 1994
+
+************************************************/
+
+#include "ruby.h"
+#include "env.h"
+#include "node.h"
+#include "st.h"
+
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif
+
+static st_table *rb_global_tbl;
+st_table *rb_class_tbl;
+#define global_tbl rb_global_tbl
+#define class_tbl rb_class_tbl
+
+int rb_const_defined();
+
+st_table*
+new_idhash()
+{
+ return st_init_numtable();
+}
+
+void
+Init_var_tables()
+{
+ global_tbl = new_idhash();
+ class_tbl = new_idhash();
+}
+
+struct fc_result {
+ ID name;
+ VALUE class;
+ VALUE path;
+ VALUE track;
+ struct fc_result *prev;
+};
+
+extern VALUE cModule;
+
+static int
+fc_i(key, value, res)
+ ID key;
+ VALUE value;
+ struct fc_result *res;
+{
+ VALUE path;
+ char *name;
+
+ if (!rb_is_const_id(key)) return ST_CONTINUE;
+
+ name = rb_id2name(key);
+ if (res->path) {
+ path = str_dup(res->path);
+ str_cat(path, "::", 2);
+ str_cat(path, name, strlen(name));
+ }
+ else {
+ path = str_new2(name);
+ }
+ if (value == res->class) {
+ res->name = key;
+ res->path = path;
+ return ST_STOP;
+ }
+ if (obj_is_kind_of(value, cModule)) {
+ struct fc_result arg;
+ struct fc_result *list;
+
+
+ if (!RCLASS(value)->iv_tbl) return ST_CONTINUE;
+
+ list = res;
+ while (list) {
+ if (list->track == value) return ST_CONTINUE;
+ list = list->prev;
+ }
+
+ arg.name = 0;
+ arg.path = path;
+ arg.class = res->class;
+ arg.track = value;
+ arg.prev = res;
+ st_foreach(RCLASS(value)->iv_tbl, fc_i, &arg);
+ if (arg.name) {
+ res->name = arg.name;
+ res->path = arg.path;
+ return ST_STOP;
+ }
+ }
+ return ST_CONTINUE;
+}
+
+static VALUE
+find_class_path(class)
+ VALUE class;
+{
+ VALUE c;
+ struct fc_result arg;
+
+ arg.name = 0;
+ arg.path = 0;
+ arg.class = class;
+ arg.track = cObject;
+ arg.prev = 0;
+ if (RCLASS(cObject)->iv_tbl) {
+ st_foreach(RCLASS(cObject)->iv_tbl, fc_i, &arg);
+ }
+ if (arg.name == 0) {
+ st_foreach(class_tbl, fc_i, &arg);
+ }
+ if (arg.name) {
+ rb_iv_set(class, "__classpath__", arg.path);
+ return arg.path;
+ }
+ return Qnil;
+}
+
+static VALUE
+classname(class)
+ VALUE class;
+{
+ VALUE path;
+
+ while (TYPE(class) == T_ICLASS || FL_TEST(class, FL_SINGLETON)) {
+ class = (VALUE)RCLASS(class)->super;
+ }
+ path = rb_iv_get(class, "__classpath__");
+ if (NIL_P(path)) {
+ path = rb_iv_get(class, "__classid__");
+ if (!NIL_P(path)) {
+ path = str_new2(rb_id2name(FIX2INT(path)));
+ }
+ }
+ if (NIL_P(path)) {
+ path = find_class_path(class);
+ if (NIL_P(path)) {
+ return 0;
+ }
+ return path;
+ }
+ if (TYPE(path) != T_STRING) Bug("class path is not set properly");
+ return path;
+}
+
+VALUE
+rb_class_path(class)
+ VALUE class;
+{
+ VALUE path = classname(class);
+
+ if (path) return path;
+ else {
+ char buf[256];
+ char *s = "Class";
+
+ if (TYPE(class) == T_MODULE) s = "Module";
+ sprintf(buf, "#<%s 0x%x>", s, class);
+ return str_new2(buf);
+ }
+}
+
+void
+rb_set_class_path(class, under, name)
+ VALUE class, under;
+ char *name;
+{
+ VALUE str;
+ char *s;
+
+ if (under == cObject) {
+ str = str_new2(name);
+ }
+ else {
+ str = str_dup(rb_class_path(under));
+ str_cat(str, "::", 2);
+ str_cat(str, name, strlen(name));
+ }
+ rb_iv_set(class, "__classpath__", str);
+}
+
+VALUE
+rb_path2class(path)
+ char *path;
+{
+ if (path[0] == '#') {
+ ArgError("can't retrieve anonymous class %s", path);
+ }
+ return rb_eval_string(path);
+}
+
+void
+rb_name_class(class, id)
+ VALUE class;
+ ID id;
+{
+ extern VALUE cString;
+
+ if (cString) {
+ rb_iv_set(class, "__classpath__", str_new2(rb_id2name(id)));
+ }
+ else {
+ rb_iv_set(class, "__classid__", INT2FIX(id));
+ }
+}
+
+static st_table *autoload_tbl = 0;
+
+static void
+rb_autoload_id(id, filename)
+ ID id;
+ char *filename;
+{
+ if (!rb_is_const_id(id)) {
+ NameError("autoload must be constant name", rb_id2name(id));
+ }
+
+ if (!autoload_tbl) {
+ autoload_tbl = new_idhash();
+ }
+ st_insert(autoload_tbl, id, strdup(filename));
+}
+
+void
+rb_autoload(class, filename)
+ char *class, *filename;
+{
+ rb_autoload_id(rb_intern(class), filename);
+}
+
+VALUE
+f_autoload(obj, class, file)
+ VALUE obj, class;
+ struct RString *file;
+{
+ ID id = rb_to_id(class);
+
+ Check_Type(file, T_STRING);
+ rb_autoload_id(id, file->ptr);
+ return Qnil;
+}
+
+char *
+rb_class2name(class)
+ VALUE class;
+{
+ return RSTRING(rb_class_path(class))->ptr;
+}
+
+struct trace_var {
+ void (*func)();
+ void *data;
+ struct trace_var *next;
+};
+
+VALUE f_untrace_var();
+
+struct global_entry {
+ ID id;
+ void *data;
+ VALUE (*getter)();
+ void (*setter)();
+ void (*marker)();
+ int block_trace;
+ struct trace_var *trace;
+};
+
+static VALUE undef_getter();
+static void undef_setter();
+static void undef_marker();
+
+static VALUE val_getter();
+static void val_setter();
+static void val_marker();
+
+static VALUE var_getter();
+static void var_setter();
+static void var_marker();
+
+struct global_entry*
+rb_global_entry(id)
+ ID id;
+{
+ struct global_entry *entry;
+
+ if (!st_lookup(global_tbl, id, &entry)) {
+ entry = ALLOC(struct global_entry);
+ st_insert(global_tbl, id, entry);
+ entry->id = id;
+ entry->data = 0;
+ entry->getter = undef_getter;
+ entry->setter = undef_setter;
+ entry->marker = undef_marker;
+
+ entry->block_trace = 0;
+ entry->trace = 0;
+ }
+ return entry;
+}
+
+static VALUE
+undef_getter(id)
+ ID id;
+{
+ Warning("global variable `%s' not initialized", rb_id2name(id));
+ return Qnil;
+}
+
+static void
+undef_setter(val, id, data, entry)
+ VALUE val;
+ ID id;
+ void *data;
+ struct global_entry *entry;
+{
+ entry->getter = val_getter;
+ entry->setter = val_setter;
+ entry->marker = val_marker;
+
+ entry->data = (void*)val;
+}
+
+static void
+undef_marker()
+{
+}
+
+static VALUE
+val_getter(id, val)
+ ID id;
+ VALUE val;
+{
+ return val;
+}
+
+static void
+val_setter(val, id, data, entry)
+ VALUE val;
+ ID id;
+ void *data;
+ struct global_entry *entry;
+{
+ entry->data = (void*)val;
+}
+
+static void
+val_marker(data)
+ void *data;
+{
+ if (data) gc_mark_maybe(data);
+}
+
+static VALUE
+var_getter(id, var)
+ ID id;
+ VALUE *var;
+{
+ if (!var || !*var) return Qnil;
+ return *var;
+}
+
+static void
+var_setter(val, id, var)
+ VALUE val;
+ ID id;
+ VALUE *var;
+{
+ *var = val;
+}
+
+static void
+var_marker(var)
+ VALUE **var;
+{
+ if (var) gc_mark_maybe(*var);
+}
+
+static void
+readonly_setter(val, id, var)
+ VALUE val;
+ ID id;
+ void *var;
+{
+ NameError("Can't set variable %s", rb_id2name(id));
+}
+
+static int
+mark_global_entry(key, entry)
+ ID key;
+ struct global_entry *entry;
+{
+ struct trace_var *trace;
+
+ (*entry->marker)(entry->data);
+ trace = entry->trace;
+ while (trace) {
+ if (trace->data) gc_mark_maybe(trace->data);
+ trace = trace->next;
+ }
+ return ST_CONTINUE;
+}
+
+void
+gc_mark_global_tbl()
+{
+ st_foreach(global_tbl, mark_global_entry, 0);
+}
+
+static ID
+global_id(name)
+ char *name;
+{
+ ID id;
+
+ if (name[0] == '$') id = rb_intern(name);
+ else {
+ char *buf = ALLOCA_N(char, strlen(name)+2);
+ buf[0] = '$';
+ strcpy(buf+1, name);
+ id = rb_intern(buf);
+ }
+ return id;
+}
+
+void
+rb_define_hooked_variable(name, var, getter, setter)
+ char *name;
+ VALUE *var;
+ VALUE (*getter)();
+ void (*setter)();
+{
+ struct global_entry *entry;
+ ID id = global_id(name);
+
+ entry = rb_global_entry(id);
+ entry->data = (void*)var;
+ entry->getter = getter?getter:var_getter;
+ entry->setter = setter?setter:var_setter;
+ entry->marker = var_marker;
+}
+
+void
+rb_define_variable(name, var)
+ char *name;
+ VALUE *var;
+{
+ rb_define_hooked_variable(name, var, 0, 0);
+}
+
+void
+rb_define_readonly_variable(name, var)
+ char *name;
+ VALUE *var;
+{
+ rb_define_hooked_variable(name, var, 0, readonly_setter);
+}
+
+void
+rb_define_virtual_variable(name, getter, setter)
+ char *name;
+ VALUE (*getter)();
+ void (*setter)();
+{
+ if (!getter) getter = val_getter;
+ if (!setter) setter = readonly_setter;
+ rb_define_hooked_variable(name, 0, getter, setter);
+}
+
+static void
+rb_trace_eval(cmd, val)
+ VALUE cmd, val;
+{
+ rb_eval_cmd(cmd, ary_new3(1, val));
+}
+
+VALUE
+f_trace_var(argc, argv)
+ int argc;
+ VALUE *argv;
+{
+ VALUE var, cmd;
+ ID id;
+ struct global_entry *entry;
+ struct trace_var *trace;
+
+ if (rb_scan_args(argc, argv, "11", &var, &cmd) == 1) {
+ cmd = f_lambda();
+ }
+ if (NIL_P(cmd)) {
+ return f_untrace_var(argc, argv, Qnil);
+ }
+ id = rb_to_id(var);
+ if (!st_lookup(global_tbl, id, &entry)) {
+ NameError("undefined global variable %s", rb_id2name(id));
+ }
+ trace = ALLOC(struct trace_var);
+ trace->next = entry->trace;
+ trace->func = rb_trace_eval;
+ trace->data = (void*)cmd;
+ entry->trace = trace;
+
+ return Qnil;
+}
+
+VALUE
+f_untrace_var(argc, argv)
+ int argc;
+ VALUE *argv;
+{
+ VALUE var, cmd;
+ ID id;
+ struct global_entry *entry;
+ struct trace_var *trace;
+
+ rb_scan_args(argc, argv, "11", &var, &cmd);
+ id = rb_to_id(var);
+ if (!st_lookup(global_tbl, id, &entry)) {
+ NameError("undefined global variable %s", rb_id2name(id));
+ }
+ if (NIL_P(cmd)) {
+ VALUE ary = ary_new();
+
+ trace = entry->trace;
+ while (trace) {
+ struct trace_var *next = trace->next;
+ ary_push(ary, trace->data);
+ free(trace);
+ trace = next;
+ }
+ entry->trace = 0;
+
+ return ary;
+ }
+ else {
+ struct trace_var t;
+ struct trace_var *next;
+
+ t.next = entry->trace;
+ trace = &t;
+ while (trace->next) {
+ next = trace->next;
+ if (next->data == (void*)cmd) {
+ trace->next = next->next;
+ free(next);
+ entry->trace = t.next;
+ return ary_new3(1, cmd);
+ }
+ trace = next;
+ }
+ }
+ return Qnil;
+}
+
+VALUE
+rb_gvar_get(entry)
+ struct global_entry *entry;
+{
+ return (*entry->getter)(entry->id, entry->data, entry);
+}
+
+struct trace_data {
+ struct trace_var *trace;
+ VALUE val;
+};
+
+static void
+trace_ev(data)
+ struct trace_data *data;
+{
+ struct trace_var *trace = data->trace;
+
+ while (trace) {
+ (*trace->func)(trace->data, data->val);
+ trace = trace->next;
+ }
+}
+
+static void
+trace_en(entry)
+ struct global_entry *entry;
+{
+ entry->block_trace = 0;
+}
+
+VALUE
+rb_gvar_set(entry, val)
+ struct global_entry *entry;
+ VALUE val;
+{
+ struct trace_data trace;
+
+ if (rb_safe_level() >= 4) {
+ extern VALUE eSecurityError;
+ Raise(eSecurityError, "cannot change global variable value");
+ }
+ (*entry->setter)(val, entry->id, entry->data, entry);
+
+ if (!entry->block_trace) {
+ entry->block_trace = 1;
+ trace.trace = entry->trace;
+ trace.val = val;
+ rb_ensure(trace_ev, &trace, trace_en, entry);
+ }
+ return val;
+}
+
+VALUE
+rb_gvar_set2(name, val)
+ char *name;
+ VALUE val;
+{
+ struct global_entry *entry;
+
+ entry = rb_global_entry(global_id(name));
+ return rb_gvar_set(entry, val);
+}
+
+VALUE
+rb_gvar_defined(entry)
+ struct global_entry *entry;
+{
+ if (entry->getter == undef_getter) return FALSE;
+ return TRUE;
+}
+
+void
+rb_alias_variable(name1, name2)
+ ID name1;
+ ID name2;
+{
+ struct global_entry *entry1, *entry2;
+
+ entry1 = rb_global_entry(name1);
+ entry2 = rb_global_entry(name2);
+
+ entry1->data = entry2->data;
+ entry1->getter = entry2->getter;
+ entry1->setter = entry2->setter;
+ entry1->marker = entry2->marker;
+}
+
+VALUE
+rb_ivar_get(obj, id)
+ struct RObject *obj;
+ ID id;
+{
+ VALUE val;
+
+ switch (TYPE(obj)) {
+ case T_OBJECT:
+ case T_CLASS:
+ case T_MODULE:
+ if (obj->iv_tbl && st_lookup(obj->iv_tbl, id, &val))
+ return val;
+ return Qnil;
+ default:
+ TypeError("class %s can not have instance variables",
+ rb_class2name(CLASS_OF(obj)));
+ break;
+ }
+ Warning("instance var %s not initialized", rb_id2name(id));
+ return Qnil;
+}
+
+VALUE
+rb_ivar_set(obj, id, val)
+ struct RObject *obj;
+ ID id;
+ VALUE val;
+{
+ if (rb_safe_level() >= 5) {
+ extern VALUE eSecurityError;
+ Raise(eSecurityError, "cannot change object status");
+ }
+ switch (TYPE(obj)) {
+ case T_OBJECT:
+ case T_CLASS:
+ case T_MODULE:
+ if (!obj->iv_tbl) obj->iv_tbl = new_idhash();
+ st_insert(obj->iv_tbl, id, val);
+ break;
+ default:
+ TypeError("class %s can not have instance variables",
+ rb_class2name(CLASS_OF(obj)));
+ break;
+ }
+ return val;
+}
+
+VALUE
+rb_ivar_defined(obj, id)
+ struct RObject *obj;
+ ID id;
+{
+ switch (TYPE(obj)) {
+ case T_OBJECT:
+ case T_CLASS:
+ case T_MODULE:
+ if (obj->iv_tbl && st_lookup(obj->iv_tbl, id, 0))
+ return TRUE;
+ break;
+ }
+ return FALSE;
+}
+
+VALUE
+rb_const_get_at(class, id)
+ struct RClass *class;
+ ID id;
+{
+ VALUE value;
+
+ if (class->iv_tbl && st_lookup(class->iv_tbl, id, &value)) {
+ return value;
+ }
+ if ((VALUE)class == cObject) {
+ return rb_const_get(class, id);
+ }
+ NameError("Uninitialized constant %s::%s",
+ RSTRING(rb_class_path(class))->ptr,
+ rb_id2name(id));
+ /* not reached */
+}
+
+VALUE
+rb_const_get(class, id)
+ struct RClass *class;
+ ID id;
+{
+ VALUE value;
+ struct RClass *tmp;
+
+ tmp = class;
+ while (tmp) {
+ if (tmp->iv_tbl && st_lookup(tmp->iv_tbl, id, &value)) {
+ return value;
+ }
+ tmp = tmp->super;
+ }
+ if (BUILTIN_TYPE(class) == T_MODULE) {
+ return rb_const_get(cObject, id);
+ }
+
+ /* pre-defined class */
+ if (st_lookup(class_tbl, id, &value)) return value;
+
+ /* autoload */
+ if (autoload_tbl && st_lookup(autoload_tbl, id, 0)) {
+ char *modname;
+ VALUE module;
+
+ st_delete(autoload_tbl, &id, &modname);
+ module = str_new2(modname);
+ free(modname);
+ f_require(0, module);
+ return rb_const_get(class, id);
+ }
+
+ /* Uninitialized constant */
+ if (class && (VALUE)class != cObject)
+ NameError("Uninitialized constant %s::%s",
+ RSTRING(rb_class_path(class))->ptr,
+ rb_id2name(id));
+ else {
+ NameError("Uninitialized constant %s",rb_id2name(id));
+ }
+ /* not reached */
+}
+
+int
+const_i(key, value, hash)
+ ID key;
+ VALUE value;
+ VALUE hash;
+{
+ if (rb_is_const_id(key)) {
+ hash_aset(hash, str_new2(rb_id2name(key)), value);
+ }
+ return ST_CONTINUE;
+}
+
+VALUE
+mod_constants(argc, argv, mod)
+ int argc;
+ VALUE *argv;
+ struct RClass *mod;
+{
+ VALUE option;
+ VALUE hash;
+
+ rb_scan_args(argc, argv, "01", &option);
+ hash = hash_new();
+ st_foreach(mod->iv_tbl, const_i, hash);
+ if (!FL_TEST(mod, FL_SINGLETON)) {
+ mod = mod->super;
+ if (!mod) {
+ Bug("no superclass for singleton class");
+ }
+ st_foreach(mod->iv_tbl, const_i, hash);
+ }
+ if (RTEST(option)) {
+ for (;;) {
+ mod = mod->super;
+ if (!mod) break;
+ st_foreach(mod->iv_tbl, const_i, hash);
+ }
+ st_foreach(class_tbl, const_i, hash);
+ if (autoload_tbl) {
+ st_foreach(autoload_tbl, const_i, hash);
+ }
+ }
+ return hash;
+}
+
+int
+rb_const_defined_at(class, id)
+ struct RClass *class;
+ ID id;
+{
+ if (class->iv_tbl && st_lookup(class->iv_tbl, id, 0)) {
+ return TRUE;
+ }
+ if ((VALUE)class == cObject) {
+ return rb_const_defined(class, id);
+ }
+ return FALSE;
+}
+
+int
+rb_autoload_defined(id)
+ ID id;
+{
+ if (autoload_tbl && st_lookup(autoload_tbl, id, 0))
+ return TRUE;
+ return FALSE;
+}
+
+int
+rb_const_defined(class, id)
+ struct RClass *class;
+ ID id;
+{
+ while (class) {
+ if (class->iv_tbl && st_lookup(class->iv_tbl, id, 0)) {
+ return TRUE;
+ }
+ class = class->super;
+ }
+ if (st_lookup(class_tbl, id, 0))
+ return TRUE;
+ return rb_autoload_defined(id);
+}
+
+void
+rb_const_set(class, id, val)
+ struct RClass *class;
+ ID id;
+ VALUE val;
+{
+ if (!class->iv_tbl) {
+ class->iv_tbl = new_idhash();
+ }
+ else if (st_lookup(class->iv_tbl, id, 0)) {
+ NameError("already initialized constant %s", rb_id2name(id));
+ }
+
+ st_insert(class->iv_tbl, id, val);
+}
+
+void
+rb_define_const(class, name, val)
+ VALUE class;
+ char *name;
+ VALUE val;
+{
+ ID id = rb_intern(name);
+ if (!rb_is_const_id(id)) {
+ NameError("wrong constant name %s", name);
+ }
+ rb_const_set(class, id, val);
+}
+
+extern VALUE mKernel;
+
+void
+rb_define_global_const(name, val)
+ char *name;
+ VALUE val;
+{
+ rb_define_const(mKernel, name, val);
+}
+
+VALUE
+rb_iv_get(obj, name)
+ VALUE obj;
+ char *name;
+{
+ ID id = rb_intern(name);
+
+ return rb_ivar_get(obj, id);
+}
+
+VALUE
+rb_iv_set(obj, name, val)
+ VALUE obj;
+ char *name;
+ VALUE val;
+{
+ ID id = rb_intern(name);
+
+ return rb_ivar_set(obj, id, val);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-07 00:19:50 +0000