diff options
Diffstat (limited to 'ruby_1_8_5/variable.c')
| -rw-r--r-- | ruby_1_8_5/variable.c | 1960 |
1 files changed, 0 insertions, 1960 deletions
diff --git a/ruby_1_8_5/variable.c b/ruby_1_8_5/variable.c deleted file mode 100644 index a51dd9ea58..0000000000 --- a/ruby_1_8_5/variable.c +++ /dev/null @@ -1,1960 +0,0 @@ -/********************************************************************** - - variable.c - - - $Author: matz $ - $Date: 2006/07/20 07:04:17 $ - 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" - -st_table *rb_global_tbl; -st_table *rb_class_tbl; -static ID autoload, classpath, tmp_classpath; - -void -Init_var_tables() -{ - 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(fc, name) - 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(key, value, res) - 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_safe(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(klass) - VALUE klass; -{ - struct fc_result arg; - - arg.name = 0; - arg.path = 0; - arg.klass = klass; - arg.track = rb_cObject; - arg.prev = 0; - if (RCLASS(rb_cObject)->iv_tbl) { - st_foreach_safe(RCLASS(rb_cObject)->iv_tbl, fc_i, (st_data_t)&arg); - } - if (arg.path == 0) { - st_foreach(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(klass) - 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(mod) - 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(klass) - 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 { - char *s = "Class"; - size_t len; - - if (TYPE(klass) == T_MODULE) { - if (rb_obj_class(klass) == rb_cModule) { - s = "Module"; - } - else { - s = rb_class2name(RBASIC(klass)->klass); - } - } - len = 2 + strlen(s) + 3 + 2 * SIZEOF_LONG + 1; - path = rb_str_new(0, len); - snprintf(RSTRING(path)->ptr, len+1, "#<%s:0x%lx>", s, klass); - RSTRING(path)->len = strlen(RSTRING(path)->ptr); - rb_ivar_set(klass, tmp_classpath, path); - - return path; - } -} - -void -rb_set_class_path(klass, under, name) - VALUE klass, under; - const char *name; -{ - VALUE str; - - if (under == rb_cObject) { - str = rb_str_new2(name); - } - else { - str = rb_str_dup(rb_class_path(under)); - rb_str_cat2(str, "::"); - rb_str_cat2(str, name); - } - rb_ivar_set(klass, classpath, str); -} - -VALUE -rb_path2class(path) - 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(klass, id) - VALUE klass; - ID id; -{ - rb_iv_set(klass, "__classid__", ID2SYM(id)); -} - -VALUE -rb_class_name(klass) - VALUE klass; -{ - return rb_class_path(rb_class_real(klass)); -} - -char * -rb_class2name(klass) - VALUE klass; -{ - return RSTRING(rb_class_name(klass))->ptr; -} - -char * -rb_obj_classname(obj) - 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(); -static void undef_setter(); -static void undef_marker(); - -static VALUE val_getter(); -static void val_setter(); -static void val_marker(); - -static VALUE var_getter(); -static void var_setter(); -static void var_marker(); - -struct global_entry* -rb_global_entry(id) - ID id; -{ - struct global_entry *entry; - - if (!st_lookup(rb_global_tbl, id, (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 id; -{ - rb_warning("global variable `%s' not initialized", rb_id2name(id)); - - return Qnil; -} - -static void -undef_setter(val, id, data, var) - 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() -{ -} - -static VALUE -val_getter(id, val) - ID id; - VALUE val; -{ - return val; -} - -static void -val_setter(val, id, data, var) - VALUE val; - ID id; - void *data; - struct global_variable *var; -{ - var->data = (void*)val; -} - -static void -val_marker(data) - VALUE data; -{ - if (data) rb_gc_mark_maybe(data); -} - -static VALUE -var_getter(id, var) - ID id; - VALUE *var; -{ - if (!var) return Qnil; - return *var; -} - -static void -var_setter(val, id, var) - VALUE val; - ID id; - VALUE *var; -{ - *var = val; -} - -static void -var_marker(var) - VALUE *var; -{ - if (var) rb_gc_mark_maybe(*var); -} - -static void -readonly_setter(val, id, var) - VALUE val; - ID id; - void *var; -{ - rb_name_error(id, "%s is a read-only variable", rb_id2name(id)); -} - -static int -mark_global_entry(key, 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() -{ - if (rb_global_tbl) { - st_foreach(rb_global_tbl, mark_global_entry, 0); - } -} - -static ID -global_id(name) - const char *name; -{ - ID id; - - if (name[0] == '$') id = rb_intern(name); - else { - char *buf = ALLOCA_N(char, strlen(name)+2); - buf[0] = '$'; - strcpy(buf+1, name); - id = rb_intern(buf); - } - return id; -} - -void -rb_define_hooked_variable(name, var, getter, setter) - const char *name; - VALUE *var; - VALUE (*getter)(); - void (*setter)(); -{ - struct global_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(name, var) - const char *name; - VALUE *var; -{ - rb_define_hooked_variable(name, var, 0, 0); -} - -void -rb_define_readonly_variable(name, var) - const char *name; - VALUE *var; -{ - rb_define_hooked_variable(name, var, 0, readonly_setter); -} - -void -rb_define_virtual_variable(name, getter, setter) - const char *name; - VALUE (*getter)(); - void (*setter)(); -{ - if (!getter) getter = val_getter; - if (!setter) setter = readonly_setter; - rb_define_hooked_variable(name, 0, getter, setter); -} - -static void -rb_trace_eval(cmd, val) - VALUE cmd, val; -{ - rb_eval_cmd(cmd, rb_ary_new3(1, val), 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(argc, argv) - 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(var) - 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(argc, argv) - int argc; - VALUE *argv; -{ - VALUE var, cmd; - ID id; - struct global_entry *entry; - struct trace_var *trace; - - rb_scan_args(argc, argv, "11", &var, &cmd); - id = rb_to_id(var); - if (!st_lookup(rb_global_tbl, id, (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(entry) - 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(data) - struct trace_data *data; -{ - struct trace_var *trace = data->trace; - - while (trace) { - (*trace->func)(trace->data, data->val); - trace = trace->next; - } - return Qnil; /* not reached */ -} - -static VALUE -trace_en(var) - struct global_variable *var; -{ - var->block_trace = 0; - remove_trace(var); - return Qnil; /* not reached */ -} - -VALUE -rb_gvar_set(entry, val) - 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(name, val) - const char *name; - VALUE val; -{ - struct global_entry *entry; - - entry = rb_global_entry(global_id(name)); - return rb_gvar_set(entry, val); -} - -VALUE -rb_gv_get(name) - const char *name; -{ - struct global_entry *entry; - - entry = rb_global_entry(global_id(name)); - return rb_gvar_get(entry); -} - -VALUE -rb_gvar_defined(entry) - struct global_entry *entry; -{ - if (entry->var->getter == undef_getter) return Qfalse; - return Qtrue; -} - -static int -gvar_i(key, entry, ary) - ID key; - struct global_entry *entry; - VALUE ary; -{ - rb_ary_push(ary, rb_str_new2(rb_id2name(key))); - return ST_CONTINUE; -} - -/* - * 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() -{ - VALUE ary = rb_ary_new(); - char buf[4]; - char *s = "&`'+123456789"; - - st_foreach(rb_global_tbl, gvar_i, ary); - if (!NIL_P(rb_backref_get())) { - while (*s) { - sprintf(buf, "$%c", *s++); - rb_ary_push(ary, rb_str_new2(buf)); - } - } - return ary; -} - -void -rb_alias_variable(name1, name2) - ID name1; - ID name2; -{ - struct global_entry *entry1, *entry2; - - 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(obj) - 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(obj, id, warn) - 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(obj, id, val) - VALUE obj; - ID id; - VALUE val; -{ - st_table *tbl; - - if (rb_special_const_p(obj)) { - special_generic_ivar = 1; - } - if (!generic_iv_tbl) { - generic_iv_tbl = st_init_numtable(); - } - - if (!st_lookup(generic_iv_tbl, obj, (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(obj, id) - 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(obj, id, valp) - 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(obj) - 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(key, value) - ID key; - VALUE value; -{ - rb_gc_mark(value); - return ST_CONTINUE; -} - -static int -givar_i(obj, tbl) - VALUE obj; - st_table *tbl; -{ - if (rb_special_const_p(obj)) { - st_foreach(tbl, givar_mark_i, 0); - } - return ST_CONTINUE; -} - -void -rb_mark_generic_ivar_tbl() -{ - if (!generic_iv_tbl) return; - if (special_generic_ivar == 0) return; - st_foreach_safe(generic_iv_tbl, givar_i, 0); -} - -void -rb_free_generic_ivar(obj) - VALUE obj; -{ - st_table *tbl; - - if (st_delete(generic_iv_tbl, &obj, (st_data_t *)&tbl)) - st_free_table(tbl); -} - -void -rb_copy_generic_ivar(clone, obj) - VALUE clone, obj; -{ - st_table *tbl; - - if (!generic_iv_tbl) 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)); - } - } -} - -static VALUE -ivar_get(obj, id, warn) - 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(obj, id) - VALUE obj; - ID id; -{ - return ivar_get(obj, id, Qtrue); -} - -VALUE -rb_attr_get(obj, id) - VALUE obj; - ID id; -{ - return ivar_get(obj, id, Qfalse); -} - -VALUE -rb_ivar_set(obj, id, val) - VALUE obj; - ID id; - VALUE val; -{ - if (!OBJ_TAINTED(obj) && rb_safe_level() >= 4) - rb_raise(rb_eSecurityError, "Insecure: can't modify instance variable"); - if (OBJ_FROZEN(obj)) rb_error_frozen("object"); - switch (TYPE(obj)) { - case T_OBJECT: - case T_CLASS: - case T_MODULE: - if (!ROBJECT(obj)->iv_tbl) ROBJECT(obj)->iv_tbl = st_init_numtable(); - st_insert(ROBJECT(obj)->iv_tbl, id, val); - break; - default: - generic_ivar_set(obj, id, val); - break; - } - return val; -} - -VALUE -rb_ivar_defined(obj, id) - VALUE obj; - ID id; -{ - switch (TYPE(obj)) { - case T_OBJECT: - case T_CLASS: - case T_MODULE: - if (ROBJECT(obj)->iv_tbl && st_lookup(ROBJECT(obj)->iv_tbl, id, 0)) - return Qtrue; - break; - default: - if (FL_TEST(obj, FL_EXIVAR) || rb_special_const_p(obj)) - return generic_ivar_defined(obj, id); - break; - } - return Qfalse; -} - -static int -ivar_i(key, entry, ary) - ID key; - struct global_entry *entry; - VALUE ary; -{ - if (rb_is_instance_id(key)) { - rb_ary_push(ary, rb_str_new2(rb_id2name(key))); - } - return ST_CONTINUE; -} - -/* - * 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(obj) - VALUE obj; -{ - VALUE ary; - - ary = rb_ary_new(); - switch (TYPE(obj)) { - case T_OBJECT: - case T_CLASS: - case T_MODULE: - if (ROBJECT(obj)->iv_tbl) { - st_foreach_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(obj, name) - VALUE obj, name; -{ - VALUE val = Qnil; - ID id = rb_to_id(name); - - if (!OBJ_TAINTED(obj) && rb_safe_level() >= 4) - rb_raise(rb_eSecurityError, "Insecure: can't modify instance variable"); - if (OBJ_FROZEN(obj)) rb_error_frozen("object"); - if (!rb_is_instance_id(id)) { - rb_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(klass, id) - 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(klass, id) - 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(klass, name) - VALUE klass, 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(av) - 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(mod, id, file) - 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", 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(mod, id) - 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(klass, id) - 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(mod, id) - 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 || !*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(mod, id) - 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(klass, id, exclude, recurse) - VALUE klass; - ID id; - int exclude, recurse; -{ - VALUE value, tmp; - int mod_retry = 0; - - tmp = klass; - retry: - while (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 && klass != rb_cObject) break; - tmp = RCLASS(tmp)->super; - } - if (!exclude && !mod_retry && BUILTIN_TYPE(klass) == T_MODULE) { - mod_retry = 1; - tmp = rb_cObject; - goto retry; - } - - return const_missing(klass, id); -} - -VALUE -rb_const_get_from(klass, id) - VALUE klass; - ID id; -{ - return rb_const_get_0(klass, id, Qtrue, Qtrue); -} - -VALUE -rb_const_get(klass, id) - VALUE klass; - ID id; -{ - return rb_const_get_0(klass, id, Qfalse, Qtrue); -} - -VALUE -rb_const_get_at(klass, id) - VALUE klass; - ID id; -{ - return rb_const_get_0(klass, id, Qtrue, Qfalse); -} - -/* - * 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(mod, name) - VALUE mod, 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(key, value, tbl) - 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(mod, data) - 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(mod, data) - 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(key, value, ary) - ID key, value; - VALUE ary; -{ - rb_ary_push(ary, rb_str_new2(rb_id2name(key))); - return ST_CONTINUE; -} - -VALUE -rb_const_list(data) - void *data; -{ - st_table *tbl = data; - VALUE ary; - - if (!tbl) return rb_ary_new2(0); - ary = rb_ary_new2(tbl->num_entries); - st_foreach(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(mod) - VALUE mod; -{ - return rb_const_list(rb_mod_const_of(mod, 0)); -} - -static int -rb_const_defined_0(klass, id, exclude, recurse) - VALUE klass; - ID id; - int exclude, recurse; -{ - VALUE value, tmp; - int mod_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 && klass != rb_cObject) break; - tmp = RCLASS(tmp)->super; - } - if (!exclude && !mod_retry && BUILTIN_TYPE(klass) == T_MODULE) { - mod_retry = 1; - tmp = rb_cObject; - goto retry; - } - return Qfalse; -} - -int -rb_const_defined_from(klass, id) - VALUE klass; - ID id; -{ - return rb_const_defined_0(klass, id, Qtrue, Qtrue); -} - -int -rb_const_defined(klass, id) - VALUE klass; - ID id; -{ - return rb_const_defined_0(klass, id, Qfalse, Qtrue); -} - -int -rb_const_defined_at(klass, id) - VALUE klass; - ID id; -{ - return rb_const_defined_0(klass, id, Qtrue, Qfalse); -} - -static void -mod_av_set(klass, id, val, isconst) - VALUE klass; - ID id; - VALUE val; - int isconst; -{ - char *dest = isconst ? "constant" : "class variable"; - - if (!OBJ_TAINTED(klass) && rb_safe_level() >= 4) - rb_raise(rb_eSecurityError, "Insecure: can't set %s", dest); - if (OBJ_FROZEN(klass)) { - 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(klass, id, val) - 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(klass, name, val) - 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(name, val) - const char *name; - VALUE val; -{ - rb_define_const(rb_cObject, name, val); -} - -static VALUE -original_module(c) - VALUE c; -{ - if (TYPE(c) == T_ICLASS) - return RBASIC(c)->klass; - return c; -} - -static void -cvar_override_check(id, a) - ID id; - VALUE a; -{ - VALUE base = original_module(a); - - a = RCLASS(a)->super; - while (a) { - if (RCLASS(a)->iv_tbl) { - if (st_lookup(RCLASS(a)->iv_tbl,id,0)) { - rb_warning("class variable %s of %s is overridden by %s", - rb_id2name(id), rb_class2name(original_module(a)), - rb_class2name(base)); - } - } - a = RCLASS(a)->super; - } -} - -void -rb_cvar_set(klass, id, val, warn) - VALUE klass; - ID id; - VALUE val; - int warn; -{ - VALUE tmp; - - tmp = klass; - while (tmp) { - if (RCLASS(tmp)->iv_tbl && st_lookup(RCLASS(tmp)->iv_tbl,id,0)) { - if (OBJ_FROZEN(tmp)) rb_error_frozen("class/module"); - if (!OBJ_TAINTED(tmp) && rb_safe_level() >= 4) - rb_raise(rb_eSecurityError, "Insecure: can't modify class variable"); - if (warn && RTEST(ruby_verbose) && klass != tmp) { - rb_warning("already initialized class variable %s", rb_id2name(id)); - } - st_insert(RCLASS(tmp)->iv_tbl,id,val); - if (RTEST(ruby_verbose)) { - cvar_override_check(id, tmp); - } - return; - } - tmp = RCLASS(tmp)->super; - } - - mod_av_set(klass, id, val, Qfalse); -} - -VALUE -rb_cvar_get(klass, id) - VALUE klass; - ID id; -{ - VALUE value; - VALUE tmp; - - tmp = klass; - while (tmp) { - if (RCLASS(tmp)->iv_tbl) { - if (st_lookup(RCLASS(tmp)->iv_tbl,id,&value)) { - if (RTEST(ruby_verbose)) { - cvar_override_check(id, tmp); - } - return value; - } - } - tmp = RCLASS(tmp)->super; - } - - rb_name_error(id,"uninitialized class variable %s in %s", - rb_id2name(id), rb_class2name(klass)); - return Qnil; /* not reached */ -} - -VALUE -rb_cvar_defined(klass, id) - VALUE klass; - ID id; -{ - VALUE tmp; - - tmp = klass; - while (tmp) { - if (RCLASS(tmp)->iv_tbl && st_lookup(RCLASS(tmp)->iv_tbl,id,0)) { - return Qtrue; - } - tmp = RCLASS(tmp)->super; - } - - return Qfalse; -} - -void -rb_cv_set(klass, name, val) - VALUE klass; - const char *name; - VALUE val; -{ - 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(klass, name) - 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(klass, name, val) - 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(key, value, ary) - ID key; - VALUE value; - VALUE ary; -{ - if (rb_is_class_id(key)) { - VALUE kval = rb_str_new2(rb_id2name(key)); - if (!rb_ary_includes(ary, kval)) { - rb_ary_push(ary, kval); - } - } - return ST_CONTINUE; -} - -/* - * call-seq: - * mod.class_variables => array - * - * Returns an array of the names of class variables in <i>mod</i> and - * the ancestors of <i>mod</i>. - * - * class One - * @@var1 = 1 - * end - * class Two < One - * @@var2 = 2 - * end - * One.class_variables #=> ["@@var1"] - * Two.class_variables #=> ["@@var2", "@@var1"] - */ - -VALUE -rb_mod_class_variables(obj) - VALUE obj; -{ - VALUE ary = rb_ary_new(); - - for (;;) { - if (RCLASS(obj)->iv_tbl) { - st_foreach_safe(RCLASS(obj)->iv_tbl, cv_i, ary); - } - obj = RCLASS(obj)->super; - if (!obj) break; - } - 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(mod, name) - VALUE mod, 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(obj, name) - VALUE obj; - const char *name; -{ - ID id = rb_intern(name); - - return rb_ivar_get(obj, id); -} - -VALUE -rb_iv_set(obj, name, val) - VALUE obj; - const char *name; - VALUE val; -{ - ID id = rb_intern(name); - - return rb_ivar_set(obj, id, val); -} |