ruby/eval_method.h

613 строки
13 KiB
C

/*
* This file is included by eval.c
*/
#define CACHE_SIZE 0x800
#define CACHE_MASK 0x7ff
#define EXPR1(c,m) ((((c)>>3)^(m))&CACHE_MASK)
struct cache_entry { /* method hash table. */
ID mid; /* method's id */
ID mid0; /* method's original id */
VALUE klass; /* receiver's class */
NODE *method;
};
static struct cache_entry cache[CACHE_SIZE];
static int ruby_running = 0;
void
rb_clear_cache(void)
{
struct cache_entry *ent, *end;
rb_vm_change_state();
if (!ruby_running)
return;
ent = cache;
end = ent + CACHE_SIZE;
while (ent < end) {
ent->mid = 0;
ent++;
}
}
static void
rb_clear_cache_for_undef(VALUE klass, ID id)
{
struct cache_entry *ent, *end;
rb_vm_change_state();
if (!ruby_running)
return;
ent = cache;
end = ent + CACHE_SIZE;
while (ent < end) {
if (ent->method && ent->method->nd_clss == klass && ent->mid == id) {
ent->mid = 0;
}
ent++;
}
}
static void
rb_clear_cache_by_id(ID id)
{
struct cache_entry *ent, *end;
rb_vm_change_state();
if (!ruby_running)
return;
ent = cache;
end = ent + CACHE_SIZE;
while (ent < end) {
if (ent->mid == id) {
ent->mid = 0;
}
ent++;
}
}
void
rb_clear_cache_by_class(VALUE klass)
{
struct cache_entry *ent, *end;
rb_vm_change_state();
if (!ruby_running)
return;
ent = cache;
end = ent + CACHE_SIZE;
while (ent < end) {
if ((ent->klass == klass) ||
(ent->method && ent->method->nd_clss == klass)) {
ent->mid = 0;
}
ent++;
}
}
void
rb_add_method(VALUE klass, ID mid, NODE * node, int noex)
{
NODE *body;
if (NIL_P(klass)) {
klass = rb_cObject;
}
if (rb_safe_level() >= 4 && (klass == rb_cObject || !OBJ_TAINTED(klass))) {
rb_raise(rb_eSecurityError, "Insecure: can't define method");
}
if (!FL_TEST(klass, FL_SINGLETON) &&
node && nd_type(node) != NODE_ZSUPER &&
(mid == rb_intern("initialize") || mid == rb_intern("initialize_copy"))) {
noex = NOEX_PRIVATE | noex;
}
else if (FL_TEST(klass, FL_SINGLETON) && node
&& nd_type(node) == NODE_CFUNC && mid == rb_intern("allocate")) {
rb_warn
("defining %s.allocate is deprecated; use rb_define_alloc_func()",
rb_class2name(rb_iv_get(klass, "__attached__")));
mid = ID_ALLOCATOR;
}
if (OBJ_FROZEN(klass)) {
rb_error_frozen("class/module");
}
rb_clear_cache_by_id(mid);
/*
* NODE_METHOD (NEW_METHOD(body, klass, vis)):
* nd_body : method body // (2) // mark
* nd_clss : klass // (1) // mark
* nd_noex : visibility // (3)
*
* NODE_FBODY (NEW_FBODY(method, alias)):
* nd_body : method (NODE_METHOD) // (2) // mark
* nd_oid : original id // (1)
* nd_cnt : alias count // (3)
*/
if (node) {
body = NEW_FBODY(NEW_METHOD(node, klass, noex), 0);
}
else {
body = 0;
}
{
/* check re-definition */
NODE *old_node;
if (st_lookup(RCLASS(klass)->m_tbl, mid, (st_data_t *)&old_node)) {
if (old_node) {
if (nd_type(old_node->nd_body->nd_body) == NODE_CFUNC) {
rb_vm_check_redefinition_opt_method(old_node);
}
if (RTEST(ruby_verbose) && old_node->nd_cnt == 0 && old_node->nd_body) {
rb_warning("method redefined; discarding old %s", rb_id2name(mid));
}
}
if (klass == rb_cObject && node->nd_mid == init) {
rb_warn("redefining Object#initialize may cause infinite loop");
}
}
if (mid == object_id || mid == __send || mid == __send_bang) {
if (node && nd_type(node) == RUBY_VM_METHOD_NODE) {
rb_warn("redefining `%s' may cause serious problem",
rb_id2name(mid));
}
}
}
st_insert(RCLASS(klass)->m_tbl, mid, (st_data_t) body);
if (node && mid != ID_ALLOCATOR && ruby_running) {
if (FL_TEST(klass, FL_SINGLETON)) {
rb_funcall(rb_iv_get(klass, "__attached__"), singleton_added, 1,
ID2SYM(mid));
}
else {
rb_funcall(klass, added, 1, ID2SYM(mid));
}
}
}
void
rb_define_alloc_func(VALUE klass, VALUE (*func) _((VALUE)))
{
Check_Type(klass, T_CLASS);
rb_add_method(CLASS_OF(klass), ID_ALLOCATOR, NEW_CFUNC(func, 0),
NOEX_PRIVATE);
}
void
rb_undef_alloc_func(VALUE klass)
{
Check_Type(klass, T_CLASS);
rb_add_method(CLASS_OF(klass), ID_ALLOCATOR, 0, NOEX_UNDEF);
}
static NODE *
search_method(VALUE klass, ID id, VALUE *klassp)
{
NODE *body;
if (!klass) {
return 0;
}
while (!st_lookup(RCLASS(klass)->m_tbl, id, (st_data_t *) & body)) {
klass = RCLASS(klass)->super;
if (!klass)
return 0;
}
if (klassp) {
*klassp = klass;
}
return body;
}
/*
* search method body (NODE_METHOD)
* with : klass and id
* without : method cache
*
* if you need method node with method cache, use
* rb_method_node()
*/
NODE *
rb_get_method_body(VALUE klass, ID id, ID *idp)
{
NODE *volatile fbody, *body;
NODE *method;
if ((fbody = search_method(klass, id, 0)) == 0 || !fbody->nd_body) {
/* store empty info in cache */
struct cache_entry *ent;
ent = cache + EXPR1(klass, id);
ent->klass = klass;
ent->mid = ent->mid0 = id;
ent->method = 0;
return 0;
}
method = fbody->nd_body;
if (ruby_running) {
/* store in cache */
struct cache_entry *ent;
ent = cache + EXPR1(klass, id);
ent->klass = klass;
ent->mid = id;
ent->mid0 = fbody->nd_oid;
ent->method = body = method;
}
else {
body = method;
}
if (idp) {
*idp = fbody->nd_oid;
}
return body;
}
NODE *
rb_method_node(VALUE klass, ID id)
{
struct cache_entry *ent;
ent = cache + EXPR1(klass, id);
if (ent->mid == id && ent->klass == klass && ent->method) {
return ent->method;
}
return rb_get_method_body(klass, id, 0);
}
static void
remove_method(VALUE klass, ID mid)
{
NODE *body;
if (klass == rb_cObject) {
rb_secure(4);
}
if (rb_safe_level() >= 4 && !OBJ_TAINTED(klass)) {
rb_raise(rb_eSecurityError, "Insecure: can't remove method");
}
if (OBJ_FROZEN(klass))
rb_error_frozen("class/module");
if (mid == object_id || mid == __send || mid == __send_bang || mid == init) {
rb_warn("removing `%s' may cause serious problem", rb_id2name(mid));
}
if (!st_delete(RCLASS(klass)->m_tbl, &mid, (st_data_t *) & body) ||
!body->nd_body) {
rb_name_error(mid, "method `%s' not defined in %s",
rb_id2name(mid), rb_class2name(klass));
}
rb_clear_cache_for_undef(klass, mid);
if (FL_TEST(klass, FL_SINGLETON)) {
rb_funcall(rb_iv_get(klass, "__attached__"), singleton_removed, 1,
ID2SYM(mid));
}
else {
rb_funcall(klass, removed, 1, ID2SYM(mid));
}
}
void
rb_remove_method(VALUE klass, const char *name)
{
remove_method(klass, rb_intern(name));
}
/*
* call-seq:
* remove_method(symbol) => self
*
* Removes the method identified by _symbol_ from the current
* class. For an example, see <code>Module.undef_method</code>.
*/
static VALUE
rb_mod_remove_method(int argc, VALUE *argv, VALUE mod)
{
int i;
for (i = 0; i < argc; i++) {
remove_method(mod, rb_to_id(argv[i]));
}
return mod;
}
#undef rb_disable_super
#undef rb_enable_super
void
rb_disable_super(VALUE klass, const char *name)
{
/* obsolete - no use */
}
void
rb_enable_super(VALUE klass, const char *name)
{
rb_warning("rb_enable_super() is obsolete");
}
static void
rb_export_method(VALUE klass, ID name, ID noex)
{
NODE *fbody;
VALUE origin;
if (klass == rb_cObject) {
rb_secure(4);
}
fbody = search_method(klass, name, &origin);
if (!fbody && TYPE(klass) == T_MODULE) {
fbody = search_method(rb_cObject, name, &origin);
}
if (!fbody || !fbody->nd_body) {
print_undef(klass, name);
}
if (fbody->nd_body->nd_noex != noex) {
if (klass == origin) {
fbody->nd_body->nd_noex = noex;
}
else {
rb_add_method(klass, name, NEW_ZSUPER(), noex);
}
}
}
int
rb_method_boundp(VALUE klass, ID id, int ex)
{
NODE *method;
if ((method = rb_method_node(klass, id)) != 0) {
if (ex && (method->nd_noex & NOEX_PRIVATE)) {
return Qfalse;
}
return Qtrue;
}
return Qfalse;
}
void
rb_attr(VALUE klass, ID id, int read, int write, int ex)
{
const char *name;
char *buf;
ID attriv;
int noex;
size_t len;
if (!ex) {
noex = NOEX_PUBLIC;
}
else {
if (SCOPE_TEST(NOEX_PRIVATE)) {
noex = NOEX_PRIVATE;
rb_warning((SCOPE_CHECK(NOEX_MODFUNC)) ?
"attribute accessor as module_function" :
"private attribute?");
}
else if (SCOPE_TEST(NOEX_PROTECTED)) {
noex = NOEX_PROTECTED;
}
else {
noex = NOEX_PUBLIC;
}
}
if (!rb_is_local_id(id) && !rb_is_const_id(id)) {
rb_name_error(id, "invalid attribute name `%s'", rb_id2name(id));
}
name = rb_id2name(id);
if (!name) {
rb_raise(rb_eArgError, "argument needs to be symbol or string");
}
len = strlen(name) + 2;
buf = ALLOCA_N(char, len);
snprintf(buf, len, "@%s", name);
attriv = rb_intern(buf);
if (read) {
rb_add_method(klass, id, NEW_IVAR(attriv), noex);
}
if (write) {
rb_add_method(klass, rb_id_attrset(id), NEW_ATTRSET(attriv), noex);
}
}
void
rb_undef(VALUE klass, ID id)
{
VALUE origin;
NODE *body;
if (ruby_cbase() == rb_cObject && klass == rb_cObject) {
rb_secure(4);
}
if (rb_safe_level() >= 4 && !OBJ_TAINTED(klass)) {
rb_raise(rb_eSecurityError, "Insecure: can't undef `%s'",
rb_id2name(id));
}
rb_frozen_class_p(klass);
if (id == object_id || id == __send || id == __send_bang || id == init) {
rb_warn("undefining `%s' may cause serious problem", rb_id2name(id));
}
body = search_method(klass, id, &origin);
if (!body || !body->nd_body) {
char *s0 = " class";
VALUE c = klass;
if (FL_TEST(c, FL_SINGLETON)) {
VALUE obj = rb_iv_get(klass, "__attached__");
switch (TYPE(obj)) {
case T_MODULE:
case T_CLASS:
c = obj;
s0 = "";
}
}
else if (TYPE(c) == T_MODULE) {
s0 = " module";
}
rb_name_error(id, "undefined method `%s' for%s `%s'",
rb_id2name(id), s0, rb_class2name(c));
}
rb_add_method(klass, id, 0, NOEX_PUBLIC);
if (FL_TEST(klass, FL_SINGLETON)) {
rb_funcall(rb_iv_get(klass, "__attached__"),
singleton_undefined, 1, ID2SYM(id));
}
else {
rb_funcall(klass, undefined, 1, ID2SYM(id));
}
}
/*
* call-seq:
* undef_method(symbol) => self
*
* Prevents the current class from responding to calls to the named
* method. Contrast this with <code>remove_method</code>, which deletes
* the method from the particular class; Ruby will still search
* superclasses and mixed-in modules for a possible receiver.
*
* class Parent
* def hello
* puts "In parent"
* end
* end
* class Child < Parent
* def hello
* puts "In child"
* end
* end
*
*
* c = Child.new
* c.hello
*
*
* class Child
* remove_method :hello # remove from child, still in parent
* end
* c.hello
*
*
* class Child
* undef_method :hello # prevent any calls to 'hello'
* end
* c.hello
*
* <em>produces:</em>
*
* In child
* In parent
* prog.rb:23: undefined method `hello' for #<Child:0x401b3bb4> (NoMethodError)
*/
static VALUE
rb_mod_undef_method(int argc, VALUE *argv, VALUE mod)
{
int i;
for (i = 0; i < argc; i++) {
rb_undef(mod, rb_to_id(argv[i]));
}
return mod;
}
void
rb_alias(VALUE klass, ID name, ID def)
{
NODE *orig_fbody, *node;
VALUE singleton = 0;
rb_frozen_class_p(klass);
if (name == def)
return;
if (klass == rb_cObject) {
rb_secure(4);
}
orig_fbody = search_method(klass, def, 0);
if (!orig_fbody || !orig_fbody->nd_body) {
if (TYPE(klass) == T_MODULE) {
orig_fbody = search_method(rb_cObject, def, 0);
}
}
if (!orig_fbody || !orig_fbody->nd_body) {
print_undef(klass, def);
}
if (FL_TEST(klass, FL_SINGLETON)) {
singleton = rb_iv_get(klass, "__attached__");
}
orig_fbody->nd_cnt++;
if (RTEST(ruby_verbose) &&
st_lookup(RCLASS(klass)->m_tbl, name, (st_data_t *) & node)) {
if (node && node->nd_cnt == 0 && node->nd_body) {
rb_warning("discarding old %s", rb_id2name(name));
}
}
st_insert(RCLASS(klass)->m_tbl, name,
(st_data_t) NEW_FBODY(
NEW_METHOD(orig_fbody->nd_body->nd_body,
orig_fbody->nd_body->nd_clss,
orig_fbody->nd_body->nd_noex), def));
rb_clear_cache_by_id(name);
if (singleton) {
rb_funcall(singleton, singleton_added, 1, ID2SYM(name));
}
else {
rb_funcall(klass, added, 1, ID2SYM(name));
}
}
/*
* call-seq:
* alias_method(new_name, old_name) => self
*
* Makes <i>new_name</i> a new copy of the method <i>old_name</i>. This can
* be used to retain access to methods that are overridden.
*
* module Mod
* alias_method :orig_exit, :exit
* def exit(code=0)
* puts "Exiting with code #{code}"
* orig_exit(code)
* end
* end
* include Mod
* exit(99)
*
* <em>produces:</em>
*
* Exiting with code 99
*/
static VALUE
rb_mod_alias_method(VALUE mod, VALUE newname, VALUE oldname)
{
rb_alias(mod, rb_to_id(newname), rb_to_id(oldname));
return mod;
}