/
eval.c
1568 lines (1386 loc) · 34.9 KB
/
eval.c
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/**********************************************************************
eval.c -
$Author$
created at: Thu Jun 10 14:22:17 JST 1993
Copyright (C) 1993-2007 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#include "eval_intern.h"
#include "iseq.h"
#include "gc.h"
#include "ruby/vm.h"
#include "ruby/encoding.h"
#include "internal.h"
#include "vm_core.h"
#include "probes_helper.h"
#define numberof(array) (int)(sizeof(array) / sizeof((array)[0]))
NORETURN(void rb_raise_jump(VALUE));
NODE *rb_vm_get_cref(const rb_iseq_t *, const VALUE *);
VALUE rb_eLocalJumpError;
VALUE rb_eSysStackError;
#define exception_error GET_VM()->special_exceptions[ruby_error_reenter]
#include "eval_error.c"
#include "eval_jump.c"
/* Initializes the Ruby VM and builtin libraries.
* @retval 0 if succeeded.
* @retval non-zero an error occured.
*/
int
ruby_setup(void)
{
static int initialized = 0;
int state;
if (initialized)
return 0;
initialized = 1;
ruby_init_stack((void *)&state);
Init_BareVM();
Init_heap();
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
rb_call_inits();
ruby_prog_init();
GET_VM()->running = 1;
}
POP_TAG();
return state;
}
/* Calls ruby_setup() and check error.
*
* Prints errors and calls exit(3) if an error occured.
*/
void
ruby_init(void)
{
int state = ruby_setup();
if (state) {
error_print();
exit(EXIT_FAILURE);
}
}
/*! Processes command line arguments and compiles the Ruby source to execute.
*
* This function does:
* \li Processses the given command line flags and arguments for ruby(1)
* \li compiles the source code from the given argument, -e or stdin, and
* \li returns the compiled source as an opaque pointer to an internal data structure
*
* @return an opaque pointer to the compiled source or an internal special value.
* @sa ruby_executable_node().
*/
void *
ruby_options(int argc, char **argv)
{
int state;
void *volatile iseq = 0;
ruby_init_stack((void *)&iseq);
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
SAVE_ROOT_JMPBUF(GET_THREAD(), iseq = ruby_process_options(argc, argv));
}
else {
rb_clear_trace_func();
state = error_handle(state);
iseq = (void *)INT2FIX(state);
}
POP_TAG();
return iseq;
}
static void
ruby_finalize_0(void)
{
PUSH_TAG();
if (EXEC_TAG() == 0) {
rb_trap_exit();
}
POP_TAG();
rb_exec_end_proc();
rb_clear_trace_func();
}
static void
ruby_finalize_1(void)
{
ruby_sig_finalize();
GET_THREAD()->errinfo = Qnil;
rb_gc_call_finalizer_at_exit();
}
/** Runs the VM finalization processes.
*
* <code>END{}</code> and procs registered by <code>Kernel.#at_exit</code> are
* executed here. See the Ruby language spec for more details.
*
* @note This function is allowed to raise an exception if an error occurred.
*/
void
ruby_finalize(void)
{
ruby_finalize_0();
ruby_finalize_1();
}
/** Destructs the VM.
*
* Runs the VM finalization processes as well as ruby_finalize(), and frees
* resources used by the VM.
*
* @param ex Default value to the return value.
* @return If an error occured returns a non-zero. If otherwise, returns the
* given ex.
* @note This function does not raise any exception.
*/
int
ruby_cleanup(volatile int ex)
{
int state;
volatile VALUE errs[2];
rb_thread_t *th = GET_THREAD();
int nerr;
rb_threadptr_interrupt(th);
rb_threadptr_check_signal(th);
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
SAVE_ROOT_JMPBUF(th, { RUBY_VM_CHECK_INTS(th); });
}
POP_TAG();
errs[1] = th->errinfo;
th->safe_level = 0;
ruby_init_stack(&errs[STACK_UPPER(errs, 0, 1)]);
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
SAVE_ROOT_JMPBUF(th, ruby_finalize_0());
}
POP_TAG();
/* protect from Thread#raise */
th->status = THREAD_KILLED;
errs[0] = th->errinfo;
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
SAVE_ROOT_JMPBUF(th, rb_thread_terminate_all());
}
else if (ex == 0) {
ex = state;
}
th->errinfo = errs[1];
ex = error_handle(ex);
ruby_finalize_1();
/* unlock again if finalizer took mutexes. */
rb_threadptr_unlock_all_locking_mutexes(GET_THREAD());
POP_TAG();
rb_thread_stop_timer_thread(1);
#if EXIT_SUCCESS != 0 || EXIT_FAILURE != 1
switch (ex) {
#if EXIT_SUCCESS != 0
case 0: ex = EXIT_SUCCESS; break;
#endif
#if EXIT_FAILURE != 1
case 1: ex = EXIT_FAILURE; break;
#endif
}
#endif
state = 0;
for (nerr = 0; nerr < numberof(errs); ++nerr) {
VALUE err = errs[nerr];
if (!RTEST(err)) continue;
/* th->errinfo contains a NODE while break'ing */
if (RB_TYPE_P(err, T_NODE)) continue;
if (rb_obj_is_kind_of(err, rb_eSystemExit)) {
ex = sysexit_status(err);
break;
}
else if (rb_obj_is_kind_of(err, rb_eSignal)) {
VALUE sig = rb_iv_get(err, "signo");
state = NUM2INT(sig);
break;
}
else if (ex == EXIT_SUCCESS) {
ex = EXIT_FAILURE;
}
}
ruby_vm_destruct(GET_VM());
if (state) ruby_default_signal(state);
return ex;
}
static int
ruby_exec_internal(void *n)
{
volatile int state;
VALUE iseq = (VALUE)n;
rb_thread_t *th = GET_THREAD();
if (!n) return 0;
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
SAVE_ROOT_JMPBUF(th, {
th->base_block = 0;
rb_iseq_eval_main(iseq);
});
}
POP_TAG();
return state;
}
/*! Calls ruby_cleanup() and exits the process */
void
ruby_stop(int ex)
{
exit(ruby_cleanup(ex));
}
/*! Checks the return value of ruby_options().
* @param n return value of ruby_options().
* @param status pointer to the exit status of this process.
*
* ruby_options() sometimes returns a special value to indicate this process
* should immediately exit. This function checks if the case. Also stores the
* exit status that the caller have to pass to exit(3) into
* <code>*status</code>.
*
* @retval non-zero if the given opaque pointer is actually a compiled source.
* @retval 0 if the given value is such a special value.
*/
int
ruby_executable_node(void *n, int *status)
{
VALUE v = (VALUE)n;
int s;
switch (v) {
case Qtrue: s = EXIT_SUCCESS; break;
case Qfalse: s = EXIT_FAILURE; break;
default:
if (!FIXNUM_P(v)) return TRUE;
s = FIX2INT(v);
}
if (status) *status = s;
return FALSE;
}
/*! Runs the given compiled source and exits this process.
* @retval 0 if successfully run thhe source
* @retval non-zero if an error occurred.
*/
int
ruby_run_node(void *n)
{
int status;
if (!ruby_executable_node(n, &status)) {
ruby_cleanup(0);
return status;
}
return ruby_cleanup(ruby_exec_node(n));
}
/*! Runs the given compiled source */
int
ruby_exec_node(void *n)
{
ruby_init_stack((void *)&n);
return ruby_exec_internal(n);
}
/*
* call-seq:
* Module.nesting -> array
*
* Returns the list of +Modules+ nested at the point of call.
*
* module M1
* module M2
* $a = Module.nesting
* end
* end
* $a #=> [M1::M2, M1]
* $a[0].name #=> "M1::M2"
*/
static VALUE
rb_mod_nesting(void)
{
VALUE ary = rb_ary_new();
const NODE *cref = rb_vm_cref();
while (cref && cref->nd_next) {
VALUE klass = cref->nd_clss;
if (!(cref->flags & NODE_FL_CREF_PUSHED_BY_EVAL) &&
!NIL_P(klass)) {
rb_ary_push(ary, klass);
}
cref = cref->nd_next;
}
return ary;
}
/*
* call-seq:
* Module.constants -> array
* Module.constants(inherited) -> array
*
* In the first form, returns an array of the names of all
* constants accessible from the point of call.
* This list includes the names of all modules and classes
* defined in the global scope.
*
* Module.constants.first(4)
* # => [:ARGF, :ARGV, :ArgumentError, :Array]
*
* Module.constants.include?(:SEEK_SET) # => false
*
* class IO
* Module.constants.include?(:SEEK_SET) # => true
* end
*
* The second form calls the instance method +constants+.
*/
static VALUE
rb_mod_s_constants(int argc, VALUE *argv, VALUE mod)
{
const NODE *cref = rb_vm_cref();
VALUE klass;
VALUE cbase = 0;
void *data = 0;
if (argc > 0) {
return rb_mod_constants(argc, argv, rb_cModule);
}
while (cref) {
klass = cref->nd_clss;
if (!(cref->flags & NODE_FL_CREF_PUSHED_BY_EVAL) &&
!NIL_P(klass)) {
data = rb_mod_const_at(cref->nd_clss, data);
if (!cbase) {
cbase = klass;
}
}
cref = cref->nd_next;
}
if (cbase) {
data = rb_mod_const_of(cbase, data);
}
return rb_const_list(data);
}
void
rb_frozen_class_p(VALUE klass)
{
const char *desc = "something(?!)";
if (OBJ_FROZEN(klass)) {
if (FL_TEST(klass, FL_SINGLETON))
desc = "object";
else {
switch (TYPE(klass)) {
case T_MODULE:
case T_ICLASS:
desc = "module";
break;
case T_CLASS:
desc = "class";
break;
}
}
rb_error_frozen(desc);
}
}
NORETURN(static void rb_longjmp(int, volatile VALUE));
static void
setup_exception(rb_thread_t *th, int tag, volatile VALUE mesg)
{
VALUE at;
VALUE e;
const char *file;
volatile int line = 0;
if (NIL_P(mesg)) {
mesg = th->errinfo;
if (INTERNAL_EXCEPTION_P(mesg)) JUMP_TAG(TAG_FATAL);
}
if (NIL_P(mesg)) {
mesg = rb_exc_new(rb_eRuntimeError, 0, 0);
}
file = rb_sourcefile();
if (file) line = rb_sourceline();
if (file && !NIL_P(mesg)) {
if (mesg == sysstack_error) {
at = rb_enc_sprintf(rb_usascii_encoding(), "%s:%d", file, line);
at = rb_ary_new3(1, at);
rb_iv_set(mesg, "bt", at);
}
else {
at = get_backtrace(mesg);
if (NIL_P(at)) {
at = rb_vm_backtrace_object();
if (OBJ_FROZEN(mesg)) {
mesg = rb_obj_dup(mesg);
}
set_backtrace(mesg, at);
}
}
}
if (!NIL_P(mesg)) {
th->errinfo = mesg;
}
if (RTEST(ruby_debug) && !NIL_P(e = th->errinfo) &&
!rb_obj_is_kind_of(e, rb_eSystemExit)) {
int status;
PUSH_TAG();
if ((status = EXEC_TAG()) == 0) {
RB_GC_GUARD(e) = rb_obj_as_string(e);
if (file && line) {
warn_printf("Exception `%s' at %s:%d - %s\n",
rb_obj_classname(th->errinfo),
file, line, RSTRING_PTR(e));
}
else if (file) {
warn_printf("Exception `%s' at %s - %s\n",
rb_obj_classname(th->errinfo),
file, RSTRING_PTR(e));
}
else {
warn_printf("Exception `%s' - %s\n",
rb_obj_classname(th->errinfo),
RSTRING_PTR(e));
}
}
POP_TAG();
if (status == TAG_FATAL && th->errinfo == exception_error) {
th->errinfo = mesg;
}
else if (status) {
rb_threadptr_reset_raised(th);
JUMP_TAG(status);
}
}
if (rb_threadptr_set_raised(th)) {
th->errinfo = exception_error;
rb_threadptr_reset_raised(th);
JUMP_TAG(TAG_FATAL);
}
if (tag != TAG_FATAL) {
if (RUBY_DTRACE_RAISE_ENABLED()) {
RUBY_DTRACE_RAISE(rb_obj_classname(th->errinfo),
rb_sourcefile(),
rb_sourceline());
}
EXEC_EVENT_HOOK(th, RUBY_EVENT_RAISE, th->cfp->self, 0, 0, mesg);
}
}
static void
rb_longjmp(int tag, volatile VALUE mesg)
{
rb_thread_t *th = GET_THREAD();
setup_exception(th, tag, mesg);
rb_thread_raised_clear(th);
JUMP_TAG(tag);
}
static VALUE make_exception(int argc, VALUE *argv, int isstr);
void
rb_exc_raise(VALUE mesg)
{
if (!NIL_P(mesg)) {
mesg = make_exception(1, &mesg, FALSE);
}
rb_longjmp(TAG_RAISE, mesg);
}
void
rb_exc_fatal(VALUE mesg)
{
if (!NIL_P(mesg)) {
mesg = make_exception(1, &mesg, FALSE);
}
rb_longjmp(TAG_FATAL, mesg);
}
void
rb_interrupt(void)
{
rb_raise(rb_eInterrupt, "%s", "");
}
static VALUE get_errinfo(void);
/*
* call-seq:
* raise
* raise(string)
* raise(exception [, string [, array]])
* fail
* fail(string)
* fail(exception [, string [, array]])
*
* With no arguments, raises the exception in <code>$!</code> or raises
* a <code>RuntimeError</code> if <code>$!</code> is +nil+.
* With a single +String+ argument, raises a
* +RuntimeError+ with the string as a message. Otherwise,
* the first parameter should be the name of an +Exception+
* class (or an object that returns an +Exception+ object when sent
* an +exception+ message). The optional second parameter sets the
* message associated with the exception, and the third parameter is an
* array of callback information. Exceptions are caught by the
* +rescue+ clause of <code>begin...end</code> blocks.
*
* raise "Failed to create socket"
* raise ArgumentError, "No parameters", caller
*/
static VALUE
rb_f_raise(int argc, VALUE *argv)
{
VALUE err;
if (argc == 0) {
err = get_errinfo();
if (!NIL_P(err)) {
argc = 1;
argv = &err;
}
}
rb_raise_jump(rb_make_exception(argc, argv));
UNREACHABLE;
}
static VALUE
make_exception(int argc, VALUE *argv, int isstr)
{
VALUE mesg;
ID exception;
int n;
mesg = Qnil;
switch (argc) {
case 0:
break;
case 1:
if (NIL_P(argv[0]))
break;
if (isstr) {
mesg = rb_check_string_type(argv[0]);
if (!NIL_P(mesg)) {
mesg = rb_exc_new3(rb_eRuntimeError, mesg);
break;
}
}
n = 0;
goto exception_call;
case 2:
case 3:
n = 1;
exception_call:
if (argv[0] == sysstack_error) return argv[0];
CONST_ID(exception, "exception");
mesg = rb_check_funcall(argv[0], exception, n, argv+1);
if (mesg == Qundef) {
rb_raise(rb_eTypeError, "exception class/object expected");
}
break;
default:
rb_check_arity(argc, 0, 3);
break;
}
if (argc > 0) {
if (!rb_obj_is_kind_of(mesg, rb_eException))
rb_raise(rb_eTypeError, "exception object expected");
if (argc > 2)
set_backtrace(mesg, argv[2]);
}
return mesg;
}
VALUE
rb_make_exception(int argc, VALUE *argv)
{
return make_exception(argc, argv, TRUE);
}
void
rb_raise_jump(VALUE mesg)
{
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *cfp = th->cfp;
VALUE klass = cfp->me->klass;
VALUE self = cfp->self;
ID mid = cfp->me->called_id;
th->cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(th->cfp);
setup_exception(th, TAG_RAISE, mesg);
EXEC_EVENT_HOOK(th, RUBY_EVENT_C_RETURN, self, mid, klass, Qnil);
rb_thread_raised_clear(th);
JUMP_TAG(TAG_RAISE);
}
void
rb_jump_tag(int tag)
{
JUMP_TAG(tag);
}
int
rb_block_given_p(void)
{
rb_thread_t *th = GET_THREAD();
if (rb_vm_control_frame_block_ptr(th->cfp)) {
return TRUE;
}
else {
return FALSE;
}
}
int
rb_iterator_p(void)
{
return rb_block_given_p();
}
VALUE rb_eThreadError;
void
rb_need_block(void)
{
if (!rb_block_given_p()) {
rb_vm_localjump_error("no block given", Qnil, 0);
}
}
VALUE
rb_rescue2(VALUE (* b_proc) (ANYARGS), VALUE data1,
VALUE (* r_proc) (ANYARGS), VALUE data2, ...)
{
int state;
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *cfp = th->cfp;
volatile VALUE result;
volatile VALUE e_info = th->errinfo;
va_list args;
TH_PUSH_TAG(th);
if ((state = TH_EXEC_TAG()) == 0) {
retry_entry:
result = (*b_proc) (data1);
}
else {
th->cfp = cfp; /* restore */
if (state == TAG_RAISE) {
int handle = FALSE;
VALUE eclass;
va_init_list(args, data2);
while ((eclass = va_arg(args, VALUE)) != 0) {
if (rb_obj_is_kind_of(th->errinfo, eclass)) {
handle = TRUE;
break;
}
}
va_end(args);
if (handle) {
if (r_proc) {
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
result = (*r_proc) (data2, th->errinfo);
}
POP_TAG();
if (state == TAG_RETRY) {
state = 0;
th->errinfo = Qnil;
goto retry_entry;
}
}
else {
result = Qnil;
state = 0;
}
if (state == 0) {
th->errinfo = e_info;
}
}
}
}
TH_POP_TAG();
if (state)
JUMP_TAG(state);
return result;
}
VALUE
rb_rescue(VALUE (* b_proc)(ANYARGS), VALUE data1,
VALUE (* r_proc)(ANYARGS), VALUE data2)
{
return rb_rescue2(b_proc, data1, r_proc, data2, rb_eStandardError,
(VALUE)0);
}
VALUE
rb_protect(VALUE (* proc) (VALUE), VALUE data, int * state)
{
volatile VALUE result = Qnil;
int status;
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *cfp = th->cfp;
struct rb_vm_protect_tag protect_tag;
rb_jmpbuf_t org_jmpbuf;
protect_tag.prev = th->protect_tag;
TH_PUSH_TAG(th);
th->protect_tag = &protect_tag;
MEMCPY(&org_jmpbuf, &(th)->root_jmpbuf, rb_jmpbuf_t, 1);
if ((status = TH_EXEC_TAG()) == 0) {
SAVE_ROOT_JMPBUF(th, result = (*proc) (data));
}
MEMCPY(&(th)->root_jmpbuf, &org_jmpbuf, rb_jmpbuf_t, 1);
th->protect_tag = protect_tag.prev;
TH_POP_TAG();
if (state) {
*state = status;
}
if (status != 0) {
th->cfp = cfp;
return Qnil;
}
return result;
}
VALUE
rb_ensure(VALUE (*b_proc)(ANYARGS), VALUE data1, VALUE (*e_proc)(ANYARGS), VALUE data2)
{
int state;
volatile VALUE result = Qnil;
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
result = (*b_proc) (data1);
}
POP_TAG();
/* TODO: fix me */
/* retval = prot_tag ? prot_tag->retval : Qnil; */ /* save retval */
(*e_proc) (data2);
if (state)
JUMP_TAG(state);
return result;
}
static const rb_method_entry_t *
method_entry_of_iseq(rb_control_frame_t *cfp, rb_iseq_t *iseq)
{
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *cfp_limit;
cfp_limit = (rb_control_frame_t *)(th->stack + th->stack_size);
while (cfp_limit > cfp) {
if (cfp->iseq == iseq)
return cfp->me;
cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
}
return 0;
}
static ID
frame_func_id(rb_control_frame_t *cfp)
{
const rb_method_entry_t *me_local;
rb_iseq_t *iseq = cfp->iseq;
if (cfp->me) {
return cfp->me->def->original_id;
}
while (iseq) {
if (RUBY_VM_IFUNC_P(iseq)) {
NODE *ifunc = (NODE *)iseq;
if (ifunc->nd_aid) return ifunc->nd_aid;
return rb_intern("<ifunc>");
}
me_local = method_entry_of_iseq(cfp, iseq);
if (me_local) {
cfp->me = me_local;
return me_local->def->original_id;
}
if (iseq->defined_method_id) {
return iseq->defined_method_id;
}
if (iseq->local_iseq == iseq) {
break;
}
iseq = iseq->parent_iseq;
}
return 0;
}
static ID
frame_called_id(rb_control_frame_t *cfp)
{
const rb_method_entry_t *me_local;
rb_iseq_t *iseq = cfp->iseq;
if (cfp->me) {
return cfp->me->called_id;
}
while (iseq) {
if (RUBY_VM_IFUNC_P(iseq)) {
NODE *ifunc = (NODE *)iseq;
if (ifunc->nd_aid) return ifunc->nd_aid;
return rb_intern("<ifunc>");
}
me_local = method_entry_of_iseq(cfp, iseq);
if (me_local) {
cfp->me = me_local;
return me_local->called_id;
}
if (iseq->defined_method_id) {
return iseq->defined_method_id;
}
if (iseq->local_iseq == iseq) {
break;
}
iseq = iseq->parent_iseq;
}
return 0;
}
ID
rb_frame_this_func(void)
{
return frame_func_id(GET_THREAD()->cfp);
}
static rb_control_frame_t *
previous_frame(rb_thread_t *th)
{
rb_control_frame_t *prev_cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(th->cfp);
/* check if prev_cfp can be accessible */
if ((void *)(th->stack + th->stack_size) == (void *)(prev_cfp)) {
return 0;
}
return prev_cfp;
}
ID
rb_frame_callee(void)
{
rb_control_frame_t *prev_cfp = previous_frame(GET_THREAD());
if (!prev_cfp) return 0;
return frame_called_id(prev_cfp);
}
static ID
rb_frame_caller(void)
{
rb_control_frame_t *prev_cfp = previous_frame(GET_THREAD());
if (!prev_cfp) return 0;
return frame_func_id(prev_cfp);
}
void
rb_frame_pop(void)
{
rb_thread_t *th = GET_THREAD();
th->cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(th->cfp);
}
/*
* call-seq:
* append_features(mod) -> mod
*
* When this module is included in another, Ruby calls
* <code>append_features</code> in this module, passing it the
* receiving module in _mod_. Ruby's default implementation is
* to add the constants, methods, and module variables of this module
* to _mod_ if this module has not already been added to
* _mod_ or one of its ancestors. See also <code>Module#include</code>.
*/
static VALUE
rb_mod_append_features(VALUE module, VALUE include)
{
switch (TYPE(include)) {
case T_CLASS:
case T_MODULE:
break;
default:
Check_Type(include, T_CLASS);
break;
}
rb_include_module(include, module);
return module;
}
/*
* call-seq:
* include(module, ...) -> self
*
* Invokes <code>Module.append_features</code> on each parameter in reverse order.
*/
static VALUE
rb_mod_include(int argc, VALUE *argv, VALUE module)
{
int i;
ID id_append_features, id_included;
CONST_ID(id_append_features, "append_features");
CONST_ID(id_included, "included");
for (i = 0; i < argc; i++)
Check_Type(argv[i], T_MODULE);
while (argc--) {
rb_funcall(argv[argc], id_append_features, 1, module);
rb_funcall(argv[argc], id_included, 1, module);
}
return module;
}
/*
* call-seq:
* prepend_features(mod) -> mod
*
* When this module is prepended in another, Ruby calls
* <code>prepend_features</code> in this module, passing it the
* receiving module in _mod_. Ruby's default implementation is
* to overlay the constants, methods, and module variables of this module
* to _mod_ if this module has not already been added to
* _mod_ or one of its ancestors. See also <code>Module#prepend</code>.
*/