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/*
** error.c - Exception class
**
** See Copyright Notice in mruby.h
*/
#include "mruby.h"
#include <stdarg.h>
#include <stdio.h>
#include <setjmp.h>
#include "error.h"
#include "mruby/variable.h"
#include "mruby/string.h"
#include "mruby/class.h"
#define warn_printf printf
mrb_value
mrb_exc_new(mrb_state *mrb, struct RClass *c, const char *ptr, long len)
{
return mrb_funcall(mrb, mrb_obj_value(c), "new", 1, mrb_str_new(mrb, ptr, len));
}
mrb_value
mrb_exc_new3(mrb_state *mrb, struct RClass* c, mrb_value str)
{
//StringValue(str);
mrb_string_value(mrb, &str);
return mrb_funcall(mrb, mrb_obj_value(c), "new", 1, str);
}
/*
* call-seq:
* Exception.new(msg = nil) -> exception
*
* Construct a new Exception object, optionally passing in
* a message.
*/
static mrb_value
exc_initialize(mrb_state *mrb, mrb_value exc)
{
mrb_value mesg;
if (mrb_get_args(mrb, "|o", &mesg) == 1) {
mrb_iv_set(mrb, exc, mrb_intern(mrb, "mesg"), mesg);
}
return exc;
}
/*
* Document-method: exception
*
* call-seq:
* exc.exception(string) -> an_exception or exc
*
* With no argument, or if the argument is the same as the receiver,
* return the receiver. Otherwise, create a new
* exception object of the same class as the receiver, but with a
* message equal to <code>string.to_str</code>.
*
*/
static mrb_value
exc_exception(mrb_state *mrb, mrb_value self)
{
mrb_value exc;
mrb_value a;
int argc;
argc = mrb_get_args(mrb, "|o", &a);
if (argc == 0) return self;
if (mrb_obj_equal(mrb, self, a)) return self;
exc = mrb_obj_clone(mrb, self);
mrb_iv_set(mrb, exc, mrb_intern(mrb, "mesg"), a);
return exc;
}
/*
* call-seq:
* exception.to_s -> string
*
* Returns exception's message (or the name of the exception if
* no message is set).
*/
static mrb_value
exc_to_s(mrb_state *mrb, mrb_value exc)
{
mrb_value mesg = mrb_attr_get(mrb, exc, mrb_intern(mrb, "mesg"));
if (mrb_nil_p(mesg)) return mrb_str_new2(mrb, mrb_obj_classname(mrb, exc));
return mesg;
}
/*
* call-seq:
* exception.message -> string
*
* Returns the result of invoking <code>exception.to_s</code>.
* Normally this returns the exception's message or name. By
* supplying a to_str method, exceptions are agreeing to
* be used where Strings are expected.
*/
static mrb_value
exc_message(mrb_state *mrb, mrb_value exc)
{
return mrb_funcall(mrb, exc, "to_s", 0);
}
/*
* call-seq:
* exception.inspect -> string
*
* Return this exception's class name an message
*/
static mrb_value
exc_inspect(mrb_state *mrb, mrb_value exc)
{
mrb_value str;
str = mrb_str_new2(mrb, mrb_obj_classname(mrb, exc));
exc = mrb_obj_as_string(mrb, exc);
if (RSTRING_LEN(exc) > 0) {
mrb_str_cat2(mrb, str, ": ");
mrb_str_append(mrb, str, exc);
}
return str;
}
static mrb_value
exc_equal(mrb_state *mrb, mrb_value exc)
{
mrb_value obj;
mrb_value mesg;
mrb_sym id_mesg = mrb_intern(mrb, "mesg");
mrb_get_args(mrb, "o", &obj);
if (mrb_obj_equal(mrb, exc, obj)) return mrb_true_value();
if (mrb_obj_class(mrb, exc) != mrb_obj_class(mrb, obj)) {
if (mrb_respond_to(mrb, obj, mrb_intern(mrb, "message"))) {
mesg = mrb_funcall(mrb, obj, "message", 0);
}
else
return mrb_false_value();
}
else {
mesg = mrb_attr_get(mrb, obj, id_mesg);
}
if (!mrb_equal(mrb, mrb_attr_get(mrb, exc, id_mesg), mesg))
return mrb_false_value();
return mrb_true_value();
}
void
mrb_exc_raise(mrb_state *mrb, mrb_value exc)
{
mrb->exc = (struct RObject*)mrb_object(exc);
longjmp(*(jmp_buf*)mrb->jmp, 1);
}
void
mrb_raise(mrb_state *mrb, struct RClass *c, const char *fmt, ...)
{
va_list args;
char buf[256];
int n;
va_start(args, fmt);
n = vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
if (n < 0) {
n = 0;
}
mrb_exc_raise(mrb, mrb_exc_new(mrb, c, buf, n));
}
void
mrb_name_error(mrb_state *mrb, mrb_sym id, const char *fmt, ...)
{
mrb_value exc, argv[2];
va_list args;
char buf[256];
int n;
va_start(args, fmt);
n = vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
if (n < 0) {
n = 0;
}
argv[0] = mrb_str_new(mrb, buf, n);
argv[1] = mrb_symbol_value(id); /* ignore now */
exc = mrb_class_new_instance(mrb, 1, argv, E_NAME_ERROR);
mrb_exc_raise(mrb, exc);
}
mrb_value
mrb_sprintf(mrb_state *mrb, const char *fmt, ...)
{
va_list args;
char buf[256];
int n;
va_start(args, fmt);
n = vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
if (n < 0) {
n = 0;
}
return mrb_str_new(mrb, buf, n);
}
void
mrb_warn(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
printf("warning: ");
vprintf(fmt, args);
va_end(args);
}
void
mrb_bug(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
printf("bug: ");
vprintf(fmt, args);
va_end(args);
exit(EXIT_FAILURE);
}
static const char *
mrb_strerrno(int err)
{
#define defined_error(name, num) if (err == num) return name;
#define undefined_error(name)
//#include "known_errors.inc"
#undef defined_error
#undef undefined_error
return NULL;
}
void
mrb_bug_errno(const char *mesg, int errno_arg)
{
if (errno_arg == 0)
mrb_bug("%s: errno == 0 (NOERROR)", mesg);
else {
const char *errno_str = mrb_strerrno(errno_arg);
if (errno_str)
mrb_bug("%s: %s (%s)", mesg, strerror(errno_arg), errno_str);
else
mrb_bug("%s: %s (%d)", mesg, strerror(errno_arg), errno_arg);
}
}
int
sysexit_status(mrb_state *mrb, mrb_value err)
{
mrb_value st = mrb_iv_get(mrb, err, mrb_intern(mrb, "status"));
return mrb_fixnum(st);
}
static void
set_backtrace(mrb_state *mrb, mrb_value info, mrb_value bt)
{
mrb_funcall(mrb, info, "set_backtrace", 1, bt);
}
mrb_value
make_exception(mrb_state *mrb, int argc, mrb_value *argv, int isstr)
{
mrb_value mesg;
int n;
mesg = mrb_nil_value();
switch (argc) {
case 0:
break;
case 1:
if (mrb_nil_p(argv[0]))
break;
if (isstr) {
mesg = mrb_check_string_type(mrb, argv[0]);
if (!mrb_nil_p(mesg)) {
mesg = mrb_exc_new3(mrb, E_RUNTIME_ERROR, mesg);
break;
}
}
n = 0;
goto exception_call;
case 2:
case 3:
n = 1;
exception_call:
{
mrb_sym exc = mrb_intern(mrb, "exception");
if (mrb_respond_to(mrb, argv[0], exc)) {
mesg = mrb_funcall_argv(mrb, argv[0], exc, n, argv+1);
}
else {
/* undef */
mrb_raise(mrb, E_TYPE_ERROR, "exception class/object expected");
}
}
break;
default:
mrb_raise(mrb, E_ARGUMENT_ERROR, "wrong number of arguments (%d for 0..3)", argc);
break;
}
if (argc > 0) {
if (!mrb_obj_is_kind_of(mrb, mesg, mrb->eException_class))
mrb_raise(mrb, E_TYPE_ERROR, "exception object expected");
if (argc > 2)
set_backtrace(mrb, mesg, argv[2]);
}
return mesg;
}
mrb_value
mrb_make_exception(mrb_state *mrb, int argc, mrb_value *argv)
{
return make_exception(mrb, argc, argv, TRUE);
}
void
mrb_sys_fail(mrb_state *mrb, const char *mesg)
{
mrb_raise(mrb, E_RUNTIME_ERROR, "%s", mesg);
}
void
mrb_init_exception(mrb_state *mrb)
{
struct RClass *e;
mrb->eException_class = e = mrb_define_class(mrb, "Exception", mrb->object_class); /* 15.2.22 */
mrb_define_class_method(mrb, e, "exception", mrb_instance_new, ARGS_ANY());
mrb_define_method(mrb, e, "exception", exc_exception, ARGS_ANY());
mrb_define_method(mrb, e, "initialize", exc_initialize, ARGS_ANY());
mrb_define_method(mrb, e, "==", exc_equal, ARGS_REQ(1));
mrb_define_method(mrb, e, "to_s", exc_to_s, ARGS_NONE());
mrb_define_method(mrb, e, "message", exc_message, ARGS_NONE());
mrb_define_method(mrb, e, "inspect", exc_inspect, ARGS_NONE());
mrb->eStandardError_class = mrb_define_class(mrb, "StandardError", mrb->eException_class); /* 15.2.23 */
mrb_define_class(mrb, "RuntimeError", mrb->eStandardError_class); /* 15.2.28 */
}
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