eval_error.c

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/* -*-c-*- */
/*
 * included by eval.c
 */

static void
warn_printf(const char *fmt, ...)
{
    VALUE str;
    va_list args;

    va_init_list(args, fmt);
    str = rb_vsprintf(fmt, args);
    va_end(args);
    rb_write_error_str(str);
}

#define warn_print(x) rb_write_error(x)
#define warn_print2(x,l) rb_write_error2((x),(l))
#define warn_print_str(x) rb_write_error_str(x)

static void
error_pos(void)
{
    const char *sourcefile = rb_sourcefile();
    int sourceline = rb_sourceline();

    if (sourcefile) {
        if (sourceline == 0) {
            warn_printf("%s", sourcefile);
        }
        else if (rb_frame_callee()) {
            warn_printf("%s:%d:in `%s'", sourcefile, sourceline,
                        rb_id2name(rb_frame_callee()));
        }
        else {
            warn_printf("%s:%d", sourcefile, sourceline);
        }
    }
}

static VALUE
get_backtrace(VALUE info)
{
    if (NIL_P(info))
        return Qnil;
    info = rb_funcall(info, rb_intern("backtrace"), 0);
    if (NIL_P(info))
        return Qnil;
    return rb_check_backtrace(info);
}

VALUE
rb_get_backtrace(VALUE info)
{
    return get_backtrace(info);
}

VALUE rb_exc_set_backtrace(VALUE exc, VALUE bt);

static void
set_backtrace(VALUE info, VALUE bt)
{
    ID set_backtrace = rb_intern("set_backtrace");

    if (rb_backtrace_p(bt)) {
        if (rb_method_basic_definition_p(CLASS_OF(info), set_backtrace)) {
            rb_exc_set_backtrace(info, bt);
            return;
        }
        else {
            bt = rb_backtrace_to_str_ary(bt);
        }
    }
    rb_funcall(info, rb_intern("set_backtrace"), 1, bt);
}

static void
error_print(void)
{
    volatile VALUE errat = Qnil;                /* OK */
    rb_thread_t *th = GET_THREAD();
    VALUE errinfo = th->errinfo;
    int raised_flag = th->raised_flag;
    volatile VALUE eclass, e;
    const char *volatile einfo;
    volatile long elen;

    if (NIL_P(errinfo))
        return;
    rb_thread_raised_clear(th);

    TH_PUSH_TAG(th);
    if (TH_EXEC_TAG() == 0) {
        errat = get_backtrace(errinfo);
    }
    else {
        errat = Qnil;
    }
    if (TH_EXEC_TAG())
        goto error;
    if (NIL_P(errat)) {
        const char *file = rb_sourcefile();
        int line = rb_sourceline();
        if (!file)
            warn_printf("%d", line);
        else if (!line)
            warn_printf("%s", file);
        else
            warn_printf("%s:%d", file, line);
    }
    else if (RARRAY_LEN(errat) == 0) {
        error_pos();
    }
    else {
        VALUE mesg = RARRAY_PTR(errat)[0];

        if (NIL_P(mesg))
            error_pos();
        else {
            warn_print_str(mesg);
        }
    }

    eclass = CLASS_OF(errinfo);
    if (TH_EXEC_TAG() == 0) {
        e = rb_funcall(errinfo, rb_intern("message"), 0, 0);
        StringValue(e);
        einfo = RSTRING_PTR(e);
        elen = RSTRING_LEN(e);
    }
    else {
        einfo = "";
        elen = 0;
    }
    if (TH_EXEC_TAG())
        goto error;
    if (eclass == rb_eRuntimeError && elen == 0) {
        warn_print(": unhandled exception\n");
    }
    else {
        VALUE epath;

        epath = rb_class_name(eclass);
        if (elen == 0) {
            warn_print(": ");
            warn_print_str(epath);
            warn_print("\n");
        }
        else {
            char *tail = 0;
            long len = elen;

            if (RSTRING_PTR(epath)[0] == '#')
                epath = 0;
            if ((tail = memchr(einfo, '\n', elen)) != 0) {
                len = tail - einfo;
                tail++;         /* skip newline */
            }
            warn_print(": ");
            warn_print2(einfo, len);
            if (epath) {
                warn_print(" (");
                warn_print_str(epath);
                warn_print(")\n");
            }
            if (tail) {
                warn_print2(tail, elen - len - 1);
                if (einfo[elen-1] != '\n') warn_print2("\n", 1);
            }
        }
    }

    if (!NIL_P(errat)) {
        long i;
        long len = RARRAY_LEN(errat);
        VALUE *ptr = RARRAY_PTR(errat);
        int skip = eclass == rb_eSysStackError;

#define TRACE_MAX (TRACE_HEAD+TRACE_TAIL+5)
#define TRACE_HEAD 8
#define TRACE_TAIL 5

        for (i = 1; i < len; i++) {
            if (RB_TYPE_P(ptr[i], T_STRING)) {
                warn_printf("\tfrom %"PRIsVALUE"\n", ptr[i]);
            }
            if (skip && i == TRACE_HEAD && len > TRACE_MAX) {
                warn_printf("\t ... %ld levels...\n",
                            len - TRACE_HEAD - TRACE_TAIL);
                i = len - TRACE_TAIL;
            }
        }
    }
  error:
    TH_POP_TAG();
    rb_thread_raised_set(th, raised_flag);
}

void
ruby_error_print(void)
{
    error_print();
}

void
rb_print_undef(VALUE klass, ID id, int scope)
{
    const char *v;

    switch (scope) {
      default:
      case NOEX_PUBLIC: v = ""; break;
      case NOEX_PRIVATE: v = " private"; break;
      case NOEX_PROTECTED: v = " protected"; break;
    }
    rb_name_error(id, "undefined%s method `%"PRIsVALUE"' for %s `%"PRIsVALUE"'", v,
                  QUOTE_ID(id),
                  (RB_TYPE_P(klass, T_MODULE)) ? "module" : "class",
                  rb_class_name(klass));
}

void
rb_print_undef_str(VALUE klass, VALUE name)
{
    rb_name_error_str(name, "undefined method `%"PRIsVALUE"' for %s `%"PRIsVALUE"'",
                      QUOTE(name),
                      (RB_TYPE_P(klass, T_MODULE)) ? "module" : "class",
                      rb_class_name(klass));
}

static int
sysexit_status(VALUE err)
{
    VALUE st = rb_iv_get(err, "status");
    return NUM2INT(st);
}

static int
error_handle(int ex)
{
    int status = EXIT_FAILURE;
    rb_thread_t *th = GET_THREAD();

    if (rb_threadptr_set_raised(th))
        return EXIT_FAILURE;
    switch (ex & TAG_MASK) {
      case 0:
        status = EXIT_SUCCESS;
        break;

      case TAG_RETURN:
        error_pos();
        warn_print(": unexpected return\n");
        break;
      case TAG_NEXT:
        error_pos();
        warn_print(": unexpected next\n");
        break;
      case TAG_BREAK:
        error_pos();
        warn_print(": unexpected break\n");
        break;
      case TAG_REDO:
        error_pos();
        warn_print(": unexpected redo\n");
        break;
      case TAG_RETRY:
        error_pos();
        warn_print(": retry outside of rescue clause\n");
        break;
      case TAG_THROW:
        /* TODO: fix me */
        error_pos();
        warn_printf(": unexpected throw\n");
        break;
      case TAG_RAISE: {
        VALUE errinfo = GET_THREAD()->errinfo;
        if (rb_obj_is_kind_of(errinfo, rb_eSystemExit)) {
            status = sysexit_status(errinfo);
        }
        else if (rb_obj_is_instance_of(errinfo, rb_eSignal)) {
            /* no message when exiting by signal */
        }
        else {
            error_print();
        }
        break;
      }
      case TAG_FATAL:
        error_print();
        break;
      default:
        rb_bug("Unknown longjmp status %d", ex);
        break;
    }
    rb_threadptr_reset_raised(th);
    return status;
}