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tag: v1_9_2_preview3
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/* -*-c-*- */
/*
* included by eval.c
*/

static void
warn_printf(const char *fmt, ...)
{
    char buf[BUFSIZ];
    va_list args;

    va_init_list(args, fmt);
    vsnprintf(buf, BUFSIZ, fmt, args);
    va_end(args);
    rb_write_error(buf);
}

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

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);
}
    }
}

VALUE rb_check_backtrace(VALUE);

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);
}

static void
set_backtrace(VALUE info, VALUE bt)
{
    rb_funcall(info, rb_intern("set_backtrace"), 1, bt);
}

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

    if (NIL_P(errinfo))
return;

    PUSH_TAG();
    if (EXEC_TAG() == 0) {
errat = get_backtrace(errinfo);
    }
    else {
errat = Qnil;
    }
    if (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_print2(RSTRING_PTR(mesg), RSTRING_LEN(mesg));
}
    }

    eclass = CLASS_OF(errinfo);
    if (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 (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_print2(RSTRING_PTR(epath), RSTRING_LEN(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_print2(RSTRING_PTR(epath), RSTRING_LEN(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 (TYPE(ptr[i]) == T_STRING) {
warn_printf("\tfrom %s\n", RSTRING_PTR(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:
    POP_TAG();
}

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 `%s' for %s `%s'", v,
rb_id2name(id),
(TYPE(klass) == T_MODULE) ? "module" : "class",
rb_class2name(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;
}
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