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ruby/eval_error.c

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/* -*-c-*- */
/*
* included by eval.c
*/
#define write_warn(str, x) \
(NIL_P(str) ? warn_print(x) : (void)rb_str_cat_cstr(str, x))
#define write_warn2(str, x, l) \
(NIL_P(str) ? warn_print2(x, l) : (void)rb_str_cat(str, x, l))
#ifdef HAVE_BUILTIN___BUILTIN_CONSTANT_P
#define warn_print(x) RB_GNUC_EXTENSION_BLOCK( \
(__builtin_constant_p(x)) ? \
rb_write_error2((x), (long)strlen(x)) : \
rb_write_error(x) \
)
#else
#define warn_print(x) rb_write_error(x)
#endif
#define warn_print2(x,l) rb_write_error2((x),(l))
#define write_warn_str(str,x) NIL_P(str) ? rb_write_error_str(x) : (void)rb_str_concat((str), (x))
#define warn_print_str(x) rb_write_error_str(x)
static VALUE error_pos_str(void);
static void
error_pos(const VALUE str)
{
VALUE pos = error_pos_str();
if (!NIL_P(pos)) {
write_warn_str(str, pos);
}
}
static VALUE
error_pos_str(void)
{
int sourceline;
VALUE sourcefile = rb_source_location(&sourceline);
if (!NIL_P(sourcefile)) {
ID caller_name;
if (sourceline == 0) {
return rb_sprintf("%"PRIsVALUE": ", sourcefile);
}
else if ((caller_name = rb_frame_callee()) != 0) {
return rb_sprintf("%"PRIsVALUE":%d:in `%"PRIsVALUE"': ",
sourcefile, sourceline,
rb_id2str(caller_name));
}
else {
return rb_sprintf("%"PRIsVALUE":%d: ", sourcefile, sourceline);
}
}
return Qnil;
}
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_check_funcall(info, set_backtrace, 1, &bt);
}
static void
error_print(rb_execution_context_t *ec)
{
rb_ec_error_print(ec, ec->errinfo);
}
static void
write_warnq(VALUE out, VALUE str, const char *ptr, long len)
{
if (NIL_P(out)) {
const char *beg = ptr;
const long olen = len;
for (; len > 0; --len, ++ptr) {
unsigned char c = *ptr;
switch (c) {
case '\n': case '\t': continue;
}
if (rb_iscntrl(c)) {
char buf[5];
const char *cc = 0;
if (ptr > beg) rb_write_error2(beg, ptr - beg);
beg = ptr + 1;
cc = ruby_escaped_char(c);
if (cc) {
rb_write_error2(cc, strlen(cc));
}
else {
rb_write_error2(buf, snprintf(buf, sizeof(buf), "\\x%02X", c));
}
}
else if (c == '\\') {
rb_write_error2(beg, ptr - beg + 1);
beg = ptr;
}
}
if (ptr > beg) {
if (beg == RSTRING_PTR(str) && olen == RSTRING_LEN(str))
rb_write_error_str(str);
else
rb_write_error2(beg, ptr - beg);
}
}
else {
rb_str_cat(out, ptr, len);
}
}
#define CSI_BEGIN "\033["
#define CSI_SGR "m"
static const char underline[] = CSI_BEGIN"1;4"CSI_SGR;
static const char bold[] = CSI_BEGIN"1"CSI_SGR;
static const char reset[] = CSI_BEGIN""CSI_SGR;
static void
print_errinfo(const VALUE eclass, const VALUE errat, const VALUE emesg, const VALUE str, int highlight)
{
const char *einfo = "";
long elen = 0;
VALUE mesg;
if (emesg != Qundef) {
if (NIL_P(errat) || RARRAY_LEN(errat) == 0 ||
NIL_P(mesg = RARRAY_AREF(errat, 0))) {
error_pos(str);
}
else {
write_warn_str(str, mesg);
write_warn(str, ": ");
}
if (!NIL_P(emesg)) {
einfo = RSTRING_PTR(emesg);
elen = RSTRING_LEN(emesg);
}
}
if (eclass == rb_eRuntimeError && elen == 0) {
if (highlight) write_warn(str, underline);
write_warn(str, "unhandled exception");
if (highlight) write_warn(str, reset);
write_warn2(str, "\n", 1);
}
else {
VALUE epath;
epath = rb_class_name(eclass);
if (elen == 0) {
if (highlight) write_warn(str, underline);
write_warn_str(str, epath);
if (highlight) write_warn(str, reset);
write_warn(str, "\n");
}
else {
/* emesg is a String instance */
const char *tail = 0;
if (highlight) write_warn(str, bold);
if (RSTRING_PTR(epath)[0] == '#')
epath = 0;
if ((tail = memchr(einfo, '\n', elen)) != 0) {
write_warnq(str, emesg, einfo, tail - einfo);
tail++; /* skip newline */
}
else {
write_warnq(str, emesg, einfo, elen);
}
if (epath) {
write_warn(str, " (");
if (highlight) write_warn(str, underline);
write_warn_str(str, epath);
if (highlight) {
write_warn(str, reset);
write_warn(str, bold);
}
write_warn2(str, ")", 1);
if (highlight) write_warn(str, reset);
write_warn2(str, "\n", 1);
}
if (tail && einfo+elen > tail) {
if (!highlight) {
write_warnq(str, emesg, tail, einfo+elen-tail);
if (einfo[elen-1] != '\n') write_warn2(str, "\n", 1);
}
else {
elen -= tail - einfo;
einfo = tail;
while (elen > 0) {
tail = memchr(einfo, '\n', elen);
if (!tail || tail > einfo) {
write_warn(str, bold);
write_warnq(str, emesg, einfo, tail ? tail-einfo : elen);
write_warn(str, reset);
if (!tail) {
write_warn2(str, "\n", 1);
break;
}
}
elen -= tail - einfo;
einfo = tail;
do ++tail; while (tail < einfo+elen && *tail == '\n');
write_warnq(str, emesg, einfo, tail-einfo);
elen -= tail - einfo;
einfo = tail;
}
}
}
else if (!epath) {
write_warn2(str, "\n", 1);
}
}
}
}
static void
print_backtrace(const VALUE eclass, const VALUE errat, const VALUE str, int reverse)
{
if (!NIL_P(errat)) {
long i;
long len = RARRAY_LEN(errat);
const int threshold = 1000000000;
int width = (len <= 1) ? INT_MIN : ((int)log10((double)(len > threshold ?
((len - 1) / threshold) :
len - 1)) +
(len < threshold ? 0 : 9) + 1);
long skip_start = -1, skip_len = 0;
// skip for stackoverflow
if (eclass == rb_eSysStackError) {
long trace_head = 9;
long trace_tail = 4;
long trace_max = trace_head + trace_tail + 5;
if (len > trace_max) {
skip_start = trace_head;
skip_len = len - trace_max + 5;
}
}
// skip for explicit limit
if (rb_backtrace_length_limit >= 0 && len > rb_backtrace_length_limit + 1) {
skip_start = rb_backtrace_length_limit + 1;
skip_len = len - rb_backtrace_length_limit;
}
for (i = 1; i < len; i++) {
if (i == skip_start) {
write_warn_str(str, rb_sprintf("\t ... %ld levels...\n", skip_len));
i += skip_len;
if (i >= len) break;
}
VALUE line = RARRAY_AREF(errat, reverse ? len - i : i);
if (RB_TYPE_P(line, T_STRING)) {
VALUE bt = rb_str_new_cstr("\t");
if (reverse) rb_str_catf(bt, "%*ld: ", width, len - i);
write_warn_str(str, rb_str_catf(bt, "from %"PRIsVALUE"\n", line));
}
}
}
}
VALUE rb_get_message(VALUE exc);
static int
shown_cause_p(VALUE cause, VALUE *shown_causes)
{
VALUE shown = *shown_causes;
if (!shown) {
*shown_causes = shown = rb_obj_hide(rb_ident_hash_new());
}
if (rb_hash_has_key(shown, cause)) return TRUE;
rb_hash_aset(shown, cause, Qtrue);
return FALSE;
}
static void
show_cause(VALUE errinfo, VALUE str, VALUE highlight, VALUE reverse, VALUE *shown_causes)
{
VALUE cause = rb_attr_get(errinfo, id_cause);
if (!NIL_P(cause) && rb_obj_is_kind_of(cause, rb_eException) &&
!shown_cause_p(cause, shown_causes)) {
volatile VALUE eclass = CLASS_OF(cause);
VALUE errat = rb_get_backtrace(cause);
VALUE emesg = rb_get_message(cause);
if (reverse) {
show_cause(cause, str, highlight, reverse, shown_causes);
print_backtrace(eclass, errat, str, TRUE);
print_errinfo(eclass, errat, emesg, str, highlight!=0);
}
else {
print_errinfo(eclass, errat, emesg, str, highlight!=0);
print_backtrace(eclass, errat, str, FALSE);
show_cause(cause, str, highlight, reverse, shown_causes);
}
}
}
void
rb_error_write(VALUE errinfo, VALUE emesg, VALUE errat, VALUE str, VALUE highlight, VALUE reverse)
{
volatile VALUE eclass;
VALUE shown_causes = 0;
if (NIL_P(errinfo))
return;
if (errat == Qundef) {
errat = Qnil;
}
eclass = CLASS_OF(errinfo);
if (NIL_P(reverse)) reverse = Qfalse;
if (NIL_P(highlight)) {
VALUE tty = (VALUE)rb_stderr_tty_p();
if (NIL_P(highlight)) highlight = tty;
}
if (reverse) {
static const char traceback[] = "Traceback "
"(most recent call last):\n";
const int bold_part = rb_strlen_lit("Traceback");
char buff[sizeof(traceback)+sizeof(bold)+sizeof(reset)-2], *p = buff;
const char *msg = traceback;
long len = sizeof(traceback) - 1;
if (highlight) {
#define APPEND(s, l) (memcpy(p, s, l), p += (l))
APPEND(bold, sizeof(bold)-1);
APPEND(traceback, bold_part);
APPEND(reset, sizeof(reset)-1);
APPEND(traceback + bold_part, sizeof(traceback)-bold_part-1);
#undef APPEND
len = p - (msg = buff);
}
write_warn2(str, msg, len);
show_cause(errinfo, str, highlight, reverse, &shown_causes);
print_backtrace(eclass, errat, str, TRUE);
print_errinfo(eclass, errat, emesg, str, highlight!=0);
}
else {
print_errinfo(eclass, errat, emesg, str, highlight!=0);
print_backtrace(eclass, errat, str, FALSE);
show_cause(errinfo, str, highlight, reverse, &shown_causes);
}
}
void
rb_ec_error_print(rb_execution_context_t * volatile ec, volatile VALUE errinfo)
{
volatile uint8_t raised_flag = ec->raised_flag;
volatile VALUE errat = Qundef;
volatile VALUE emesg = Qundef;
volatile bool written = false;
if (NIL_P(errinfo))
return;
rb_ec_raised_clear(ec);
EC_PUSH_TAG(ec);
if (EC_EXEC_TAG() == TAG_NONE) {
errat = rb_get_backtrace(errinfo);
}
if (emesg == Qundef) {
emesg = Qnil;
emesg = rb_get_message(errinfo);
}
if (!written) {
written = true;
rb_error_write(errinfo, emesg, errat, Qnil, Qnil, Qfalse);
}
EC_POP_TAG();
ec->errinfo = errinfo;
rb_ec_raised_set(ec, raised_flag);
}
#define undef_mesg_for(v, k) rb_fstring_lit("undefined"v" method `%1$s' for "k" `%2$s'")
#define undef_mesg(v) ( \
is_mod ? \
undef_mesg_for(v, "module") : \
undef_mesg_for(v, "class"))
void
rb_print_undef(VALUE klass, ID id, rb_method_visibility_t visi)
{
const int is_mod = RB_TYPE_P(klass, T_MODULE);
VALUE mesg;
switch (visi & METHOD_VISI_MASK) {
case METHOD_VISI_UNDEF:
case METHOD_VISI_PUBLIC: mesg = undef_mesg(""); break;
case METHOD_VISI_PRIVATE: mesg = undef_mesg(" private"); break;
case METHOD_VISI_PROTECTED: mesg = undef_mesg(" protected"); break;
default: UNREACHABLE;
}
rb_name_err_raise_str(mesg, klass, ID2SYM(id));
}
void
rb_print_undef_str(VALUE klass, VALUE name)
{
const int is_mod = RB_TYPE_P(klass, T_MODULE);
rb_name_err_raise_str(undef_mesg(""), klass, name);
}
#define inaccessible_mesg_for(v, k) rb_fstring_lit("method `%1$s' for "k" `%2$s' is "v)
#define inaccessible_mesg(v) ( \
is_mod ? \
inaccessible_mesg_for(v, "module") : \
inaccessible_mesg_for(v, "class"))
void
rb_print_inaccessible(VALUE klass, ID id, rb_method_visibility_t visi)
{
const int is_mod = RB_TYPE_P(klass, T_MODULE);
VALUE mesg;
switch (visi & METHOD_VISI_MASK) {
case METHOD_VISI_UNDEF:
case METHOD_VISI_PUBLIC: mesg = inaccessible_mesg(""); break;
case METHOD_VISI_PRIVATE: mesg = inaccessible_mesg(" private"); break;
case METHOD_VISI_PROTECTED: mesg = inaccessible_mesg(" protected"); break;
default: UNREACHABLE;
}
rb_name_err_raise_str(mesg, klass, ID2SYM(id));
}
static int
sysexit_status(VALUE err)
{
VALUE st = rb_ivar_get(err, id_status);
return NUM2INT(st);
}
#define unknown_longjmp_status(status) \
rb_bug("Unknown longjmp status %d", status)
static int
error_handle(rb_execution_context_t *ec, int ex)
{
int status = EXIT_FAILURE;
if (rb_ec_set_raised(ec))
return EXIT_FAILURE;
switch (ex & TAG_MASK) {
case 0:
status = EXIT_SUCCESS;
break;
case TAG_RETURN:
error_pos(Qnil);
warn_print("unexpected return\n");
break;
case TAG_NEXT:
error_pos(Qnil);
warn_print("unexpected next\n");
break;
case TAG_BREAK:
error_pos(Qnil);
warn_print("unexpected break\n");
break;
case TAG_REDO:
error_pos(Qnil);
warn_print("unexpected redo\n");
break;
case TAG_RETRY:
error_pos(Qnil);
warn_print("retry outside of rescue clause\n");
break;
case TAG_THROW:
/* TODO: fix me */
error_pos(Qnil);
warn_print("unexpected throw\n");
break;
case TAG_RAISE: {
VALUE errinfo = ec->errinfo;
if (rb_obj_is_kind_of(errinfo, rb_eSystemExit)) {
status = sysexit_status(errinfo);
}
else if (rb_obj_is_instance_of(errinfo, rb_eSignal) &&
rb_ivar_get(errinfo, id_signo) != INT2FIX(SIGSEGV)) {
/* no message when exiting by signal */
}
else if (rb_obj_is_kind_of(errinfo, rb_eSystemCallError) &&
FIXNUM_P(rb_attr_get(errinfo, id_signo))) {
/* no message when exiting by error to be mapped to signal */
}
else {
rb_ec_error_print(ec, errinfo);
}
break;
}
case TAG_FATAL:
error_print(ec);
break;
default:
unknown_longjmp_status(ex);
break;
}
rb_ec_reset_raised(ec);
return status;
}
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