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/*
** backtrace.c -
**
** See Copyright Notice in mruby.h
*/
#include <stdarg.h>
#include "mruby.h"
#include "mruby/variable.h"
#include "mruby/proc.h"
#include "mruby/array.h"
#include "mruby/string.h"
#include "mruby/class.h"
#include "mruby/debug.h"
#include "mruby/error.h"
#ifdef ENABLE_STDIO
typedef void (*output_stream_func)(mrb_state*, void*, int, const char*, ...);
static void
print_backtrace_i(mrb_state *mrb, void *stream, int level, const char *format, ...)
{
va_list ap;
va_start(ap, format);
vfprintf((FILE*)stream, format, ap);
va_end(ap);
}
#define MIN_BUFSIZE 127
static void
get_backtrace_i(mrb_state *mrb, void *stream, int level, const char *format, ...)
{
va_list ap;
mrb_value ary, str;
int ai;
if (level > 0) {
return;
}
ai = mrb_gc_arena_save(mrb);
ary = mrb_obj_value((struct RArray*)stream);
va_start(ap, format);
str = mrb_str_new(mrb, 0, vsnprintf(NULL, 0, format, ap) + 1);
va_end(ap);
va_start(ap, format);
vsnprintf(RSTRING_PTR(str), RSTRING_LEN(str), format, ap);
va_end(ap);
mrb_str_resize(mrb, str, RSTRING_LEN(str) - 1);
mrb_ary_push(mrb, ary, str);
mrb_gc_arena_restore(mrb, ai);
}
static void
output_backtrace(mrb_state *mrb, mrb_int ciidx, mrb_code *pc0, output_stream_func func, void *stream)
{
mrb_callinfo *ci;
const char *filename, *method, *sep;
int i, lineno, tracehead = 1;
if (ciidx >= mrb->c->ciend - mrb->c->cibase)
ciidx = 10; /* ciidx is broken... */
for (i = ciidx; i >= 0; i--) {
ci = &mrb->c->cibase[i];
filename = NULL;
if (!ci->proc) continue;
if (MRB_PROC_CFUNC_P(ci->proc)) {
continue;
}
else {
mrb_irep *irep = ci->proc->body.irep;
mrb_code *pc;
if (mrb->c->cibase[i].err) {
pc = mrb->c->cibase[i].err;
}
else if (i+1 <= ciidx) {
pc = mrb->c->cibase[i+1].pc - 1;
}
else {
pc = pc0;
}
filename = mrb_debug_get_filename(irep, (uint32_t)(pc - irep->iseq));
lineno = mrb_debug_get_line(irep, (uint32_t)(pc - irep->iseq));
}
if (lineno == -1) continue;
if (ci->target_class == ci->proc->target_class)
sep = ".";
else
sep = "#";
if (!filename) {
filename = "(unknown)";
}
if (tracehead) {
func(mrb, stream, 1, "trace:\n");
tracehead = 0;
}
method = mrb_sym2name(mrb, ci->mid);
if (method) {
const char *cn = mrb_class_name(mrb, ci->proc->target_class);
if (cn) {
func(mrb, stream, 1, "\t[%d] ", i);
func(mrb, stream, 0, "%s:%d:in %s%s%s", filename, lineno, cn, sep, method);
func(mrb, stream, 1, "\n");
}
else {
func(mrb, stream, 1, "\t[%d] ", i);
func(mrb, stream, 0, "%s:%d:in %s", filename, lineno, method);
func(mrb, stream, 1, "\n");
}
}
else {
func(mrb, stream, 1, "\t[%d] ", i);
func(mrb, stream, 0, "%s:%d", filename, lineno);
func(mrb, stream, 1, "\n");
}
}
}
static void
exc_output_backtrace(mrb_state *mrb, struct RObject *exc, output_stream_func func, void *stream)
{
output_backtrace(mrb, mrb_fixnum(mrb_obj_iv_get(mrb, exc, mrb_intern_lit(mrb, "ciidx"))),
(mrb_code*)mrb_cptr(mrb_obj_iv_get(mrb, exc, mrb_intern_lit(mrb, "lastpc"))),
func, stream);
}
/* mrb_print_backtrace/mrb_get_backtrace:
function to retrieve backtrace information from the exception.
note that if you call method after the exception, call stack will be
overwritten. So invoke these functions just after detecting exceptions.
*/
MRB_API void
mrb_print_backtrace(mrb_state *mrb)
{
if (!mrb->exc || mrb_obj_is_kind_of(mrb, mrb_obj_value(mrb->exc), E_SYSSTACK_ERROR)) {
return;
}
exc_output_backtrace(mrb, mrb->exc, print_backtrace_i, (void*)stderr);
}
MRB_API mrb_value
mrb_exc_backtrace(mrb_state *mrb, mrb_value self)
{
mrb_value ary;
ary = mrb_ary_new(mrb);
exc_output_backtrace(mrb, mrb_obj_ptr(self), get_backtrace_i, (void*)mrb_ary_ptr(ary));
return ary;
}
MRB_API mrb_value
mrb_get_backtrace(mrb_state *mrb)
{
mrb_value ary;
mrb_callinfo *ci = mrb->c->ci;
mrb_code *pc = ci->pc;
mrb_int ciidx = (mrb_int)(ci - mrb->c->cibase - 1);
if (ciidx < 0) ciidx = 0;
ary = mrb_ary_new(mrb);
output_backtrace(mrb, ciidx, pc, get_backtrace_i, (void*)mrb_ary_ptr(ary));
return ary;
}
#else
MRB_API void
mrb_print_backtrace(mrb_state *mrb)
{
}
MRB_API mrb_value
mrb_exc_backtrace(mrb_state *mrb, mrb_value self)
{
return mrb_ary_new(mrb);
}
MRB_API mrb_value
mrb_get_backtrace(mrb_state *mrb)
{
return mrb_ary_new(mrb);
}
#endif
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