4 ** See Copyright Notice in mruby.h
8 #include <mruby/variable.h>
9 #include <mruby/proc.h>
10 #include <mruby/array.h>
11 #include <mruby/string.h>
12 #include <mruby/class.h>
13 #include <mruby/debug.h>
14 #include <mruby/error.h>
15 #include <mruby/numeric.h>
16 #include <mruby/data.h>
18 struct backtrace_location {
24 typedef void (*each_backtrace_func)(mrb_state*, const struct backtrace_location*, void*);
26 static const mrb_data_type bt_type = { "Backtrace", mrb_free };
29 each_backtrace(mrb_state *mrb, ptrdiff_t ciidx, mrb_code *pc0, each_backtrace_func func, void *data)
33 if (ciidx >= mrb->c->ciend - mrb->c->cibase)
34 ciidx = 10; /* ciidx is broken... */
36 for (i=ciidx; i >= 0; i--) {
37 struct backtrace_location loc;
42 ci = &mrb->c->cibase[i];
44 if (!ci->proc) continue;
45 if (MRB_PROC_CFUNC_P(ci->proc)) continue;
47 irep = ci->proc->body.irep;
50 if (mrb->c->cibase[i].err) {
51 pc = mrb->c->cibase[i].err;
53 else if (i+1 <= ciidx) {
54 if (!mrb->c->cibase[i + 1].pc) continue;
55 pc = &mrb->c->cibase[i+1].pc[-1];
61 loc.lineno = mrb_debug_get_line(mrb, irep, pc - irep->iseq);
62 if (loc.lineno == -1) continue;
64 loc.filename = mrb_debug_get_filename(mrb, irep, pc - irep->iseq);
66 loc.filename = "(unknown)";
69 loc.method_id = ci->mid;
70 func(mrb, &loc, data);
74 #ifndef MRB_DISABLE_STDIO
77 print_backtrace(mrb_state *mrb, mrb_value backtrace)
81 FILE *stream = stderr;
83 n = RARRAY_LEN(backtrace) - 1;
86 fprintf(stream, "trace (most recent call last):\n");
88 mrb_value entry = RARRAY_PTR(backtrace)[n-i-1];
90 if (mrb_string_p(entry)) {
91 fprintf(stream, "\t[%d] %.*s\n", i, (int)RSTRING_LEN(entry), RSTRING_PTR(entry));
97 packed_bt_len(const struct backtrace_location *bt, int n)
102 for (i=0; i<n; i++) {
103 if (!bt[i].filename && !bt[i].lineno && !bt[i].method_id)
111 print_packed_backtrace(mrb_state *mrb, mrb_value packed)
113 FILE *stream = stderr;
114 const struct backtrace_location *bt;
116 int ai = mrb_gc_arena_save(mrb);
118 bt = (struct backtrace_location*)mrb_data_check_get_ptr(mrb, packed, &bt_type);
119 if (bt == NULL) return;
120 n = (mrb_int)RDATA(packed)->flags;
122 if (packed_bt_len(bt, n) == 0) return;
123 fprintf(stream, "trace (most recent call last):\n");
124 for (i = 0; i<n; i++) {
125 const struct backtrace_location *entry = &bt[n-i-1];
126 if (entry->filename == NULL) continue;
127 fprintf(stream, "\t[%d] %s:%d", i, entry->filename, entry->lineno);
128 if (entry->method_id != 0) {
129 const char *method_name;
131 method_name = mrb_sym2name(mrb, entry->method_id);
132 fprintf(stream, ":in %s", method_name);
133 mrb_gc_arena_restore(mrb, ai);
135 fprintf(stream, "\n");
139 /* mrb_print_backtrace
141 function to retrieve backtrace information from the last exception.
145 mrb_print_backtrace(mrb_state *mrb)
153 backtrace = mrb_obj_iv_get(mrb, mrb->exc, mrb_intern_lit(mrb, "backtrace"));
154 if (mrb_nil_p(backtrace)) return;
155 if (mrb_array_p(backtrace)) {
156 print_backtrace(mrb, backtrace);
159 print_packed_backtrace(mrb, backtrace);
165 mrb_print_backtrace(mrb_state *mrb)
172 count_backtrace_i(mrb_state *mrb,
173 const struct backtrace_location *loc,
176 int *lenp = (int*)data;
178 if (loc->filename == NULL) return;
183 pack_backtrace_i(mrb_state *mrb,
184 const struct backtrace_location *loc,
187 struct backtrace_location **pptr = (struct backtrace_location**)data;
188 struct backtrace_location *ptr = *pptr;
190 if (loc->filename == NULL) return;
196 packed_backtrace(mrb_state *mrb)
198 struct RData *backtrace;
199 ptrdiff_t ciidx = mrb->c->ci - mrb->c->cibase;
204 each_backtrace(mrb, ciidx, mrb->c->ci->pc, count_backtrace_i, &len);
205 size = len * sizeof(struct backtrace_location);
206 ptr = mrb_malloc(mrb, size);
207 backtrace = mrb_data_object_alloc(mrb, NULL, ptr, &bt_type);
208 backtrace->flags = (unsigned int)len;
209 each_backtrace(mrb, ciidx, mrb->c->ci->pc, pack_backtrace_i, &ptr);
210 return mrb_obj_value(backtrace);
214 mrb_keep_backtrace(mrb_state *mrb, mrb_value exc)
216 mrb_sym sym = mrb_intern_lit(mrb, "backtrace");
220 if (mrb_iv_defined(mrb, exc, sym)) return;
221 ai = mrb_gc_arena_save(mrb);
222 backtrace = packed_backtrace(mrb);
223 mrb_iv_set(mrb, exc, sym, backtrace);
224 mrb_gc_arena_restore(mrb, ai);
228 mrb_unpack_backtrace(mrb_state *mrb, mrb_value backtrace)
230 const struct backtrace_location *bt;
234 if (mrb_nil_p(backtrace)) {
236 return mrb_ary_new_capa(mrb, 0);
238 if (mrb_array_p(backtrace)) return backtrace;
239 bt = (struct backtrace_location*)mrb_data_check_get_ptr(mrb, backtrace, &bt_type);
240 if (bt == NULL) goto empty_backtrace;
241 n = (mrb_int)RDATA(backtrace)->flags;
242 backtrace = mrb_ary_new_capa(mrb, n);
243 ai = mrb_gc_arena_save(mrb);
244 for (i = 0; i < n; i++) {
245 const struct backtrace_location *entry = &bt[i];
248 if (entry->filename == NULL) continue;
249 btline = mrb_format(mrb, "%S:%S",
250 mrb_str_new_cstr(mrb, entry->filename),
251 mrb_fixnum_value(entry->lineno));
252 if (entry->method_id != 0) {
253 mrb_str_cat_lit(mrb, btline, ":in ");
254 mrb_str_cat_cstr(mrb, btline, mrb_sym2name(mrb, entry->method_id));
256 mrb_ary_push(mrb, backtrace, btline);
257 mrb_gc_arena_restore(mrb, ai);
264 mrb_exc_backtrace(mrb_state *mrb, mrb_value exc)
269 attr_name = mrb_intern_lit(mrb, "backtrace");
270 backtrace = mrb_iv_get(mrb, exc, attr_name);
271 if (mrb_nil_p(backtrace) || mrb_array_p(backtrace)) {
274 backtrace = mrb_unpack_backtrace(mrb, backtrace);
275 mrb_iv_set(mrb, exc, attr_name, backtrace);
280 mrb_get_backtrace(mrb_state *mrb)
282 return mrb_unpack_backtrace(mrb, packed_backtrace(mrb));