do no generate lineno info if no filename is specified

src/codegen.c

@@ -145,10 +145,14 @@ genop(codegen_scope *s, mrb_code i)
   if (s->pc == s->icapa) {
     s->icapa *= 2;
     s->iseq = (mrb_code *)codegen_realloc(s, s->iseq, sizeof(mrb_code)*s->icapa);
-    s->lines = (short*)codegen_realloc(s, s->lines, sizeof(short)*s->icapa);
+    if (s->lines) {
+      s->lines = (short*)codegen_realloc(s, s->lines, sizeof(short)*s->icapa);
+    }
   }
   s->iseq[s->pc] = i;
-  s->lines[s->pc] = s->lineno;
+  if (s->lines) {
+    s->lines[s->pc] = s->lineno;
+  }
   s->pc++;
 }
 
@@ -2040,7 +2044,6 @@ scope_new(mrb_state *mrb, codegen_scope *prev, node *lv)
   p->mrb = prev->mrb;
   p->icapa = 1024;
   p->iseq = (mrb_code*)mrb_malloc(mrb, sizeof(mrb_code)*p->icapa);
-  p->lines = (short*)mrb_malloc(mrb, sizeof(short)*p->icapa);
 
   p->pcapa = 32;
   p->pool = (mrb_value*)mrb_malloc(mrb, sizeof(mrb_value)*p->pcapa);
@@ -2054,7 +2057,9 @@ scope_new(mrb_state *mrb, codegen_scope *prev, node *lv)
 
   p->idx = mrb->irep_len++;
   p->filename = prev->filename;
-
+  if (p->filename) {
+    p->lines = (short*)mrb_malloc(mrb, sizeof(short)*p->icapa);
+  }
   return p;
 }
 
@@ -2074,6 +2079,9 @@ scope_finish(codegen_scope *s, int idx)
     if (s->lines) {
       irep->lines = (short *)codegen_realloc(s, s->lines, sizeof(short)*s->pc);
     }
+    else {
+      irep->lines = 0;
+    }
   }
   if (s->pool) {
     irep->pool = (mrb_value *)codegen_realloc(s, s->pool, sizeof(mrb_value)*s->plen);

src/error.c

@@ -191,7 +191,7 @@ exc_debug_info(mrb_state *mrb, struct RObject *exc)
     if (ci->proc && !MRB_PROC_CFUNC_P(ci->proc)) {
       mrb_irep *irep = ci->proc->body.irep;      
 
-      if (irep->lines && irep->iseq <= pc && pc < irep->iseq + irep->ilen) {
+      if (irep->filename && irep->lines && irep->iseq <= pc && pc < irep->iseq + irep->ilen) {
 	mrb_obj_iv_set(mrb, exc, mrb_intern(mrb, "file"), mrb_str_new_cstr(mrb, irep->filename));
 	mrb_obj_iv_set(mrb, exc, mrb_intern(mrb, "line"), mrb_fixnum_value(irep->lines[pc - irep->iseq - 1]));
 	return;