Replace <top> label by the required file path

ext/stackprof/stackprof.c

@@ -224,6 +224,18 @@ frame_lines_i(st_data_t key, st_data_t val, st_data_t arg)
     return ST_CONTINUE;
 }
 
+static VALUE
+coerce_frame_name(VALUE name, VALUE line)
+{
+    char *start_pointer = strstr(RSTRING_PTR(name), "<top (required)>\0");
+    if (start_pointer) {
+    	VALUE new_name = rb_str_new(RSTRING_PTR(name), start_pointer - RSTRING_PTR(name));
+    	rb_str_cat_cstr(new_name, RSTRING_PTR(line));
+    	return new_name;
+    }
+    return name;
+}
+
 static int
 frame_i(st_data_t key, st_data_t val, st_data_t arg)
 {
@@ -242,13 +254,15 @@ frame_i(st_data_t key, st_data_t val, st_data_t arg)
 	line = INT2FIX(0);
     } else {
 	name = rb_profile_frame_full_label(frame);
-
 	file = rb_profile_frame_absolute_path(frame);
 	if (NIL_P(file))
 	    file = rb_profile_frame_path(frame);
 	line = rb_profile_frame_first_lineno(frame);
     }
 
+
+    name = coerce_frame_name(name, file);
+
     rb_hash_aset(details, sym_name, name);
     rb_hash_aset(details, sym_file, file);
     if (line != INT2FIX(0)) {

test/test_stackprof.rb

@@ -194,6 +194,18 @@ def test_gc
     assert_operator profile[:missed_samples], :<=, 25
   end
 
+  def test_top_required
+    tmpfile = Tempfile.new(%w(stackprof-script .rb))
+    tmpfile.write("10.times { sleep 0.1 }\n")
+    tmpfile.flush
+    path = File.realpath(tmpfile.path)
+    ret = StackProf.run(interval: 10) do
+      require path
+    end
+    frame_names = ret[:frames].values.select { |f| f[:file] == path }.map { |f| f[:name] }
+    assert_equal ["block in #{path}", path], frame_names
+  end
+
   def test_out
     tmpfile = Tempfile.new('stackprof-out')
     ret = StackProf.run(mode: :custom, out: tmpfile) do