Add data_file to GCOV interm. format (PR gcov-profile/89961).

2019-04-08  Martin Liska  <mliska@suse.cz>

	PR gcov-profile/89961
	* doc/gcov.texi: Document data_file.
	* gcov.c (generate_results): Add data_info into JSON output.

From-SVN: r270204

gcc/ChangeLog

+2019-04-08  Martin Liska  <mliska@suse.cz>
+
+	PR gcov-profile/89961
+	* doc/gcov.texi: Document data_file.
+	* gcov.c (generate_results): Add data_info into JSON output.
+
 2019-04-01  Bin Cheng  <bin.cheng@linux.alibaba.com>
 
 	PR tree-optimization/89725

gcc/doc/gcov.texi

@@ -192,6 +192,7 @@ Structure of the JSON is following:
 @smallexample
 @{
   "current_working_directory": @var{current_working_directory},
+  "data_file": @var{data_file},
   "format_version": @var{format_version},
   "gcc_version": @var{gcc_version}
   "files": [@var{file}]
@@ -206,6 +207,9 @@ Fields of the root element have following semantics:
 a compilation unit was compiled
 
 @item
+@var{data_file}: name of the data file (GCDA)
+
+@item
 @var{format_version}: semantic version of the format
 
 @item

gcc/gcov.c

@@ -1421,6 +1421,7 @@ generate_results (const char *file_name)
 
   if (bbg_cwd != NULL)
     root->set ("current_working_directory", new json::string (bbg_cwd));
+  root->set ("data_file", new json::string (file_name));
 
   json::array *json_files = new json::array ();
   root->set ("files", json_files);