From d6683f89123f4badb0396d5c9adcc81f46494b0b Mon Sep 17 00:00:00 2001 From: Martin Liska Date: Mon, 17 Sep 2018 10:49:09 +0200 Subject: gcov: emit hotness colors to easily find hot code. 2018-09-17 Martin Liska * doc/gcov.texi: Document new option --use-hotness-colors. * gcov.c (struct source_info): Declare new field. (source_info::source_info): Set default for maximum_count. (print_usage): Add new -q option. (process_args): Process it. (accumulate_line_info): Save src->maximum_count. (output_line_beginning): Make color line number if flag_use_hotness_colors is set. (output_line_details): Pass default argument value. (output_lines): Pass src->maximum_count. From-SVN: r264360 --- gcc/gcov.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 49 insertions(+), 7 deletions(-) (limited to 'gcc/gcov.c') diff --git a/gcc/gcov.c b/gcc/gcov.c index 6a24a32..64ab85c 100644 --- a/gcc/gcov.c +++ b/gcc/gcov.c @@ -339,13 +339,16 @@ struct source_info coverage_info coverage; + /* Maximum line count in the source file. */ + unsigned int maximum_count; + /* Functions in this source file. These are in ascending line number order. */ vector functions; }; source_info::source_info (): index (0), name (NULL), file_time (), - lines (), coverage (), functions () + lines (), coverage (), maximum_count (0), functions () { } @@ -502,6 +505,10 @@ static int flag_verbose = 0; static int flag_use_colors = 0; +/* Use perf-like colors to indicate hot lines. */ + +static int flag_use_hotness_colors = 0; + /* Output count information for every basic block, not merely those that contain line number information. */ @@ -839,6 +846,7 @@ print_usage (int error_p) fnotice (file, " -n, --no-output Do not create an output file\n"); fnotice (file, " -o, --object-directory DIR|FILE Search for object files in DIR or called FILE\n"); fnotice (file, " -p, --preserve-paths Preserve all pathname components\n"); + fnotice (file, " -q, --use-hotness-colors Emit perf-like colored output for hot lines\n"); fnotice (file, " -r, --relative-only Only show data for relative sources\n"); fnotice (file, " -s, --source-prefix DIR Source prefix to elide\n"); fnotice (file, " -t, --stdout Output to stdout instead of a file\n"); @@ -890,6 +898,7 @@ static const struct option options[] = { "display-progress", no_argument, NULL, 'd' }, { "hash-filenames", no_argument, NULL, 'x' }, { "use-colors", no_argument, NULL, 'k' }, + { "use-hotness-colors", no_argument, NULL, 'q' }, { 0, 0, 0, 0 } }; @@ -900,7 +909,7 @@ process_args (int argc, char **argv) { int opt; - const char *opts = "abcdfhijklmno:prs:tuvwx"; + const char *opts = "abcdfhijklmno:pqrs:tuvwx"; while ((opt = getopt_long (argc, argv, opts, options, NULL)) != -1) { switch (opt) @@ -929,6 +938,9 @@ process_args (int argc, char **argv) case 'k': flag_use_colors = 1; break; + case 'q': + flag_use_hotness_colors = 1; + break; case 'm': flag_demangled_names = 1; break; @@ -2580,6 +2592,9 @@ static void accumulate_line_info (line_info *line, source_info *src, /* Now, add the count of loops entirely on this line. */ count += get_cycles_count (*line); line->count = count; + + if (line->count > src->maximum_count) + src->maximum_count = line->count; } if (line->exists && add_coverage) @@ -2756,7 +2771,8 @@ output_line_beginning (FILE *f, bool exists, bool unexceptional, bool has_unexecuted_block, gcov_type count, unsigned line_num, const char *exceptional_string, - const char *unexceptional_string) + const char *unexceptional_string, + unsigned int maximum_count) { string s; if (exists) @@ -2806,7 +2822,23 @@ output_line_beginning (FILE *f, bool exists, bool unexceptional, pad_count_string (s); } - fprintf (f, "%s:%5u", s.c_str (), line_num); + /* Format line number in output. */ + char buffer[16]; + sprintf (buffer, "%5u", line_num); + string linestr (buffer); + + if (flag_use_hotness_colors && maximum_count) + { + if (count * 2 > maximum_count) /* > 50%. */ + linestr.insert (0, SGR_SEQ (COLOR_BG_RED)); + else if (count * 5 > maximum_count) /* > 20%. */ + linestr.insert (0, SGR_SEQ (COLOR_BG_YELLOW)); + else if (count * 10 > maximum_count) /* > 10%. */ + linestr.insert (0, SGR_SEQ (COLOR_BG_GREEN)); + linestr += SGR_RESET; + } + + fprintf (f, "%s:%s", s.c_str (), linestr.c_str ()); } static void @@ -2839,7 +2871,7 @@ output_line_details (FILE *f, const line_info *line, unsigned line_num) output_line_beginning (f, line->exists, (*it)->exceptional, false, (*it)->count, line_num, - "%%%%%", "$$$$$"); + "%%%%%", "$$$$$", 0); fprintf (f, "-block %2d", ix++); if (flag_verbose) fprintf (f, " (BB %u)", (*it)->id); @@ -2902,6 +2934,15 @@ output_lines (FILE *gcov_file, const source_info *src) FILE *source_file; const char *retval; + /* Print legend of color hotness syntax. */ + if (flag_use_hotness_colors) + fprintf (gcov_file, "%s", DEFAULT_LINE_START "Hotness legend: " \ + SGR_SEQ (COLOR_BG_RED) "> 50%" SGR_RESET " " \ + SGR_SEQ (COLOR_BG_YELLOW) "> 20%" SGR_RESET " " \ + SGR_SEQ (COLOR_BG_GREEN) "> 10%" SGR_RESET "\n"); + + fprintf (gcov_file, DEFAULT_LINE_START "Source:%s\n", src->coverage.name); + fprintf (gcov_file, DEFAULT_LINE_START "Source:%s\n", src->coverage.name); if (!multiple_files) { @@ -2964,7 +3005,7 @@ output_lines (FILE *gcov_file, const source_info *src) line so that tabs won't be messed up. */ output_line_beginning (gcov_file, line->exists, line->unexceptional, line->has_unexecuted_block, line->count, - line_num, "=====", "#####"); + line_num, "=====", "#####", src->maximum_count); print_source_line (gcov_file, source_lines, line_num); output_line_details (gcov_file, line, line_num); @@ -3009,7 +3050,8 @@ output_lines (FILE *gcov_file, const source_info *src) line->unexceptional, line->has_unexecuted_block, line->count, - l, "=====", "#####"); + l, "=====", "#####", + src->maximum_count); print_source_line (gcov_file, source_lines, l); output_line_details (gcov_file, line, l); -- cgit v1.1