perf hists: Add support for header span

Add span argument for header callback function.

The handling of this argument is completely in the hands of the
callback. The only thing the caller ensures is it's zeroed on the
beginning.

Omitting span skipping in hierarchy headers and gtk code.

The c2c code use this to span header lines based on the entries span
configuration.

Signed-off-by: Jiri Olsa <[e-mail]>
Cc: David Ahern <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/builtin-diff.c

···
 
 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
 		       struct hists *hists __maybe_unused,
-		       int line __maybe_unused)
+		       int line __maybe_unused,
+		       int *span __maybe_unused)
 {
 	struct diff_hpp_fmt *dfmt =
 		container_of(fmt, struct diff_hpp_fmt, fmt);

tools/perf/ui/browsers/hists.c

···
 	struct perf_hpp_fmt *fmt;
 	size_t ret = 0;
 	int column = 0;
+	int span = 0;
 
 	if (symbol_conf.use_callchain) {
 		ret = scnprintf(buf, size, "  ");
···
 		if (perf_hpp__should_skip(fmt, hists)  || column++ < browser->b.horiz_scroll)
 			continue;
 
-		ret = fmt->header(fmt, &dummy_hpp, hists, line);
+		ret = fmt->header(fmt, &dummy_hpp, hists, line, &span);
 		if (advance_hpp_check(&dummy_hpp, ret))
 			break;
+
+		if (span)
+			continue;
 
 		ret = scnprintf(dummy_hpp.buf, dummy_hpp.size, "  ");
 		if (advance_hpp_check(&dummy_hpp, ret))
···
 		if (column++ < browser->b.horiz_scroll)
 			continue;
 
-		ret = fmt->header(fmt, &dummy_hpp, hists, 0);
+		ret = fmt->header(fmt, &dummy_hpp, hists, 0, NULL);
 		if (advance_hpp_check(&dummy_hpp, ret))
 			break;
 
···
 			}
 			first_col = false;
 
-			ret = fmt->header(fmt, &dummy_hpp, hists, 0);
+			ret = fmt->header(fmt, &dummy_hpp, hists, 0, NULL);
 			dummy_hpp.buf[ret] = '\0';
 
 			start = trim(dummy_hpp.buf);

tools/perf/ui/gtk/hists.c

···
 				strcat(buf, "+");
 			first_col = false;
 
-			fmt->header(fmt, &hpp, hists, 0);
+			fmt->header(fmt, &hpp, hists, 0, NULL);
 			strcat(buf, ltrim(rtrim(hpp.buf)));
 		}
 	}

tools/perf/ui/hist.c

···
 }
 
 static int hpp__header_fn(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
-			  struct hists *hists, int line __maybe_unused)
+			  struct hists *hists, int line __maybe_unused,
+			  int *span __maybe_unused)
 {
 	int len = hpp__width_fn(fmt, hpp, hists);
 	return scnprintf(hpp->buf, hpp->size, "%*s", len, fmt->name);

tools/perf/ui/stdio/hist.c

···
 				    struct perf_hpp_list_node, list);
 
 	perf_hpp_list__for_each_format(&fmt_node->hpp, fmt) {
-		fmt->header(fmt, hpp, hists, 0);
+		fmt->header(fmt, hpp, hists, 0, NULL);
 		fprintf(fp, "%s%s", hpp->buf, sep ?: "  ");
 	}
 
···
 				header_width += fprintf(fp, "+");
 			first_col = false;
 
-			fmt->header(fmt, hpp, hists, 0);
+			fmt->header(fmt, hpp, hists, 0, NULL);
 
 			header_width += fprintf(fp, "%s", trim(hpp->buf));
 		}
···
 	struct perf_hpp_fmt *fmt;
 	const char *sep = symbol_conf.field_sep;
 	bool first = true;
+	int span = 0;
 
 	hists__for_each_format(hists, fmt) {
 		if (perf_hpp__should_skip(fmt, hists))
 			continue;
 
-		if (!first)
+		if (!first && !span)
 			fprintf(fp, "%s", sep ?: "  ");
 		else
 			first = false;
 
-		fmt->header(fmt, hpp, hists, line);
-		fprintf(fp, "%s", hpp->buf);
+		fmt->header(fmt, hpp, hists, line, &span);
+
+		if (!span)
+			fprintf(fp, "%s", hpp->buf);
 	}
 }
 

tools/perf/util/hist.h

···
 struct perf_hpp_fmt {
 	const char *name;
 	int (*header)(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
-		      struct hists *hists, int line);
+		      struct hists *hists, int line, int *span);
 	int (*width)(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
 		     struct hists *hists);
 	int (*color)(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,

tools/perf/util/sort.c

···
 }
 
 static int __sort__hpp_header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
-			      struct hists *hists, int line __maybe_unused)
+			      struct hists *hists, int line __maybe_unused,
+			      int *span __maybe_unused)
 {
 	struct hpp_sort_entry *hse;
 	size_t len = fmt->user_len;
···
 
 static int __sort__hde_header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
 			      struct hists *hists __maybe_unused,
-			      int line __maybe_unused)
+			      int line __maybe_unused,
+			      int *span __maybe_unused)
 {
 	struct hpp_dynamic_entry *hde;
 	size_t len = fmt->user_len;