perf annotate: Introduce annotated_source__get_line()

It's a helper function to get annotation_line at the given offset
without using the offsets array.  The goal is to get rid of the
offsets array altogether.  It just does the linear search but I
think it's better to save memory as it won't be called in a hot
path.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240404175716.1225482-4-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/ui/browsers/annotate.c

@@ -186,7 +186,7 @@ static void annotate_browser__draw_current_jump(struct ui_browser *browser)
 	 *  name right after the '<' token and probably treating this like a
 	 *  'call' instruction.
 	 */
-	target = notes->src->offsets[cursor->ops.target.offset];
+	target = annotated_source__get_line(notes->src, cursor->ops.target.offset);
 	if (target == NULL) {
 		ui_helpline__printf("WARN: jump target inconsistency, press 'o', notes->offsets[%#x] = NULL\n",
 				    cursor->ops.target.offset);

tools/perf/util/annotate.c

@@ -369,13 +369,25 @@ int addr_map_symbol__account_cycles(struct addr_map_symbol *ams,
 	return err;
 }
 
+struct annotation_line *annotated_source__get_line(struct annotated_source *src,
+						   s64 offset)
+{
+	struct annotation_line *al;
+
+	list_for_each_entry(al, &src->source, node) {
+		if (al->offset == offset)
+			return al;
+	}
+	return NULL;
+}
+
 static unsigned annotation__count_insn(struct annotation *notes, u64 start, u64 end)
 {
 	unsigned n_insn = 0;
 	u64 offset;
 
 	for (offset = start; offset <= end; offset++) {
-		if (notes->src->offsets[offset])
+		if (annotated_source__get_line(notes->src, offset))
 			n_insn++;
 	}
 	return n_insn;
@@ -405,8 +417,9 @@ static void annotation__count_and_fill(struct annotation *notes, u64 start, u64
 			return;
 
 		for (offset = start; offset <= end; offset++) {
-			struct annotation_line *al = notes->src->offsets[offset];
+			struct annotation_line *al;
 
+			al = annotated_source__get_line(notes->src, offset);
 			if (al && al->cycles && al->cycles->ipc == 0.0) {
 				al->cycles->ipc = ipc;
 				cover_insn++;
@@ -443,7 +456,7 @@ static int annotation__compute_ipc(struct annotation *notes, size_t size)
 		if (ch && ch->cycles) {
 			struct annotation_line *al;
 
-			al = notes->src->offsets[offset];
+			al = annotated_source__get_line(notes->src, offset);
 			if (al && al->cycles == NULL) {
 				al->cycles = zalloc(sizeof(*al->cycles));
 				if (al->cycles == NULL) {
@@ -466,7 +479,9 @@ static int annotation__compute_ipc(struct annotation *notes, size_t size)
 			struct cyc_hist *ch = &notes->branch->cycles_hist[offset];
 
 			if (ch && ch->cycles) {
-				struct annotation_line *al = notes->src->offsets[offset];
+				struct annotation_line *al;
+
+				al = annotated_source__get_line(notes->src, offset);
 				if (al)
 					zfree(&al->cycles);
 			}
@@ -1326,9 +1341,10 @@ annotation__mark_jump_targets(struct annotation *notes, struct symbol *sym)
 		return;
 
 	for (offset = 0; offset < size; ++offset) {
-		struct annotation_line *al = notes->src->offsets[offset];
+		struct annotation_line *al;
 		struct disasm_line *dl;
 
+		al = annotated_source__get_line(notes->src, offset);
 		dl = disasm_line(al);
 
 		if (!disasm_line__is_valid_local_jump(dl, sym))

tools/perf/util/annotate.h

@@ -270,6 +270,9 @@ struct annotated_source {
 	u16			max_line_len;
 };
 
+struct annotation_line *annotated_source__get_line(struct annotated_source *src,
+						   s64 offset);
+
 /**
  * struct annotated_branch - basic block and IPC information for a symbol.
  *