simpleperf: Handle empty string in TracepointStringFinder

Avoid crash when the kernel doesn't expose any tracepoint
events.

Bug: 328598190
Test: run simpleperf_unit_test
Change-Id: I194a387c3ff94e4b669b41432530c5452a10d3a5

1 files changed, 5 insertions, 1 deletions

diff --git a/simpleperf/event_type.cpp b/simpleperf/event_type.cpp
index 0d10d12d..d8379141 100644
--- a/simpleperf/event_type.cpp
+++ b/simpleperf/event_type.cpp
@@ -104,7 +104,11 @@ class TracepointStringFinder : public EventTypeFinder {
  protected:
   void LoadTypes() override {
     for (const auto& line : android::base::Split(s_, "\n")) {
-      std::vector<std::string> items = android::base::Split(line, " ");
+      std::string str = android::base::Trim(line);
+      if (str.empty()) {
+        continue;
+      }
+      std::vector<std::string> items = android::base::Split(str, " ");
       CHECK_EQ(items.size(), 2u);
       std::string event_name = items[0];
       uint64_t id;