Simpleperf: add branch stack feature in perf.data.

Also add the function to remove old perf.data.

Bug: 19483574

Change-Id: I605bb637674d4674f95503a160de8c530fe87812

1 files changed, 16 insertions, 0 deletions

diff --git a/simpleperf/utils.cpp b/simpleperf/utils.cpp
index 5062504c..783bc8ff 100644
--- a/simpleperf/utils.cpp
+++ b/simpleperf/utils.cpp
@@ -20,6 +20,7 @@
 #include <errno.h>
 #include <stdarg.h>
 #include <stdio.h>
+#include <sys/stat.h>
 #include <unistd.h>
 
 #include <base/logging.h>
@@ -66,3 +67,18 @@ void GetEntriesInDir(const std::string& dirpath, std::vector<std::string>* files
   }
   closedir(dir);
 }
+
+bool RemovePossibleFile(const std::string& filename) {
+  struct stat st;
+  if (stat(filename.c_str(), &st) == 0) {
+    if (!S_ISREG(st.st_mode)) {
+      LOG(ERROR) << filename << " is not a file.";
+      return false;
+    }
+    if (unlink(filename.c_str()) == -1) {
+      PLOG(ERROR) << "unlink(" << filename << ") failed";
+      return false;
+    }
+  }
+  return true;
+}