simpleperf: add --symdir option in report-sample command.

--symdir option is used to provide a directory containing files with
symbols. Mutliple --symdir options can be used to provide more than
one directories. For each symbol directory, simpleperf collects build
id for all elf files under it recursively. Then simpleperf can use
the collected build ids to find files with symbols.

Also fix an error in GetCompleteProcessName().

Bug: 111687223
Test: run simpleperf_unit_test.
Change-Id: Ieac5ebf7451ae85ca15c3eae37bac3c89615580b

1 files changed, 9 insertions, 0 deletions

diff --git a/simpleperf/dso.h b/simpleperf/dso.h
index 4bd0779a..83f4f651 100644
--- a/simpleperf/dso.h
+++ b/simpleperf/dso.h
@@ -36,11 +36,14 @@ class DebugElfFileFinder {
  public:
   void Reset();
   bool SetSymFsDir(const std::string& symfs_dir);
+  bool AddSymbolDir(const std::string& symbol_dir);
   void SetVdsoFile(const std::string& vdso_file, bool is_64bit);
   std::string FindDebugFile(const std::string& dso_path, bool force_64bit,
                             BuildId& build_id);
 
  private:
+  void CollectBuildIdInDir(const std::string& dir);
+
   std::string vdso_64bit_;
   std::string vdso_32bit_;
   std::string symfs_dir_;
@@ -110,7 +113,13 @@ class Dso {
  public:
   static void SetDemangle(bool demangle);
   static std::string Demangle(const std::string& name);
+  // SymFsDir is used to provide an alternative root directory looking for files with symbols.
+  // For example, if we are searching symbols for /system/lib/libc.so and SymFsDir is /data/symbols,
+  // then we will also search file /data/symbols/system/lib/libc.so.
   static bool SetSymFsDir(const std::string& symfs_dir);
+  // SymbolDir is used to add a directory containing files with symbols. Each file under it will
+  // be searched recursively to build a build_id_map.
+  static bool AddSymbolDir(const std::string& symbol_dir);
   static void SetVmlinux(const std::string& vmlinux);
   static void SetKallsyms(std::string kallsyms) {
     if (!kallsyms.empty()) {