Fix issues in libunwindstack.

- Add a load_bias field in MapInfo so that it can be loaded offline,
  and also so it can be cached.
- Add an Add function to the Maps class so that it's possible to manually
  create a map.
- Remove the OfflineMaps class since I haven't found a reason for this to
  exist.
- Add a pointer to the gnu debugdata compressed section in the interface
  itself and modify the step path to try eh_frame, then debug_frame, then
  gnu_debugdata. This way arm can add exidx as the last step behind
  gnu_debugdata. Add an offline test to verify the order of unwind.
- Fix x86_64_ucontext_t since it was a different size on 32 bit and 64 bit
  systems.

Test: Pass new unit tests.
Change-Id: I978b70d6c244bd307c62a29886d24c1a8cb2af23

1 files changed, 3 insertions, 8 deletions

diff --git a/libunwindstack/include/unwindstack/Maps.h b/libunwindstack/include/unwindstack/Maps.h
index 34fef7f..17a2d28 100644
--- a/libunwindstack/include/unwindstack/Maps.h
+++ b/libunwindstack/include/unwindstack/Maps.h
@@ -42,6 +42,9 @@ class Maps {
 
   virtual const std::string GetMapsFile() const { return ""; }
 
+  void Add(uint64_t start, uint64_t end, uint64_t offset, uint64_t flags, const std::string& name,
+           uint64_t load_bias);
+
   typedef std::vector<MapInfo*>::iterator iterator;
   iterator begin() { return maps_.begin(); }
   iterator end() { return maps_.end(); }
@@ -100,14 +103,6 @@ class FileMaps : public Maps {
   const std::string file_;
 };
 
-class OfflineMaps : public FileMaps {
- public:
-  OfflineMaps(const std::string& file) : FileMaps(file) {}
-  virtual ~OfflineMaps() = default;
-
-  bool Parse() override;
-};
-
 }  // namespace unwindstack
 
 #endif  // _LIBUNWINDSTACK_MAPS_H