Fix nullptr in mace_run when build with code mode

docs/development/how_to_debug.rst

@@ -90,7 +90,7 @@ For android, you can use `ndk-stack tools <https://developer.android.com/ndk/gui
 
   .. code:: sh
 
-    adb logcat | $NDK/ndk-stack -sym /path/to/local/binary/directory/
+    adb logcat | $ANDROID_NDK_HOME/ndk-stack -sym /path/to/local/binary/directory/
 
 
 Debug memory usage

mace/benchmark/benchmark_model.cc

@@ -25,6 +25,7 @@
 #include "mace/port/file_system.h"
 #include "mace/public/mace.h"
 #include "mace/utils/logging.h"
+#include "mace/utils/memory.h"
 #include "mace/utils/math.h"
 #include "mace/benchmark/statistics.h"
 #ifdef MODEL_GRAPH_FORMAT_CODE
@@ -284,7 +285,8 @@ int Main(int argc, char **argv) {
   std::shared_ptr<mace::MaceEngine> engine;
   MaceStatus create_engine_status;
   // Create Engine
-  std::unique_ptr<mace::port::ReadOnlyMemoryRegion> model_graph_data;
+  std::unique_ptr<mace::port::ReadOnlyMemoryRegion> model_graph_data =
+    make_unique<mace::port::ReadOnlyBufferMemoryRegion>();
   if (FLAGS_model_file != "") {
     auto fs = GetFileSystem();
     auto status = fs->NewReadOnlyMemoryRegionFromFile(FLAGS_model_file.c_str(),
@@ -294,7 +296,8 @@ int Main(int argc, char **argv) {
     }
   }
 
-  std::unique_ptr<mace::port::ReadOnlyMemoryRegion> model_weights_data;
+  std::unique_ptr<mace::port::ReadOnlyMemoryRegion> model_weights_data =
+    make_unique<mace::port::ReadOnlyBufferMemoryRegion>();
   if (FLAGS_model_data_file != "") {
     auto fs = GetFileSystem();
     auto status = fs->NewReadOnlyMemoryRegionFromFile(

mace/examples/cli/example.cc

@@ -31,6 +31,7 @@
 #include "mace/port/file_system.h"
 #include "mace/public/mace.h"
 #include "mace/utils/logging.h"
+#include "mace/utils/memory.h"
 #include "mace/utils/string_util.h"
 // if convert model to code.
 #ifdef MODEL_GRAPH_FORMAT_CODE
@@ -201,7 +202,8 @@ bool RunModel(const std::vector<std::string> &input_names,
   std::shared_ptr<mace::MaceEngine> engine;
   MaceStatus create_engine_status;
 
-  std::unique_ptr<mace::port::ReadOnlyMemoryRegion> model_graph_data;
+  std::unique_ptr<mace::port::ReadOnlyMemoryRegion> model_graph_data =
+    make_unique<mace::port::ReadOnlyBufferMemoryRegion>();
   if (FLAGS_model_file != "") {
     auto fs = GetFileSystem();
     auto status = fs->NewReadOnlyMemoryRegionFromFile(FLAGS_model_file.c_str(),
@@ -211,7 +213,8 @@ bool RunModel(const std::vector<std::string> &input_names,
     }
   }
 
-  std::unique_ptr<mace::port::ReadOnlyMemoryRegion> model_weights_data;
+  std::unique_ptr<mace::port::ReadOnlyMemoryRegion> model_weights_data =
+    make_unique<mace::port::ReadOnlyBufferMemoryRegion>();
   if (FLAGS_model_data_file != "") {
     auto fs = GetFileSystem();
     auto status = fs->NewReadOnlyMemoryRegionFromFile(

mace/port/file_system.h

@@ -27,8 +27,21 @@ class ReadOnlyMemoryRegion {
  public:
   ReadOnlyMemoryRegion() = default;
   virtual ~ReadOnlyMemoryRegion() = default;
-  virtual const void *data() = 0;
-  virtual uint64_t length() = 0;
+  virtual const void *data() const = 0;
+  virtual uint64_t length() const = 0;
+};
+
+class ReadOnlyBufferMemoryRegion : public ReadOnlyMemoryRegion {
+ public:
+  ReadOnlyBufferMemoryRegion() : data_(nullptr), length_(0) {}
+  ReadOnlyBufferMemoryRegion(const void *data, uint64_t length) :
+    data_(data), length_(length) {}
+  const void *data() const override { return data_; }
+  uint64_t length() const override { return length_; }
+
+ private:
+  const void *data_;
+  uint64_t length_;
 };
 
 class FileSystem {

mace/port/posix/file_system.cc

@@ -38,8 +38,8 @@ class PosixReadOnlyMemoryRegion : public ReadOnlyMemoryRegion {
       munmap(const_cast<void *>(addr_), length_);
     }
   };
-  const void *data() override { return addr_; };
-  uint64_t length() override { return length_; };
+  const void *data() const override { return addr_; };
+  uint64_t length() const override { return length_; };
 
  private:
   const void *addr_;

mace/tools/validation/mace_run.cc

@@ -37,6 +37,7 @@
 #include "mace/port/env.h"
 #include "mace/port/file_system.h"
 #include "mace/utils/logging.h"
+#include "mace/utils/memory.h"
 #include "mace/utils/string_util.h"
 
 #ifdef MODEL_GRAPH_FORMAT_CODE
@@ -244,7 +245,8 @@ bool RunModel(const std::string &model_name,
   }
 #endif  // MACE_ENABLE_OPENCL
 
-  std::unique_ptr<mace::port::ReadOnlyMemoryRegion> model_graph_data;
+  std::unique_ptr<mace::port::ReadOnlyMemoryRegion> model_graph_data =
+    make_unique<mace::port::ReadOnlyBufferMemoryRegion>();
   if (FLAGS_model_file != "") {
     auto fs = GetFileSystem();
     status = fs->NewReadOnlyMemoryRegionFromFile(FLAGS_model_file.c_str(),
@@ -254,7 +256,8 @@ bool RunModel(const std::string &model_name,
     }
   }
 
-  std::unique_ptr<mace::port::ReadOnlyMemoryRegion> model_weights_data;
+  std::unique_ptr<mace::port::ReadOnlyMemoryRegion> model_weights_data =
+    make_unique<mace::port::ReadOnlyBufferMemoryRegion>();
   if (FLAGS_model_data_file != "") {
     auto fs = GetFileSystem();
     status = fs->NewReadOnlyMemoryRegionFromFile(FLAGS_model_data_file.c_str(),