Add the file a symbol is declared in to Reflection

CMakeLists.txt

@@ -443,6 +443,7 @@ function(compile_flatbuffers_schema_to_binary SRC_FBS)
     OUTPUT ${GEN_BINARY_SCHEMA}
     COMMAND "${FLATBUFFERS_FLATC_EXECUTABLE}"
             -b --schema --bfbs-comments --bfbs-builtins
+            --bfbs-filenames ${SRC_FBS_DIR}
             -I "${CMAKE_CURRENT_SOURCE_DIR}/tests/include_test"
             -o "${SRC_FBS_DIR}"
             "${CMAKE_CURRENT_SOURCE_DIR}/${SRC_FBS}"
@@ -468,6 +469,7 @@ function(compile_flatbuffers_schema_to_embedded_binary SRC_FBS OPT)
           --cpp-ptr-type flatbuffers::unique_ptr # Used to test with C++98 STLs
           ${OPT}
           --bfbs-comments --bfbs-builtins --bfbs-gen-embed
+          --bfbs-filenames ${SRC_FBS_DIR}
           -I "${CMAKE_CURRENT_SOURCE_DIR}/tests/include_test"
           -o "${SRC_FBS_DIR}"
           "${CMAKE_CURRENT_SOURCE_DIR}/${SRC_FBS}"

grpc/examples/generate.sh

@@ -41,7 +41,7 @@ generator="--grpc $current_dir/greeter.fbs"
 cd go
 
 cd greeter
-fbc --go ${generator}
+fbc --bfbs-filenames ../.. --go ${generator}
 
 cd ${current_dir}
 
@@ -50,22 +50,22 @@ cd python
 
 cd greeter
 
-fbc --python ${generator}
+fbc --bfbs-filenames ../.. --python ${generator}
 
 cd ${current_dir}
 
 # Regenerate Swift code
 cd swift
 
 cd Greeter/Sources/Model
-fbc --swift ${generator}
+fbc --bfbs-filenames ../../../.. --swift ${generator}
 
 cd ${current_dir}
 
 # Regenerate Typescript code
 cd ts
 
 cd greeter/src
-fbc --ts ${generator}
+fbc --bfbs-filenames ../../.. --ts ${generator}
 
 cd ${current_dir}

include/flatbuffers/idl.h

@@ -266,7 +266,8 @@ struct Definition {
         defined_namespace(nullptr),
         serialized_location(0),
         index(-1),
-        refcount(1) {}
+        refcount(1),
+        declaration_file(nullptr) {}
 
   flatbuffers::Offset<
       flatbuffers::Vector<flatbuffers::Offset<reflection::KeyValue>>>
@@ -286,6 +287,7 @@ struct Definition {
   uoffset_t serialized_location;
   int index;  // Inside the vector it is stored.
   int refcount;
+  const std::string *declaration_file;
 };
 
 struct FieldDef : public Definition {
@@ -587,6 +589,7 @@ struct IDLOptions {
   std::string filename_suffix;
   std::string filename_extension;
   bool no_warnings;
+  std::string project_root;
 
   // Possible options for the more general generator below.
   enum Language {
@@ -672,6 +675,7 @@ struct IDLOptions {
         filename_suffix("_generated"),
         filename_extension(),
         no_warnings(false),
+        project_root(""),
         lang(IDLOptions::kJava),
         mini_reflect(IDLOptions::kNone),
         require_explicit_ids(false),
@@ -936,14 +940,15 @@ class Parser : public ParserState {
   StructDef *LookupCreateStruct(const std::string &name,
                                 bool create_if_new = true,
                                 bool definition = false);
-  FLATBUFFERS_CHECKED_ERROR ParseEnum(bool is_union, EnumDef **dest);
+  FLATBUFFERS_CHECKED_ERROR ParseEnum(bool is_union, EnumDef **dest,
+                                      const char *filename);
   FLATBUFFERS_CHECKED_ERROR ParseNamespace();
   FLATBUFFERS_CHECKED_ERROR StartStruct(const std::string &name,
                                         StructDef **dest);
   FLATBUFFERS_CHECKED_ERROR StartEnum(const std::string &name, bool is_union,
                                       EnumDef **dest);
-  FLATBUFFERS_CHECKED_ERROR ParseDecl();
-  FLATBUFFERS_CHECKED_ERROR ParseService();
+  FLATBUFFERS_CHECKED_ERROR ParseDecl(const char *filename);
+  FLATBUFFERS_CHECKED_ERROR ParseService(const char *filename);
   FLATBUFFERS_CHECKED_ERROR ParseProtoFields(StructDef *struct_def,
                                              bool isextend, bool inside_oneof);
   FLATBUFFERS_CHECKED_ERROR ParseProtoOption();
@@ -980,6 +985,8 @@ class Parser : public ParserState {
   FLATBUFFERS_CHECKED_ERROR RecurseError();
   template<typename F> CheckedError Recurse(F f);
 
+  const std::string &GetPooledString(const std::string &s) const;
+
  public:
   SymbolTable<Type> types_;
   SymbolTable<StructDef> structs_;
@@ -1015,6 +1022,10 @@ class Parser : public ParserState {
 
   std::vector<std::pair<Value, FieldDef *>> field_stack_;
 
+  // TODO(cneo): Refactor parser to use string_cache more often to save
+  // on memory usage.
+  mutable std::set<std::string> string_cache_;
+
   int anonymous_counter_;
   int parse_depth_counter_;  // stack-overflow guard
 };