begin getting ready to emit C

src/main.cc

@@ -38,12 +38,20 @@ bool preprocess(const char * input_fname)
     return true;
 }
 
+void emit_c(Node * node)
+{
+}
+
 int main(int argc, char * argv[])
 {
     bool preprocess_successful = preprocess(argv[1]);
     if (preprocess_successful)
     {
-        parse(preprocessed_fname);
+        Node * node = parse(preprocessed_fname);
+        if (node != nullptr)
+        {
+            emit_c(node);
+        }
     }
     /* Clean up temporary files. */
     if (preprocessed_fname_created)

src/parser/parser.cc

@@ -11,21 +11,23 @@ std::unordered_set<std::string> type_names;
 extern FILE * yyin;
 
 static const char * input_fname;
+static Node * translation_unit_node = nullptr;
 
-void parse(const char * filename)
+Node * parse(const char * filename)
 {
     input_fname = filename;
     yyin = fopen(filename, "r");
     if (yyin == NULL)
     {
         fprintf(stderr, "Error opening \"%s\"\n", filename);
-        return;
+        return nullptr;
     }
     if (yyparse() != 0)
     {
         fprintf(stderr, "Parsing error\n");
-        return;
+        return nullptr;
     }
+    return translation_unit_node;
 }
 
 static char * read_file(const char * filename, size_t * length)
@@ -253,3 +255,8 @@ bool is_type_name(const std::string & type_name)
     }
     return false;
 }
+
+void set_translation_unit_node(Node * _translation_unit_node)
+{
+    translation_unit_node = _translation_unit_node;
+}

src/parser/parser.h

@@ -10,9 +10,10 @@
 
 extern std::unordered_set<std::string> type_names;
 
-void parse(const char * filename);
+Node * parse(const char * filename);
 void handle_parse_error(const char * str, const YYLTYPE * yylloc);
 void observe_type_name(const Node * node);
 bool is_type_name(const std::string & type_name);
+void set_translation_unit_node(Node * _translation_unit_node);
 
 #endif

src/parser/parser.yc

@@ -1225,11 +1225,15 @@ primary_expressions
     ;
 
 translation_unit
-    : external_declaration { $$ = $1; }
+    : external_declaration {
+        $$ = $1;
+        set_translation_unit_node($$);
+    }
     | translation_unit external_declaration {
         $$ = new Node(NODE_TYPE_LIST);
         $$->list->push_back($1);
         $$->list->push_back($2);
+        set_translation_unit_node($$);
     }
     ;