macro processor: Make @#include and @#includepath immutable

src/macro/Directives.cc

@@ -41,13 +41,19 @@ Eval::interpret(ostream &output, bool no_line_macro)
 
 void
 Include::interpret(ostream &output, bool no_line_macro)
+{
+  error(StackTrace("@#include", "should never be interpreted", location));
+}
+
+string
+Include::interpretAndGetName()
 {
   try
     {
       StringPtr msp = dynamic_pointer_cast<String>(expr->eval());
       if (!msp)
         throw StackTrace("File name does not evaluate to a string");
-      name = *msp;
+      return msp->to_string();
     }
   catch (StackTrace &ex)
     {
@@ -58,17 +64,24 @@ Include::interpret(ostream &output, bool no_line_macro)
     {
       error(StackTrace("@#include", e.what(), location));
     }
+  return "";
 }
 
 void
 IncludePath::interpret(ostream &output, bool no_line_macro)
+{
+error(StackTrace("@#includepath", "should never be interpreted", location));
+}
+
+string
+IncludePath::interpretAndGetPath()
 {
   try
     {
       StringPtr msp = dynamic_pointer_cast<String>(expr->eval());
       if (!msp)
         throw StackTrace("File name does not evaluate to a string");
-      path = *msp;
+      return *msp;
     }
   catch (StackTrace &ex)
     {
@@ -79,6 +92,7 @@ IncludePath::interpret(ostream &output, bool no_line_macro)
     {
       error(StackTrace("@#includepath", e.what(), location));
     }
+  return "";
 }
 
 void

src/macro/Directives.hh

@@ -66,12 +66,11 @@ namespace macro
   {
   private:
     const ExpressionPtr expr;
-    string name;
   public:
     Include(ExpressionPtr expr_arg, Environment &env_arg, Tokenizer::location location_arg) :
       Directive(env_arg, move(location_arg)), expr{move(expr_arg)} { }
     void interpret(ostream &output, bool no_line_macro) override;
-    inline const string & getName() const { return name; }
+    string interpretAndGetName();
   };
 
 
@@ -79,12 +78,11 @@ namespace macro
   {
   private:
     const ExpressionPtr expr;
-    string path;
   public:
     IncludePath(ExpressionPtr expr_arg, Environment &env_arg, Tokenizer::location location_arg) :
       Directive(env_arg, move(location_arg)), expr{move(expr_arg)} { }
     void interpret(ostream &output, bool no_line_macro) override;
-    inline const string & getPath() const { return path; }
+    string interpretAndGetPath();
   };
 
 

src/macro/Driver.cc

@@ -80,16 +80,14 @@ Driver::parse(const string &file_arg, const string &basename_arg, istream &modfi
           statement->printLineInfo(output, no_line_macro);
           printLine = false;
         }
-      statement->interpret(output, no_line_macro);
-
-      auto ipp = dynamic_pointer_cast<IncludePath>(statement);
-      if (ipp)
-        paths.emplace_back(ipp->getPath());
 
       auto ip = dynamic_pointer_cast<Include>(statement);
-      if (ip)
+      auto ipp = dynamic_pointer_cast<IncludePath>(statement);
+      if (ipp)
+        paths.emplace_back(ipp->interpretAndGetPath());
+      else if (ip)
         {
-          string filename = ip->getName();
+          string filename = ip->interpretAndGetName();
           ifstream incfile(filename, ios::binary);
           if (incfile.fail())
             {
@@ -116,6 +114,8 @@ Driver::parse(const string &file_arg, const string &basename_arg, istream &modfi
           Driver m(env, no_line_macro);
           m.parse(filename, basename, incfile, output, debug, vector<pair<string, string>>{}, paths);
         }
+      else
+        statement->interpret(output, no_line_macro);
     }
 }