Move source reading into a function

include/elna/boot/dependency.h

@@ -0,0 +1,41 @@
+/* Dependency graph analysis.
+   Copyright (C) 2025 Free Software Foundation, Inc.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#pragma once
+
+#include <fstream>
+#include "elna/boot/result.h"
+#include "elna/boot/ast.h"
+
+namespace elna::boot
+{
+    class dependency_graph
+    {
+        error_list m_errors;
+
+    public:
+        std::vector<std::unique_ptr<program>> modules;
+
+        bool has_errors() const;
+        const error_list& errors() const;
+
+        dependency_graph();
+        explicit dependency_graph(error_list&& errors);
+    };
+
+    dependency_graph read_sources(std::istream& entry_point, const char *entry_path);
+}

include/elna/boot/result.h

@@ -61,17 +61,19 @@ namespace elna::boot
         std::size_t column() const;
     };
 
+    using error_list = typename std::deque<std::unique_ptr<error>>;
+
     class error_container
     {
     protected:
-        std::deque<std::unique_ptr<error>> m_errors;
+        error_list m_errors;
 
         error_container(const char *input_file);
 
     public:
         const char *input_file;
 
-        std::deque<std::unique_ptr<error>>& errors();
+        error_list& errors();
 
         template<typename T, typename... Args>
         void add_error(Args... arguments)
@@ -102,5 +104,4 @@ namespace elna::boot
         T proper_type{};
         bool no_return{ false };
     };
-
 }

include/elna/boot/semantic.h

@@ -15,6 +15,8 @@ You should have received a copy of the GNU General Public License
 along with GCC; see the file COPYING3.  If not see
 <http://www.gnu.org/licenses/>.  */
 
+#pragma once
+
 #include <string>
 #include <unordered_map>
 #include <memory>

include/elna/gcc/elna-generic.h

@@ -34,7 +34,7 @@ along with GCC; see the file COPYING3.  If not see
 namespace elna::gcc
 {
     std::deque<std::unique_ptr<boot::error>> do_semantic_analysis(const char *path,
-            std::unique_ptr<boot::program>& ast, std::shared_ptr<boot::symbol_table> info_table,
+            const std::unique_ptr<boot::program>& ast, std::shared_ptr<boot::symbol_table> info_table,
             std::shared_ptr<symbol_table> symbols, std::unordered_map<std::string, tree>& unresolved);
     tree handle_symbol(const std::string& symbol_name, std::shared_ptr<boot::alias_type> reference,
             std::shared_ptr<symbol_table> symbols, std::unordered_map<std::string, tree>& unresolved,