From 5959fbb5524bbeb05a96eb15aba59e961a3efcb7 Mon Sep 17 00:00:00 2001
From: Eugen Wissner <belka@caraus.de>
Date: Sun, 15 Feb 2026 04:10:38 +0100
Subject: Initial commit

---
 gcc/elna-diagnostic.cc | 167 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 167 insertions(+)
 create mode 100644 gcc/elna-diagnostic.cc

(limited to 'gcc/elna-diagnostic.cc')

diff --git a/gcc/elna-diagnostic.cc b/gcc/elna-diagnostic.cc
new file mode 100644
index 0000000..162d6cb
--- /dev/null
+++ b/gcc/elna-diagnostic.cc
@@ -0,0 +1,167 @@
+/* Elna frontend specific diagnostic routines.
+   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/>.  */
+
+#include "elna/gcc/elna-diagnostic.h"
+#include "elna/gcc/elna-tree.h"
+#include "elna/gcc/elna1.h"
+
+namespace elna::gcc
+{
+    linemap_guard::linemap_guard(const char *filename)
+    {
+        linemap_add(line_table, LC_ENTER, 0, filename, 1);
+    }
+
+    linemap_guard::~linemap_guard()
+    {
+        linemap_add(line_table, LC_LEAVE, 0, NULL, 0);
+    }
+
+    location_t get_location(const frontend::position *position)
+    {
+        linemap_line_start(line_table, position->line, 0);
+
+        return linemap_position_for_column(line_table, position->column);
+    }
+
+    std::string print_aggregate_name(tree type, const std::string& kind_name)
+    {
+        if (TYPE_IDENTIFIER(type) == NULL_TREE)
+        {
+            return kind_name;
+        }
+        else
+        {
+            return std::string(IDENTIFIER_POINTER(TYPE_IDENTIFIER(type)));
+        }
+    }
+
+    std::string print_type(tree type)
+    {
+        gcc_assert(TYPE_P(type));
+
+        tree unqualified_type = get_qualified_type(type, TYPE_UNQUALIFIED);
+        tree_code code = TREE_CODE(type);
+
+        if (unqualified_type == elna_int_type_node)
+        {
+            return "Int";
+        }
+        else if (unqualified_type == elna_word_type_node)
+        {
+            return "Word";
+        }
+        else if (unqualified_type == elna_bool_type_node)
+        {
+            return "Bool";
+        }
+        else if (unqualified_type == elna_pointer_type_node)
+        {
+            return "Pointer";
+        }
+        else if (unqualified_type == elna_float_type_node)
+        {
+            return "Float";
+        }
+        else if (unqualified_type == elna_char_type_node)
+        {
+            return "Char";
+        }
+        else if (unqualified_type == elna_string_type_node)
+        {
+            return "String";
+        }
+        else if (is_void_type(unqualified_type)) // For procedures without a return type.
+        {
+            return "()";
+        }
+        else if (POINTER_TYPE_P(unqualified_type))
+        {
+            tree pointer_target_type = TREE_TYPE(type);
+
+            if (TREE_CODE(pointer_target_type) == FUNCTION_TYPE)
+            {
+                return print_type(pointer_target_type);
+            }
+            else
+            {
+                return std::string("^" + print_type(pointer_target_type));
+            }
+        }
+        else if (code == FUNCTION_TYPE)
+        {
+            std::string output = "proc(";
+            tree parameter_type = TYPE_ARG_TYPES(type);
+            while (TREE_VALUE(parameter_type) != void_type_node)
+            {
+                output += print_type(TREE_VALUE(parameter_type));
+                parameter_type = TREE_CHAIN(parameter_type);
+                if (TREE_VALUE(parameter_type) == void_type_node)
+                {
+                    break;
+                }
+                else
+                {
+                    output += ", ";
+                }
+            }
+            output += ')';
+            tree return_type = TREE_TYPE(type);
+
+            if (!is_void_type(return_type))
+            {
+                output += " -> " + print_type(return_type);
+            }
+            return output;
+        }
+        else if (code == ARRAY_TYPE)
+        {
+            return "array";
+        }
+        else if (code == RECORD_TYPE)
+        {
+            return print_aggregate_name(unqualified_type, "record");
+        }
+        else if (code == UNION_TYPE)
+        {
+            return print_aggregate_name(unqualified_type, "union");
+        }
+        else if (code == ENUMERAL_TYPE)
+        {
+            return print_aggregate_name(unqualified_type, "enumeration");
+        }
+        else
+        {
+            return "<<unknown-type>>";
+        }
+        gcc_unreachable();
+    }
+
+    void report_errors(const std::deque<std::unique_ptr<frontend::error>>& errors)
+    {
+        for (const auto& error : errors)
+        {
+            location_t gcc_location{ UNKNOWN_LOCATION };
+
+            if (error->position.line != 0 || error->position.column != 0)
+            {
+                gcc_location = elna::gcc::get_location(&error->position);
+            }
+            error_at(gcc_location, error->what().c_str());
+        }
+    }
+}
-- 
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