vhdl: recognize some functions of math_real.

1 files changed, 58 insertions, 0 deletions

diff --git a/src/vhdl/vhdl-ieee-math_real.adb b/src/vhdl/vhdl-ieee-math_real.adb
new file mode 100644
index 000000000..d62e4c246
--- /dev/null
+++ b/src/vhdl/vhdl-ieee-math_real.adb
@@ -0,0 +1,58 @@
+--  Nodes recognizer for ieee.math_real.
+--  Copyright (C) 2019 Tristan Gingold
+--
+--  GHDL 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 2, or (at your option) any later
+--  version.
+--
+--  GHDL 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 GHDL; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+
+with Std_Names; use Std_Names;
+
+package body Vhdl.Ieee.Math_Real is
+   procedure Extract_Declarations (Pkg : Iir_Package_Declaration)
+   is
+      Decl : Iir;
+      Predef : Iir_Predefined_Functions;
+   begin
+      Math_Real_Pkg := Pkg;
+
+      Decl := Get_Declaration_Chain (Pkg);
+
+      --  Skip a potential copyright constant.
+      Decl := Skip_Copyright_Notice (Decl);
+
+      --  Skip any declarations but functions.
+      loop
+         Decl := Get_Chain (Decl);
+         exit when Decl = Null_Iir;
+
+         case Get_Kind (Decl) is
+            when Iir_Kind_Function_Declaration =>
+               Predef := Iir_Predefined_None;
+               case Get_Identifier (Decl) is
+                  when Name_Ceil =>
+                     Predef := Iir_Predefined_Ieee_Math_Real_Ceil;
+                  when Name_Log2 =>
+                     Predef := Iir_Predefined_Ieee_Math_Real_Log2;
+                  when others =>
+                     null;
+               end case;
+               Set_Implicit_Definition (Decl, Predef);
+            when Iir_Kind_Constant_Declaration =>
+               null;
+            when others =>
+               null;
+         end case;
+      end loop;
+   end Extract_Declarations;
+end Vhdl.Ieee.Math_Real;