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Diffstat (limited to 'gcc-4.8.3/gcc/ada/prj-ext.ads')
| -rw-r--r-- | gcc-4.8.3/gcc/ada/prj-ext.ads | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/gcc-4.8.3/gcc/ada/prj-ext.ads b/gcc-4.8.3/gcc/ada/prj-ext.ads new file mode 100644 index 000000000..01719cf45 --- /dev/null +++ b/gcc-4.8.3/gcc/ada/prj-ext.ads @@ -0,0 +1,140 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- P R J . E X T -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 2000-2011, Free Software Foundation, Inc. -- +-- -- +-- GNAT is free software; you can redistribute it and/or modify it under -- +-- terms of the GNU General Public License as published by the Free Soft- -- +-- ware Foundation; either version 3, or (at your option) any later ver- -- +-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- +-- OUT 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 distributed with GNAT; see file COPYING3. If not, go to -- +-- http://www.gnu.org/licenses for a complete copy of the license. -- +-- -- +-- GNAT was originally developed by the GNAT team at New York University. -- +-- Extensive contributions were provided by Ada Core Technologies Inc. -- +-- -- +------------------------------------------------------------------------------ + +-- Subprograms to set, get and cache external references, to be used as +-- External functions in project files. + +with GNAT.Dynamic_HTables; + +package Prj.Ext is + + ------------------------- + -- External References -- + ------------------------- + + -- External references influence the way a project tree is processed (in + -- particular they provide the values for the typed string variables that + -- are then used in case constructions). + + -- External references are project-tree specific, so that when multiple + -- trees are loaded in parallel we can have different scenarios (or even + -- load the same tree twice and see different views of it). + + type External_References is private; + No_External_Refs : constant External_References; + + procedure Initialize + (Self : out External_References; + Copy_From : External_References := No_External_Refs); + -- Initialize Self, and copy all values from Copy_From if needed. + -- This has no effect if Self was already initialized. + + procedure Free (Self : in out External_References); + -- Free memory used by Self + + type External_Source is + (From_Command_Line, + From_Environment, + From_External_Attribute); + -- Indicates where was the value of an external reference defined. They are + -- prioritized in that order, so that a user can always use the command + -- line to override a value coming from his environment, or an environment + -- variable to override a value defined in an aggregate project through the + -- "for External()..." attribute. + + procedure Add + (Self : External_References; + External_Name : String; + Value : String; + Source : External_Source := External_Source'First); + -- Add an external reference (or modify an existing one). No overriding is + -- done if the Source's priority is less than the one used to previously + -- set the value of the variable. The default for Source is such that + -- overriding always occurs. + + function Value_Of + (Self : External_References; + External_Name : Name_Id; + With_Default : Name_Id := No_Name) + return Name_Id; + -- Get the value of an external reference, and cache it for future uses + + function Check + (Self : External_References; + Declaration : String) return Boolean; + -- Check that an external declaration <external>=<value> is correct. + -- If it is correct, the external reference is Added. + + procedure Reset (Self : External_References); + -- Clear the internal data structure that stores the external references + -- and free any allocated memory. + +private + -- Use a Static_HTable, rather than a Simple_HTable + + -- The issue is that we need to be able to copy the contents of the table + -- (in Initialize), but this isn't doable for Simple_HTable for which + -- iterators do not return the key. + + type Name_To_Name; + type Name_To_Name_Ptr is access all Name_To_Name; + type Name_To_Name is record + Key : Name_Id; + Value : Name_Id; + Source : External_Source; + Next : Name_To_Name_Ptr; + end record; + + procedure Set_Next (E : Name_To_Name_Ptr; Next : Name_To_Name_Ptr); + function Next (E : Name_To_Name_Ptr) return Name_To_Name_Ptr; + function Get_Key (E : Name_To_Name_Ptr) return Name_Id; + + package Name_To_Name_HTable is new GNAT.Dynamic_HTables.Static_HTable + (Header_Num => Header_Num, + Element => Name_To_Name, + Elmt_Ptr => Name_To_Name_Ptr, + Null_Ptr => null, + Set_Next => Set_Next, + Next => Next, + Key => Name_Id, + Get_Key => Get_Key, + Hash => Hash, + Equal => "="); + -- General type for htables associating name_id to name_id. This is in + -- particular used to store the values of external references. + + type Instance_Access is access all Name_To_Name_HTable.Instance; + + type External_References is record + Refs : Instance_Access; + -- External references are stored in this hash table (and manipulated + -- through subprogrames in prj-ext.ads). External references are + -- project-tree specific so that one can load the same tree twice but + -- have two views of it, for instance. + end record; + + No_External_Refs : constant External_References := (Refs => null); + +end Prj.Ext; |