-- --
-- S p e c --
-- --
--- Copyright (C) 1999-2007, Free Software Foundation, Inc. --
+-- Copyright (C) 1999-2009, 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- --
-- about uses of uninitialized variables and unused with's. It also has
-- some unrelated routines related to the generation of warnings.
+with Alloc; use Alloc;
+with Table;
with Types; use Types;
package Sem_Warn is
+ ------------------------
+ -- Warnings Off Table --
+ ------------------------
+
+ type Warnings_Off_Entry is record
+ N : Node_Id;
+ -- A pragma Warnings (Off, ent) node
+
+ E : Entity_Id;
+ -- The entity involved
+ end record;
+
+ -- An entry is made in the following table for any valid Pragma Warnings
+ -- (Off, entity) encountered while Opt.Warn_On_Warnings_Off is True. It
+ -- is used to generate warnings on any of these pragmas that turn out not
+ -- to be needed, or that could be replaced by Unmodified/Unreferenced.
+
+ package Warnings_Off_Pragmas is new Table.Table (
+ Table_Component_Type => Warnings_Off_Entry,
+ Table_Index_Type => Int,
+ Table_Low_Bound => 0,
+ Table_Initial => Alloc.Warnings_Off_Pragmas_Initial,
+ Table_Increment => Alloc.Warnings_Off_Pragmas_Increment,
+ Table_Name => "Name_Warnings_Off_Pragmas");
+
--------------------
-- Initialization --
--------------------
+ procedure Initialize;
+ -- Initialize this package for new compilation
+
function Set_Warning_Switch (C : Character) return Boolean;
-- This function sets the warning switch or switches corresponding to the
-- given character. It is used to process a -gnatw switch on the command
-- the command line or .C in a string literal in pragma Warnings. Returns
-- True for valid warning character C, False for invalid character.
+ procedure Set_GNAT_Mode_Warnings;
+ -- This is called in -gnatg mode to set the warnings for gnat mode. It is
+ -- also used to set the proper warning statuses for -gnatw.g.
+
------------------------------------------
-- Routines to Handle Unused References --
------------------------------------------
-- Output Routines --
---------------------
- procedure Output_Non_Modifed_In_Out_Warnings;
+ procedure Output_Non_Modified_In_Out_Warnings;
-- Warnings about IN OUT parameters that could be IN are collected till
-- the end of the compilation process (see body of this routine for a
-- discussion of why this is done). This procedure outputs the warnings.
-- the compilation process (see Check_Unset_Reference for further
-- details). This procedure outputs waiting warnings, if any.
+ procedure Output_Unused_Warnings_Off_Warnings;
+ -- Warnings about pragma Warnings (Off, ent) statements that are unused,
+ -- or could be replaced by Unmodified/Unreferenced pragmas, are collected
+ -- till the end of the compilation process. This procedure outputs waiting
+ -- warnings if any.
+
----------------------------
-- Other Warning Routines --
----------------------------
-- N is the node for a loop statement. This procedure checks if a warning
-- should be given for a possible infinite loop, and if so issues it.
+ procedure Check_Low_Bound_Tested (Expr : Node_Id);
+ -- Expr is the node for a comparison operation. This procedure checks if
+ -- the comparison is a source comparison of P'First with some other value
+ -- and if so, sets the Low_Bound_Tested flag on entity P to suppress
+ -- warnings about improper low bound assumptions (we assume that if the
+ -- code has a test that explicitly checks P'First, then it is not operating
+ -- in blind assumption mode).
+
procedure Warn_On_Known_Condition (C : Node_Id);
- -- C is a node for a boolean expression resluting from a relational
+ -- C is a node for a boolean expression resulting from a relational
-- or membership operation. If the expression has a compile time known
-- value, then a warning is output if all the following conditions hold:
--
-- as an out parameter. True if either Warn_On_Modified_Unread is set for
-- an only OUT parameter, or if Warn_On_All_Unread_Out_Parameters is set.
+ procedure Warn_On_Overlapping_Actuals (Subp : Entity_Id; N : Node_Id);
+ -- Called on a subprogram call. Checks whether an IN OUT actual that is
+ -- not by-copy may overlap with another actual, thus leading to aliasing
+ -- in the body of the called subprogram.
+
procedure Warn_On_Suspicious_Index (Name : Entity_Id; X : Node_Id);
-- This is called after resolving an indexed component or a slice. Name
-- is the entity for the name of the indexed array, and X is the subscript
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