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-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- S E M _ W A R N --
--- --
--- S p e c --
--- --
--- Copyright (C) 1999-2008, 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. --
--- --
-------------------------------------------------------------------------------
-
--- This package contains the routines used to deal with issuing warnings
--- 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
- -- line, or a character in a string literal in pragma Warnings. Returns
- -- True for valid warning character C, False for invalid character.
-
- function Set_Dot_Warning_Switch (C : Character) return Boolean;
- -- This function sets the warning switch or switches corresponding to the
- -- given character preceded by a dot. Used to process a -gnatw. switch on
- -- the command line or .C in a string literal in pragma Warnings. Returns
- -- True for valid warning character C, False for invalid character.
-
- ------------------------------------------
- -- Routines to Handle Unused References --
- ------------------------------------------
-
- procedure Check_References (E : Entity_Id; Anod : Node_Id := Empty);
- -- Called at the end of processing a declarative region. The entity E
- -- is the entity for the scope. All entities declared in the region,
- -- as indicated by First_Entity and the entity chain, are checked to
- -- see if they are variables for which warnings need to be posted for
- -- either no assignments, or a use before an assignment or no references
- -- at all. The Anod node is present for the case of an accept statement,
- -- and references the accept statement. This is used to place the warning
- -- messages in the right place.
-
- procedure Check_Unset_Reference (N : Node_Id);
- -- N is the node for an expression which occurs in a reference position,
- -- e.g. as the right side of an assignment. This procedure checks to see
- -- if the node is a reference to a variable entity where the entity has
- -- Not_Assigned set. If so, the Unset_Reference field is set if it is not
- -- the first occurrence. No warning is posted, instead warnings will be
- -- posted later by Check_References. The reason we do things that
- -- way is that if there are no assignments anywhere, we prefer to flag
- -- the entity, rather than a reference to it. Note that for the purposes
- -- of this routine, a type conversion or qualified expression whose
- -- expression is an entity is also processed. The reason that we do not
- -- process these at the point of occurrence is that both these constructs
- -- can occur in non-reference positions (e.g. as out parameters).
-
- procedure Check_Unused_Withs (Spec_Unit : Unit_Number_Type := No_Unit);
- -- This routine performs two kinds of checks. It checks that all with'ed
- -- units are referenced, and that at least one entity of each with'ed
- -- unit is referenced (the latter check catches units that are only
- -- referenced in a use or package renaming statement). Appropriate
- -- warning messages are generated if either of these situations is
- -- detected.
- --
- -- A special case arises when a package body or a subprogram body with
- -- a separate spec is being compiled. In this case, a with may appear
- -- on the spec, but be needed only by the body. This still generates
- -- a warning, but the text is different (the with is not redundant,
- -- it is misplaced).
- --
- -- This special case is implemented by making an initial call to this
- -- procedure with Spec_Unit set to the unit number of the separate spec.
- -- This call does not generate any warning messages, but instead may
- -- result in flags being set in the N_With_Clause node that record that
- -- there was no use in the spec.
- --
- -- The main call (made after all units have been analyzed, with Spec_Unit
- -- set to the default value of No_Unit) generates the required warnings
- -- using the flags set by the initial call where appropriate to specialize
- -- the text of the warning messages.
-
- ---------------------
- -- Output Routines --
- ---------------------
-
- procedure Output_Non_Modifed_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.
- -- Note: this should be called before Output_Unreferenced_Messages, since
- -- if we have an IN OUT warning, that's the one we want to see!
-
- procedure Output_Obsolescent_Entity_Warnings (N : Node_Id; E : Entity_Id);
- -- N is a reference to obsolescent entity E, for which appropriate warning
- -- messages are to be generated (caller has already checked that warnings
- -- are active and appropriate for this entity).
-
- procedure Output_Unreferenced_Messages;
- -- Warnings about unreferenced entities are collected till the end of
- -- 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 --
- ----------------------------
-
- procedure Check_Code_Statement (N : Node_Id);
- -- Perform warning checks on a code statement node
-
- procedure Check_Infinite_Loop_Warning (Loop_Statement : Node_Id);
- -- 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 Warn_On_Known_Condition (C : Node_Id);
- -- 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:
- --
- -- 1. Original expression comes from source. We don't want to generate
- -- warnings for internally generated conditionals.
- --
- -- 2. As noted above, the expression is a relational or membership
- -- test, we don't want to generate warnings for boolean variables
- -- since this is typical of conditional compilation in Ada.
- --
- -- 3. The expression appears in a statement, rather than a declaration.
- -- In practice, most occurrences in declarations are legitimate
- -- conditionalizations, but occurrences in statements are often
- -- errors for which the warning is useful.
- --
- -- 4. The expression does not occur within an instantiation. A non-
- -- static expression in a generic may become constant because of
- -- the attributes of the actuals, and we do not want to warn on
- -- these legitimate constant foldings.
- --
- -- If all these conditions are met, the warning is issued noting that
- -- the result of the test is always false or always true as appropriate.
-
- function Warn_On_Modified_As_Out_Parameter (E : Entity_Id) return Boolean;
- -- Returns True if we should activate warnings for entity E being modified
- -- 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_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
- -- for the indexed component case, or one of the bounds in the slice case.
- -- If Name is an unconstrained parameter of a standard string type, and
- -- the index is of the form of a literal or Name'Length [- literal], then
- -- a warning is generated that the subscripting operation is possibly
- -- incorrectly assuming a lower bound of 1.
-
- procedure Warn_On_Unassigned_Out_Parameter
- (Return_Node : Node_Id;
- Scope_Id : Entity_Id);
- -- Called when processing a return statement given by Return_Node. Scope_Id
- -- is the Entity_Id for the procedure in which the return statement lives.
- -- A check is made for the case of a procedure with out parameters that
- -- have not yet been assigned, and appropriate warnings are given.
-
- procedure Warn_On_Useless_Assignment
- (Ent : Entity_Id;
- N : Node_Id := Empty);
- -- Called to check if we have a case of a useless assignment to the given
- -- entity Ent, as indicated by a non-empty Last_Assignment field. This call
- -- should only be made if at least one of the flags Warn_On_Modified_Unread
- -- or Warn_On_All_Unread_Out_Parameters is True, and if Ent is in the
- -- extended main source unit. N is Empty for the end of block call
- -- (warning message says value unreferenced), or the it is the node for
- -- an overwriting assignment (warning message points to this assignment).
-
- procedure Warn_On_Useless_Assignments (E : Entity_Id);
- pragma Inline (Warn_On_Useless_Assignments);
- -- Called at the end of a block or subprogram. Scans the entities of the
- -- block or subprogram to see if there are any variables for which useless
- -- assignments were made (assignments whose values were never read).
-
-end Sem_Warn;