-- --
-- S p e c --
-- --
--- Copyright (C) 1992-2011, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2012, 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- --
with Alloc;
with Einfo; use Einfo;
-with Opt; use Opt;
with Table;
with Types; use Types;
package Sem is
- New_Nodes_OK : Int := 1;
- -- Temporary flag for use in checking out HLO. Set non-zero if it is
- -- OK to generate new nodes.
-
-----------------------------
-- Semantic Analysis Flags --
-----------------------------
-- frozen from start, because the tree on which they depend will not
-- be available at the freeze point.
+ In_Assertion_Expr : Nat := 0;
+ -- This is set non-zero if we are within the expression of an assertion
+ -- pragma or aspect. It is a counter which is incremented at the start
+ -- of expanding such an expression, and decremented on completion of
+ -- expanding that expression. Probably a boolean would be good enough,
+ -- since we think that such expressions cannot nest, but that might not
+ -- be true in the future (e.g. if let expressions are added to Ada) so
+ -- we prepare for that future possibility by making it a counter.
+
In_Inlined_Body : Boolean := False;
-- Switch to indicate that we are analyzing and resolving an inlined body.
-- Type checking is disabled in this context, because types are known to be
-- Scope based suppress checks for the predefined checks (from initial
-- command line arguments, or from Suppress pragmas not including an entity
- -- entity name) are recorded in the Sem.Suppress variable, and all that is
- -- necessary is to save the state of this variable on scope entry, and
- -- restore it on scope exit. This mechanism allows for fast checking of
- -- the scope suppress state without needing complex data structures.
+ -- name) are recorded in the Sem.Scope_Suppress variable, and all that
+ -- is necessary is to save the state of this variable on scope entry, and
+ -- restore it on scope exit. This mechanism allows for fast checking of the
+ -- scope suppress state without needing complex data structures.
-- Entity based checks, from Suppress/Unsuppress pragmas giving an
-- Entity_Id and scope based checks for non-predefined checks (introduced
-- that are applicable to all entities. A similar search is needed for any
-- non-predefined check even if no specific entity is involved.
- Scope_Suppress : Suppress_Array := Suppress_Options;
- -- This array contains the current scope based settings of the suppress
- -- switches. It is initialized from the options as shown, and then modified
- -- by pragma Suppress. On entry to each scope, the current setting is saved
- -- the scope stack, and then restored on exit from the scope. This record
- -- may be rapidly checked to determine the current status of a check if
- -- no specific entity is involved or if the specific entity involved is
- -- one for which no specific Suppress/Unsuppress pragma has been set (as
- -- indicated by the Checks_May_Be_Suppressed flag being set).
+ Scope_Suppress : Suppress_Record;
+ -- This variable contains the current scope based settings of the suppress
+ -- switches. It is initialized from Suppress_Options in Gnat1drv, and then
+ -- modified by pragma Suppress. On entry to each scope, the current setting
+ -- is saved on the scope stack, and then restored on exit from the scope.
+ -- This record may be rapidly checked to determine the current status of
+ -- a check if no specific entity is involved or if the specific entity
+ -- involved is one for which no specific Suppress/Unsuppress pragma has
+ -- been set (as indicated by the Checks_May_Be_Suppressed flag being set).
-- This scheme is a little complex, but serves the purpose of enabling
-- a very rapid check in the common case where no entity specific pragma
-- Pointer to name of last subprogram body in this scope. Used for
-- testing proper alpha ordering of subprogram bodies in scope.
- Save_Scope_Suppress : Suppress_Array;
+ Save_Scope_Suppress : Suppress_Record;
-- Save contents of Scope_Suppress on entry
Save_Local_Suppress_Stack_Top : Suppress_Stack_Entry_Ptr;
-- This function returns True if an explicit pragma Suppress for check C
-- is present in the package defining E.
- function Is_Check_Suppressed (E : Entity_Id; C : Check_Id) return Boolean;
- -- This function is called if Checks_May_Be_Suppressed (E) is True to
- -- determine whether check C is suppressed either on the entity E or
- -- as the result of a scope suppress pragma. If Checks_May_Be_Suppressed
- -- is False, then the status of the check can be determined simply by
- -- examining Scope_Checks (C), so this routine is not called in that case.
+ procedure Preanalyze (N : Node_Id);
+ -- Performs a pre-analysis of node N. During pre-analysis no expansion is
+ -- carried out for N or its children. For more info on pre-analysis read
+ -- the spec of Sem.
generic
with procedure Action (Item : Node_Id);
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