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-- Semantic analysis.
-- Copyright (C) 2002, 2003, 2004, 2005 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 Vhdl.Nodes; use Vhdl.Nodes;
package Vhdl.Sem_Decls is
-- Analyze an interface chain.
procedure Sem_Interface_Chain (Interface_Chain: Iir;
Interface_Kind : Interface_Kind_Type);
-- Analyze declaration DECL.
-- This is a sub-procedure of Sem_Declaration_Chain used only for
-- PSL verification units.
--
-- PREV_DECL is the previous one (used for declaration like
-- signal a, b : mytype; ) to get type and default value from the
-- previous declaration.
-- IS_GLOBAL must be true when the declaration can be used by an external
-- file (so for package and entities).
-- ATTR_SPEC_CHAIN is the chain of attribute specifications, used to
-- handle the 'others' case.
procedure Sem_Declaration (Decl : in out Iir;
Prev_Decl : in out Iir;
Is_Global : Boolean;
Attr_Spec_Chain : in out Iir);
-- Analyze declarations of PARENT.
procedure Sem_Declaration_Chain (Parent : Iir);
-- Check all declarations of DECLS_PARENT are complete
-- This checks subprograms, deferred constants, incomplete types and
-- protected types.
--
-- DECL is the declaration that contains the declaration_list DECLS_PARENT.
-- (location of errors).
-- DECL is different from DECLS_PARENT for package bodies and protected
-- type bodies.
--
-- Also, report unused declarations if DECL = DECLS_PARENT.
-- As a consequence, Check_Full_Declaration must be called after analyze
-- of statements, if any.
procedure Check_Full_Declaration (Decls_Parent : Iir; Decl: Iir);
procedure Sem_Iterator (Iterator : Iir_Iterator_Declaration;
Staticness : Iir_Staticness);
-- Extract from NAME the named entity whose profile matches SIG. If NAME
-- is an overload list, it is destroyed.
function Sem_Signature (Name : Iir; Sig : Iir_Signature) return Iir;
-- If the type of DECL is unconstrained, create a contrained subtype
-- either locally or globally static (according to VALUE).
-- This is to apply rules of LRM93 3.2.1.1 Index constraints and
-- discrete ranges.
procedure Sem_Object_Type_From_Value (Decl : Iir; Value : Iir);
-- Mark SUBPRG as used. If SUBPRG is an instance, its generic is also
-- marked.
procedure Mark_Subprogram_Used (Subprg : Iir);
-- The attribute signals ('stable, 'quiet and 'transaction) are
-- implicitely declared.
-- Note: guard signals are also implicitly declared but with a guard
-- expression, which is at a known location.
-- Since these signals need resources and are not easily located (can be
-- nearly in every expression), it is useful to add a node into a
-- declaration list to declare them.
-- However, only a few declaration_list can declare signals. These
-- declarations lists must register and unregister themselves with
-- push_declarative_region_with_signals and
-- pop_declarative_region_with_signals.
type Implicit_Signal_Declaration_Type is private;
procedure Push_Signals_Declarative_Part
(Cell: out Implicit_Signal_Declaration_Type; Decls_Parent : Iir);
procedure Pop_Signals_Declarative_Part
(Cell: in Implicit_Signal_Declaration_Type);
-- Declare an implicit signal. This is called from sem_names when a
-- signal attribute is analyzed.
procedure Add_Declaration_For_Implicit_Signal (Sig : Iir);
-- Append declaration SIG (for an anonymous signal) to the current
-- declarative part.
procedure Add_Implicit_Declaration (Sig : Iir);
private
type Implicit_Signal_Declaration_Type is record
-- Declaration or statement than will contain implicit declarations.
Decls_Parent : Iir;
-- Set to the signal_attribute_declaration when created (ie when the
-- first attribute signal is added).
Implicit_Decl : Iir;
-- Last attribute signal inserted in the current Implicit_Decl.
Last_Attribute_Signal : Iir;
-- If True, declarations of DECLS_PARENT have already been analyzed.
-- So implicit declarations are appended to the parent, and the last
-- declaration is LAST_DECL. This is the usual case when attribute
-- signals are used in statements.
-- If False, declarations are being analyzed. Implicit declarations
-- are appended to IMPLICIT_DECL/LAST_ATTRIBUTE_SIGNAL and will be
-- inserted before the current declaration. This can happen if a
-- attribute signal is used in a declaration, the attribute signal
-- must be declared before it is used.
Decls_Analyzed : Boolean;
-- Last declaration in the region. If an implicit_decl is createed, it
-- will be appended to LAST_DECL.
Last_Decl : Iir;
end record;
end Vhdl.Sem_Decls;
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