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|
-- Semantic analysis.
-- Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
--
-- This program 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 of the License, or
-- (at your option) any later version.
--
-- This program 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 this program. If not, see <gnu.org/licenses>.
with Flags; use Flags;
with Name_Table;
with Libraries;
with Vhdl.Evaluation; use Vhdl.Evaluation;
with Vhdl.Utils; use Vhdl.Utils;
with Errorout; use Errorout;
with Vhdl.Errors; use Vhdl.Errors;
with Vhdl.Std_Package; use Vhdl.Std_Package;
with Types; use Types;
with Vhdl.Nodes_Utils; use Vhdl.Nodes_Utils;
with Std_Names;
with Vhdl.Sem;
with Vhdl.Sem_Lib; use Vhdl.Sem_Lib;
with Vhdl.Sem_Scopes; use Vhdl.Sem_Scopes;
with Vhdl.Sem_Expr; use Vhdl.Sem_Expr;
with Vhdl.Sem_Stmts; use Vhdl.Sem_Stmts;
with Vhdl.Sem_Decls; use Vhdl.Sem_Decls;
with Vhdl.Sem_Assocs; use Vhdl.Sem_Assocs;
with Vhdl.Sem_Specs;
with Vhdl.Sem_Types;
with Vhdl.Sem_Psl;
with Vhdl.Xrefs; use Vhdl.Xrefs;
package body Vhdl.Sem_Names is
-- Finish the analyze of NAME using RES as named entity.
-- This is called when the analyze is finished and an uniq
-- interpretation has been determined (RES).
--
-- Error messages are emitted here.
function Finish_Sem_Name (Name : Iir; Res : Iir) return Iir;
-- Return the fully analyzed name of NAME.
function Name_To_Analyzed_Name (Name : Iir) return Iir;
procedure Error_Overload (Expr: Iir) is
begin
if Is_Error (Expr) then
-- Avoid error storm.
return;
end if;
Error_Msg_Sem (+Expr, "can't resolve overload for %n", +Expr);
end Error_Overload;
procedure Disp_Overload_List (List : Iir_List; Loc : Iir)
is
El : Iir;
It : List_Iterator;
begin
Error_Msg_Sem (+Loc, "possible interpretations are:");
It := List_Iterate (List);
while Is_Valid (It) loop
El := Get_Element (It);
case Get_Kind (El) is
when Iir_Kind_Function_Declaration
| Iir_Kind_Procedure_Declaration =>
Error_Msg_Sem (+El, Disp_Subprg (El));
when Iir_Kind_Function_Call =>
El := Get_Implementation (El);
Error_Msg_Sem (+El, Disp_Subprg (El));
when others =>
Error_Msg_Sem (+El, "%n", +El);
end case;
Next (It);
end loop;
end Disp_Overload_List;
-- Create an overload list.
-- must be destroyed with free_iir.
function Get_Overload_List return Iir_Overload_List
is
Res : Iir;
begin
Res := Create_Iir (Iir_Kind_Overload_List);
return Res;
end Get_Overload_List;
function Create_Overload_List (List : Iir_List) return Iir_Overload_List
is
Res : Iir_Overload_List;
begin
Res := Get_Overload_List;
Set_Overload_List (Res, List);
return Res;
end Create_Overload_List;
procedure Free_Overload_List (N : in out Iir_Overload_List)
is
List : Iir_List;
begin
List := Get_Overload_List (N);
Destroy_Iir_List (List);
Free_Iir (N);
N := Null_Iir;
end Free_Overload_List;
function Simplify_Overload_List (List : Iir_List) return Iir
is
Res : Iir;
L1 : Iir_List;
begin
case Get_Nbr_Elements (List) is
when 0 =>
L1 := List;
Destroy_Iir_List (L1);
return Null_Iir;
when 1 =>
L1 := List;
Res := Get_First_Element (List);
Destroy_Iir_List (L1);
return Res;
when others =>
return Create_Overload_List (List);
end case;
end Simplify_Overload_List;
-- Return true if AN_IIR is an overload list.
function Is_Overload_List (An_Iir: Iir) return Boolean is
begin
return Get_Kind (An_Iir) = Iir_Kind_Overload_List;
end Is_Overload_List;
function Is_Defined_Type (Atype : Iir) return Boolean is
begin
return Atype /= Null_Iir
and then not Kind_In (Get_Kind (Atype),
Iir_Kind_Overload_List,
Iir_Kind_Wildcard_Type_Definition);
end Is_Defined_Type;
-- From the list LIST of function or enumeration literal, extract the
-- list of (return) types.
-- If there is only one type, return it.
-- If there is no types, return NULL.
-- Otherwise, return the list as an overload list.
function Create_List_Of_Types (List : Iir_List)
return Iir
is
Res_List : Iir_List;
Decl : Iir;
It : List_Iterator;
begin
-- Create the list of possible return types.
Res_List := Create_Iir_List;
It := List_Iterate (List);
while Is_Valid (It) loop
Decl := Get_Element (It);
case Get_Kind (Decl) is
when Iir_Kind_Function_Declaration =>
Add_Element (Res_List, Get_Return_Type (Decl));
when Iir_Kind_Enumeration_Literal
| Iir_Kind_Function_Call
| Iir_Kind_Indexed_Name
| Iir_Kind_Slice_Name
| Iir_Kind_Selected_Element
| Iir_Kind_Dereference =>
Add_Element (Res_List, Get_Type (Decl));
when others =>
Error_Kind ("create_list_of_types", Decl);
end case;
Next (It);
end loop;
return Simplify_Overload_List (Res_List);
end Create_List_Of_Types;
procedure Add_Result (Res : in out Iir; Decl : Iir)
is
Nres : Iir;
Nres_List : Iir_List;
begin
if Decl = Null_Iir then
return;
end if;
if Res = Null_Iir then
Res := Decl;
elsif Is_Overload_List (Res) then
Append_Element (Get_Overload_List (Res), Decl);
else
Nres_List := Create_Iir_List;
Nres := Create_Overload_List (Nres_List);
Append_Element (Nres_List, Res);
Append_Element (Nres_List, Decl);
Res := Nres;
end if;
end Add_Result;
-- Extract from overload list RES the function call without implicit
-- conversion. Return Null_Iir if there is no function call, or if there
-- is an expressions that isn't a function call, or if there is more than
-- one function call without implicit conversion.
-- Cf Sem_Expr.Get_Non_Implicit_Subprogram
function Extract_Call_Without_Implicit_Conversion (Res : Iir) return Iir
is
pragma Assert (Is_Overload_List (Res));
List : constant Iir_List := Get_Overload_List (Res);
It : List_Iterator;
Call : Iir;
El : Iir;
Imp : Iir;
Inter : Iir;
begin
Call := Null_Iir;
It := List_Iterate (List);
while Is_Valid (It) loop
El := Get_Element (It);
if Get_Kind (El) = Iir_Kind_Function_Call then
Imp := Get_Implementation (El);
Inter := Get_Interface_Declaration_Chain (Imp);
if Get_Type (Inter) = Universal_Integer_Type_Definition
or else Get_Type (Inter) = Universal_Real_Type_Definition
then
-- The type of the first interface is a universal type. So,
-- there were no implicit conversions. Once there is an
-- implicit conversion, the only way to 'convert' to a
-- universal type is through T'Pos, which has to be resolved.
-- Note: there are no interface of convertible types.
-- GHDL: this is not proven...
if Call /= Null_Iir then
-- More than one call without implicit conversion.
return Null_Iir;
else
Call := El;
end if;
end if;
else
return Null_Iir;
end if;
Next (It);
end loop;
return Call;
end Extract_Call_Without_Implicit_Conversion;
-- Move elements of result list LIST to result list RES.
-- Destroy LIST if necessary.
procedure Add_Result_List (Res : in out Iir; List : Iir);
pragma Unreferenced (Add_Result_List);
procedure Add_Result_List (Res : in out Iir; List : Iir)
is
El : Iir;
List_List : Iir_List;
Res_List : Iir_List;
It : List_Iterator;
begin
if Res = Null_Iir then
Res := List;
elsif List = Null_Iir then
null;
elsif not Is_Overload_List (List) then
Add_Result (Res, List);
else
if not Is_Overload_List (Res) then
El := Res;
Res := Get_Overload_List;
Append_Element (Get_Overload_List (Res), El);
end if;
List_List := Get_Overload_List (List);
Res_List := Get_Overload_List (Res);
It := List_Iterate (List_List);
while Is_Valid (It) loop
Append_Element (Res_List, Get_Element (It));
Next (It);
end loop;
Free_Iir (List);
end if;
end Add_Result_List;
-- Free interpretations of LIST except KEEP (which can be Null_Iir to free
-- the whole list).
procedure Sem_Name_Free_Result (List : Iir; Keep : Iir)
is
procedure Sem_Name_Free (El : Iir) is
begin
case Get_Kind (El) is
when Iir_Kind_Function_Call
| Iir_Kind_Indexed_Name
| Iir_Kind_Selected_Element =>
Sem_Name_Free (Get_Prefix (El));
Free_Iir (El);
when Iir_Kind_Attribute_Name =>
Free_Iir (El);
when Iir_Kind_Function_Declaration
| Iir_Kind_Procedure_Declaration
| Iir_Kind_Enumeration_Literal =>
null;
when Iir_Kind_Interface_Function_Declaration
| Iir_Kind_Interface_Procedure_Declaration =>
null;
when Iir_Kinds_Denoting_Name =>
null;
when others =>
Error_Kind ("sem_name_free", El);
end case;
end Sem_Name_Free;
El : Iir;
List_List : Iir_List;
It : List_Iterator;
begin
if List = Null_Iir then
return;
elsif not Is_Overload_List (List) then
if List /= Keep then
Sem_Name_Free (List);
end if;
else
List_List := Get_Overload_List (List);
It := List_Iterate (List_List);
while Is_Valid (It) loop
El := Get_Element (It);
if El /= Keep then
Sem_Name_Free (El);
end if;
Next (It);
end loop;
Free_Iir (List);
end if;
end Sem_Name_Free_Result;
procedure Free_Parenthesis_Name (Name : Iir; Res : Iir)
is
Chain, Next_Chain : Iir;
begin
pragma Assert (Get_Kind (Res) /= Iir_Kind_Function_Call);
Chain := Get_Association_Chain (Name);
while Chain /= Null_Iir loop
Next_Chain := Get_Chain (Chain);
Free_Iir (Chain);
Chain := Next_Chain;
end loop;
Free_Iir (Name);
end Free_Parenthesis_Name;
-- Find all named declaration whose identifier is ID in DECL_LIST and
-- return it.
-- The result can be NULL (if no such declaration exist),
-- a declaration, or an overload_list containing all declarations.
function Find_Declarations_In_List
(Decl: Iir; Name : Iir_Selected_Name; Keep_Alias : Boolean)
return Iir
is
Res: Iir := Null_Iir;
-- If indentifier of DECL is ID, then add DECL in the result.
procedure Handle_Decl (Decl : Iir; Id : Name_Id) is
begin
-- Use_clauses may appear in a declaration list.
case Get_Kind (Decl) is
when Iir_Kind_Use_Clause
| Iir_Kind_Anonymous_Type_Declaration =>
return;
when Iir_Kind_Non_Object_Alias_Declaration =>
if Get_Identifier (Decl) = Id then
if Keep_Alias then
Add_Result (Res, Decl);
else
Add_Result (Res, Get_Named_Entity (Get_Name (Decl)));
end if;
end if;
when others =>
-- Consider only visible declarations (case of an implicit
-- declaration that is overriden by explicit one).
if Get_Identifier (Decl) = Id and Get_Visible_Flag (Decl) then
Add_Result (Res, Decl);
end if;
end case;
end Handle_Decl;
procedure Iterator_Decl is new Sem_Scopes.Iterator_Decl
(Arg_Type => Name_Id, Handle_Decl => Handle_Decl);
--procedure Iterator_Decl_List is new Sem_Scopes.Iterator_Decl_List
-- (Arg_Type => Name_Id, Handle_Decl => Iterator_Decl);
procedure Iterator_Decl_Chain is new Sem_Scopes.Iterator_Decl_Chain
(Arg_Type => Name_Id, Handle_Decl => Iterator_Decl);
Id : constant Name_Id := Get_Identifier (Name);
begin
case Get_Kind (Decl) is
when Iir_Kind_Function_Declaration
| Iir_Kind_Procedure_Declaration =>
Iterator_Decl_Chain (Get_Interface_Declaration_Chain (Decl), Id);
when Iir_Kind_Entity_Declaration =>
Iterator_Decl_Chain (Get_Generic_Chain (Decl), Id);
Iterator_Decl_Chain (Get_Port_Chain (Decl), Id);
when Iir_Kind_Architecture_Body =>
null;
when Iir_Kind_If_Generate_Statement
| Iir_Kind_For_Generate_Statement =>
null;
when Iir_Kind_Package_Declaration =>
declare
Header : constant Iir := Get_Package_Header (Decl);
begin
if Is_Valid (Header)
and then Get_Is_Within_Flag (Decl)
then
Iterator_Decl_Chain (Get_Generic_Chain (Header), Id);
end if;
end;
when Iir_Kind_Package_Instantiation_Declaration
| Iir_Kind_Interface_Package_Declaration =>
-- Generics are not visible in selected name.
null;
-- Iterator_Decl_Chain (Get_Generic_Chain (Decl), Id);
when Iir_Kind_Block_Statement =>
declare
Header : constant Iir := Get_Block_Header (Decl);
begin
if Header /= Null_Iir then
Iterator_Decl_Chain (Get_Generic_Chain (Header), Id);
Iterator_Decl_Chain (Get_Port_Chain (Header), Id);
end if;
end;
when Iir_Kind_For_Loop_Statement =>
Handle_Decl (Get_Parameter_Specification (Decl), Id);
when Iir_Kind_Process_Statement
| Iir_Kind_Sensitized_Process_Statement =>
null;
when others =>
Error_Kind ("find_declarations_in_list", Decl);
end case;
case Get_Kind (Decl) is
when Iir_Kind_Function_Declaration
| Iir_Kind_Procedure_Declaration =>
declare
Decl_Body : constant Iir := Get_Subprogram_Body (Decl);
begin
Iterator_Decl_Chain
(Get_Declaration_Chain (Decl_Body), Id);
Iterator_Decl_Chain
(Get_Sequential_Statement_Chain (Decl_Body), Id);
end;
when Iir_Kind_Architecture_Body
| Iir_Kind_Entity_Declaration
| Iir_Kind_Block_Statement =>
Iterator_Decl_Chain (Get_Declaration_Chain (Decl), Id);
Iterator_Decl_Chain (Get_Concurrent_Statement_Chain (Decl), Id);
when Iir_Kind_For_Generate_Statement =>
declare
Bod : constant Iir := Get_Generate_Statement_Body (Decl);
begin
Iterator_Decl_Chain (Get_Declaration_Chain (Bod), Id);
Iterator_Decl_Chain (Get_Concurrent_Statement_Chain (Bod), Id);
end;
when Iir_Kind_If_Generate_Statement =>
declare
Clause : Iir;
Bod : Iir;
begin
-- Look only in the current generate_statement_body
Clause := Decl;
while Clause /= Null_Iir loop
Bod := Get_Generate_Statement_Body (Clause);
if Get_Is_Within_Flag (Bod) then
Iterator_Decl_Chain
(Get_Declaration_Chain (Bod), Id);
Iterator_Decl_Chain
(Get_Concurrent_Statement_Chain (Bod), Id);
exit;
end if;
Clause := Get_Generate_Else_Clause (Clause);
end loop;
end;
when Iir_Kind_Package_Declaration
| Iir_Kind_Package_Instantiation_Declaration
| Iir_Kind_Interface_Package_Declaration =>
Iterator_Decl_Chain (Get_Declaration_Chain (Decl), Id);
when Iir_Kind_Process_Statement
| Iir_Kind_Sensitized_Process_Statement =>
Iterator_Decl_Chain (Get_Declaration_Chain (Decl), Id);
Iterator_Decl_Chain (Get_Sequential_Statement_Chain (Decl), Id);
when Iir_Kind_For_Loop_Statement =>
null;
when others =>
Error_Kind ("find_declarations_in_list", Decl);
end case;
--if Res = Null_Iir then
-- Error_Msg_Sem ("""" & Name_Table.Image (Id) & """ not defined in "
-- & Disp_Node (Decl), Name);
--end if;
return Res;
end Find_Declarations_In_List;
-- Create an implicit_dereference node if PREFIX is of type access.
-- Return PREFIX otherwise.
-- PARENT is used if an implicit dereference node is created, to copy
-- location from.
function Insert_Implicit_Dereference (Prefix : Iir; Parent : Iir)
return Iir
is
Prefix_Type : Iir;
Res : Iir_Implicit_Dereference;
begin
Prefix_Type := Get_Type (Prefix);
case Get_Kind (Prefix_Type) is
when Iir_Kind_Access_Type_Definition
| Iir_Kind_Access_Subtype_Definition =>
null;
when others =>
return Prefix;
end case;
Check_Read (Prefix);
Res := Create_Iir (Iir_Kind_Implicit_Dereference);
Location_Copy (Res, Parent);
Set_Type (Res, Get_Designated_Type (Prefix_Type));
Set_Prefix (Res, Prefix);
Set_Base_Name (Res, Res);
Set_Expr_Staticness (Res, None);
return Res;
end Insert_Implicit_Dereference;
-- If PREFIX is a function specification that cannot be converted to a
-- function call (because of lack of association), return FALSE.
function Maybe_Function_Call (Prefix : Iir) return Boolean
is
Inter : Iir;
begin
if Get_Kind (Prefix) /= Iir_Kind_Function_Declaration then
return True;
end if;
Inter := Get_Interface_Declaration_Chain (Prefix);
while Inter /= Null_Iir loop
if Get_Default_Value (Inter) = Null_Iir then
return False;
end if;
Inter := Get_Chain (Inter);
end loop;
return True;
end Maybe_Function_Call;
procedure Name_To_Method_Object (Call : Iir; Name : Iir)
is
Prefix : Iir;
Obj : Iir;
begin
if Get_Kind (Name) /= Iir_Kind_Selected_Name then
return;
end if;
Prefix := Get_Prefix (Name);
Obj := Get_Named_Entity (Prefix);
if Obj /= Null_Iir
and then Kind_In (Obj, Iir_Kind_Variable_Declaration,
Iir_Kind_Interface_Variable_Declaration)
and then Get_Type (Obj) /= Null_Iir
then
if Get_Kind (Get_Type (Obj)) /= Iir_Kind_Protected_Type_Declaration
then
Error_Msg_Sem
(+Prefix, "type of the prefix should be a protected type");
return;
end if;
Set_Method_Object (Call, Obj);
Set_Use_Flag (Obj, True);
end if;
end Name_To_Method_Object;
-- NAME is the name of the function (and not the parenthesis name)
function Sem_As_Function_Call (Name : Iir; Spec : Iir; Assoc_Chain : Iir)
return Iir_Function_Call
is
Call : Iir_Function_Call;
begin
-- Check.
pragma Assert (Get_Kind (Name) in Iir_Kinds_Denoting_Name);
Call := Create_Iir (Iir_Kind_Function_Call);
Location_Copy (Call, Name);
if Get_Kind (Name) = Iir_Kind_Parenthesis_Name then
Set_Prefix (Call, Get_Prefix (Name));
else
Set_Prefix (Call, Name);
end if;
Name_To_Method_Object (Call, Name);
Set_Implementation (Call, Spec);
Set_Parameter_Association_Chain (Call, Assoc_Chain);
Set_Type (Call, Get_Return_Type (Spec));
Set_Base_Name (Call, Call);
return Call;
end Sem_As_Function_Call;
-- If SPEC is a function specification, then return a function call,
-- else return SPEC.
function Maybe_Insert_Function_Call (Name : Iir; Spec : Iir) return Iir
is
begin
if Get_Kind (Spec) = Iir_Kind_Function_Declaration then
return Sem_As_Function_Call (Name, Spec, Null_Iir);
else
return Spec;
end if;
end Maybe_Insert_Function_Call;
-- If PTR_TYPE is not NULL_IIR, then return an implciti dereference to
-- PREFIX, else return PREFIX.
function Maybe_Insert_Dereference (Prefix : Iir; Ptr_Type : Iir) return Iir
is
Id : Iir;
begin
if Ptr_Type /= Null_Iir then
Id := Create_Iir (Iir_Kind_Implicit_Dereference);
Location_Copy (Id, Prefix);
Set_Type (Id, Get_Designated_Type (Ptr_Type));
Set_Prefix (Id, Prefix);
Set_Base_Name (Id, Id);
return Id;
else
return Prefix;
end if;
end Maybe_Insert_Dereference;
procedure Finish_Sem_Indexed_Name (Expr : Iir)
is
Prefix : constant Iir := Get_Prefix (Expr);
Prefix_Type : constant Iir := Get_Type (Prefix);
Index_List : constant Iir_Flist := Get_Index_List (Expr);
Index_Subtype : Iir;
Index : Iir;
Expr_Staticness : Iir_Staticness;
begin
Expr_Staticness := Locally;
-- LRM93 6.4: there must be one such expression for each index
-- position of the array and each expression must be of the
-- type of the corresponding index.
-- Loop on the indexes.
for I in Flist_First .. Flist_Last (Index_List) loop
Index := Get_Nth_Element (Index_List, I);
Index_Subtype := Get_Index_Type (Prefix_Type, I);
-- The index_subtype can be an unconstrained index type.
Index := Check_Is_Expression (Index, Index);
if Index /= Null_Iir then
Index := Sem_Expression (Index, Get_Base_Type (Index_Subtype));
end if;
if Index /= Null_Iir then
Check_Read (Index);
if Get_Expr_Staticness (Index) = Locally
and then Get_Type_Staticness (Index_Subtype) = Locally
then
Index := Eval_Expr_Check (Index, Index_Subtype);
end if;
Set_Nth_Element (Index_List, I, Index);
Expr_Staticness := Min (Expr_Staticness,
Get_Expr_Staticness (Index));
else
Expr_Staticness := None;
end if;
end loop;
Set_Type (Expr, Get_Element_Subtype (Prefix_Type));
-- LRM93 6.1
-- a name is said to be a static name iff:
-- The name is an indexed name whose prefix is a static name
-- and every expression that appears as part of the name is a
-- static expression.
--
-- a name is said to be a locally static name iif:
-- The name is an indexed name whose prefix is a locally
-- static name and every expression that appears as part
-- of the name is a locally static expression.
Set_Name_Staticness
(Expr, Min (Expr_Staticness, Get_Name_Staticness (Prefix)));
-- An indexed name cannot be locally static.
if Flags.Vhdl_Std < Vhdl_08 then
Expr_Staticness := Min (Globally, Expr_Staticness);
end if;
Set_Expr_Staticness
(Expr, Min (Expr_Staticness, Get_Expr_Staticness (Prefix)));
Set_Base_Name (Expr, Get_Base_Name (Prefix));
end Finish_Sem_Indexed_Name;
procedure Finish_Sem_Dereference (Res : Iir) is
begin
Set_Base_Name (Res, Res);
Check_Read (Get_Prefix (Res));
Set_Expr_Staticness (Res, None);
Set_Name_Staticness (Res, None);
end Finish_Sem_Dereference;
procedure Finish_Sem_Slice_Name (Name : Iir_Slice_Name)
is
-- The prefix of the slice
Prefix : constant Iir := Get_Prefix (Name);
Prefix_Type : constant Iir := Get_Type (Prefix);
Prefix_Base_Type : Iir;
Prefix_Bt : constant Iir := Get_Base_Type (Prefix_Type);
Index_List: Iir_Flist;
Index_Type: Iir;
Suffix: Iir;
Slice_Type : Iir;
Expr_Type : Iir;
Staticness : Iir_Staticness;
Prefix_Rng : Iir;
Suffix_Rng : Iir;
begin
Set_Base_Name (Name, Get_Base_Name (Prefix));
-- LRM93 6.5: the prefix of an indexed name must be appropriate
-- for an array type.
if Get_Kind (Prefix_Bt) /= Iir_Kind_Array_Type_Definition then
Error_Msg_Sem (+Name, "slice can only be applied to an array");
return;
end if;
-- LRM93 6.5:
-- The prefix of a slice must be appropriate for a
-- one-dimensionnal array object.
Index_List := Get_Index_Subtype_List (Prefix_Type);
if Get_Nbr_Elements (Index_List) /= 1 then
Error_Msg_Sem
(+Name, "slice prefix must be an one-dimensional array");
return;
end if;
Index_Type := Get_Index_Type (Index_List, 0);
Prefix_Rng := Eval_Static_Range (Index_Type);
-- LRM93 6.5
-- It is an error if either the bounds of the discrete range does not
-- belong to the index range of the prefixing array, *unless* the slice
-- is a null slice.
--
-- LRM93 6.5
-- The slice is a null slice if the discrete range is a null range.
-- LRM93 6.5:
-- The bounds of the discrete range [...] must be of the
-- type of the index of the array.
Suffix := Get_Suffix (Name);
Suffix := Sem_Discrete_Range (Suffix, Index_Type, False);
if Suffix = Null_Iir then
return;
end if;
case Get_Kind (Suffix) is
when Iir_Kind_Simple_Name
| Iir_Kind_Selected_Name =>
Staticness := Get_Type_Staticness (Get_Type (Suffix));
Suffix_Rng := Get_Range_Constraint (Get_Type (Suffix));
when Iir_Kinds_Scalar_Subtype_Definition =>
Staticness := Get_Type_Staticness (Suffix);
Suffix_Rng := Get_Range_Constraint (Suffix);
when Iir_Kind_Range_Expression
| Iir_Kind_Range_Array_Attribute
| Iir_Kind_Reverse_Range_Array_Attribute =>
Suffix := Eval_Range_If_Static (Suffix);
Suffix_Rng := Suffix;
Staticness := Get_Expr_Staticness (Suffix);
when others =>
Error_Kind ("finish_sem_slice_name", Suffix);
end case;
Set_Suffix (Name, Suffix);
-- LRM93 6.5:
-- It is an error if the direction of the discrete range is not
-- the same as that of the index range of the array denoted
-- by the prefix of the slice name.
-- Check this only if the type is a constrained type.
if Get_Kind (Prefix_Type) = Iir_Kind_Array_Subtype_Definition
and then Get_Index_Constraint_Flag (Prefix_Type)
and then Staticness = Locally
and then Prefix_Rng /= Null_Iir
and then Get_Direction (Suffix_Rng) /= Get_Direction (Prefix_Rng)
then
if False and then Flags.Vhdl_Std = Vhdl_87 then
-- emit a warning for a null slice.
Warning_Msg_Sem (Warnid_Runtime_Error, +Name,
"direction mismatch results in a null slice");
end if;
Error_Msg_Sem (+Name, "direction of the range mismatch");
end if;
-- LRM93 7.4.1
-- A slice is never a locally static expression.
Set_Expr_Staticness
(Name, Min (Min (Staticness, Get_Expr_Staticness (Prefix)), Globally));
Set_Name_Staticness
(Name, Min (Staticness, Get_Name_Staticness (Prefix)));
Expr_Type := Create_Iir (Iir_Kind_Array_Subtype_Definition);
Set_Location (Expr_Type, Get_Location (Suffix));
-- The type of the slice is a subtype of the base type whose
-- range contraint is the slice itself.
case Get_Kind (Suffix) is
when Iir_Kinds_Denoting_Name =>
Slice_Type := Get_Type (Suffix);
when Iir_Kinds_Scalar_Subtype_Definition =>
Slice_Type := Suffix;
when others =>
case Get_Kind (Get_Base_Type (Index_Type)) is
when Iir_Kind_Integer_Type_Definition =>
Slice_Type :=
Create_Iir (Iir_Kind_Integer_Subtype_Definition);
when Iir_Kind_Enumeration_Type_Definition =>
Slice_Type :=
Create_Iir (Iir_Kind_Enumeration_Subtype_Definition);
when others =>
Error_Kind
("sem_expr: slice_name", Get_Base_Type (Index_Type));
end case;
Set_Range_Constraint (Slice_Type, Suffix_Rng);
Set_Is_Ref (Slice_Type, True);
Set_Type_Staticness (Slice_Type, Staticness);
Set_Parent_Type (Slice_Type, Get_Base_Type (Index_Type));
Set_Location (Slice_Type, Get_Location (Suffix));
-- Attach the new index subtype to the array subtype.
Index_List := Create_Iir_Flist (1);
Set_Index_Constraint_List (Expr_Type, Index_List);
Set_Nth_Element (Index_List, 0, Slice_Type);
end case;
Index_List := Create_Iir_Flist (1);
Set_Index_Subtype_List (Expr_Type, Index_List);
Set_Nth_Element (Index_List, 0, Slice_Type);
Prefix_Base_Type := Get_Base_Type (Prefix_Type);
Set_Parent_Type (Expr_Type, Prefix_Base_Type);
Set_Signal_Type_Flag (Expr_Type,
Get_Signal_Type_Flag (Prefix_Base_Type));
Set_Element_Subtype (Expr_Type, Get_Element_Subtype (Prefix_Type));
if Get_Kind (Prefix_Type) = Iir_Kind_Array_Subtype_Definition then
Set_Resolution_Indication
(Expr_Type, Sem_Types.Copy_Resolution_Indication (Prefix_Type));
else
Set_Resolution_Indication (Expr_Type, Null_Iir);
end if;
Set_Type_Staticness
(Expr_Type, Min (Get_Type_Staticness (Prefix_Type),
Get_Type_Staticness (Slice_Type)));
Set_Type (Name, Expr_Type);
Set_Slice_Subtype (Name, Expr_Type);
Set_Index_Constraint_Flag (Expr_Type, True);
Set_Constraint_State (Expr_Type, Fully_Constrained);
if Is_Signal_Object (Prefix) then
Sem_Types.Set_Type_Has_Signal (Expr_Type);
end if;
end Finish_Sem_Slice_Name;
-- PREFIX is the name denoting the function declaration, and its analysis
-- is already finished.
procedure Finish_Sem_Function_Call (Call : Iir; Prefix : Iir)
is
Rtype : Iir;
begin
Set_Prefix (Call, Prefix);
Set_Implementation (Call, Get_Named_Entity (Prefix));
-- LRM08 8.1 Names
-- The name is a simple name or selected name that does NOT denote a
-- function call [...]
--
-- GHDL: so function calls are never static names.
Set_Name_Staticness (Call, None);
-- FIXME: modify sem_subprogram_call to avoid such a type swap.
Rtype := Get_Type (Call);
Set_Type (Call, Null_Iir);
if Sem_Subprogram_Call (Call, Null_Iir) = Null_Iir then
Set_Type (Call, Rtype);
end if;
end Finish_Sem_Function_Call;
function Function_Declaration_To_Call (Name : Iir) return Iir
is
Expr : Iir;
begin
Expr := Get_Named_Entity (Name);
if Maybe_Function_Call (Expr) then
Expr := Sem_As_Function_Call (Name, Expr, Null_Iir);
pragma Assert (Get_Kind (Expr) = Iir_Kind_Function_Call);
Finish_Sem_Function_Call (Expr, Name);
return Expr;
else
Error_Msg_Sem (+Name, "%n requires parameters", +Expr);
Set_Type (Name, Get_Type (Expr));
Set_Expr_Staticness (Name, None);
Set_Named_Entity (Name, Create_Error_Expr (Expr, Get_Type (Expr)));
return Name;
end if;
end Function_Declaration_To_Call;
function Sem_Type_Mark (Name : Iir; Incomplete : Boolean := False)
return Iir
is
Atype : Iir;
Res : Iir;
begin
-- The name must not have been analyzed.
pragma Assert (Get_Type (Name) = Null_Iir);
if Is_Error (Name) then
Set_Type (Name, Name);
return Name;
end if;
-- Analyze the name (if not already done).
Res := Get_Named_Entity (Name);
if Res = Null_Iir then
Sem_Name (Name);
Res := Get_Named_Entity (Name);
end if;
if Res /= Null_Iir and then Is_Overload_List (Res) then
Error_Msg_Sem (+Name, "name does not denote a type mark");
return Create_Error_Type (Name);
end if;
Res := Finish_Sem_Name (Name);
-- LRM87 14.1 Predefined attributes
if Get_Kind (Res) = Iir_Kind_Base_Attribute then
Error_Msg_Sem
(+Name, "'Base attribute cannot be used as a type mark");
end if;
Atype := Name_To_Type_Definition (Res);
if Is_Error (Atype) then
if Get_Kind (Res) in Iir_Kinds_Denoting_Name then
Set_Named_Entity (Res, Atype);
else
return Create_Error_Type (Name);
end if;
elsif not Incomplete then
if Get_Kind (Atype) = Iir_Kind_Incomplete_Type_Definition then
Error_Msg_Sem
(+Name, "invalid use of an incomplete type definition");
Atype := Create_Error_Type (Name);
Set_Named_Entity (Res, Atype);
end if;
end if;
Set_Type (Res, Atype);
return Res;
end Sem_Type_Mark;
-- Return Globally if the prefix of NAME is a globally static name.
function Get_Object_Type_Staticness (Name : Iir) return Iir_Staticness
is
Base : constant Iir := Get_Base_Name (Name);
Parent : Iir;
begin
if Get_Kind (Base) in Iir_Kinds_Dereference then
-- A dereferenced object is never static.
return None;
end if;
Parent := Get_Parent (Base);
loop
case Get_Kind (Parent) is
when Iir_Kind_Entity_Declaration
| Iir_Kind_Architecture_Body
| Iir_Kind_Block_Statement
| Iir_Kind_Block_Header
| Iir_Kind_Component_Declaration
| Iir_Kinds_Process_Statement
| Iir_Kind_Generate_Statement_Body
| Iir_Kind_Design_Unit =>
-- Globally static.
return Globally;
when Iir_Kind_Package_Declaration
| Iir_Kind_Package_Body
| Iir_Kind_Package_Instantiation_Declaration
| Iir_Kind_Protected_Type_Body =>
-- Possibly nested construct.
Parent := Get_Parent (Parent);
when Iir_Kinds_Subprogram_Declaration
| Iir_Kinds_Subprogram_Body
| Iir_Kinds_Interface_Subprogram_Declaration =>
-- Not globally static.
return None;
when others =>
Error_Kind ("get_object_type_staticness", Parent);
end case;
end loop;
end Get_Object_Type_Staticness;
procedure Finish_Sem_Array_Attribute
(Attr_Name : Iir; Attr : Iir; Param : Iir)
is
Parameter : Iir;
Prefix_Type : Iir;
Index_Type : Iir;
Prefix : Iir;
Prefix_Name : Iir;
Staticness : Iir_Staticness;
begin
-- LRM93 14.1
-- Parameter: A locally static expression of type universal_integer, the
-- value of which must not exceed the dimensionality of A. If omitted,
-- it defaults to 1.
if Param = Null_Iir then
Parameter := Null_Iir;
else
Parameter := Sem_Expression
(Param, Universal_Integer_Type_Definition);
if Parameter /= Null_Iir then
if Get_Expr_Staticness (Parameter) /= Locally then
Error_Msg_Sem (+Parameter, "parameter must be locally static");
end if;
else
-- Don't forget there is a parameter, so the attribute cannot
-- be reanalyzed with a default parameter.
Parameter := Error_Mark;
end if;
end if;
-- See Sem_Array_Attribute_Name for comments about the prefix.
Prefix_Name := Get_Prefix (Attr_Name);
if Is_Type_Name (Prefix_Name) /= Null_Iir then
Prefix := Sem_Type_Mark (Prefix_Name);
else
Prefix := Finish_Sem_Name (Prefix_Name, Get_Prefix (Attr));
-- Convert function declaration to call.
if Get_Kind (Prefix) in Iir_Kinds_Denoting_Name
and then
(Get_Kind (Get_Named_Entity (Prefix))
= Iir_Kind_Function_Declaration)
then
Prefix := Function_Declaration_To_Call (Prefix);
end if;
if not Is_Object_Name (Prefix) then
Error_Msg_Sem_Relaxed
(Attr, Warnid_Attribute,
"prefix of array attribute must be an object name");
end if;
end if;
Set_Prefix (Attr, Prefix);
Prefix_Type := Get_Type (Prefix);
if Is_Error (Prefix_Type) then
return;
end if;
declare
Dim : Int64;
Indexes_List : constant Iir_Flist :=
Get_Index_Subtype_List (Prefix_Type);
begin
if Is_Null (Parameter)
or else Get_Expr_Staticness (Parameter) /= Locally
then
Dim := 1;
else
Dim := Get_Value (Parameter);
end if;
if Dim < 1 or else Dim > Int64 (Get_Nbr_Elements (Indexes_List))
then
Error_Msg_Sem (+Attr, "parameter value out of bound");
Dim := 1;
end if;
Index_Type := Get_Index_Type (Indexes_List, Natural (Dim - 1));
end;
case Get_Kind (Attr) is
when Iir_Kind_Left_Array_Attribute
| Iir_Kind_Right_Array_Attribute
| Iir_Kind_High_Array_Attribute
| Iir_Kind_Low_Array_Attribute =>
Set_Type (Attr, Index_Type);
when Iir_Kind_Range_Array_Attribute
| Iir_Kind_Reverse_Range_Array_Attribute =>
Set_Type (Attr, Index_Type);
when Iir_Kind_Length_Array_Attribute =>
Set_Type (Attr, Convertible_Integer_Type_Definition);
when Iir_Kind_Ascending_Array_Attribute =>
Set_Type (Attr, Boolean_Type_Definition);
when others =>
raise Internal_Error;
end case;
pragma Assert (Get_Parameter (Attr) = Null_Iir);
Set_Parameter (Attr, Parameter);
-- If the corresponding type is known, save it so that it is not
-- necessary to extract it from the object.
if Get_Kind (Prefix_Type) = Iir_Kind_Array_Subtype_Definition
and then Get_Constraint_State (Prefix_Type) = Fully_Constrained
then
Set_Index_Subtype (Attr, Index_Type);
end if;
-- LRM08 9.4.2 Locally static primaries
-- g) A predefined attribute that is a function, [other than ... and
-- other than ...], whose prefix is either a locally static subtype
-- or is an object that is of a locally static subtype, and whose
-- actual parameter (if any) is a locally static expression.
--
-- LRM08 9.4.3 Globally static primaries
-- l) A predefined attribute that is a function, [other than ... and
-- other than ...], whose prefix is appropriate for a globally
-- static attribute, and whose actual parameter (if any) is a
-- globally static expression.
--
-- A prefix is appropriate for a globally static attribute if it denotes
-- a signal, a constant, a type or subtype, a globally static function
-- call, a variable that is not of an access type, or a variable of an
-- access type whose designated subtype is fully constrained.
-- LRM93 7.4.1
-- A locally static range is either [...], or a range of the first form
-- whose prefix denotes either a locally static subtype or an object
-- that is of a locally static subtype.
-- LRM93 7.4.2
-- A globally static range is either [...], or a range of the first form
-- whose prefix denotes either a globally static subtype or an object
-- that is of a globally static subtype.
--
-- A globally static subtype is either a globally static scalar subtype,
-- a globally static array subtype, [...]
--
-- A globally static array subtype is a constrained array subtype
-- formed by imposing on an unconstrained array type a globally static
-- index constraint.
Staticness := Get_Type_Staticness (Prefix_Type);
if Is_Object_Name (Prefix) then
Staticness := Iir_Staticness'Max
(Staticness, Get_Object_Type_Staticness (Prefix));
end if;
Set_Expr_Staticness (Attr, Staticness);
end Finish_Sem_Array_Attribute;
procedure Finish_Sem_Scalar_Type_Attribute
(Attr_Name : Iir; Attr : Iir; Param : Iir)
is
Prefix : Iir;
Prefix_Type : Iir;
Prefix_Bt : Iir;
Parameter : Iir;
Param_Type : Iir;
begin
if Param = Null_Iir then
Error_Msg_Sem (+Attr, "%n requires a parameter", +Attr);
return;
end if;
Prefix := Finish_Sem_Name (Get_Prefix (Attr));
Free_Iir (Attr_Name);
Set_Prefix (Attr, Prefix);
Prefix_Type := Get_Type (Prefix);
Prefix_Bt := Get_Base_Type (Prefix_Type);
case Get_Kind (Attr) is
when Iir_Kind_Pos_Attribute =>
-- LRM93 14.1
-- Parameter: An expression whose type is the base type of T.
Parameter := Sem_Expression (Param, Prefix_Bt);
when Iir_Kind_Val_Attribute =>
-- LRM93 14.1
-- Parameter: An expression of any integer type.
Param_Type := Get_Type (Param);
if Is_Overload_List (Param_Type) then
Parameter := Sem_Expression
(Param, Universal_Integer_Type_Definition);
else
if Get_Kind (Get_Base_Type (Param_Type))
/= Iir_Kind_Integer_Type_Definition
then
Error_Msg_Sem (+Attr, "parameter must be an integer");
return;
end if;
Parameter := Param;
end if;
when Iir_Kind_Succ_Attribute
| Iir_Kind_Pred_Attribute
| Iir_Kind_Leftof_Attribute
| Iir_Kind_Rightof_Attribute =>
-- LRM93 14.1
-- Parameter: An expression whose type is the base type of T.
Parameter := Sem_Expression (Param, Prefix_Bt);
when Iir_Kind_Image_Attribute =>
-- LRM93 14.1
-- Parameter: An expression whose type is the base type of T.
Parameter := Sem_Expression (Param, Prefix_Bt);
when Iir_Kind_Value_Attribute =>
-- Parameter: An expression of type string.
Parameter := Sem_Expression (Param, String_Type_Definition);
when others =>
raise Internal_Error;
end case;
pragma Assert (Get_Parameter (Attr) = Null_Iir);
if Parameter = Null_Iir then
Set_Parameter (Attr, Param);
Set_Expr_Staticness (Attr, None);
return;
end if;
Set_Parameter (Attr, Parameter);
Set_Expr_Staticness (Attr, Min (Get_Type_Staticness (Prefix_Type),
Get_Expr_Staticness (Parameter)));
Set_Name_Staticness (Attr, Get_Expr_Staticness (Attr));
end Finish_Sem_Scalar_Type_Attribute;
-- Finish analysis of attributes for signals.
procedure Finish_Sem_Signal_Attribute (Attr : Iir)
is
Prefix : constant Iir := Get_Prefix (Attr);
begin
-- According to LRM 7.4, signal attributes are not static expressions
-- since the prefix (a signal) is not a static expression.
Set_Expr_Staticness (Attr, None);
-- For all signal attributes:
--
-- LRM93 14.1 Predefined attributes
-- Prefix: any signal denoted by the static signal name S.
if Get_Name_Staticness (Prefix) < Globally then
Error_Msg_Sem
(+Attr, "prefix of %n must be a static name", +Attr);
end if;
-- LRM02 6.1 / LRM08 8.1
-- A name is said to be a static name if and only if at least one of
-- the following conditions holds:
-- [...]
-- - The name is a attribute name whose prefix is a static signal name
-- and whose suffix is one of the predefined attributes 'DELAYED,
-- 'STABLE, 'QUIET or 'TRANSACTION.
-- According to LRM 6.1, attributes are not static names.
if Flag_Relaxed_Rules or Flags.Vhdl_Std >= Vhdl_02 then
case Get_Kind (Attr) is
when Iir_Kind_Stable_Attribute
| Iir_Kind_Quiet_Attribute
| Iir_Kind_Delayed_Attribute
| Iir_Kind_Transaction_Attribute =>
Set_Name_Staticness (Attr, Get_Name_Staticness (Prefix));
when others =>
Set_Name_Staticness (Attr, None);
end case;
else
Set_Name_Staticness (Attr, None);
end if;
end Finish_Sem_Signal_Attribute;
-- Finish analysis of attributes that are signals for signals
procedure Finish_Sem_Signal_Attribute_Signal (Attr : Iir; Parameter : Iir)
is
pragma Assert (Parameter /= Null_Iir);
Param : Iir;
begin
if Get_Kind (Attr) = Iir_Kind_Transaction_Attribute then
Error_Msg_Sem (+Attr, "'transaction does not allow a parameter");
return;
end if;
Param := Sem_Expression (Parameter, Time_Subtype_Definition);
if Param /= Null_Iir then
-- LRM93 14.1
-- Parameter: A static expression of type TIME [that evaluate
-- to a nonnegative value.]
if Get_Expr_Staticness (Param) = None then
Error_Msg_Sem
(+Param, "parameter of signal attribute must be static");
end if;
Set_Parameter (Attr, Param);
end if;
end Finish_Sem_Signal_Attribute_Signal;
procedure Sem_Quantity_Attribute_Parameters
(Attr : Iir; Params : Iir_Array; Params_Type : Iir_Array; Min : Natural)
is
Param : Iir;
begin
pragma Assert (Params'First = 1);
pragma Assert (Params_Type'First = 1);
pragma Assert (Params_Type'Last = Params'Last);
for I in Params'Range loop
Param := Params (I);
if Param = Null_Iir then
if I <= Min then
Error_Msg_Sem
(+Attr, "not enough parameters for the attribute");
end if;
return;
end if;
if Params_Type (I) = Null_Iir then
Error_Msg_Sem (+Attr, "too many parameters for the attribute");
return;
end if;
Param := Sem_Expression (Param, Params_Type (I));
if Param /= Null_Iir then
if Get_Expr_Staticness (Param) < Globally then
Error_Msg_Sem
(+Param, "parameter must be a static expression");
end if;
Set_Attribute_Parameter (Attr, I, Param);
end if;
end loop;
end Sem_Quantity_Attribute_Parameters;
procedure Finish_Sem_Quantity_Attribute
(Attr_Name : Iir; Attr : Iir; Params : Iir_Array)
is
Prefix : Iir;
Param : Iir;
begin
Prefix := Get_Prefix (Attr_Name);
Set_Prefix (Attr, Prefix);
Free_Iir (Attr_Name);
case Get_Kind (Attr) is
when Iir_Kind_Quantity_Delayed_Attribute =>
-- AMS-LRM17 16.2.6
-- Q'DELAYED[(T)]
-- Parameter:
-- T: A static expression of type REAL that evaluates to a
-- non-negative number. If omitted, defaults to 0.0.
Sem_Quantity_Attribute_Parameters
(Attr, Params, (1 => Real_Type_Definition,
2 .. 4 => Null_Iir), 0);
when Iir_Kind_Above_Attribute =>
pragma Assert (Params'First = 1 and Params'Last = 1);
if Params (1) = Null_Iir then
Error_Msg_Sem (+Attr, "'above requires a parameter");
else
-- FIXME: AMS-LRM17 16.2.6
-- Any quantity appearing in the expression shall be denoted by
-- a static name.
Param := Sem_Expression (Params (1), Get_Type (Prefix));
if Param /= Null_Iir then
Set_Parameter (Attr, Param);
end if;
end if;
when Iir_Kind_Ramp_Attribute
| Iir_Kind_Signal_Slew_Attribute
| Iir_Kind_Quantity_Slew_Attribute =>
pragma Assert (Params'First = 1 and Params'Last = 4);
-- AMS-LRM17 16.2.6
-- S'RAMP [(TRISE [, TFALL])]
-- Parameters:
-- TRISE: a static expression of a floating-point type that
-- evaluates to a nonnegative value. If omitted, it
-- defaults to 0.
-- TFALL: a static expression of a floating-point type that
-- evaluates to a nonnegative value. If omitted, it
-- defaults to the value of TRISE.
--
-- S'SLEW [(RISING_SLOP [, FALLING_SLOPE])]
-- Parameters:
-- RISING_SLOPE: a static expression of type REAL that
-- evaluates to a positive value. If omitted, it defaults
-- to REAL'HIGH, which is interpreted as an infinite slope.
-- FALLING_SLOPE: a static expression of type REAL that
-- evaluates to a negative value. If omitted, it defaults
-- to the negative of RISING_SLOPE. The value REAL'LOW is
-- interpreted as a negative infinite slope.
--
-- Q'SLEW [(MAX_RISING_SLOPE [, MAX_FALLING_SLOPE])]
-- Parameters:
-- MAX_RISING_SLOPE: a static expression of type REAL that
-- evaluates to a positive value. If omitted, it defaults
-- to REAL'HIGH, which is interpreted as an infinite slope.
-- MAX_FALLING_SLOPE: a static expression of type REAL that
-- evaluates to a negative value. If omitted, it defaults
-- to the negative of MAX_RISING_SLOPE. The value REAL'LOW
-- is interpreted as a negative infinite slope.
Sem_Quantity_Attribute_Parameters
(Attr, Params, (1 => Real_Type_Definition,
2 => Real_Type_Definition,
3 | 4 => Null_Iir), 1);
when Iir_Kind_Zoh_Attribute =>
-- AMS-LRM17 16.2.6
-- Q'LTF(T [, INITIAL_DELAY)
-- Parameters:
-- T: A static expression of type REAL that evaluates to a
-- positive value. This is the sampling period.
-- INITIAL_DELAY: A static expression of type REAL that
-- evaluates to a non-negative value. The first sampling will
-- occur after INITIAL_DELAY seconds. If omitted, it defaults
-- to 0.0.
Sem_Quantity_Attribute_Parameters
(Attr, Params, (1 => Real_Type_Definition,
2 => Real_Type_Definition,
3 | 4 => Null_Iir), 1);
when Iir_Kind_Ltf_Attribute =>
-- AMS-LRM17 16.2.6
-- Q'LTF(NUM, DEN)
-- Parameters:
-- NUM: a static expression of type REAL_VECTOR that contains
-- the numerator coefficients.
-- DEN: a static expression of type REAL_VECTOR that contains
-- the denominator coefficients.
Sem_Quantity_Attribute_Parameters
(Attr, Params, (1 => Real_Vector_Type_Definition,
2 => Real_Vector_Type_Definition,
3 | 4 => Null_Iir), 2);
when Iir_Kind_Ztf_Attribute =>
-- AMS-LRM17 16.2.6
-- Q'ZTF(NUM, DEN, T, [, INITIAL_DELAY])
-- Parameters:
-- NUM: A static expression of type REAL_VECTOR with the
-- numerator coefficients.
-- DEN: A static expression of type REAL_VECTOR with the
-- denominator coefficients.
-- T: A static expression of type REAL that evaluates to a
-- positive value, which is the sampling period.
-- INITIAL_DELAY: A static expression of type REAL that
-- evaluates to a non-negative value, which is the time of the
-- first sampling. If omitted, it defaults to 0.0
Sem_Quantity_Attribute_Parameters
(Attr, Params, (1 => Real_Vector_Type_Definition,
2 => Real_Vector_Type_Definition,
3 => Real_Type_Definition,
4 => Real_Type_Definition), 3);
when others =>
Error_Kind ("finish_sem_quantity_attribute", Attr);
end case;
end Finish_Sem_Quantity_Attribute;
function Is_Type_Abstract_Numeric (Atype : Iir) return Boolean is
begin
case Get_Kind (Atype) is
when Iir_Kind_Integer_Subtype_Definition
| Iir_Kind_Integer_Type_Definition
| Iir_Kind_Floating_Subtype_Definition
| Iir_Kind_Floating_Type_Definition =>
return True;
when others =>
return False;
end case;
end Is_Type_Abstract_Numeric;
function Are_Types_Closely_Related (Type1, Type2 : Iir) return Boolean
is
Base_Type1 : constant Iir := Get_Base_Type (Type1);
Base_Type2 : constant Iir := Get_Base_Type (Type2);
Ant1, Ant2 : Boolean;
Index_List1, Index_List2 : Iir_Flist;
El1, El2 : Iir;
begin
-- LRM 7.3.5
-- In particular, a type is closely related to itself.
if Base_Type1 = Base_Type2 then
return True;
end if;
-- LRM 7.3.5
-- a) Abstract Numeric Types: Any abstract numeric type is closely
-- related to any other abstract numeric type.
Ant1 := Is_Type_Abstract_Numeric (Type1);
Ant2 := Is_Type_Abstract_Numeric (Type2);
if Ant1 and Ant2 then
return True;
end if;
if Ant1 or Ant2 then
return False;
end if;
-- LRM 7.3.5
-- b) Array Types: Two array types are closely related if and only if
-- The types have the same dimensionality; For each index position,
-- the index types are either the same or are closely related; and
-- The element types are the same.
--
-- No other types are closely related.
if not (Get_Kind (Base_Type1) = Iir_Kind_Array_Type_Definition
and then Get_Kind (Base_Type2) = Iir_Kind_Array_Type_Definition)
then
return False;
end if;
Index_List1 := Get_Index_Subtype_List (Base_Type1);
Index_List2 := Get_Index_Subtype_List (Base_Type2);
if Get_Nbr_Elements (Index_List1) /= Get_Nbr_Elements (Index_List2) then
return False;
end if;
if Get_Base_Type (Get_Element_Subtype (Base_Type1))
/= Get_Base_Type (Get_Element_Subtype (Base_Type2))
then
return False;
end if;
for I in Flist_First .. Flist_Last (Index_List1) loop
El1 := Get_Index_Type (Index_List1, I);
El2 := Get_Index_Type (Index_List2, I);
if not Are_Types_Closely_Related (El1, El2) then
return False;
end if;
end loop;
return True;
end Are_Types_Closely_Related;
function Sem_Type_Conversion
(Name : Iir; Type_Mark : Iir; Actual : Iir; In_Formal : Boolean)
return Iir
is
Conv_Type : constant Iir := Get_Type (Type_Mark);
Conv : Iir_Type_Conversion;
Expr : Iir;
Staticness : Iir_Staticness;
begin
Conv := Create_Iir (Iir_Kind_Type_Conversion);
Location_Copy (Conv, Name);
Set_Type_Mark (Conv, Type_Mark);
Set_Type (Conv, Conv_Type);
Set_Expression (Conv, Actual);
-- Default staticness in case of error.
Set_Expr_Staticness (Conv, None);
-- Bail out if no actual (or invalid one).
if Actual = Null_Iir then
return Conv;
end if;
-- LRM93 7.3.5
-- Furthermore, the operand of a type conversion is not allowed to be
-- the literal null, an allocator, an aggregate, or a string literal.
case Get_Kind (Actual) is
when Iir_Kind_Null_Literal
| Iir_Kind_Aggregate
| Iir_Kind_String_Literal8
| Iir_Kinds_Allocator =>
Error_Msg_Sem
(+Actual, "%n cannot be a type conversion operand", +Actual);
return Conv;
when Iir_Kind_Range_Expression =>
-- Try to nicely handle expression like NAME (A to B).
Error_Msg_Sem
(+Actual, "subtype indication not allowed in an expression");
return Conv;
when Iir_Kind_Error =>
return Conv;
when others =>
null;
end case;
-- LRM93 7.3.5
-- The type of the operand of a type conversion must be
-- determinable independent of the context (in particular,
-- independent of the target type).
Expr := Sem_Expression_Universal (Actual);
if Expr = Null_Iir then
return Conv;
end if;
Set_Expression (Conv, Expr);
-- LRM93 7.4.1 Locally Static Primaries.
-- 9. a type conversion whose expression is a locally static expression.
-- LRM93 7.4.2 Globally Static Primaries.
-- 14. a type conversion whose expression is a globally static
-- expression.
Staticness := Get_Expr_Staticness (Expr);
-- If the type mark is not locally static, the expression cannot
-- be locally static. This was clarified in VHDL 08, but a type
-- mark that denotes an unconstrained array type, does not prevent
-- the expression from being static.
if Get_Kind (Conv_Type) not in Iir_Kinds_Array_Type_Definition
or else Get_Constraint_State (Conv_Type) = Fully_Constrained
then
Staticness := Min (Staticness, Get_Type_Staticness (Conv_Type));
end if;
-- LRM87 7.4 Static Expressions
-- A type conversion is not a locally static expression.
if Flags.Vhdl_Std = Vhdl_87 then
Staticness := Min (Globally, Staticness);
end if;
Set_Expr_Staticness (Conv, Staticness);
if not Are_Types_Closely_Related (Conv_Type, Get_Type (Expr)) then
-- FIXME: should explain why the types are not closely related.
Error_Msg_Sem
(+Conv, "conversion allowed only between closely related types");
-- Avoid error storm in evaluation.
Set_Expr_Staticness (Conv, None);
else
-- Unless the type conversion appears in the formal part of an
-- association, the expression must be readable.
if not In_Formal then
Check_Read (Expr);
end if;
end if;
return Conv;
end Sem_Type_Conversion;
-- OBJ is an 'impure' object (variable, signal or file) referenced at
-- location LOC.
-- Check the pure rules (LRM08 4 Subprograms and packages,
-- LRM08 4.3 Subprograms bodies).
procedure Sem_Check_Pure (Loc : Iir; Obj : Iir)
is
procedure Update_Impure_Depth (Subprg_Spec : Iir; Depth : Iir_Int32)
is
Bod : constant Iir := Get_Subprogram_Body (Subprg_Spec);
begin
if Bod = Null_Iir then
return;
end if;
if Depth < Get_Impure_Depth (Bod) then
Set_Impure_Depth (Bod, Depth);
end if;
end Update_Impure_Depth;
procedure Error_Pure (Subprg : Iir; Obj : Iir)
is
begin
Error_Msg_Sem_Relaxed
(Loc, Warnid_Pure,
"reference to %n violate pure rule for %n", (+Obj, +Subprg));
end Error_Pure;
Subprg : constant Iir := Sem_Stmts.Get_Current_Subprogram;
Subprg_Body : Iir;
Parent : Iir;
Decl : Iir;
begin
-- Apply only in subprograms.
if Subprg = Null_Iir then
return;
end if;
case Get_Kind (Subprg) is
when Iir_Kinds_Process_Statement
| Iir_Kind_Simultaneous_Procedural_Statement =>
return;
when Iir_Kind_Procedure_Declaration =>
-- Exit now if already known as impure.
if Get_Purity_State (Subprg) = Impure then
return;
end if;
when Iir_Kind_Function_Declaration =>
-- Exit now if impure.
if Get_Pure_Flag (Subprg) = False then
return;
end if;
when others =>
Error_Kind ("sem_check_pure", Subprg);
end case;
-- Follow aliases.
if Get_Kind (Obj) = Iir_Kind_Object_Alias_Declaration then
Decl := Get_Object_Prefix (Get_Name (Obj));
else
Decl := Obj;
end if;
-- Not all objects are impure.
case Get_Kind (Decl) is
when Iir_Kind_Object_Alias_Declaration =>
raise Program_Error;
when Iir_Kind_Guard_Signal_Declaration
| Iir_Kind_Signal_Declaration
| Iir_Kind_Variable_Declaration
| Iir_Kind_Interface_File_Declaration =>
null;
when Iir_Kind_Interface_Variable_Declaration
| Iir_Kind_Interface_Signal_Declaration =>
-- When referenced as a formal name (FIXME: this is an
-- approximation), the rules don't apply.
if not Get_Is_Within_Flag (Get_Parent (Decl)) then
return;
end if;
when Iir_Kind_File_Declaration =>
-- LRM 93 2.2
-- If a pure function is the parent of a given procedure, then
-- that procedure must not contain a reference to an explicitly
-- declared file object [...]
--
-- A pure function must not contain a reference to an explicitly
-- declared file.
if Get_Kind (Subprg) = Iir_Kind_Function_Declaration then
Error_Pure (Subprg, Obj);
else
Set_Purity_State (Subprg, Impure);
Set_Impure_Depth (Get_Subprogram_Body (Subprg),
Iir_Depth_Impure);
end if;
return;
when others =>
return;
end case;
-- DECL is declared in the immediate declarative part of the subprogram.
Parent := Get_Parent (Decl);
Subprg_Body := Get_Subprogram_Body (Subprg);
if Parent = Subprg or else Parent = Subprg_Body then
return;
end if;
-- Function.
if Get_Kind (Subprg) = Iir_Kind_Function_Declaration then
Error_Pure (Subprg, Obj);
return;
end if;
case Get_Kind (Parent) is
when Iir_Kind_Entity_Declaration
| Iir_Kind_Architecture_Body
| Iir_Kind_Package_Declaration
| Iir_Kind_Package_Body
| Iir_Kind_Block_Statement
| Iir_Kind_If_Generate_Statement
| Iir_Kind_For_Generate_Statement
| Iir_Kind_Generate_Statement_Body
| Iir_Kinds_Process_Statement
| Iir_Kind_Protected_Type_Body =>
-- The procedure is impure.
Set_Purity_State (Subprg, Impure);
Set_Impure_Depth (Subprg_Body, Iir_Depth_Impure);
return;
when Iir_Kind_Function_Body
| Iir_Kind_Procedure_Body =>
Update_Impure_Depth
(Subprg,
Get_Subprogram_Depth (Get_Subprogram_Specification (Parent)));
when Iir_Kind_Function_Declaration
| Iir_Kind_Procedure_Declaration =>
Update_Impure_Depth (Subprg, Get_Subprogram_Depth (Parent));
when others =>
Error_Kind ("sem_check_pure(2)", Parent);
end case;
end Sem_Check_Pure;
-- Set All_Sensitized_State to False iff OBJ is a signal declaration
-- and the current subprogram is in a package body.
procedure Sem_Check_All_Sensitized (Obj : Iir)
is
Subprg : Iir;
begin
-- We cares only of signals.
if Get_Kind (Obj) /= Iir_Kind_Signal_Declaration then
return;
end if;
-- We cares only of subprograms. Give up if we are in a process.
Subprg := Sem_Stmts.Get_Current_Subprogram;
if Subprg = Null_Iir
or else Get_Kind (Subprg) not in Iir_Kinds_Subprogram_Declaration
then
return;
end if;
if Get_Kind (Get_Library_Unit (Sem.Get_Current_Design_Unit))
= Iir_Kind_Package_Body
then
Set_All_Sensitized_State (Subprg, Invalid_Signal);
else
Set_All_Sensitized_State (Subprg, Read_Signal);
end if;
end Sem_Check_All_Sensitized;
-- Free overload list of NAME but keep RES interpretation.
procedure Free_Old_Entity_Name (Name : Iir; Res : Iir)
is
Old_Res : constant Iir := Get_Named_Entity (Name);
begin
if Old_Res /= Null_Iir and then Old_Res /= Res then
pragma Assert (Is_Overload_List (Old_Res));
Sem_Name_Free_Result (Old_Res, Res);
end if;
Set_Named_Entity (Name, Res);
end Free_Old_Entity_Name;
function Finish_Sem_Denoting_Name (Name : Iir; Res : Iir) return Iir is
begin
case Iir_Kinds_Denoting_Name (Get_Kind (Name)) is
when Iir_Kind_Simple_Name
| Iir_Kind_Character_Literal
| Iir_Kind_Operator_Symbol =>
Set_Base_Name (Name, Res);
Xref_Ref (Name, Res);
return Name;
when Iir_Kind_Selected_Name =>
declare
Prefix, Res_Prefix : Iir;
Old_Res : Iir;
begin
Xref_Ref (Name, Res);
Prefix := Name;
Res_Prefix := Res;
loop
Prefix := Get_Prefix (Prefix);
Res_Prefix := Get_Parent (Res_Prefix);
-- Get the parent for expanded_name, may skip some parents.
case Get_Kind (Res_Prefix) is
when Iir_Kind_Design_Unit =>
Res_Prefix :=
Get_Library (Get_Design_File (Res_Prefix));
when others =>
null;
end case;
pragma Assert (Get_Kind (Prefix) in Iir_Kinds_Denoting_Name);
Xref_Ref (Prefix, Res_Prefix);
-- Cannot use Free_Old_Entity_Name as a prefix may not be
-- the parent (for protected subprogram calls).
Old_Res := Get_Named_Entity (Prefix);
if Is_Overload_List (Old_Res) then
Free_Iir (Old_Res);
Set_Named_Entity (Prefix, Res_Prefix);
end if;
exit when Get_Kind (Prefix) /= Iir_Kind_Selected_Name;
end loop;
end;
return Name;
when Iir_Kind_Reference_Name =>
-- Not in the sources.
raise Internal_Error;
end case;
end Finish_Sem_Denoting_Name;
function Finish_Sem_Name_1 (Name : Iir; Res : Iir) return Iir
is
Prefix : Iir;
Name_Prefix : Iir;
Name_Res : Iir;
begin
case Get_Kind (Res) is
when Iir_Kinds_Library_Unit =>
return Finish_Sem_Denoting_Name (Name, Res);
when Iir_Kinds_Sequential_Statement
| Iir_Kinds_Concurrent_Statement =>
-- Label or part of an expanded name (for process, block
-- and generate).
return Finish_Sem_Denoting_Name (Name, Res);
when Iir_Kinds_Object_Declaration
| Iir_Kind_Enumeration_Literal
| Iir_Kind_Unit_Declaration
| Iir_Kind_Psl_Endpoint_Declaration =>
Name_Res := Finish_Sem_Denoting_Name (Name, Res);
Set_Base_Name (Name_Res, Res);
Set_Name_Staticness (Name_Res, Get_Name_Staticness (Res));
Set_Expr_Staticness (Name_Res, Get_Expr_Staticness (Res));
Sem_Check_Pure (Name_Res, Res);
Sem_Check_All_Sensitized (Res);
Set_Type (Name_Res, Get_Type (Res));
return Name_Res;
when Iir_Kind_Terminal_Declaration
| Iir_Kind_Interface_Terminal_Declaration =>
Name_Res := Finish_Sem_Denoting_Name (Name, Res);
Set_Base_Name (Name_Res, Res);
Set_Name_Staticness (Name_Res, Get_Name_Staticness (Res));
Sem_Check_Pure (Name_Res, Res);
return Name_Res;
when Iir_Kind_Attribute_Value =>
pragma Assert (Get_Kind (Name) = Iir_Kind_Attribute_Name);
Prefix := Finish_Sem_Name (Get_Prefix (Name));
Set_Prefix (Name, Prefix);
if Get_Is_Forward_Ref (Prefix) then
Set_Base_Name (Prefix, Null_Iir);
end if;
Set_Base_Name (Name, Res);
Set_Type (Name, Get_Type (Res));
Set_Name_Staticness (Name, Get_Name_Staticness (Res));
Set_Expr_Staticness (Name, Get_Expr_Staticness (Res));
return Name;
when Iir_Kind_Type_Declaration
| Iir_Kind_Subtype_Declaration
| Iir_Kind_Nature_Declaration
| Iir_Kind_Subnature_Declaration
| Iir_Kind_Component_Declaration
| Iir_Kind_Group_Template_Declaration
| Iir_Kind_Group_Declaration
| Iir_Kind_Attribute_Declaration
| Iir_Kind_Non_Object_Alias_Declaration
| Iir_Kind_Library_Declaration
| Iir_Kind_Interface_Package_Declaration
| Iir_Kind_Interface_Type_Declaration =>
Name_Res := Finish_Sem_Denoting_Name (Name, Res);
Set_Base_Name (Name_Res, Res);
return Name_Res;
when Iir_Kind_Function_Declaration
| Iir_Kind_Interface_Function_Declaration =>
Name_Res := Finish_Sem_Denoting_Name (Name, Res);
Set_Type (Name_Res, Get_Return_Type (Res));
return Name_Res;
when Iir_Kind_Procedure_Declaration
| Iir_Kind_Interface_Procedure_Declaration =>
return Finish_Sem_Denoting_Name (Name, Res);
when Iir_Kind_Type_Conversion =>
pragma Assert (Get_Kind (Name) = Iir_Kind_Parenthesis_Name);
Set_Type_Mark (Res, Sem_Type_Mark (Get_Prefix (Name)));
Free_Parenthesis_Name (Name, Res);
return Res;
when Iir_Kind_Indexed_Name
| Iir_Kind_Selected_Element
| Iir_Kind_Slice_Name
| Iir_Kind_Dereference =>
-- Fall through.
null;
when Iir_Kind_Implicit_Dereference =>
-- The name may not have a prefix.
Prefix := Finish_Sem_Name_1 (Name, Get_Prefix (Res));
Set_Prefix (Res, Prefix);
Finish_Sem_Dereference (Res);
return Res;
when Iir_Kind_Function_Call =>
case Get_Kind (Name) is
when Iir_Kind_Parenthesis_Name =>
-- Usual case.
Prefix := Finish_Sem_Name
(Get_Prefix (Name), Get_Implementation (Res));
Finish_Sem_Function_Call (Res, Prefix);
Free_Iir (Name);
when Iir_Kinds_Denoting_Name =>
-- Call without association list.
Prefix := Finish_Sem_Name (Name, Get_Implementation (Res));
Finish_Sem_Function_Call (Res, Prefix);
when others =>
Error_Kind ("Finish_Sem_Name(function call)", Name);
end case;
return Res;
when Iir_Kinds_Array_Attribute =>
if Get_Parameter (Res) = Null_Iir then
Finish_Sem_Array_Attribute (Name, Res, Null_Iir);
end if;
if Get_Kind (Name) = Iir_Kind_Attribute_Name then
Free_Iir (Name);
else
Free_Iir (Get_Prefix (Name));
Free_Parenthesis_Name (Name, Res);
end if;
return Res;
when Iir_Kinds_Scalar_Type_Attribute
| Iir_Kind_Image_Attribute
| Iir_Kind_Value_Attribute =>
if Get_Parameter (Res) = Null_Iir then
Finish_Sem_Scalar_Type_Attribute (Name, Res, Null_Iir);
else
Free_Parenthesis_Name (Name, Res);
end if;
return Res;
when Iir_Kind_Across_Attribute
| Iir_Kind_Through_Attribute
| Iir_Kind_Nature_Reference_Attribute =>
null;
when Iir_Kinds_Signal_Value_Attribute =>
null;
when Iir_Kinds_Signal_Attribute =>
-- Cannot use the common code below for the prefix, because
-- the parenthesis_name is absorbed as a parameter.
Prefix := Get_Prefix (Res);
Name_Prefix := Get_Prefix (Name);
if Get_Kind (Name) = Iir_Kind_Parenthesis_Name then
-- Skip the parenthesis name.
Prefix := Finish_Sem_Name_1 (Get_Prefix (Name_Prefix), Prefix);
Set_Prefix (Res, Prefix);
-- But free it.
Free_Parenthesis_Name (Name, Res);
else
pragma Assert (Get_Parameter (Res) = Null_Iir);
Prefix := Finish_Sem_Name (Name_Prefix, Prefix);
Set_Prefix (Res, Prefix);
Free_Iir (Name);
end if;
Finish_Sem_Signal_Attribute (Res);
return Res;
when Iir_Kind_Above_Attribute
| Iir_Kind_Ramp_Attribute
| Iir_Kind_Quantity_Slew_Attribute
| Iir_Kind_Signal_Slew_Attribute
| Iir_Kind_Zoh_Attribute
| Iir_Kind_Ltf_Attribute
| Iir_Kind_Ztf_Attribute
| Iir_Kind_Quantity_Delayed_Attribute =>
if Get_Parameter (Res) = Null_Iir then
-- Not finished. Need to emit an error message.
Finish_Sem_Quantity_Attribute (Name, Res, (1 => Null_Iir));
else
Free_Parenthesis_Name (Name, Res);
end if;
return Res;
when Iir_Kind_Dot_Attribute
| Iir_Kind_Integ_Attribute =>
-- Already finished.
return Res;
when Iir_Kinds_Type_Attribute
| Iir_Kind_Subtype_Attribute
| Iir_Kind_Base_Attribute =>
pragma Assert (Get_Kind (Name) = Iir_Kind_Attribute_Name);
Free_Iir (Name);
return Res;
when Iir_Kind_Simple_Name_Attribute
| Iir_Kind_Path_Name_Attribute
| Iir_Kind_Instance_Name_Attribute =>
Free_Iir (Name);
return Res;
when Iir_Kinds_External_Name =>
pragma Assert (Name = Res);
return Res;
when Iir_Kind_Psl_Expression =>
return Res;
when Iir_Kind_Psl_Declaration =>
return Name;
when Iir_Kind_Element_Declaration =>
-- Certainly an error!
return Name;
when Iir_Kind_Error =>
return Name;
when others =>
Error_Kind ("finish_sem_name_1", Res);
end case;
-- The name has a prefix, finish it.
Prefix := Get_Prefix (Res);
Name_Prefix := Get_Prefix (Name);
Prefix := Finish_Sem_Name_1 (Name_Prefix, Prefix);
Set_Prefix (Res, Prefix);
case Get_Kind (Res) is
when Iir_Kind_Indexed_Name =>
Finish_Sem_Indexed_Name (Res);
Free_Parenthesis_Name (Name, Res);
when Iir_Kind_Slice_Name =>
Finish_Sem_Slice_Name (Res);
Free_Parenthesis_Name (Name, Res);
when Iir_Kind_Selected_Element =>
pragma Assert (Get_Kind (Name) = Iir_Kind_Selected_Name);
Xref_Ref (Res, Get_Named_Entity (Res));
Set_Name_Staticness (Res, Get_Name_Staticness (Prefix));
Set_Expr_Staticness (Res, Get_Expr_Staticness (Prefix));
Set_Base_Name (Res, Get_Base_Name (Prefix));
Free_Iir (Name);
when Iir_Kind_Dereference =>
pragma Assert (Get_Kind (Name) = Iir_Kind_Selected_By_All_Name);
Finish_Sem_Dereference (Res);
Free_Iir (Name);
when Iir_Kind_Subtype_Attribute
| Iir_Kind_Through_Attribute
| Iir_Kind_Across_Attribute
| Iir_Kind_Nature_Reference_Attribute =>
Sem_Name_Free_Result (Name, Res);
when Iir_Kinds_Signal_Value_Attribute =>
Sem_Name_Free_Result (Name, Res);
Finish_Sem_Signal_Attribute (Res);
when others =>
Error_Kind ("finish_sem_name_1(2)", Res);
end case;
return Res;
end Finish_Sem_Name_1;
function Finish_Sem_Name (Name : Iir; Res : Iir) return Iir is
begin
if Get_Kind (Res) /= Iir_Kind_Implicit_Dereference then
-- There is no corresponding name for implicit_dereference (because
-- it is implicit).
-- Free overload list (but keep RES interpretation) for other cases.
Free_Old_Entity_Name (Name, Res);
end if;
return Finish_Sem_Name_1 (Name, Res);
end Finish_Sem_Name;
function Finish_Sem_Name (Name : Iir) return Iir is
begin
return Finish_Sem_Name_1 (Name, Get_Named_Entity (Name));
end Finish_Sem_Name;
-- LRM93 6.2
-- The evaluation of a simple name has no other effect than to determine
-- the named entity denoted by the name.
--
-- NAME may be a simple name, a strig literal or a character literal.
-- GHDL: set interpretation of NAME (possibly an overload list) or
-- error_mark for unknown names.
-- If SOFT is TRUE, then no error message is reported in case of failure.
procedure Sem_Simple_Name (Name : Iir; Keep_Alias : Boolean; Soft : Boolean)
is
Id : constant Name_Id := Get_Identifier (Name);
Interpretation: Name_Interpretation_Type;
Res: Iir;
Res_List : Iir_List;
Res_It : List_Iterator;
N : Natural;
begin
Interpretation := Get_Interpretation (Id);
if not Valid_Interpretation (Interpretation) then
-- Unknown name.
if not Soft then
Interpretation := Get_Interpretation_Raw (Id);
if Valid_Interpretation (Interpretation)
and then Is_Conflict_Declaration (Interpretation)
then
Error_Msg_Sem
(+Name, "no declaration for %i (due to conflicts)", +Name);
else
Error_Msg_Sem (+Name, "no declaration for %i", +Name);
end if;
end if;
Res := Error_Mark;
elsif not Valid_Interpretation (Get_Next_Interpretation (Interpretation))
then
-- One simple interpretation.
Res := Get_Declaration (Interpretation);
-- For a design unit, return the library unit
if Get_Kind (Res) = Iir_Kind_Design_Unit then
-- FIXME: should replace interpretation ?
Load_Design_Unit (Res, Name);
Sem.Add_Dependence (Res);
Res := Get_Library_Unit (Res);
end if;
-- Check visibility.
if not Get_Visible_Flag (Res) then
if Flag_Relaxed_Rules
and then Get_Kind (Res) in Iir_Kinds_Object_Declaration
and then Valid_Interpretation (Get_Under_Interpretation (Id))
then
Res := Get_Declaration (Get_Under_Interpretation (Id));
else
if not Soft then
Error_Msg_Sem (+Name, "%n is not visible here", +Res);
end if;
-- Even if a named entity was found, return an error_mark.
-- Indeed, the named entity found is certainly the one being
-- analyzed, and the analyze may be uncomplete.
Res := Error_Mark;
end if;
end if;
if not Keep_Alias
and then Get_Kind (Res) = Iir_Kind_Non_Object_Alias_Declaration
then
Set_Alias_Declaration (Name, Res);
Res := Get_Named_Entity (Get_Name (Res));
end if;
else
-- Name is overloaded.
Res_List := Create_Iir_List;
N := 0;
-- The SEEN_FLAG is used to get only one meaning which can be reached
-- through several paths (such as aliases).
while Valid_Interpretation (Interpretation) loop
if Keep_Alias then
Res := Get_Declaration (Interpretation);
else
Res := Get_Non_Alias_Declaration (Interpretation);
end if;
if not Get_Seen_Flag (Res) then
Set_Seen_Flag (Res, True);
N := N + 1;
Append_Element (Res_List, Res);
end if;
Interpretation := Get_Next_Interpretation (Interpretation);
end loop;
-- FIXME: there can be only one element (a function and its alias!).
-- Clear SEEN_FLAG.
Res_It := List_Iterate (Res_List);
while Is_Valid (Res_It) loop
Set_Seen_Flag (Get_Element (Res_It), False);
Next (Res_It);
end loop;
Res := Create_Overload_List (Res_List);
end if;
Set_Named_Entity (Name, Res);
end Sem_Simple_Name;
-- LRM93 6.3
-- Selected Names.
procedure Sem_Selected_Name
(Name: Iir; Keep_Alias : Boolean := False; Soft : Boolean := False)
is
Suffix : constant Name_Id := Get_Identifier (Name);
Prefix_Name : constant Iir := Get_Prefix (Name);
Prefix_Loc : constant Location_Type := Get_Location (Prefix_Name);
Prefix: Iir;
Res : Iir;
-- Analyze SUB_NAME.NAME as an expanded name (ie, NAME is declared
-- within SUB_NAME). This is possible only if the expanded name is
-- analyzed within the context of SUB_NAME.
procedure Sem_As_Expanded_Name (Sub_Name : Iir)
is
Sub_Res : Iir;
begin
if Get_Is_Within_Flag (Sub_Name) then
Sub_Res := Find_Declarations_In_List (Sub_Name, Name, Keep_Alias);
if Sub_Res /= Null_Iir then
Add_Result (Res, Sub_Res);
end if;
end if;
end Sem_As_Expanded_Name;
-- LRM93 6.3
-- For a selected name that is used to denote a record element,
-- the suffix must be a simple name denoting an element of a
-- record object or value. The prefix must be appropriate for the
-- type of this object or value.
--
-- Analyze SUB_NAME.NAME as a selected element.
procedure Sem_As_Selected_Element (Sub_Name : Iir)
is
Name_Type : Iir;
Ptr_Type : Iir;
Rec_El : Iir;
R : Iir;
Se : Iir;
begin
Name_Type := Get_Type (Sub_Name);
if Kind_In (Name_Type, Iir_Kind_Access_Type_Definition,
Iir_Kind_Access_Subtype_Definition)
then
Ptr_Type := Name_Type;
Name_Type := Get_Designated_Type (Name_Type);
else
Ptr_Type := Null_Iir;
end if;
-- Only records have elements.
if not Kind_In (Name_Type, Iir_Kind_Record_Type_Definition,
Iir_Kind_Record_Subtype_Definition)
then
return;
end if;
Rec_El := Find_Name_In_Flist
(Get_Elements_Declaration_List (Name_Type), Suffix);
if Rec_El = Null_Iir then
-- No such element in the record type.
return;
end if;
if not Maybe_Function_Call (Sub_Name) then
return;
end if;
R := Maybe_Insert_Function_Call (Prefix_Name, Sub_Name);
R := Maybe_Insert_Dereference (R, Ptr_Type);
Se := Create_Iir (Iir_Kind_Selected_Element);
Location_Copy (Se, Name);
Set_Prefix (Se, R);
Set_Type (Se, Get_Type (Rec_El));
Set_Identifier (Se, Suffix);
Set_Named_Entity (Se, Rec_El);
Set_Base_Name (Se, Get_Object_Prefix (R, False));
Add_Result (Res, Se);
end Sem_As_Selected_Element;
procedure Error_Selected_Element (Prefix_Type : Iir)
is
Base_Type : Iir;
begin
Base_Type := Get_Base_Type (Prefix_Type);
if Get_Kind (Base_Type) = Iir_Kind_Access_Type_Definition then
Base_Type := Get_Base_Type (Get_Designated_Type (Base_Type));
end if;
if Get_Kind (Base_Type) /= Iir_Kind_Record_Type_Definition then
Error_Msg_Sem
(+Name, "%n does not designate a record", +Prefix);
else
Error_Msg_Sem
(+Name, "no element %i in %n", (+Suffix, +Base_Type));
end if;
end Error_Selected_Element;
procedure Sem_As_Protected_Item (Sub_Name : Iir)
is
Prot_Type : constant Iir := Get_Type (Sub_Name);
Method : Iir;
begin
-- LRM98 12.3 Visibility
-- s) For a subprogram declared immediately within a given protected
-- type declaration: at the place of the suffix in a selected
-- name whose prefix denotes an object of the protected type.
Method := Get_Declaration_Chain (Prot_Type);
while Method /= Null_Iir loop
case Get_Kind (Method) is
when Iir_Kind_Function_Declaration |
Iir_Kind_Procedure_Declaration =>
if Get_Identifier (Method) = Suffix then
Add_Result (Res, Method);
end if;
when Iir_Kind_Attribute_Specification
| Iir_Kind_Use_Clause =>
null;
when others =>
-- Declarations not allowed in protected types.
-- Just ignore them.
null;
end case;
Method := Get_Chain (Method);
end loop;
end Sem_As_Protected_Item;
procedure Error_Protected_Item (Prot_Type : Iir) is
begin
Error_Msg_Sem (+Name, "no method %i in %n", (+Suffix, +Prot_Type));
end Error_Protected_Item;
-- Check if a synopsys package can be imported.
procedure Check_Synopsys_Package (Lib : Iir)
is
use Std_Names;
begin
if Get_Identifier (Lib) /= Name_Ieee then
return;
end if;
case Suffix is
when Name_Std_Logic_Arith
| Name_Std_Logic_Signed
| Name_Std_Logic_Unsigned =>
-- Synopsys package.
null;
when Name_Std_Logic_Textio =>
if Vhdl_Std >= Vhdl_08 then
-- Standard ieee package in vhdl-08
return;
end if;
when others =>
-- Not a synopsys package.
return;
end case;
Error_Msg_Sem
(+Name, "use of synopsys package %i needs the -fsynopsys option",
+Suffix);
end Check_Synopsys_Package;
begin
-- Analyze prefix.
if Soft then
Sem_Name_Soft (Prefix_Name);
else
Sem_Name (Prefix_Name);
end if;
Prefix := Get_Named_Entity (Prefix_Name);
if Is_Error (Prefix) then
Set_Named_Entity (Name, Prefix);
return;
end if;
Res := Null_Iir;
case Get_Kind (Prefix) is
when Iir_Kind_Overload_List =>
-- LRM93 6.3
-- If, according to the visibility rules, there is at
-- least one possible interpretation of the prefix of a
-- selected name as the name of an enclosing entity
-- interface, architecture, subprogram, block statement,
-- process statement, generate statement, or loop
-- statement, then the only interpretations considered are
-- those of the immediately preceding paragraph.
--
-- In this case, the selected name is always interpreted
-- as an expanded name. In particular, no interpretations
-- of the prefix as a function call are considered.
declare
Prefix_List : Iir_List;
It : List_Iterator;
El : Iir;
begin
-- So, first try as expanded name.
Prefix_List := Get_Overload_List (Prefix);
It := List_Iterate (Prefix_List);
while Is_Valid (It) loop
El := Get_Element (It);
case Get_Kind (El) is
when Iir_Kind_Function_Call
| Iir_Kind_Selected_Element =>
-- Not an expanded name.
null;
when others =>
Sem_As_Expanded_Name (El);
end case;
Next (It);
end loop;
-- If no expanded name are found, try as selected element.
if Res = Null_Iir then
It := List_Iterate (Prefix_List);
while Is_Valid (It) loop
El := Get_Element (It);
case Get_Kind (El) is
when Iir_Kind_Procedure_Declaration =>
-- A procedure cannot be the prefix of a selected
-- element.
null;
when others =>
Sem_As_Selected_Element (El);
end case;
Next (It);
end loop;
end if;
end;
if Res = Null_Iir and then not Soft then
Error_Msg_Sem
(+Name, "no suffix %i for overloaded selected name", +Suffix);
end if;
when Iir_Kind_Library_Declaration =>
-- LRM93 6.3
-- An expanded name denotes a primary unit constained in a design
-- library if the prefix denotes the library and the suffix is the
-- simple name if a primary unit whose declaration is contained
-- in that library.
-- An expanded name is not allowed for a secondary unit,
-- particularly for an architecture body.
-- GHDL: FIXME: error message more explicit
Res := Load_Primary_Unit (Prefix, Suffix, Name);
if Res /= Null_Iir then
if not Soft and then not Flag_Synopsys then
Check_Synopsys_Package (Prefix);
end if;
Sem.Add_Dependence (Res);
Res := Get_Library_Unit (Res);
elsif not Soft then
Error_Msg_Sem
(+Name, "unit %i not found in %n", (+Suffix, +Prefix));
end if;
when Iir_Kind_Process_Statement
| Iir_Kind_Procedure_Declaration
| Iir_Kind_Sensitized_Process_Statement
| Iir_Kind_Architecture_Body
| Iir_Kind_Entity_Declaration
| Iir_Kind_Package_Declaration
| Iir_Kind_Package_Instantiation_Declaration
| Iir_Kind_Interface_Package_Declaration
| Iir_Kind_If_Generate_Statement
| Iir_Kind_For_Generate_Statement
| Iir_Kind_Block_Statement
| Iir_Kind_For_Loop_Statement =>
-- LRM93 6.3
-- An expanded name denotes a named entity declared immediatly
-- within a named construct if the prefix that is an entity
-- interface, an architecture, a subprogram, a block statement,
-- a process statement, a generate statement, or a loop
-- statement, and the suffix is the simple name, character
-- literal, or operator symbol of an named entity whose
-- declaration occurs immediatly within that construct.
if Get_Kind (Prefix) = Iir_Kind_Design_Unit then
Load_Design_Unit (Prefix, Name);
Sem.Add_Dependence (Prefix);
Prefix := Get_Library_Unit (Prefix);
-- Modified only for xrefs, since a design_unit points to
-- the first context clause, while a library unit points to
-- the identifier.
Set_Named_Entity (Get_Prefix (Name), Prefix);
end if;
Res := Find_Declarations_In_List (Prefix, Name, Keep_Alias);
if Res = Null_Iir then
if not Soft then
Error_Msg_Sem
(+Name, "no declaration for %i in %n", (+Suffix, +Prefix));
end if;
else
-- LRM93 6.3
-- This form of expanded name is only allowed within the
-- construct itself.
-- FIXME: LRM08 12.3 Visibility h)
if not Kind_In (Prefix,
Iir_Kind_Package_Declaration,
Iir_Kind_Package_Instantiation_Declaration)
and then not Get_Is_Within_Flag (Prefix)
then
if not Soft then
Error_Msg_Sem
(+Prefix_Loc,
"an expanded name is only allowed "
& "within the construct");
end if;
-- Hum, keep res.
elsif Get_Kind (Prefix) = Iir_Kind_Package_Declaration
and then not Get_Is_Within_Flag (Prefix)
and then Is_Uninstantiated_Package (Prefix)
then
-- LRM08 12.3 f) Visibility
-- For a declaration given in a package declaration, other
-- than in a package declaration that defines an
-- uninstantiated package: [...]
if not Soft then
Error_Msg_Sem
(+Prefix_Loc,
"cannot refer a declaration in an "
& "uninstantiated package");
end if;
end if;
end if;
when Iir_Kind_Function_Declaration =>
Sem_As_Expanded_Name (Prefix);
if Res = Null_Iir then
Sem_As_Selected_Element (Prefix);
end if;
if Res = Null_Iir and then not Soft then
Error_Selected_Element (Get_Return_Type (Prefix));
end if;
when Iir_Kinds_Object_Declaration
| Iir_Kind_Indexed_Name
| Iir_Kind_Selected_Element
| Iir_Kind_Dereference
| Iir_Kind_Implicit_Dereference
| Iir_Kind_Attribute_Value
| Iir_Kind_Function_Call =>
if Get_Kind (Get_Type (Prefix))
= Iir_Kind_Protected_Type_Declaration
then
Sem_As_Protected_Item (Prefix);
if Res = Null_Iir and then not Soft then
Error_Protected_Item (Prefix);
end if;
else
Sem_As_Selected_Element (Prefix);
if Res = Null_Iir and then not Soft then
Error_Selected_Element (Get_Type (Prefix));
end if;
end if;
when Iir_Kind_Type_Declaration
| Iir_Kind_Subtype_Declaration
| Iir_Kind_Concurrent_Procedure_Call_Statement
| Iir_Kind_Component_Instantiation_Statement
| Iir_Kind_Slice_Name
| Iir_Kind_Procedure_Call_Statement
| Iir_Kind_Attribute_Declaration
| Iir_Kind_Type_Conversion =>
if not Soft then
Error_Msg_Sem
(+Prefix_Loc, "%n cannot be selected by name", +Prefix);
end if;
when Iir_Kind_Error =>
-- Let's propagate the error.
null;
when others =>
Error_Kind ("sem_selected_name(2)", Prefix);
end case;
if Res = Null_Iir then
Res := Error_Mark;
end if;
Set_Named_Entity (Name, Res);
end Sem_Selected_Name;
-- Extract actuals from ASSOC_CHAIN. Report errors.
procedure Extract_Attribute_Parameters
(Assoc_Chain : Iir; Actuals : out Iir_Array)
is
Assoc : Iir;
begin
pragma Assert (Assoc_Chain /= Null_Iir);
Assoc := Assoc_Chain;
for I in Actuals'Range loop
if Assoc = Null_Iir then
Actuals (I) := Null_Iir;
else
-- Not 'open' association element ?
if Get_Kind (Assoc) /= Iir_Kind_Association_Element_By_Expression
then
Error_Msg_Sem (+Assoc, "'open' is not an attribute parameter");
Actuals (Actuals'First) := Null_Iir;
return;
end if;
-- Not an association (ie no formal) ?
if Get_Formal (Assoc) /= Null_Iir then
Error_Msg_Sem
(+Assoc, "formal not allowed for attribute parameter");
Actuals (Actuals'First) := Null_Iir;
return;
end if;
Actuals (I) := Get_Actual (Assoc);
Assoc := Get_Chain (Assoc);
end if;
end loop;
if Assoc /= Null_Iir then
Error_Msg_Sem (+Assoc, "too many parameters for the attribute");
end if;
end Extract_Attribute_Parameters;
-- If ASSOC_ASSOC has one element, which is an expression without formal,
-- return the actual, else return NULL_IIR.
function Get_One_Actual (Assoc_Chain : Iir) return Iir
is
Assoc : Iir;
begin
-- Only one actual ?
if Assoc_Chain = Null_Iir or else Get_Chain (Assoc_Chain) /= Null_Iir
then
return Null_Iir;
end if;
-- Not 'open' association element ?
Assoc := Assoc_Chain;
if Get_Kind (Assoc) /= Iir_Kind_Association_Element_By_Expression then
return Null_Iir;
end if;
-- Not an association (ie no formal) ?
if Get_Formal (Assoc) /= Null_Iir then
return Null_Iir;
end if;
return Get_Actual (Assoc);
end Get_One_Actual;
function Slice_Or_Index (Actual : Iir) return Iir_Kind is
begin
-- But it may be a slice name.
case Get_Kind (Actual) is
when Iir_Kind_Range_Array_Attribute
| Iir_Kind_Reverse_Range_Array_Attribute
| Iir_Kind_Subtype_Declaration
| Iir_Kind_Type_Declaration
| Iir_Kind_Range_Expression =>
return Iir_Kind_Slice_Name;
when others =>
if Is_Range_Attribute_Name (Actual) then
return Iir_Kind_Slice_Name;
end if;
end case;
-- By default, this is an indexed name.
return Iir_Kind_Indexed_Name;
end Slice_Or_Index;
-- Check whether association chain ASSOCS may be interpreted as indexes.
function Index_Or_Not (Assocs : Iir) return Iir_Kind
is
El : Iir;
begin
El := Assocs;
while El /= Null_Iir loop
case Get_Kind (El) is
when Iir_Kind_Association_Element_By_Expression =>
if Get_Formal (El) /= Null_Iir then
return Iir_Kind_Error;
end if;
when others =>
-- Only expression are allowed.
return Iir_Kind_Error;
end case;
El := Get_Chain (El);
end loop;
return Iir_Kind_Indexed_Name;
end Index_Or_Not;
function Sem_Index_Specification (Name : Iir_Parenthesis_Name; Itype : Iir)
return Iir
is
Actual : Iir;
Kind : Iir_Kind;
Res : Iir;
begin
-- FIXME: reuse Sem_Name for the whole analysis ?
Actual := Get_One_Actual (Get_Association_Chain (Name));
if Actual = Null_Iir then
Error_Msg_Sem (+Name, "only one index specification is allowed");
return Null_Iir;
end if;
case Get_Kind (Actual) is
when Iir_Kind_Simple_Name
| Iir_Kind_Selected_Name =>
Sem_Name (Actual);
Kind := Slice_Or_Index (Get_Named_Entity (Actual));
-- FIXME: analyze to be finished.
--Maybe_Finish_Sem_Name (Actual);
when Iir_Kind_Subtype_Definition
| Iir_Kind_Range_Expression =>
Kind := Iir_Kind_Slice_Name;
when others =>
Kind := Slice_Or_Index (Actual);
end case;
Res := Create_Iir (Kind);
Location_Copy (Res, Name);
case Kind is
when Iir_Kind_Indexed_Name =>
Actual := Sem_Expression (Actual, Itype);
if Actual = Null_Iir then
return Null_Iir;
end if;
Check_Read (Actual);
if Get_Expr_Staticness (Actual) < Globally then
Error_Msg_Sem (+Name, "index must be a static expression");
end if;
Set_Index_List (Res, Create_Iir_Flist (1));
Set_Nth_Element (Get_Index_List (Res), 0, Actual);
when Iir_Kind_Slice_Name =>
Actual := Sem_Discrete_Range (Actual, Itype, False);
if Actual = Null_Iir then
return Null_Iir;
end if;
Set_Suffix (Res, Actual);
Actual := Get_Range_From_Discrete_Range (Actual);
if Get_Expr_Staticness (Actual) < Globally then
Error_Msg_Sem (+Name, "index must be a static expression");
end if;
when others =>
raise Internal_Error;
end case;
Free_Parenthesis_Name (Name, Res);
return Res;
end Sem_Index_Specification;
procedure Sem_Parenthesis_Name (Name : Iir_Parenthesis_Name)
is
Prefix_Name : constant Iir := Get_Prefix (Name);
Prefix: Iir;
Res : Iir;
Res_Prefix : Iir;
Assoc_Chain : Iir;
Slice_Index_Kind : Iir_Kind;
-- If FINISH is TRUE, then display error message in case of error.
function Sem_As_Indexed_Or_Slice_Name (Sub_Name : Iir; Finish : Boolean)
return Iir
is
Arr_Type : Iir;
Ptr_Type : Iir;
P : Iir;
R : Iir;
begin
if Slice_Index_Kind = Iir_Kind_Error then
if Finish then
Error_Msg_Sem (+Name, "prefix is not a function name");
end if;
-- No way.
return Null_Iir;
end if;
-- Only values can be indexed or sliced.
-- Catch errors such as slice of a type conversion.
if Name_To_Value (Sub_Name) = Null_Iir
and then not Is_Function_Declaration (Sub_Name)
then
if Finish then
Error_Msg_Sem
(+Name, "prefix is not an array value (found %n)", +Sub_Name);
end if;
return Null_Iir;
end if;
-- Extract type of prefix, handle possible implicit deference.
Arr_Type := Get_Type (Sub_Name);
if Kind_In (Arr_Type, Iir_Kind_Access_Type_Definition,
Iir_Kind_Access_Subtype_Definition)
then
-- FIXME: use base type until full support of access subtypes.
Ptr_Type := Get_Base_Type (Arr_Type);
Arr_Type := Get_Designated_Type (Arr_Type);
else
Ptr_Type := Null_Iir;
end if;
if not Kind_In (Arr_Type, Iir_Kind_Array_Type_Definition,
Iir_Kind_Array_Subtype_Definition)
then
if Finish and then not Is_Error (Arr_Type) then
Error_Msg_Sem (+Name, "type of prefix is not an array");
end if;
return Null_Iir;
end if;
if Get_Nbr_Elements (Get_Index_Subtype_List (Arr_Type)) /=
Get_Chain_Length (Assoc_Chain)
then
if Finish then
Error_Msg_Sem
(+Name, "number of indexes mismatches array dimension");
end if;
return Null_Iir;
end if;
-- For indexed names, discard type incompatibilities between indexes
-- and array type indexes.
-- The FINISH = True case will be handled by Finish_Sem_Indexed_Name.
if Slice_Index_Kind = Iir_Kind_Indexed_Name and then not Finish then
declare
Type_Index_List : constant Iir_Flist :=
Get_Index_Subtype_List (Arr_Type);
Type_Index : Iir;
Assoc : Iir;
begin
Assoc := Assoc_Chain;
for I in Natural loop
-- Assoc and Type_Index_List have the same length as this
-- was checked just above.
exit when Assoc = Null_Iir;
if Get_Kind (Assoc)
/= Iir_Kind_Association_Element_By_Expression
then
return Null_Iir;
end if;
Type_Index := Get_Index_Type (Type_Index_List, I);
if Is_Expr_Compatible (Type_Index, Get_Actual (Assoc))
= Not_Compatible
then
return Null_Iir;
end if;
Assoc := Get_Chain (Assoc);
end loop;
end;
end if;
if not Maybe_Function_Call (Sub_Name) then
if Finish then
Error_Msg_Sem (+Name, "missing parameters for function call");
end if;
return Null_Iir;
end if;
P := Maybe_Insert_Function_Call (Prefix_Name, Sub_Name);
P := Maybe_Insert_Dereference (P, Ptr_Type);
R := Create_Iir (Slice_Index_Kind);
Location_Copy (R, Name);
Set_Prefix (R, P);
Set_Base_Name (R, Get_Object_Prefix (P));
case Slice_Index_Kind is
when Iir_Kind_Slice_Name =>
Set_Suffix (R, Get_Actual (Assoc_Chain));
Set_Type (R, Get_Base_Type (Get_Type (P)));
when Iir_Kind_Indexed_Name =>
declare
Idx_El : Iir;
Idx_List : Iir_List;
begin
Idx_List := Create_Iir_List;
Idx_El := Assoc_Chain;
while Idx_El /= Null_Iir loop
Append_Element (Idx_List, Get_Actual (Idx_El));
Idx_El := Get_Chain (Idx_El);
end loop;
Set_Index_List (R, List_To_Flist (Idx_List));
end;
Set_Type (R, Get_Element_Subtype (Arr_Type));
when others =>
raise Internal_Error;
end case;
return R;
end Sem_As_Indexed_Or_Slice_Name;
-- Sem parenthesis name when the prefix is a function declaration.
-- Can be either a function call (and the expression is the actual) or
-- a slice/index of the result of a call without actual.
procedure Sem_Parenthesis_Function (Sub_Name : Iir)
is
Used : Boolean;
R : Iir;
Match : Compatibility_Level;
Call : Iir;
begin
Used := False;
-- A function call.
if Is_Function_Declaration (Sub_Name) then
Sem_Association_Chain
(Get_Interface_Declaration_Chain (Sub_Name),
Assoc_Chain, False, Missing_Parameter, Name, Match);
if Match /= Not_Compatible then
Call := Sem_As_Function_Call
(Prefix_Name, Sub_Name, Assoc_Chain);
Add_Result (Res, Call);
Add_Result (Res_Prefix, Sub_Name);
Used := True;
end if;
end if;
-- A slice/index of a call (without parameters).
if not Is_Procedure_Declaration (Sub_Name) then
R := Sem_As_Indexed_Or_Slice_Name (Sub_Name, False);
if R /= Null_Iir then
Add_Result (Res, R);
Add_Result (Res_Prefix, Sub_Name);
Used := True;
end if;
end if;
if not Used then
Sem_Name_Free_Result (Sub_Name, Null_Iir);
end if;
end Sem_Parenthesis_Function;
procedure Error_Parenthesis_Function (Spec : Iir)
is
Match : Compatibility_Level;
begin
Error_Msg_Sem (+Name, "cannot match %n with actuals", +Prefix);
-- Display error message.
Sem_Association_Chain
(Get_Interface_Declaration_Chain (Spec),
Assoc_Chain, True, Missing_Parameter, Name, Match);
end Error_Parenthesis_Function;
Actual : Iir;
Actual_Expr : Iir;
begin
-- The prefix is a function name, a type mark or an array.
Sem_Name (Prefix_Name);
Prefix := Get_Named_Entity (Prefix_Name);
if Prefix = Error_Mark then
Set_Named_Entity (Name, Error_Mark);
return;
end if;
Res := Null_Iir;
Assoc_Chain := Get_Association_Chain (Name);
Actual := Get_One_Actual (Assoc_Chain);
if Kind_In (Prefix,
Iir_Kind_Type_Declaration, Iir_Kind_Subtype_Declaration)
then
-- A type conversion. The prefix is a type mark.
declare
In_Formal : Boolean;
begin
if Actual = Null_Iir then
-- More than one actual. Keep only the first.
Error_Msg_Sem
(+Name, "type conversion allows only one expression");
In_Formal := False;
else
In_Formal := Get_In_Formal_Flag (Assoc_Chain);
end if;
-- This is certainly the easiest case: the prefix is not
-- overloaded, so the result can be computed.
Set_Named_Entity
(Name, Sem_Type_Conversion (Name, Prefix, Actual, In_Formal));
end;
return;
end if;
-- Select between slice or indexed name.
Actual_Expr := Null_Iir;
if Actual /= Null_Iir then
-- Only one actual: can be a slice or an index
case Get_Kind (Actual) is
when Iir_Kinds_Name
| Iir_Kind_Attribute_Name =>
-- Maybe a discrete range name.
Sem_Name (Actual);
Actual_Expr := Get_Named_Entity (Actual);
if Actual_Expr = Error_Mark then
Set_Named_Entity (Name, Actual_Expr);
return;
end if;
-- Decides between sliced or indexed name to actual.
Slice_Index_Kind := Slice_Or_Index (Actual_Expr);
when Iir_Kind_Range_Expression
| Iir_Kind_Subtype_Definition =>
-- This can only be a slice.
Slice_Index_Kind := Iir_Kind_Slice_Name;
when others =>
-- Any other expression: an indexed name.
Slice_Index_Kind := Iir_Kind_Indexed_Name;
end case;
else
-- More than one actual: an indexed name.
-- FIXME: improve error message for multi-dim slice ?
Slice_Index_Kind := Index_Or_Not (Assoc_Chain);
end if;
-- Analyze actuals if not already done (done for slices).
if Slice_Index_Kind /= Iir_Kind_Slice_Name then
if Sem_Actual_Of_Association_Chain (Assoc_Chain) = False then
Actual := Null_Iir;
else
Actual := Get_One_Actual (Assoc_Chain);
end if;
end if;
Res_Prefix := Null_Iir;
case Get_Kind (Prefix) is
when Iir_Kind_Overload_List =>
declare
El : Iir;
Prefix_List : Iir_List;
It : List_Iterator;
begin
Prefix_List := Get_Overload_List (Prefix);
It := List_Iterate (Prefix_List);
while Is_Valid (It) loop
El := Get_Element (It);
Sem_Parenthesis_Function (El);
Next (It);
end loop;
-- Some prefixes may have been removed, replace with the
-- rebuilt prefix list.
Free_Overload_List (Prefix);
Set_Named_Entity (Prefix_Name, Res_Prefix);
end;
if Res = Null_Iir then
Error_Msg_Sem
(+Name, "no overloaded function found matching %n",
+Prefix_Name);
end if;
when Iir_Kind_Function_Declaration
| Iir_Kind_Interface_Function_Declaration =>
Sem_Parenthesis_Function (Prefix);
Set_Named_Entity (Prefix_Name, Res_Prefix);
if Res = Null_Iir then
Error_Parenthesis_Function (Prefix);
end if;
when Iir_Kinds_Object_Declaration
| Iir_Kind_Indexed_Name
| Iir_Kind_Slice_Name
| Iir_Kind_Dereference
| Iir_Kind_Implicit_Dereference
| Iir_Kind_Selected_Element
| Iir_Kind_Attribute_Value
| Iir_Kind_Simple_Name_Attribute
| Iir_Kind_Function_Call =>
Add_Result (Res, Sem_As_Indexed_Or_Slice_Name (Prefix, True));
when Iir_Kinds_Array_Attribute =>
if Actual /= Null_Iir then
Finish_Sem_Array_Attribute (Prefix_Name, Prefix, Actual);
Set_Named_Entity (Name, Prefix);
else
Error_Msg_Sem (+Name, "bad attribute parameter");
Set_Named_Entity (Name, Error_Mark);
end if;
return;
when Iir_Kinds_Scalar_Type_Attribute
| Iir_Kind_Image_Attribute
| Iir_Kind_Value_Attribute =>
if Get_Parameter (Prefix) /= Null_Iir then
-- Attribute already has a parameter, the expression
-- is either a slice or an index.
Add_Result
(Res, Sem_As_Indexed_Or_Slice_Name (Prefix, True));
elsif Actual /= Null_Iir then
Finish_Sem_Scalar_Type_Attribute (Prefix_Name, Prefix, Actual);
Set_Named_Entity (Name, Prefix);
return;
else
Error_Msg_Sem (+Name, "bad attribute parameter");
Set_Named_Entity (Name, Error_Mark);
return;
end if;
when Iir_Kind_Type_Declaration
| Iir_Kind_Subtype_Declaration =>
Error_Msg_Sem
(+Name, "subprogram name is a type mark (missing apostrophe)");
when Iir_Kind_Stable_Attribute
| Iir_Kind_Quiet_Attribute
| Iir_Kind_Delayed_Attribute =>
if Actual /= Null_Iir then
Finish_Sem_Signal_Attribute_Signal (Prefix, Actual);
Set_Named_Entity (Name, Prefix);
else
Error_Msg_Sem (+Name, "bad attribute parameter");
Set_Named_Entity (Name, Error_Mark);
end if;
return;
when Iir_Kind_Ramp_Attribute
| Iir_Kind_Quantity_Slew_Attribute
| Iir_Kind_Signal_Slew_Attribute
| Iir_Kind_Zoh_Attribute
| Iir_Kind_Ltf_Attribute
| Iir_Kind_Ztf_Attribute
| Iir_Kind_Quantity_Delayed_Attribute =>
declare
Params : Iir_Array (1 .. 4);
begin
-- Try to extract 2 actuals from the name association list.
-- Emit a message in case of error.
Extract_Attribute_Parameters (Assoc_Chain, Params);
if Params (1) /= Null_Iir then
-- If ok, finish analysis.
Finish_Sem_Quantity_Attribute (Prefix_Name, Prefix, Params);
else
Prefix := Error_Mark;
end if;
-- The meaning of the parenthesis name is the attribute (as
-- the actuals have been moved to the attribute node).
Set_Named_Entity (Name, Prefix);
return;
end;
when Iir_Kind_Above_Attribute =>
if Actual /= Null_Iir then
Finish_Sem_Quantity_Attribute
(Prefix_Name, Prefix, (1 => Actual));
else
Error_Msg_Sem (+Name, "bad attribute parameter");
Prefix := Error_Mark;
end if;
Set_Named_Entity (Name, Prefix);
return;
when Iir_Kind_Procedure_Declaration
| Iir_Kind_Interface_Procedure_Declaration =>
Error_Msg_Sem (+Name, "cannot call %n in an expression",
+Prefix);
when Iir_Kinds_Sequential_Statement
| Iir_Kinds_Concurrent_Statement
| Iir_Kind_Component_Declaration
| Iir_Kind_Type_Conversion
| Iir_Kind_Unit_Declaration
| Iir_Kind_Enumeration_Literal
| Iir_Kind_Attribute_Declaration
| Iir_Kinds_Library_Unit
| Iir_Kind_Library_Declaration
| Iir_Kinds_Type_Attribute
| Iir_Kind_Nature_Declaration
| Iir_Kind_Subnature_Declaration
| Iir_Kind_Group_Declaration
| Iir_Kind_Group_Template_Declaration =>
Error_Msg_Sem (+Name, "%n cannot be indexed or sliced", +Prefix);
Res := Null_Iir;
when Iir_Kind_Psl_Declaration
| Iir_Kind_Psl_Endpoint_Declaration =>
Res := Sem_Psl.Sem_Psl_Name (Name);
when Iir_Kind_Error =>
-- Continue with the error.
Res := Prefix;
when others =>
Error_Kind ("sem_parenthesis_name", Prefix);
end case;
if Res = Null_Iir then
Res := Error_Mark;
end if;
Set_Named_Entity (Name, Res);
end Sem_Parenthesis_Name;
procedure Sem_Selected_By_All_Name (Name : Iir_Selected_By_All_Name)
is
Prefix : Iir;
Prefix_Name : Iir;
Res : Iir;
procedure Sem_As_Selected_By_All_Name (Sub_Name : Iir)
is
Base_Type : Iir;
R, R1 : Iir;
begin
-- Only accept prefix of access type.
Base_Type := Get_Base_Type (Get_Type (Sub_Name));
if Get_Kind (Base_Type) /= Iir_Kind_Access_Type_Definition then
return;
end if;
if not Maybe_Function_Call (Sub_Name) then
return;
end if;
R1 := Maybe_Insert_Function_Call (Get_Prefix (Name), Sub_Name);
R := Create_Iir (Iir_Kind_Dereference);
Location_Copy (R, Name);
Set_Prefix (R, R1);
-- FIXME: access subtype.
Set_Type (R, Get_Designated_Type (Base_Type));
Add_Result (Res, R);
end Sem_As_Selected_By_All_Name;
begin
Prefix := Get_Prefix (Name);
Sem_Name (Prefix);
Prefix_Name := Prefix;
Prefix := Get_Named_Entity (Prefix);
if Prefix = Null_Iir then
return;
end if;
Res := Null_Iir;
case Get_Kind (Prefix) is
when Iir_Kind_Overload_List =>
declare
Prefix_List : constant Iir_List := Get_Overload_List (Prefix);
It : List_Iterator;
begin
It := List_Iterate (Prefix_List);
while Is_Valid (It) loop
Sem_As_Selected_By_All_Name (Get_Element (It));
Next (It);
end loop;
end;
when Iir_Kinds_Object_Declaration
| Iir_Kind_Selected_Element
| Iir_Kind_Dereference
| Iir_Kind_Indexed_Name
| Iir_Kind_Function_Call =>
Sem_As_Selected_By_All_Name (Prefix);
when Iir_Kind_Function_Declaration =>
Prefix := Sem_As_Function_Call (Name => Prefix_Name,
Spec => Prefix,
Assoc_Chain => Null_Iir);
Sem_As_Selected_By_All_Name (Prefix);
when Iir_Kind_Error =>
Set_Named_Entity (Name, Error_Mark);
return;
when others =>
Error_Kind ("sem_selected_by_all_name", Prefix);
end case;
if Res = Null_Iir then
Error_Msg_Sem (+Name, "prefix type is not an access type");
Res := Error_Mark;
end if;
Set_Named_Entity (Name, Res);
end Sem_Selected_By_All_Name;
function Sem_Base_Attribute (Attr : Iir_Attribute_Name) return Iir
is
Prefix_Name : Iir;
Prefix_Type : Iir;
Res : Iir;
Base_Type : Iir;
Type_Decl : Iir;
begin
Prefix_Name := Finish_Sem_Name (Get_Prefix (Attr));
Prefix_Type := Name_To_Type_Definition (Prefix_Name);
if not Is_Error (Prefix_Type) then
Base_Type := Get_Base_Type (Prefix_Type);
-- Get the first subtype. FIXME: ref?
Type_Decl := Get_Type_Declarator (Base_Type);
if Get_Kind (Type_Decl) = Iir_Kind_Anonymous_Type_Declaration then
Base_Type := Get_Subtype_Definition (Type_Decl);
end if;
else
Base_Type := Prefix_Type;
end if;
Res := Create_Iir (Iir_Kind_Base_Attribute);
Location_Copy (Res, Attr);
Set_Prefix (Res, Prefix_Name);
Set_Type (Res, Base_Type);
return Res;
end Sem_Base_Attribute;
function Sem_User_Attribute (Attr : Iir_Attribute_Name) return Iir
is
Prefix_Name : constant Iir := Get_Prefix (Attr);
Prefix : Iir;
Value : Iir;
Attr_Id : Name_Id;
begin
Prefix := Get_Named_Entity (Prefix_Name);
-- LRM93 6.6
-- If the attribute name denotes an alias, then the attribute name
-- denotes an attribute of the aliased name and not the alias itself,
-- except when the attribute designator denotes any of the predefined
-- attributes 'simple_name, 'path_name, or 'instance_name.
if Get_Kind (Prefix) = Iir_Kind_Object_Alias_Declaration then
-- GHDL: according to 4.3.3, the name cannot be an alias.
Prefix := Strip_Denoting_Name (Get_Name (Prefix));
end if;
-- LRM93 6.6
-- If the attribute designator denotes a user-defined attribute, the
-- prefix cannot denote a subelement or a slice of an object.
case Get_Kind (Prefix) is
when Iir_Kind_Selected_By_All_Name
| Iir_Kind_Selected_Name
| Iir_Kind_Indexed_Name
| Iir_Kind_Slice_Name
| Iir_Kind_Selected_Element =>
Error_Msg_Sem (+Attr, "prefix of user defined attribute cannot be "
& "an object subelement");
return Error_Mark;
when Iir_Kind_Dereference =>
Error_Msg_Sem (+Attr, "prefix of user defined attribute cannot be "
& "an anonymous object");
return Error_Mark;
when Iir_Kind_Attribute_Declaration =>
Error_Msg_Sem (+Attr, "prefix of user defined attribute cannot be "
& "an attribute");
return Error_Mark;
when Iir_Kind_Function_Call
| Iir_Kind_Type_Conversion =>
Error_Msg_Sem (+Attr, "invalid prefix for user defined attribute");
return Error_Mark;
when Iir_Kinds_Object_Declaration
| Iir_Kind_Type_Declaration
| Iir_Kind_Subtype_Declaration
| Iir_Kind_Nature_Declaration
| Iir_Kind_Subnature_Declaration
| Iir_Kind_Function_Declaration
| Iir_Kind_Procedure_Declaration
| Iir_Kind_Enumeration_Literal
| Iir_Kind_Unit_Declaration
| Iir_Kind_Component_Declaration
| Iir_Kinds_Library_Unit =>
-- FIXME: complete
null;
when Iir_Kinds_Sequential_Statement
| Iir_Kinds_Concurrent_Statement =>
-- May appear textually before the statement.
Set_Is_Forward_Ref (Prefix_Name, True);
when others =>
Error_Kind ("sem_user_attribute", Prefix);
end case;
Attr_Id := Get_Identifier (Attr);
Value := Sem_Specs.Find_Attribute_Value (Prefix, Attr_Id);
if Value = Null_Iir then
Error_Msg_Sem (+Attr, "%n was not annotated with attribute %i",
(+Prefix, +Attr_Id));
if Attr_Id = Std_Names.Name_First or Attr_Id = Std_Names.Name_Last
then
-- Nice (?) message for Ada users.
Error_Msg_Sem
(+Attr, "(you may use 'high, 'low, 'left or 'right attribute)");
end if;
return Error_Mark;
end if;
Xref_Ref (Attr, Value);
if Get_Static_Attribute_Flag (Get_Attribute_Specification (Value))
and then not Get_Is_Within_Flag (Prefix)
and then Get_Expr_Staticness (Value) /= Locally
then
Error_Msg_Sem
(+Attr, "non-locally static attribute cannot be referenced here");
return Error_Mark;
end if;
return Value;
end Sem_User_Attribute;
-- The prefix of scalar type attributes is a type name (or 'base), and
-- therefore isn't overloadable. So at the end of the function, the
-- analyze is finished.
function Sem_Scalar_Type_Attribute (Attr : Iir_Attribute_Name)
return Iir
is
use Std_Names;
Prefix_Name : constant Iir := Get_Prefix (Attr);
Id : constant Name_Id := Get_Identifier (Attr);
Prefix_Type : Iir;
Res : Iir;
begin
-- LRM93 14.1
-- Prefix: Any discrete or physical type of subtype T.
Prefix_Type :=
Name_To_Type_Definition (Name_To_Analyzed_Name (Prefix_Name));
Set_Type (Prefix_Name, Prefix_Type);
if Is_Error (Prefix_Type) then
--Error_Msg_Sem
--(+Attr, "prefix of %i attribute must be a type", +Id);
return Error_Mark;
end if;
case Id is
when Name_Image
| Name_Value =>
if Get_Kind (Prefix_Type)
not in Iir_Kinds_Scalar_Type_And_Subtype_Definition
then
Report_Start_Group;
Error_Msg_Sem
(+Attr, "prefix of %i attribute must be a scalar type", +Id);
Error_Msg_Sem
(+Attr, "found %n defined at %l",
(+Prefix_Type, +Prefix_Type));
Report_End_Group;
return Error_Mark;
end if;
when others =>
case Get_Kind (Prefix_Type) is
when Iir_Kinds_Discrete_Type_Definition
| Iir_Kind_Physical_Subtype_Definition
| Iir_Kind_Physical_Type_Definition =>
null;
when others =>
Report_Start_Group;
Error_Msg_Sem
(+Attr, "prefix of %i"
& " attribute must be discrete or physical type", +Id);
Error_Msg_Sem
(+Attr, "found %n defined at %l",
(+Prefix_Type, +Prefix_Type));
Report_End_Group;
return Error_Mark;
end case;
end case;
-- Create the resulting node.
case Get_Identifier (Attr) is
when Name_Pos =>
Res := Create_Iir (Iir_Kind_Pos_Attribute);
when Name_Val =>
Res := Create_Iir (Iir_Kind_Val_Attribute);
when Name_Succ =>
Res := Create_Iir (Iir_Kind_Succ_Attribute);
when Name_Pred =>
Res := Create_Iir (Iir_Kind_Pred_Attribute);
when Name_Leftof =>
Res := Create_Iir (Iir_Kind_Leftof_Attribute);
when Name_Rightof =>
Res := Create_Iir (Iir_Kind_Rightof_Attribute);
when Name_Image =>
Res := Create_Iir (Iir_Kind_Image_Attribute);
when Name_Value =>
Res := Create_Iir (Iir_Kind_Value_Attribute);
when others =>
raise Internal_Error;
end case;
Location_Copy (Res, Attr);
Set_Prefix (Res, Prefix_Name);
Set_Base_Name (Res, Res);
case Get_Identifier (Attr) is
when Name_Pos =>
-- LRM93 14.1
-- Result type: universal_integer.
Set_Type (Res, Convertible_Integer_Type_Definition);
when Name_Val =>
-- LRM93 14.1
-- Result type: the base type of T
Set_Type (Res, Get_Base_Type (Prefix_Type));
when Name_Succ
| Name_Pred
| Name_Leftof
| Name_Rightof =>
-- LRM93 14.1
-- Result type: the base type of T.
Set_Type (Res, Get_Base_Type (Prefix_Type));
when Name_Image =>
-- LRM93 14.1
-- Result type: type string
Set_Type (Res, String_Type_Definition);
when Name_Value =>
-- LRM93 14.1
-- Result type: the base type of T.
Set_Type (Res, Get_Base_Type (Prefix_Type));
when others =>
raise Internal_Error;
end case;
return Res;
end Sem_Scalar_Type_Attribute;
-- Analyze attributes whose prefix is a type or a subtype and result is
-- a value (not a function).
function Sem_Predefined_Type_Attribute (Attr : Iir_Attribute_Name)
return Iir
is
use Std_Names;
Prefix_Name : constant Iir := Get_Prefix (Attr);
Id : constant Name_Id := Get_Identifier (Attr);
Res : Iir;
Prefix : Iir;
Prefix_Type : Iir;
begin
case Id is
when Name_Left =>
Res := Create_Iir (Iir_Kind_Left_Type_Attribute);
when Name_Right =>
Res := Create_Iir (Iir_Kind_Right_Type_Attribute);
when Name_High =>
Res := Create_Iir (Iir_Kind_High_Type_Attribute);
when Name_Low =>
Res := Create_Iir (Iir_Kind_Low_Type_Attribute);
when Name_Ascending =>
Res := Create_Iir (Iir_Kind_Ascending_Type_Attribute);
when Name_Range
| Name_Reverse_Range =>
Error_Msg_Sem
(+Attr,
"prefix of range attribute must be an array type or object");
return Error_Mark;
when others =>
Error_Msg_Sem (+Attr, "attribute %i not valid on this type", +Id);
return Error_Mark;
end case;
Location_Copy (Res, Attr);
Set_Base_Name (Res, Res);
Prefix := Get_Named_Entity (Prefix_Name);
case Get_Kind (Prefix) is
when Iir_Kind_Range_Array_Attribute
| Iir_Kind_Reverse_Range_Array_Attribute =>
Prefix := Finish_Sem_Name (Prefix_Name, Prefix);
Prefix_Type := Get_Type (Prefix);
Set_Expr_Staticness (Res, Get_Expr_Staticness (Prefix));
when Iir_Kind_Base_Attribute =>
-- Base_Attribute is already finished.
pragma Assert (Get_Kind (Prefix_Name) = Iir_Kind_Attribute_Name);
Free_Iir (Prefix_Name);
Prefix_Type := Get_Type (Prefix);
Set_Expr_Staticness (Res, Get_Type_Staticness (Prefix_Type));
when others =>
Prefix := Sem_Type_Mark (Prefix_Name);
Prefix_Type := Get_Type (Prefix);
Set_Expr_Staticness (Res, Get_Type_Staticness (Prefix_Type));
end case;
Set_Prefix (Res, Prefix);
case Get_Identifier (Attr) is
when Name_Ascending =>
-- LRM93 14.1
-- Result Type: type boolean.
Set_Type (Res, Boolean_Type_Definition);
when others =>
-- LRM 14.1
-- Result Type: Same type as T.
Set_Type (Res, Prefix_Type);
end case;
return Res;
end Sem_Predefined_Type_Attribute;
-- Called for attributes Length, Left, Right, High, Low, Range,
-- Reverse_Range, Ascending.
-- FIXME: handle overload
function Sem_Array_Attribute_Name (Attr : Iir_Attribute_Name) return Iir
is
use Std_Names;
Prefix_Name : constant Iir := Get_Prefix (Attr);
Prefix_Type : Iir;
Prefix : Iir;
Res : Iir;
Res_Type : Iir;
begin
Prefix := Get_Named_Entity (Prefix_Name);
-- LRM93 14.1
-- Prefix: Any prefix A that is appropriate for an array object, or an
-- alias thereof, or that denotes a constrained array subtype.
--
-- LRM08 16.2 Predefined attributes.
-- Prefix of A'Left[(N)], A'Right[(N)]... :
-- Any prefix A that is appropriate for an array object, or an alias
-- thereof, or that denotes a constrained an array subtype whose index
-- ranges are defined by a constraint.
--
-- GHDL: the prefix cannot be a function call, as the result is not
-- an object and it doesn't denote a subtype. References are:
--
-- LRM08 6.4 Objects:
-- An object is a named entity [...]
-- In addition the following are objects, but are not named
-- entities[...]
--
-- LRM08 6 Declarations
-- the name is said to denote the associated entity.
case Get_Kind (Prefix) is
when Iir_Kind_Dereference
| Iir_Kinds_Object_Declaration
| Iir_Kind_Function_Call
| Iir_Kind_Function_Declaration
| Iir_Kind_Selected_Element
| Iir_Kind_Indexed_Name
| Iir_Kind_Slice_Name
| Iir_Kind_Attribute_Value
| Iir_Kind_Image_Attribute =>
-- FIXME: list of expr.
Prefix_Type := Get_Type (Prefix);
case Get_Kind (Prefix_Type) is
when Iir_Kind_Access_Type_Definition
| Iir_Kind_Access_Subtype_Definition =>
declare
Designated_Type : Iir;
begin
Designated_Type :=
Get_Designated_Type (Get_Base_Type (Prefix_Type));
Prefix := Insert_Implicit_Dereference (Prefix, Attr);
Prefix_Type := Designated_Type;
end;
when Iir_Kinds_Array_Type_Definition =>
null;
when others =>
Error_Msg_Sem (+Attr, "object prefix must be an array");
return Error_Mark;
end case;
when Iir_Kind_Subtype_Declaration
| Iir_Kind_Type_Declaration
| Iir_Kind_Base_Attribute
| Iir_Kind_Subtype_Attribute
| Iir_Kind_Element_Attribute =>
Prefix_Type := Get_Type (Prefix);
if not Is_Fully_Constrained_Type (Prefix_Type) then
Error_Msg_Sem (+Attr, "prefix type is not constrained");
-- We continue using the unconstrained array type.
-- At least, this type is valid; and even if the array was
-- constrained, the base type would be the same.
end if;
when Iir_Kind_Range_Array_Attribute
| Iir_Kind_Reverse_Range_Array_Attribute =>
-- For names such as pfx'Range'Left.
-- Finish_Sem_Array_Attribute (Prefix_Name, Prefix, Null_Iir);
Prefix_Type := Get_Type (Prefix);
when Iir_Kind_Process_Statement =>
Error_Msg_Sem
(+Attr, "%n is not an appropriate prefix for %i attribute",
(+Prefix, +Attr));
return Error_Mark;
when others =>
Error_Msg_Sem
(+Attr, "prefix must denote an array object or type");
return Error_Mark;
end case;
case Get_Kind (Prefix_Type) is
when Iir_Kinds_Scalar_Type_And_Subtype_Definition =>
-- Note: prefix is a scalar type or subtype.
return Sem_Predefined_Type_Attribute (Attr);
when Iir_Kinds_Array_Type_Definition =>
null;
when others =>
Error_Msg_Sem (+Attr, "prefix of %i attribute must denote a "
& "constrained array subtype", +Attr);
return Error_Mark;
end case;
-- Type of the attribute. This is correct unless there is a parameter,
-- and furthermore 'range and 'reverse_range has to be handled
-- specially because the result is a range and not a value.
Res_Type := Get_Index_Type (Get_Index_Subtype_List (Prefix_Type), 0);
-- Create the node for the attribute.
case Get_Identifier (Attr) is
when Name_Left =>
Res := Create_Iir (Iir_Kind_Left_Array_Attribute);
when Name_Right =>
Res := Create_Iir (Iir_Kind_Right_Array_Attribute);
when Name_High =>
Res := Create_Iir (Iir_Kind_High_Array_Attribute);
when Name_Low =>
Res := Create_Iir (Iir_Kind_Low_Array_Attribute);
when Name_Range =>
Res := Create_Iir (Iir_Kind_Range_Array_Attribute);
when Name_Reverse_Range =>
Res := Create_Iir (Iir_Kind_Reverse_Range_Array_Attribute);
when Name_Length =>
Res := Create_Iir (Iir_Kind_Length_Array_Attribute);
-- FIXME: Error if ambiguous
Res_Type := Convertible_Integer_Type_Definition;
when Name_Ascending =>
Res := Create_Iir (Iir_Kind_Ascending_Array_Attribute);
-- FIXME: Error if ambiguous
Res_Type := Boolean_Type_Definition;
when others =>
raise Internal_Error;
end case;
Location_Copy (Res, Attr);
Set_Prefix (Res, Prefix);
Set_Type (Res, Res_Type);
return Res;
end Sem_Array_Attribute_Name;
-- For 'Subtype
function Sem_Subtype_Attribute (Attr : Iir_Attribute_Name) return Iir
is
Prefix_Name : Iir;
Attr_Type : Iir;
Res : Iir;
begin
Prefix_Name := Get_Prefix (Attr);
Prefix_Name := Finish_Sem_Name (Prefix_Name);
Set_Prefix (Attr, Prefix_Name);
-- LRM08 16.2 Predefined attributes
-- Prefix: Any prefix O that is appropriate for an object, or an alias
-- thereof
if (Get_Kind (Get_Base_Name (Prefix_Name))
not in Iir_Kinds_Object_Declaration)
then
Error_Msg_Sem (+Attr, "prefix must denote an object");
return Error_Mark;
end if;
-- The type defined by 'subtype is always constrained. Create
-- a subtype if it is not.
Attr_Type := Get_Type (Prefix_Name);
if False and not Is_Fully_Constrained_Type (Attr_Type) then
Attr_Type := Sem_Types.Build_Constrained_Subtype (Attr_Type, Attr);
end if;
Res := Create_Iir (Iir_Kind_Subtype_Attribute);
Location_Copy (Res, Attr);
Set_Prefix (Res, Prefix_Name);
Set_Type (Res, Attr_Type);
Set_Base_Name (Res, Res);
Set_Name_Staticness (Res, Get_Name_Staticness (Prefix_Name));
Set_Type_Staticness (Res, Get_Type_Staticness (Attr_Type));
return Res;
end Sem_Subtype_Attribute;
-- For 'Across or 'Through
function Sem_Nature_Type_Attribute (Attr : Iir_Attribute_Name) return Iir
is
Prefix_Name : constant Iir := Get_Prefix (Attr);
Prefix : Iir;
Prefix_Nature : Iir;
Res : Iir;
Attr_Type : Iir;
begin
Prefix := Get_Named_Entity (Prefix_Name);
-- LRM08 16.2 Predefined attributes
-- Prefix: Any nature or subnature N.
case Get_Kind (Prefix) is
when Iir_Kind_Nature_Declaration
| Iir_Kind_Subnature_Declaration =>
null;
when others =>
Error_Msg_Sem (+Attr, "prefix must denote a nature");
return Error_Mark;
end case;
Prefix_Nature := Get_Nature (Prefix);
case Get_Identifier (Attr) is
when Std_Names.Name_Across =>
Res := Create_Iir (Iir_Kind_Across_Attribute);
Attr_Type := Get_Across_Type (Prefix_Nature);
when Std_Names.Name_Through =>
Res := Create_Iir (Iir_Kind_Through_Attribute);
Attr_Type := Get_Across_Type (Prefix_Nature);
when others =>
raise Internal_Error;
end case;
pragma Assert (Attr_Type /= Null_Iir);
Location_Copy (Res, Attr);
Set_Prefix (Res, Prefix);
Set_Type (Res, Attr_Type);
Set_Base_Name (Res, Get_Base_Name (Prefix_Name));
Set_Name_Staticness (Res, Get_Name_Staticness (Prefix_Name));
Set_Type_Staticness (Res, Get_Type_Staticness (Attr_Type));
return Res;
end Sem_Nature_Type_Attribute;
-- For 'Reference
function Sem_Nature_Reference_Attribute (Attr : Iir_Attribute_Name)
return Iir
is
Prefix_Name : constant Iir := Get_Prefix (Attr);
Prefix : Iir;
Res : Iir;
begin
Prefix := Get_Named_Entity (Prefix_Name);
-- AMS-LRM17 16.2.6 Predefined analog attributes
-- Prefix: Any nature of subnature N.
case Get_Kind (Prefix) is
when Iir_Kind_Nature_Declaration
| Iir_Kind_Subnature_Declaration =>
null;
when others =>
Error_Msg_Sem (+Attr, "prefix must denote a nature");
return Error_Mark;
end case;
Res := Create_Iir (Iir_Kind_Nature_Reference_Attribute);
Location_Copy (Res, Attr);
Set_Prefix (Res, Prefix);
Set_Nature (Res, Get_Nature (Prefix));
Set_Base_Name (Res, Get_Base_Name (Prefix_Name));
Set_Name_Staticness (Res, Get_Name_Staticness (Prefix_Name));
return Res;
end Sem_Nature_Reference_Attribute;
function Sem_Quantity_Attribute (Attr : Iir_Attribute_Name) return Iir
is
use Std_Names;
Name_Prefix : constant Iir := Get_Prefix (Attr);
Prefix: Iir;
Res : Iir;
Res_Type : Iir;
begin
Prefix := Get_Named_Entity (Name_Prefix);
Prefix := Finish_Sem_Name_1 (Name_Prefix, Prefix);
if not Is_Quantity_Name (Prefix) then
Error_Msg_Sem
(+Attr, "prefix of %i attribute must denote a quantity", +Attr);
end if;
Res_Type := Get_Type (Prefix);
case Get_Identifier (Attr) is
when Name_Above =>
Res := Create_Iir (Iir_Kind_Above_Attribute);
Res_Type := Boolean_Type_Definition;
when Name_Dot =>
Res := Create_Iir (Iir_Kind_Dot_Attribute);
when Name_Integ =>
Res := Create_Iir (Iir_Kind_Integ_Attribute);
when Name_Zoh =>
Res := Create_Iir (Iir_Kind_Zoh_Attribute);
when Name_Ltf =>
Res := Create_Iir (Iir_Kind_Ltf_Attribute);
when Name_Ztf =>
Res := Create_Iir (Iir_Kind_Ztf_Attribute);
when Name_Delayed =>
Res := Create_Iir (Iir_Kind_Quantity_Delayed_Attribute);
when others =>
-- Not yet implemented attribute, or really an internal error.
raise Internal_Error;
end case;
Location_Copy (Res, Attr);
Set_Prefix (Res, Prefix);
Set_Type (Res, Res_Type);
-- AMS-LRM17 16.2.6 Predefined analog an mixed-signal attributes
-- Prefix: Any quantity denoted by the static name Q.
if Get_Name_Staticness (Prefix) < Globally then
Error_Msg_Sem
(+Res, "prefix of %i attribute must be a static name", +Res);
end if;
-- According to LRM 7.4, signal attributes are not static expressions
-- since the prefix (a signal) is not a static expression.
Set_Expr_Staticness (Res, None);
-- AMS-LRM17 8.1 Names
-- A name is said to be a static name if and only if one of the
-- following conditions holds:
-- [...]
-- - The name is an attribute whose prefix is a static quantity name
-- and whose suffix is one of the predefined attributes 'ABOVE, 'DOT,
-- 'INTEG, 'DELAYED, 'SLEW, 'LTF, 'ZOH, or 'ZTF.
Set_Name_Staticness (Res, Globally);
return Res;
end Sem_Quantity_Attribute;
function Sem_Slew_Attribute (Attr : Iir_Attribute_Name) return Iir
is
Prefix_Name : constant Iir := Get_Prefix (Attr);
Prefix: Iir;
Res : Iir;
Res_Type : Iir;
begin
Prefix := Get_Named_Entity (Prefix_Name);
if Is_Quantity_Name (Prefix) then
Res := Create_Iir (Iir_Kind_Quantity_Slew_Attribute);
elsif Is_Signal_Name (Prefix) then
Res := Create_Iir (Iir_Kind_Signal_Slew_Attribute);
else
Error_Msg_Sem
(+Attr,
"prefix of 'slew must denote a quantity or a signal", +Attr);
return Error_Mark;
end if;
-- AMS-VHDL17 16.2.6
-- Prefix: Any signal denoted by the static name S whose scalar
-- subelements are of a floating-point type.
--
-- GHDL: not necessary when the prefix is a quantity.
Res_Type := Get_Type (Prefix);
if not Sem_Types.Is_Nature_Type (Res_Type) then
Error_Msg_Sem (+Attr, "prefix of 'slew must be of nature type");
end if;
if Get_Name_Staticness (Prefix) < Globally then
Error_Msg_Sem (+Attr, "prefix of 'slew must be a static name");
end if;
Set_Type (Res, Res_Type);
Location_Copy (Res, Attr);
Set_Prefix (Res, Prefix);
Set_Expr_Staticness (Res, None);
-- AMS-LRM17 8.1 Names
-- A name is said to be a static name if and only if one of the
-- following conditions holds:
-- [...]
-- - The name is an attribute whose prefix is a static quantity name
-- and whose suffix is one of the predefined attributes 'ABOVE, 'DOT,
-- 'INTEG, 'DELAYED, 'SLEW, 'LTF, 'ZOH, or 'ZTF.
Set_Name_Staticness (Res, Globally);
return Res;
end Sem_Slew_Attribute;
function Sem_Signal_Signal_Attribute
(Attr : Iir_Attribute_Name; Kind : Iir_Kind)
return Iir
is
Res : Iir;
Prefix : Iir;
begin
Prefix := Get_Named_Entity (Get_Prefix (Attr));
-- Create the proper signal attribute node.
Res := Create_Iir (Kind);
Location_Copy (Res, Attr);
if Kind = Iir_Kind_Delayed_Attribute then
Set_Type (Res, Get_Type (Prefix));
elsif Kind = Iir_Kind_Transaction_Attribute then
Set_Type (Res, Bit_Type_Definition);
else
Set_Type (Res, Boolean_Type_Definition);
end if;
Set_Base_Name (Res, Res);
if Get_Kind (Prefix) = Iir_Kind_Interface_Signal_Declaration then
-- LRM93 2.1.1.2 / LRM08 4.2.2.3
--
-- It is an error if signal-valued attributes 'STABLE , 'QUIET,
-- 'TRANSACTION, and 'DELAYED of formal signal paramaters of any
-- mode are read within a subprogram.
case Get_Kind (Get_Parent (Prefix)) is
when Iir_Kind_Function_Declaration
| Iir_Kind_Procedure_Declaration =>
Error_Msg_Sem
(+Attr, "%i is not allowed for a signal parameter", +Attr);
when others =>
null;
end case;
end if;
-- Add a declaration for it.
Sem_Decls.Add_Declaration_For_Implicit_Signal (Res);
return Res;
end Sem_Signal_Signal_Attribute;
function Sem_Signal_Attribute (Attr : Iir_Attribute_Name) return Iir
is
use Std_Names;
Id : constant Name_Id := Get_Identifier (Attr);
Prefix: Iir;
Res : Iir;
Base : Iir;
begin
Prefix := Get_Named_Entity (Get_Prefix (Attr));
Base := Get_Object_Prefix (Prefix);
if AMS_Vhdl
and then Id = Name_Delayed
and then Is_Quantity_Name (Base)
then
return Sem_Quantity_Attribute (Attr);
end if;
case Get_Kind (Base) is
when Iir_Kind_Signal_Declaration
| Iir_Kind_Interface_Signal_Declaration
| Iir_Kind_Guard_Signal_Declaration
| Iir_Kinds_Signal_Attribute =>
null;
when others =>
Error_Msg_Sem
(+Attr, "prefix of %i attribute must denote a signal", +Attr);
return Error_Mark;
end case;
case Id is
when Name_Stable =>
Res := Sem_Signal_Signal_Attribute
(Attr, Iir_Kind_Stable_Attribute);
when Name_Quiet =>
Res := Sem_Signal_Signal_Attribute
(Attr, Iir_Kind_Quiet_Attribute);
when Name_Delayed =>
Res := Sem_Signal_Signal_Attribute
(Attr, Iir_Kind_Delayed_Attribute);
when Name_Transaction =>
Res := Sem_Signal_Signal_Attribute
(Attr, Iir_Kind_Transaction_Attribute);
when Name_Event =>
Res := Create_Iir (Iir_Kind_Event_Attribute);
Set_Type (Res, Boolean_Type_Definition);
when Name_Active =>
Res := Create_Iir (Iir_Kind_Active_Attribute);
Set_Type (Res, Boolean_Type_Definition);
when Name_Last_Value =>
Res := Create_Iir (Iir_Kind_Last_Value_Attribute);
Set_Type (Res, Get_Type (Prefix));
when Name_Last_Event =>
Res := Create_Iir (Iir_Kind_Last_Event_Attribute);
Set_Type (Res, Time_Type_Definition);
when Name_Last_Active =>
Res := Create_Iir (Iir_Kind_Last_Active_Attribute);
Set_Type (Res, Time_Type_Definition);
when Name_Driving_Value =>
Res := Create_Iir (Iir_Kind_Driving_Value_Attribute);
Set_Type (Res, Get_Type (Prefix));
-- FIXME: check restrictions.
when Name_Driving =>
Res := Create_Iir (Iir_Kind_Driving_Attribute);
Set_Type (Res, Boolean_Type_Definition);
-- FIXME: check restrictions.
when Name_Ramp =>
Res := Create_Iir (Iir_Kind_Ramp_Attribute);
Set_Type (Res, Get_Type (Prefix));
when others =>
-- Not yet implemented attribute, or really an internal error.
raise Internal_Error;
end case;
Location_Copy (Res, Attr);
-- LRM 4.3.2
-- The value of an object is said to be read when one of the following
-- conditions is satisfied:
-- [...]
-- * When the object is a signal and the value of any of its predefined
-- attributes 'STABLE, 'QUIET, 'DELAYED, 'TRANSACTION, 'EVENT,
-- 'ACTIVE, 'LAST_EVENT, 'LAST_ACTIVE, or 'LAST_VALUE is read.
-- LRM 14.1
-- S'Driving Restrictions:
-- S'Driving_Value Restrictions:
-- This attribute is available only from within a process, a
-- concurrent statement with an equivalent process, or a subprogram.
-- If the prefix denotes a port, it is an error if the port does not
-- have a mode of INOUT, OUT or BUFFER. It is also an error if the
-- attribute name appears in a subprogram body that is not a declarative
-- item contained within a process statement and the prefix is not a
-- formal parameter of the given subprogram or of a parent of that
-- subprogram. Finally, it is an error if the prefix denotes a
-- subprogram formal parameter whose mode is not INOUT or OUT, or if
-- S'Driving is False at the time of the evaluation of S'Driving_Value.
case Get_Kind (Res) is
when Iir_Kind_Stable_Attribute
| Iir_Kind_Quiet_Attribute
| Iir_Kind_Delayed_Attribute
| Iir_Kind_Transaction_Attribute
| Iir_Kind_Event_Attribute
| Iir_Kind_Active_Attribute
| Iir_Kind_Last_Event_Attribute
| Iir_Kind_Last_Active_Attribute
| Iir_Kind_Last_Value_Attribute =>
Check_Read (Prefix);
when Iir_Kind_Driving_Attribute
| Iir_Kind_Driving_Value_Attribute =>
-- FIXME: complete checks.
if Get_Current_Concurrent_Statement = Null_Iir then
Error_Msg_Sem
(+Attr, "'driving or 'driving_value is available only "
& "within a concurrent statement");
else
case Get_Kind (Get_Current_Concurrent_Statement) is
when Iir_Kinds_Process_Statement
| Iir_Kind_Concurrent_Conditional_Signal_Assignment
| Iir_Kind_Concurrent_Selected_Signal_Assignment
| Iir_Kind_Concurrent_Procedure_Call_Statement =>
null;
when others =>
Error_Msg_Sem
(+Attr, "'driving or 'driving_value not available "
& "within this concurrent statement");
end case;
end if;
case Get_Kind (Base) is
when Iir_Kind_Signal_Declaration =>
null;
when Iir_Kind_Interface_Signal_Declaration =>
case Get_Mode (Base) is
when Iir_Buffer_Mode
| Iir_Inout_Mode
| Iir_Out_Mode =>
null;
when others =>
Error_Msg_Sem
(+Attr, "mode of 'driving or 'driving_value prefix "
& "must be out, inout or buffer");
end case;
when others =>
Error_Msg_Sem
(+Attr, "bad prefix for 'driving or 'driving_value");
end case;
when Iir_Kind_Ramp_Attribute =>
null;
when others =>
null;
end case;
Set_Prefix (Res, Prefix);
-- Set has_active_flag when activity is read.
case Get_Kind (Res) is
when Iir_Kind_Quiet_Attribute
| Iir_Kind_Transaction_Attribute
| Iir_Kind_Active_Attribute
| Iir_Kind_Last_Active_Attribute =>
Set_Has_Active_Flag (Base, True);
when others =>
null;
end case;
return Res;
end Sem_Signal_Attribute;
-- 'Simple_name, 'instance_name and 'path_name.
function Sem_Name_Attribute (Attr : Iir_Attribute_Name) return Iir
is
use Std_Names;
Prefix_Name : constant Iir := Get_Prefix (Attr);
Prefix: Iir;
Res : Iir;
Attr_Type : Iir;
begin
Prefix := Get_Named_Entity (Prefix_Name);
Set_Prefix (Attr, Finish_Sem_Name (Prefix_Name, Prefix));
-- LRM 14.1 Predefined attributes
-- E'SIMPLE_NAME
-- Prefix: Any named entity as defined in 5.1
-- E'INSTANCE_NAME
-- Prefix: Any named entity other than the local ports and generics
-- of a component declaration.
-- E'PATH_NAME
-- Prefix: Any named entity other than the local ports and generics
-- of a component declaration.
case Get_Kind (Prefix) is
when Iir_Kind_Procedure_Declaration
| Iir_Kind_Function_Declaration
| Iir_Kind_Type_Declaration
| Iir_Kind_Subtype_Declaration
| Iir_Kind_Constant_Declaration
| Iir_Kind_Signal_Declaration
| Iir_Kind_Variable_Declaration
| Iir_Kind_Interface_Variable_Declaration
| Iir_Kind_Iterator_Declaration
| Iir_Kind_Component_Declaration
| Iir_Kinds_Concurrent_Statement
| Iir_Kinds_Sequential_Statement
| Iir_Kind_Enumeration_Literal
| Iir_Kind_Group_Declaration
| Iir_Kind_Group_Template_Declaration
| Iir_Kind_File_Declaration
| Iir_Kinds_Library_Unit
| Iir_Kind_Non_Object_Alias_Declaration =>
null;
when Iir_Kind_Interface_Signal_Declaration
| Iir_Kind_Interface_Constant_Declaration =>
if Get_Identifier (Attr) /= Name_Simple_Name
and then Get_Kind (Get_Parent (Prefix))
= Iir_Kind_Component_Declaration
then
Error_Msg_Sem
(+Attr,
"local ports or generics of a component cannot be a prefix");
end if;
when Iir_Kind_Subtype_Attribute
| Iir_Kind_Base_Attribute =>
declare
Atype : constant Iir := Get_Type (Prefix);
begin
if Is_Anonymous_Type_Definition (Atype) then
Error_Msg_Sem (+Attr, "%n is not a named entity", +Prefix);
return Create_Error_Expr (Attr, String_Type_Definition);
end if;
Prefix := Get_Type_Declarator (Atype);
end;
when others =>
Error_Msg_Sem (+Attr, "%n is not a named entity", +Prefix);
return Create_Error_Expr (Attr, String_Type_Definition);
end case;
case Get_Identifier (Attr) is
when Name_Simple_Name =>
declare
Id : constant Name_Id := Name_Table.Get_Identifier
(Eval_Simple_Name (Get_Identifier (Prefix)));
begin
Res := Create_Iir (Iir_Kind_Simple_Name_Attribute);
Set_Simple_Name_Identifier (Res, Id);
Attr_Type := Create_Unidim_Array_By_Length
(String_Type_Definition,
Int64 (Name_Table.Get_Name_Length (Id)),
Attr);
Set_Simple_Name_Subtype (Res, Attr_Type);
Set_Expr_Staticness (Res, Locally);
end;
when Name_Path_Name =>
Res := Create_Iir (Iir_Kind_Path_Name_Attribute);
Set_Expr_Staticness (Res, Globally);
Attr_Type := String_Type_Definition;
when Name_Instance_Name =>
Res := Create_Iir (Iir_Kind_Instance_Name_Attribute);
Set_Expr_Staticness (Res, Globally);
Attr_Type := String_Type_Definition;
when others =>
raise Internal_Error;
end case;
Location_Copy (Res, Attr);
Set_Prefix (Res, Prefix_Name);
Set_Type (Res, Attr_Type);
return Res;
end Sem_Name_Attribute;
procedure Sem_Attribute_Name (Attr : Iir_Attribute_Name)
is
use Std_Names;
Prefix : Iir;
Res : Iir;
Sig : Iir_Signature;
begin
-- LRM93 6.6 Attribute names
-- The meaning of the prefix of an attribute name must be determinable
-- independently of the attribute designator and independently of the
-- fact that it is the prefix of an attribute.
Prefix := Get_Prefix (Attr);
-- LRM93 6.6
-- If the prefix of an attribute name denotes an alias, then the
-- attribute name denotes an attribute of the aliased name and not the
-- alias itself, except when the attribute designator denotes any of
-- the predefined attributes 'Simple_Name, 'Path_Name or 'Instance_Name.
-- If the prefix of an attribute name denotes an alias and the
-- attribute designator denotes any of the predefined attributes
-- 'Simple_Name, 'Path_Name or 'Instance_Name, then the attribute name
-- denotes the attribute of the alias and not of the aliased name.
if Flags.Vhdl_Std > Vhdl_87
and then Get_Identifier (Attr) in Name_Id_Name_Attributes
then
Sem_Name (Prefix, True);
else
Sem_Name (Prefix, False);
end if;
Prefix := Get_Named_Entity (Prefix);
if Prefix = Error_Mark then
Set_Named_Entity (Attr, Prefix);
return;
end if;
-- LRM93 6.6
-- A signature may follow the prefix if and only if the prefix denotes
-- a subprogram or enumeration literal, or an alias thereof.
-- In this case, the signature is required to match (see Section 2.3.2)
-- the parameter and result type profile of exactly one visible
-- subprogram or enumeration literal, as is appropriate to the prefix.
-- GHDL: this is done by Sem_Signature.
Sig := Get_Attribute_Signature (Attr);
if Sig /= Null_Iir then
Prefix := Sem_Signature (Prefix, Sig);
if Prefix = Null_Iir then
Set_Named_Entity (Attr, Error_Mark);
return;
end if;
Set_Named_Entity (Get_Prefix (Attr), Prefix);
end if;
if Get_Kind (Prefix) = Iir_Kind_Overload_List then
-- FIXME: this should be allowed.
Error_Msg_Sem (+Attr, "prefix of attribute is overloaded");
Set_Named_Entity (Attr, Error_Mark);
return;
end if;
-- Set_Prefix (Attr, Finish_Sem_Name (Get_Prefix (Attr), Prefix));
case Get_Identifier (Attr) is
when Name_Base =>
Res := Sem_Base_Attribute (Attr);
when Name_Image
| Name_Value =>
if Flags.Vhdl_Std > Vhdl_87 then
Res := Sem_Scalar_Type_Attribute (Attr);
else
Res := Sem_User_Attribute (Attr);
end if;
when Name_Pos
| Name_Val
| Name_Succ
| Name_Pred
| Name_Rightof
| Name_Leftof =>
Res := Sem_Scalar_Type_Attribute (Attr);
when Name_Length
| Name_Left
| Name_Right
| Name_High
| Name_Low
| Name_Range
| Name_Reverse_Range =>
Res := Sem_Array_Attribute_Name (Attr);
when Name_Ascending =>
if Flags.Vhdl_Std > Vhdl_87 then
Res := Sem_Array_Attribute_Name (Attr);
else
Res := Sem_User_Attribute (Attr);
end if;
when Name_Stable
| Name_Event
| Name_Last_Value
| Name_Delayed
| Name_Quiet
| Name_Transaction
| Name_Active
| Name_Last_Active
| Name_Last_Event =>
Res := Sem_Signal_Attribute (Attr);
when Name_Driving
| Name_Driving_Value =>
if Flags.Vhdl_Std > Vhdl_87 then
Res := Sem_Signal_Attribute (Attr);
else
Res := Sem_User_Attribute (Attr);
end if;
when Name_Simple_Name
| Name_Path_Name
| Name_Instance_Name =>
if Flags.Vhdl_Std > Vhdl_87 then
Res := Sem_Name_Attribute (Attr);
else
Res := Sem_User_Attribute (Attr);
end if;
when Name_Subtype =>
if Flags.Vhdl_Std >= Vhdl_08 then
Res := Sem_Subtype_Attribute (Attr);
else
Res := Sem_User_Attribute (Attr);
end if;
when Name_Across
| Name_Through =>
if Flags.AMS_Vhdl then
Res := Sem_Nature_Type_Attribute (Attr);
else
Res := Sem_User_Attribute (Attr);
end if;
when Name_Reference =>
if Flags.AMS_Vhdl then
Res := Sem_Nature_Reference_Attribute (Attr);
else
Res := Sem_User_Attribute (Attr);
end if;
when Name_Above
| Name_Dot
| Name_Integ
| Name_Zoh
| Name_Ltf
| Name_Ztf =>
if Flags.AMS_Vhdl then
Res := Sem_Quantity_Attribute (Attr);
else
Res := Sem_User_Attribute (Attr);
end if;
when Name_Ramp =>
if Flags.AMS_Vhdl then
Res := Sem_Signal_Attribute (Attr);
else
Res := Sem_User_Attribute (Attr);
end if;
when Name_Slew =>
if Flags.AMS_Vhdl then
Res := Sem_Slew_Attribute (Attr);
else
Res := Sem_User_Attribute (Attr);
end if;
when others =>
Res := Sem_User_Attribute (Attr);
end case;
if Res = Null_Iir then
Error_Kind ("sem_attribute_name", Attr);
end if;
Set_Named_Entity (Attr, Res);
end Sem_Attribute_Name;
-- LRM93 6
procedure Sem_Name (Name : Iir; Keep_Alias : Boolean := False) is
begin
-- Exit now if NAME was already analyzed.
if Get_Named_Entity (Name) /= Null_Iir then
return;
end if;
case Get_Kind (Name) is
when Iir_Kind_Simple_Name
| Iir_Kind_Character_Literal
| Iir_Kind_Operator_Symbol =>
-- String_Literal may be a operator_symbol.
Sem_Simple_Name (Name, Keep_Alias, Soft => False);
when Iir_Kind_Selected_Name =>
Sem_Selected_Name (Name, Keep_Alias);
when Iir_Kind_Parenthesis_Name =>
Sem_Parenthesis_Name (Name);
when Iir_Kind_Selected_By_All_Name =>
Sem_Selected_By_All_Name (Name);
when Iir_Kind_Attribute_Name =>
Sem_Attribute_Name (Name);
when Iir_Kinds_External_Name =>
Sem_External_Name (Name);
when others =>
Error_Kind ("sem_name", Name);
end case;
end Sem_Name;
procedure Sem_Name_Soft (Name : Iir)
is
begin
-- Exit now if NAME was already analyzed.
if Get_Named_Entity (Name) /= Null_Iir then
return;
end if;
case Get_Kind (Name) is
when Iir_Kind_Simple_Name
| Iir_Kind_Operator_Symbol =>
-- String_Literal may be a operator_symbol.
Sem_Simple_Name (Name, False, Soft => True);
when Iir_Kind_Selected_Name =>
Sem_Selected_Name (Name, Keep_Alias => False, Soft => True);
when Iir_Kind_Parenthesis_Name =>
-- FIXME: SOFT!!
Sem_Parenthesis_Name (Name);
when others =>
Error_Kind ("sem_name_soft", Name);
end case;
end Sem_Name_Soft;
procedure Sem_Name_Clean_1 (Name : Iir)
is
Named_Entity : Iir;
Atype : Iir;
begin
if Name = Null_Iir then
return;
end if;
-- Clear and free overload lists of Named_entity and type.
Named_Entity := Get_Named_Entity (Name);
Set_Named_Entity (Name, Null_Iir);
if Named_Entity /= Null_Iir
and then Is_Overload_List (Named_Entity)
then
Free_Iir (Named_Entity);
end if;
Atype := Get_Type (Name);
Set_Type (Name, Null_Iir);
if Atype /= Null_Iir
and then Is_Overload_List (Atype)
then
Free_Iir (Atype);
end if;
end Sem_Name_Clean_1;
procedure Sem_Name_Clean (Name : Iir) is
begin
case Get_Kind (Name) is
when Iir_Kind_Simple_Name
| Iir_Kind_Operator_Symbol =>
Sem_Name_Clean_1 (Name);
when Iir_Kind_Parenthesis_Name
| Iir_Kind_Selected_Name =>
Sem_Name_Clean_1 (Get_Prefix (Name));
Sem_Name_Clean_1 (Name);
when others =>
Error_Kind ("sem_name_clean", Name);
end case;
end Sem_Name_Clean;
-- Remove procedure specification from LIST.
function Remove_Procedures_From_List (Expr : Iir) return Iir
is
El : Iir;
List : Iir_List;
It : List_Iterator;
New_List : Iir_List;
begin
if not Is_Overload_List (Expr) then
return Expr;
end if;
List := Get_Overload_List (Expr);
New_List := Create_Iir_List;
It := List_Iterate (List);
while Is_Valid (It) loop
El := Get_Element (It);
case Get_Kind (El) is
when Iir_Kind_Procedure_Declaration =>
null;
when Iir_Kind_Function_Declaration =>
if Maybe_Function_Call (El) then
Append_Element (New_List, El);
end if;
when others =>
Append_Element (New_List, El);
end case;
Next (It);
end loop;
case Get_Nbr_Elements (New_List) is
when 0 =>
Free_Iir (Expr);
Destroy_Iir_List (New_List);
return Null_Iir;
when 1 =>
Free_Iir (Expr);
El := Get_First_Element (New_List);
Destroy_Iir_List (New_List);
return El;
when others =>
Set_Overload_List (Expr, New_List);
Destroy_Iir_List (List);
return Expr;
end case;
end Remove_Procedures_From_List;
-- Return the fully analyzed name of NAME.
function Name_To_Analyzed_Name (Name : Iir) return Iir is
begin
case Get_Kind (Name) is
when Iir_Kind_Attribute_Name
| Iir_Kind_Parenthesis_Name =>
return Get_Named_Entity (Name);
when others =>
return Name;
end case;
end Name_To_Analyzed_Name;
-- Return True iff the current design unit is package body textio.
function Is_Current_Design_Unit_Textio_Body return Boolean
is
Unit : constant Iir := Sem.Get_Current_Design_Unit;
Cur_Lib : constant Iir := Get_Library_Unit (Unit);
begin
if Get_Kind (Cur_Lib) /= Iir_Kind_Package_Body then
return False;
end if;
if Get_Library (Get_Design_File (Unit)) /= Libraries.Std_Library then
return False;
end if;
return Get_Identifier (Cur_Lib) = Std_Names.Name_Textio;
end Is_Current_Design_Unit_Textio_Body;
-- Convert name EXPR to an expression (ie, create function call).
-- A_TYPE is the expected type of the expression.
-- Returns an Error node in case of error.
function Name_To_Expression (Name : Iir; A_Type : Iir) return Iir
is
Ret_Type : Iir;
Res_Type : Iir;
Expr : Iir;
Expr_List : Iir_List;
Expr_It : List_Iterator;
Res : Iir;
Res1 : Iir;
El : Iir;
begin
Expr := Get_Named_Entity (Name);
if Get_Kind (Expr) = Iir_Kind_Error then
return Expr;
end if;
if Check_Is_Expression (Expr, Name) = Null_Iir then
return Create_Error_Expr (Name, A_Type);
end if;
-- Note: EXPR may contain procedure names...
Expr := Remove_Procedures_From_List (Expr);
Set_Named_Entity (Name, Expr);
if Expr = Null_Iir then
Error_Msg_Sem (+Name, "%n cannot be used as expression", +Name);
-- Note: this creates a loop.
Res := Create_Error_Expr (Name, A_Type);
Set_Named_Entity (Name, Res);
return Res;
end if;
if not Is_Overload_List (Expr) then
Res := Finish_Sem_Name (Name);
pragma Assert (Res /= Null_Iir);
if A_Type /= Null_Iir then
Res_Type := Get_Type (Res);
if Res_Type = Null_Iir then
return Create_Error_Expr (Res, A_Type);
end if;
if Are_Basetypes_Compatible (Get_Base_Type (Res_Type), A_Type)
= Not_Compatible
then
Error_Not_Match (Res, A_Type);
return Create_Error_Expr (Res, A_Type);
end if;
-- Fall through.
end if;
else
-- EXPR is an overloaded name.
Expr_List := Get_Overload_List (Expr);
if A_Type /= Null_Iir then
-- Find the name returning A_TYPE.
Res := Null_Iir;
Expr_It := List_Iterate (Expr_List);
while Is_Valid (Expr_It) loop
El := Get_Element (Expr_It);
if Are_Basetypes_Compatible (Get_Base_Type (Get_Type (El)),
A_Type)
/= Not_Compatible
then
Add_Result (Res, El);
end if;
Next (Expr_It);
end loop;
if Res = Null_Iir then
-- Specific error message for a non-visible enumeration
-- literal.
if (Get_Kind (Get_Base_Type (A_Type))
= Iir_Kind_Enumeration_Type_Definition)
and then Kind_In (Name, Iir_Kind_Simple_Name,
Iir_Kind_Character_Literal)
then
Res := Find_Name_In_Flist (Get_Enumeration_Literal_List
(Get_Base_Type (A_Type)),
Get_Identifier (Name));
if Res /= Null_Iir then
Error_Msg_Sem
(+Name, "enumeration literal %i is not visible "
& "(add a use clause)", +Name);
-- Keep the literal as result.
end if;
end if;
end if;
if Res = Null_Iir then
Error_Not_Match (Name, A_Type);
return Create_Error_Expr (Name, A_Type);
elsif Is_Overload_List (Res) then
Res1 := Extract_Call_Without_Implicit_Conversion (Res);
if Res1 /= Null_Iir then
Free_Iir (Res);
Res := Res1;
else
Report_Start_Group;
Error_Overload (Name);
Disp_Overload_List (Get_Overload_List (Res), Name);
Report_End_Group;
Free_Iir (Res);
return Create_Error_Expr (Name, A_Type);
end if;
end if;
-- Free results
Sem_Name_Free_Result (Expr, Res);
Ret_Type := Get_Type (Name);
if Ret_Type /= Null_Iir then
pragma Assert (Is_Overload_List (Ret_Type));
Free_Overload_List (Ret_Type);
end if;
-- Fall through.
else
-- Create a list of type.
Ret_Type := Create_List_Of_Types (Expr_List);
if Ret_Type = Null_Iir or else not Is_Overload_List (Ret_Type) then
Res1 := Extract_Call_Without_Implicit_Conversion (Expr);
if Res1 /= Null_Iir then
-- Found it.
Res := Res1;
-- Fall through
else
-- There is either no types or one type for
-- several meanings.
Report_Start_Group;
Error_Overload (Name);
Disp_Overload_List (Expr_List, Name);
Report_End_Group;
--Free_Iir (Ret_Type);
return Create_Error_Expr (Name, A_Type);
end if;
else
Set_Type (Name, Ret_Type);
return Name;
end if;
end if;
Set_Named_Entity (Name, Res);
Res := Finish_Sem_Name (Name);
end if;
-- NAME has only one meaning, which is RES.
case Get_Kind (Res) is
when Iir_Kind_Simple_Name
| Iir_Kind_Character_Literal
| Iir_Kind_Selected_Name =>
Expr := Get_Named_Entity (Res);
if Get_Kind (Expr) = Iir_Kind_Function_Declaration then
return Function_Declaration_To_Call (Res);
else
Set_Type (Res, Get_Type (Expr));
Set_Expr_Staticness (Res, Get_Expr_Staticness (Expr));
--Set_Name_Staticness (Name, Get_Name_Staticness (Expr));
--Set_Base_Name (Name, Get_Base_Name (Expr));
-- For time physical literal (without a literal), check for
-- resolution and mark the literal used.
-- Don't check for textio body, as it uses all units and
-- user code shouldn't be affected by it.
if Get_Type (Expr) = Time_Type_Definition
and then not Is_Current_Design_Unit_Textio_Body
then
pragma Assert (Get_Kind (Expr) = Iir_Kind_Unit_Declaration);
Set_Use_Flag (Expr, True);
-- See Sem_Physical_Literal.
if Get_Value (Get_Physical_Literal (Expr)) = 0 then
Error_Msg_Sem
(+Res, "physical unit %i is below the "
& "time resolution", +Expr);
end if;
end if;
return Res;
end if;
when Iir_Kind_Function_Call
| Iir_Kind_Selected_Element
| Iir_Kind_Indexed_Name
| Iir_Kind_Slice_Name
| Iir_Kind_Type_Conversion
| Iir_Kind_Attribute_Name =>
return Eval_Expr_If_Static (Res);
when Iir_Kind_Dereference =>
-- Never static.
return Res;
when Iir_Kinds_Array_Attribute =>
-- FIXME: exclude range and reverse_range.
return Eval_Expr_If_Static (Res);
when Iir_Kinds_Signal_Attribute
| Iir_Kinds_Signal_Value_Attribute
| Iir_Kind_Above_Attribute
| Iir_Kind_Dot_Attribute
| Iir_Kind_Integ_Attribute
| Iir_Kind_Ramp_Attribute
| Iir_Kind_Zoh_Attribute
| Iir_Kind_Ltf_Attribute
| Iir_Kind_Ztf_Attribute
| Iir_Kind_Signal_Slew_Attribute
| Iir_Kind_Quantity_Slew_Attribute
| Iir_Kind_Quantity_Delayed_Attribute =>
-- Never static
return Res;
when Iir_Kinds_Type_Attribute
| Iir_Kinds_Scalar_Type_Attribute
| Iir_Kind_Image_Attribute
| Iir_Kind_Value_Attribute
| Iir_Kind_Simple_Name_Attribute
| Iir_Kind_Path_Name_Attribute
| Iir_Kind_Instance_Name_Attribute =>
return Eval_Expr_If_Static (Res);
when Iir_Kind_Parenthesis_Name
| Iir_Kind_Selected_By_All_Name =>
raise Internal_Error;
when others =>
Error_Kind ("name_to_expression", Res);
end case;
end Name_To_Expression;
function Name_To_Range (Name : Iir) return Iir
is
Expr : Iir;
begin
Expr := Get_Named_Entity (Name);
if Get_Kind (Expr) = Iir_Kind_Error then
return Error_Mark;
end if;
case Get_Kind (Expr) is
when Iir_Kind_Subtype_Declaration
| Iir_Kind_Type_Declaration =>
Expr := Sem_Type_Mark (Name);
Set_Expr_Staticness
(Expr, Get_Type_Staticness (Get_Type (Expr)));
return Expr;
when Iir_Kind_Range_Array_Attribute
| Iir_Kind_Reverse_Range_Array_Attribute =>
if Get_Parameter (Expr) = Null_Iir then
Finish_Sem_Array_Attribute (Name, Expr, Null_Iir);
end if;
if Get_Kind (Name) = Iir_Kind_Attribute_Name then
Free_Iir (Name);
else
Free_Iir (Get_Prefix (Name));
Free_Parenthesis_Name (Name, Expr);
end if;
return Expr;
when others =>
Error_Msg_Sem (+Name, "%n doesn't denote a range", +Name);
return Error_Mark;
end case;
end Name_To_Range;
function Name_To_Type_Definition (Name : Iir) return Iir
is
Atype : Iir;
begin
case Get_Kind (Name) is
when Iir_Kinds_Denoting_Name =>
-- Common correct case.
Atype := Get_Named_Entity (Name);
case Get_Kind (Atype) is
when Iir_Kind_Type_Declaration =>
return Get_Type_Definition (Atype);
when Iir_Kind_Subtype_Declaration
| Iir_Kind_Interface_Type_Declaration =>
return Get_Type (Atype);
when Iir_Kind_Error =>
return Atype;
when others =>
Report_Start_Group;
Error_Msg_Sem
(+Name, "a type mark must denote a type or a subtype");
Error_Msg_Sem
(+Name, "(type mark denotes %n)", +Atype);
Report_End_Group;
return Create_Error_Type (Atype);
end case;
when Iir_Kind_Subtype_Attribute
| Iir_Kind_Element_Attribute
| Iir_Kind_Base_Attribute
| Iir_Kind_Across_Attribute
| Iir_Kind_Through_Attribute =>
return Get_Type (Name);
when Iir_Kinds_Expression_Attribute =>
Error_Msg_Sem (+Name, "%n is not a valid type mark", +Name);
return Create_Error_Type (Name);
when others =>
if not Is_Error (Name) then
Error_Msg_Sem
(+Name, "a type mark must be a simple or expanded name");
end if;
return Create_Error_Type (Name);
end case;
end Name_To_Type_Definition;
function Sem_Denoting_Name (Name: Iir) return Iir
is
Res: Iir;
begin
pragma Assert (Get_Kind (Name) in Iir_Kinds_Denoting_Name);
Sem_Name (Name);
Res := Get_Named_Entity (Name);
case Get_Kind (Res) is
when Iir_Kind_Error =>
-- A message must have been displayed.
return Name;
when Iir_Kind_Overload_List =>
Error_Overload (Name);
Set_Named_Entity (Name, Create_Error_Name (Name));
return Name;
when Iir_Kinds_Concurrent_Statement
| Iir_Kinds_Sequential_Statement
| Iir_Kind_Type_Declaration
| Iir_Kind_Subtype_Declaration
| Iir_Kind_Nature_Declaration
| Iir_Kind_Subnature_Declaration
| Iir_Kind_Enumeration_Literal
| Iir_Kind_Unit_Declaration
| Iir_Kind_Group_Template_Declaration
| Iir_Kind_Group_Declaration
| Iir_Kind_Attribute_Declaration
| Iir_Kinds_Object_Declaration
| Iir_Kind_Terminal_Declaration
| Iir_Kind_Entity_Declaration
| Iir_Kind_Configuration_Declaration
| Iir_Kind_Package_Declaration
| Iir_Kind_Context_Declaration
| Iir_Kind_Package_Instantiation_Declaration
| Iir_Kind_Interface_Package_Declaration
| Iir_Kind_Library_Declaration
| Iir_Kinds_Subprogram_Declaration
| Iir_Kind_Component_Declaration =>
Res := Finish_Sem_Name (Name, Res);
pragma Assert (Get_Kind (Res) in Iir_Kinds_Denoting_Name);
return Res;
when Iir_Kind_Selected_Element =>
-- An error (to be diagnosticed by the caller).
return Name;
when others =>
Error_Kind ("sem_denoting_name", Res);
end case;
end Sem_Denoting_Name;
procedure Sem_External_Name (Name : Iir)
is
Atype : Iir;
begin
pragma Assert (Get_Type (Name) = Null_Iir);
Atype := Get_Subtype_Indication (Name);
Atype := Sem_Types.Sem_Subtype_Indication (Atype);
Set_Subtype_Indication (Name, Atype);
Atype := Get_Type_Of_Subtype_Indication (Atype);
if Atype = Null_Iir then
Atype := Create_Error_Type (Null_Iir);
end if;
Set_Type (Name, Atype);
-- LRM08 8.1 Names
-- A name is said to be a static name if and only if one of the
-- following condition holds:
-- - The name is an external name.
Set_Name_Staticness (Name, Globally);
Set_Expr_Staticness (Name, None);
-- Consider the node as analyzed.
Set_Named_Entity (Name, Name);
end Sem_External_Name;
function Sem_Terminal_Name (Name : Iir) return Iir
is
Res : Iir;
begin
Sem_Name (Name);
Res := Get_Named_Entity (Name);
case Get_Kind (Res) is
when Iir_Kind_Error =>
-- A message must have been displayed.
return Name;
when Iir_Kind_Overload_List =>
Error_Overload (Res);
Set_Named_Entity (Name, Create_Error_Name (Name));
return Name;
when Iir_Kind_Terminal_Declaration
| Iir_Kind_Interface_Terminal_Declaration
| Iir_Kind_Nature_Reference_Attribute =>
Res := Finish_Sem_Name (Name, Res);
return Res;
when others =>
Error_Class_Match (Name, "terminal");
Set_Named_Entity (Name, Create_Error_Name (Name));
return Name;
end case;
end Sem_Terminal_Name;
procedure Error_Class_Match (Name : Iir; Class_Name : String)
is
Ent : constant Iir := Get_Named_Entity (Name);
begin
if Is_Error (Ent) then
Error_Msg_Sem (+Name, Class_Name & " name expected");
else
Error_Msg_Sem (+Name, Class_Name & " name expected, found %n",
+Get_Named_Entity (Name));
end if;
end Error_Class_Match;
end Vhdl.Sem_Names;
|