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-- Interpreted simulation
-- Copyright (C) 2014 Tristan Gingold
--
-- GHDL is free software; you can redistribute it and/or modify it under
-- the terms of the GNU General Public License as published by the Free
-- Software Foundation; either version 2, or (at your option) any later
-- version.
--
-- GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
-- WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with GHDL; see the file COPYING. If not, write to the Free
-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-- 02111-1307, USA.
with Types; use Types;
with Iirs; use Iirs;
with Iir_Values; use Iir_Values;
with Elaboration; use Elaboration;
with Areapools; use Areapools;
package Execution is
Trace_Statements : Boolean := False;
-- If true, disp current time in assert message.
Disp_Time_Before_Values: Boolean := False;
Current_Component : Block_Instance_Acc := null;
-- State associed with each process.
type Process_State_Type is record
-- The process instance.
Top_Instance: Block_Instance_Acc := null;
Proc: Iir := Null_Iir;
-- Memory pool to allocate objects from.
Pool : aliased Areapool;
-- The stack of the process.
Instance : Block_Instance_Acc := null;
end record;
type Process_State_Acc is access all Process_State_Type;
Simulation_Finished : exception;
-- Current process being executed. This is only for the debugger.
Current_Process : Process_State_Acc;
-- Pseudo process used for resolution functions, ...
No_Process : Process_State_Acc := new Process_State_Type;
-- Execute a list of sequential statements.
-- Return when there is no more statements to execute.
procedure Execute_Sequential_Statements (Proc : Process_State_Acc);
-- Evaluate an expression.
function Execute_Expression (Block: Block_Instance_Acc; Expr: Iir)
return Iir_Value_Literal_Acc;
-- Evaluate boolean condition COND. If COND is Null_Iir, returns true.
function Execute_Condition (Instance : Block_Instance_Acc;
Cond : Iir) return Boolean;
-- Execute a name. Return the value if Ref is False, or the reference
-- (for a signal, a quantity or a terminal) if Ref is True.
function Execute_Name (Block: Block_Instance_Acc;
Expr: Iir;
Ref : Boolean := False)
return Iir_Value_Literal_Acc;
procedure Execute_Name_With_Base (Block: Block_Instance_Acc;
Expr: Iir;
Base : Iir_Value_Literal_Acc;
Res : out Iir_Value_Literal_Acc;
Is_Sig : out Boolean);
-- Return the initial value (default value) of signal name EXPR. To be
-- used only during (non-dynamic) elaboration.
function Execute_Signal_Init_Value (Block : Block_Instance_Acc; Expr : Iir)
return Iir_Value_Literal_Acc;
function Execute_Expression_With_Type
(Block: Block_Instance_Acc;
Expr: Iir;
Expr_Type : Iir)
return Iir_Value_Literal_Acc;
function Execute_Resolution_Function
(Block: Block_Instance_Acc; Imp : Iir; Arr : Iir_Value_Literal_Acc)
return Iir_Value_Literal_Acc;
function Execute_Assoc_Conversion
(Block : Block_Instance_Acc; Conv : Iir; Val : Iir_Value_Literal_Acc)
return Iir_Value_Literal_Acc;
-- Sub function common for left/right/length/low/high attributes.
-- Return bounds of PREFIX.
function Execute_Bounds (Block: Block_Instance_Acc; Prefix: Iir)
return Iir_Value_Literal_Acc;
-- Compute the offset for INDEX into a range BOUNDS.
-- EXPR is only used in case of error.
function Get_Index_Offset
(Index: Iir_Value_Literal_Acc;
Bounds: Iir_Value_Literal_Acc;
Expr: Iir)
return Iir_Index32;
function Execute_Low_Limit (Bounds : Iir_Value_Literal_Acc)
return Iir_Value_Literal_Acc;
function Get_Instance_For_Slot (Instance: Block_Instance_Acc; Decl: Iir)
return Block_Instance_Acc;
-- Store VALUE to TARGET.
-- Note: VALUE is not freed.
procedure Assign_Value_To_Object
(Instance: Block_Instance_Acc;
Target: Iir_Value_Literal_Acc;
Target_Type: Iir;
Value: Iir_Value_Literal_Acc;
Stmt: Iir);
-- Check VALUE follows the constraints of DEF.
-- INSTANCE,DEF is the definition of a subtype.
-- EXPR is just used in case of error to display the location
-- If there is no location, EXPR can be null.
-- Implicitly convert VALUE (array cases).
-- Return in case of success.
-- Raise errorout.execution_constraint_error in case of failure.
procedure Check_Constraints
(Instance: Block_Instance_Acc;
Value: Iir_Value_Literal_Acc;
Def: Iir; Expr: Iir);
-- If VALUE is not an array, then this is a no-op.
-- If VALUE is an array, then bounds are checked and converted. INSTANCE
-- is the instance corresponding to REF_TYPE.
-- EXPR is used in case of error.
procedure Implicit_Array_Conversion (Value : in out Iir_Value_Literal_Acc;
Ref_Value : Iir_Value_Literal_Acc;
Expr : Iir);
procedure Implicit_Array_Conversion (Instance : Block_Instance_Acc;
Value : in out Iir_Value_Literal_Acc;
Ref_Type : Iir;
Expr : Iir);
-- Create an iir_value_literal of kind iir_value_array and of life LIFE.
-- Allocate the array of bounds, and fill it from A_TYPE.
-- Allocate the array of values.
function Create_Array_Bounds_From_Type
(Block : Block_Instance_Acc;
A_Type : Iir;
Create_Val_Array : Boolean)
return Iir_Value_Literal_Acc;
-- Create a range from LEN for scalar type ATYPE.
function Create_Bounds_From_Length (Block : Block_Instance_Acc;
Atype : Iir;
Len : Iir_Index32)
return Iir_Value_Literal_Acc;
-- Return TRUE iff VAL is in the range defined by BOUNDS.
function Is_In_Range (Val : Iir_Value_Literal_Acc;
Bounds : Iir_Value_Literal_Acc)
return Boolean;
-- Increment or decrement VAL according to BOUNDS.DIR.
procedure Update_Loop_Index (Val : Iir_Value_Literal_Acc;
Bounds : Iir_Value_Literal_Acc);
-- Create a block instance for subprogram IMP.
function Create_Subprogram_Instance (Instance : Block_Instance_Acc;
Imp : Iir)
return Block_Instance_Acc;
function Execute_Function_Body (Instance : Block_Instance_Acc; Func : Iir)
return Iir_Value_Literal_Acc;
function Execute_Image_Attribute (Val : Iir_Value_Literal_Acc;
Expr_Type : Iir)
return String;
end Execution;
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