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trans-chap8.adb
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trans-chap8.adb
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-- Iir to ortho translator.
-- Copyright (C) 2002 - 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 GCC; see the file COPYING. If not, write to the Free
-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-- 02111-1307, USA.
with Ada.Text_IO;
with Std_Names;
with Errorout; use Errorout;
with Iir_Chains;
with Canon;
with Evaluation; use Evaluation;
with Std_Package; use Std_Package;
with Iirs_Utils; use Iirs_Utils;
with Trans.Chap2;
with Trans.Chap3;
with Trans.Chap4;
with Trans.Chap6;
with Trans.Chap7;
with Trans.Chap9;
with Trans.Chap14;
with Trans_Decls; use Trans_Decls;
with Translation; use Translation;
with Trans.Helpers2; use Trans.Helpers2;
with Trans.Foreach_Non_Composite;
package body Trans.Chap8 is
use Trans.Helpers;
-- The LOCAL_STATE is a local variable read from the frame at entry and
-- written before return. The value INITIAL_STATE (0) is the initial
-- state. For processes, this is the state for the first statement. For
-- subprograms, this is the state at call, before dynamic elaboration of
-- local declarations.
-- Subprograms have more special values:
-- 1: The return state. Finalization is performed.
Local_State : O_Dnode := O_Dnode_Null;
Initial_State : constant State_Type := 0;
-- Return_State : constant State_Value_Type := 1;
-- Next value available.
State_Next : State_Type := Initial_State;
-- Info node to which the state variable is attached. Used to set and save
-- the state variable.
State_Info : Ortho_Info_Acc := null;
-- Statements construct for the state machine. The generated code is:
-- local var STATE: index_type;
-- begin
-- STATE := FRAME.all.STATE;
-- loop
-- case STATE is
-- when 0 => ...
-- when 1 => ...
-- ...
-- end case;
-- end loop;
-- end;
State_Case : Ortho_Nodes.O_Case_Block;
State_Loop : Ortho_Nodes.O_Snode;
function Get_State_Var (Info : Ortho_Info_Acc) return O_Lnode is
begin
case Info.Kind is
when Kind_Process =>
return Get_Var (Info.Process_State);
when Kind_Subprg =>
return New_Selected_Acc_Value
(New_Obj (Info.Res_Interface), Info.Subprg_State_Field);
when others =>
raise Internal_Error;
end case;
end Get_State_Var;
procedure State_Entry (Info : Ortho_Info_Acc) is
begin
-- Not reentrant.
pragma Assert (not State_Enabled);
State_Info := Info;
-- For optimization, create a copy of the STATE variable.
New_Var_Decl (Local_State, Get_Identifier ("STATE"),
O_Storage_Local, Ghdl_Index_Type);
-- Initialize it from the frame.
New_Assign_Stmt (New_Obj (Local_State),
New_Value (Get_State_Var (Info)));
Start_Loop_Stmt (State_Loop);
Start_Case_Stmt (State_Case, New_Obj_Value (Local_State));
State_Start (0);
State_Next := 0;
end State_Entry;
procedure State_Leave (Parent : Iir) is
begin
pragma Assert (State_Enabled);
pragma Assert (Get_Info (Parent) = State_Info);
if State_Debug then
Start_Choice (State_Case);
New_Default_Choice (State_Case);
Finish_Choice (State_Case);
Chap6.Gen_Program_Error (Parent, Chap6.Prg_Err_Unreach_State);
end if;
Finish_Case_Stmt (State_Case);
Finish_Loop_Stmt (State_Loop);
Local_State := O_Dnode_Null;
State_Info := null;
end State_Leave;
function State_Enabled return Boolean is
begin
return Local_State /= O_Dnode_Null;
end State_Enabled;
function State_Allocate return State_Type is
begin
State_Next := State_Next + 1;
return State_Next;
end State_Allocate;
function State_To_Lit (State : State_Type) return O_Cnode is
begin
return New_Index_Lit (Unsigned_64 (State));
end State_To_Lit;
procedure State_Start (State : State_Type) is
begin
Start_Choice (State_Case);
New_Expr_Choice (State_Case, State_To_Lit (State));
Finish_Choice (State_Case);
end State_Start;
procedure State_Jump (Next_State : State_Type) is
begin
New_Assign_Stmt (New_Obj (Local_State),
New_Lit (State_To_Lit (Next_State)));
end State_Jump;
procedure State_Jump_Force is
begin
New_Next_Stmt (State_Loop);
end State_Jump_Force;
procedure State_Suspend (Next_State : State_Type) is
begin
New_Assign_Stmt (Get_State_Var (State_Info),
New_Lit (State_To_Lit (Next_State)));
New_Return_Stmt;
end State_Suspend;
procedure Translate_Return_Statement (Stmt : Iir_Return_Statement)
is
Subprg_Info : constant Ortho_Info_Acc :=
Get_Info (Chap2.Current_Subprogram);
Expr : constant Iir := Get_Expression (Stmt);
Ret_Type : Iir;
Ret_Info : Type_Info_Acc;
procedure Gen_Return is
begin
if Subprg_Info.Subprg_Exit /= O_Snode_Null then
New_Exit_Stmt (Subprg_Info.Subprg_Exit);
else
New_Return_Stmt;
end if;
end Gen_Return;
procedure Gen_Return_Value (Val : O_Enode) is
begin
if Subprg_Info.Subprg_Exit /= O_Snode_Null then
New_Assign_Stmt (New_Obj (Subprg_Info.Subprg_Result), Val);
New_Exit_Stmt (Subprg_Info.Subprg_Exit);
else
New_Return_Stmt (Val);
end if;
end Gen_Return_Value;
begin
if Expr = Null_Iir then
-- Return in a procedure.
if Get_Suspend_Flag (Chap2.Current_Subprogram) then
State_Jump (State_Return);
State_Jump_Force;
else
Gen_Return;
end if;
return;
end if;
-- Return in a function.
Ret_Type := Get_Return_Type (Chap2.Current_Subprogram);
Ret_Info := Get_Info (Ret_Type);
case Ret_Info.Type_Mode is
when Type_Mode_Scalar =>
-- * if the return type is scalar, simply returns.
declare
V : O_Dnode;
R : O_Enode;
begin
-- Always uses a temporary in case of the return expression
-- uses secondary stack. This can happen in constructs like:
-- return my_func (param)(index);
-- FIXME: don't use the temp if not required.
R := Chap7.Translate_Expression (Expr, Ret_Type);
if Has_Stack2_Mark
or else Chap3.Need_Range_Check (Expr, Ret_Type)
then
V := Create_Temp (Ret_Info.Ortho_Type (Mode_Value));
New_Assign_Stmt (New_Obj (V), R);
Stack2_Release;
Chap3.Check_Range (V, Expr, Ret_Type, Expr);
Gen_Return_Value (New_Obj_Value (V));
else
Gen_Return_Value (R);
end if;
end;
when Type_Mode_Acc
| Type_Mode_Bounds_Acc =>
-- * access: no range.
declare
Res : O_Enode;
begin
Res := Chap7.Translate_Expression (Expr, Ret_Type);
Gen_Return_Value (Res);
end;
when Type_Mode_Unbounded_Array
| Type_Mode_Unbounded_Record =>
-- * if the return type is unconstrained: allocate an area from
-- the secondary stack, copy it to the area, and fill the fat
-- pointer.
-- Evaluate the result.
declare
Val : Mnode;
Area : Mnode;
begin
Area := Dp2M (Subprg_Info.Res_Interface,
Ret_Info, Mode_Value);
Val := Stabilize
(E2M (Chap7.Translate_Expression (Expr, Ret_Type),
Ret_Info, Mode_Value));
Chap3.Translate_Object_Allocation
(Area, Alloc_Return, Ret_Type,
Chap3.Get_Array_Bounds (Val));
Chap3.Translate_Object_Copy (Area, M2Addr (Val), Ret_Type);
Gen_Return;
end;
when Type_Mode_Record
| Type_Mode_Array =>
-- * if the return type is a constrained composite type, copy
-- it to the result area.
-- Create a temporary area so that if the expression use
-- stack2, it will be freed before the return (otherwise,
-- the stack area will be lost).
declare
V : Mnode;
begin
Open_Temp;
V := Dp2M (Subprg_Info.Res_Interface, Ret_Info, Mode_Value);
Chap3.Translate_Object_Copy
(V, Chap7.Translate_Expression (Expr, Ret_Type), Ret_Type);
Close_Temp;
Gen_Return;
end;
when Type_Mode_File
| Type_Mode_Unknown
| Type_Mode_Protected =>
raise Internal_Error;
end case;
end Translate_Return_Statement;
procedure Translate_If_Statement_State_Jumps
(Stmt : Iir; Fall_State : State_Type)
is
Blk : O_If_Block;
Else_Clause : Iir;
begin
Start_If_Stmt
(Blk, Chap7.Translate_Expression (Get_Condition (Stmt)));
State_Jump (State_Allocate);
New_Else_Stmt (Blk);
Else_Clause := Get_Else_Clause (Stmt);
if Else_Clause = Null_Iir then
State_Jump (Fall_State);
else
if Get_Condition (Else_Clause) = Null_Iir then
State_Jump (State_Allocate);
else
Open_Temp;
New_Debug_Line_Stmt (Get_Line_Number (Else_Clause));
Translate_If_Statement_State_Jumps (Else_Clause, Fall_State);
Close_Temp;
end if;
end if;
Finish_If_Stmt (Blk);
end Translate_If_Statement_State_Jumps;
procedure Translate_If_Statement_State (Stmt : Iir)
is
Fall_State : State_Type;
Next_State : State_Type;
Branch : Iir;
begin
Fall_State := State_Allocate;
Next_State := Fall_State;
-- Generate the jumps.
Open_Temp;
Translate_If_Statement_State_Jumps (Stmt, Fall_State);
Close_Temp;
-- Generate statements.
Branch := Stmt;
loop
Next_State := Next_State + 1;
State_Start (Next_State);
Translate_Statements_Chain (Get_Sequential_Statement_Chain (Branch));
State_Jump (Fall_State);
Branch := Get_Else_Clause (Branch);
exit when Branch = Null_Iir;
end loop;
State_Start (Fall_State);
end Translate_If_Statement_State;
procedure Translate_If_Statement_Direct (Stmt : Iir)
is
Blk : O_If_Block;
Else_Clause : Iir;
begin
Start_If_Stmt
(Blk, Chap7.Translate_Expression (Strip_Reference_Name
(Get_Condition (Stmt))));
Translate_Statements_Chain (Get_Sequential_Statement_Chain (Stmt));
Else_Clause := Get_Else_Clause (Stmt);
if Else_Clause /= Null_Iir then
New_Else_Stmt (Blk);
if Get_Condition (Else_Clause) = Null_Iir then
Translate_Statements_Chain
(Get_Sequential_Statement_Chain (Else_Clause));
else
Open_Temp;
New_Debug_Line_Stmt (Get_Line_Number (Else_Clause));
Translate_If_Statement_Direct (Else_Clause);
Close_Temp;
end if;
end if;
Finish_If_Stmt (Blk);
end Translate_If_Statement_Direct;
procedure Translate_If_Statement (Stmt : Iir) is
begin
if Get_Suspend_Flag (Stmt) then
Translate_If_Statement_State (Stmt);
else
Translate_If_Statement_Direct (Stmt);
end if;
end Translate_If_Statement;
function Get_Range_Ptr_Field_Value (O_Range : O_Lnode; Field : O_Fnode)
return O_Enode
is
begin
return New_Value (New_Selected_Element
(New_Access_Element (New_Value (O_Range)), Field));
end Get_Range_Ptr_Field_Value;
-- Inc or dec ITERATOR according to DIR.
procedure Gen_Update_Iterator_Common (Val : Unsigned_64;
Itype : Iir;
V : out O_Enode)
is
Base_Type : constant Iir := Get_Base_Type (Itype);
begin
case Get_Kind (Base_Type) is
when Iir_Kind_Integer_Type_Definition =>
V := New_Lit
(New_Signed_Literal
(Get_Ortho_Type (Base_Type, Mode_Value), Integer_64 (Val)));
when Iir_Kind_Enumeration_Type_Definition =>
declare
List : Iir_List;
begin
List := Get_Enumeration_Literal_List (Base_Type);
-- FIXME: what about type E is ('T') ??
if Natural (Val) > Get_Nbr_Elements (List) then
raise Internal_Error;
end if;
V := New_Lit
(Get_Ortho_Expr (Get_Nth_Element (List, Natural (Val))));
end;
when others =>
Error_Kind ("gen_update_iterator", Base_Type);
end case;
end Gen_Update_Iterator_Common;
procedure Gen_Update_Iterator (Iterator : O_Dnode;
Dir : Iir_Direction;
Val : Unsigned_64;
Itype : Iir)
is
Op : ON_Op_Kind;
V : O_Enode;
begin
case Dir is
when Iir_To =>
Op := ON_Add_Ov;
when Iir_Downto =>
Op := ON_Sub_Ov;
end case;
Gen_Update_Iterator_Common (Val, Itype, V);
New_Assign_Stmt (New_Obj (Iterator),
New_Dyadic_Op (Op, New_Obj_Value (Iterator), V));
end Gen_Update_Iterator;
procedure Gen_Update_Iterator (Iterator : Var_Type;
Dir : Iir_Direction;
Val : Unsigned_64;
Itype : Iir)
is
Op : ON_Op_Kind;
V : O_Enode;
begin
case Dir is
when Iir_To =>
Op := ON_Add_Ov;
when Iir_Downto =>
Op := ON_Sub_Ov;
end case;
Gen_Update_Iterator_Common (Val, Itype, V);
New_Assign_Stmt (Get_Var (Iterator),
New_Dyadic_Op (Op, New_Value (Get_Var (Iterator)), V));
end Gen_Update_Iterator;
procedure Translate_For_Loop_Statement_Declaration (Stmt : Iir)
is
Iterator : constant Iir := Get_Parameter_Specification (Stmt);
Iter_Type : constant Iir := Get_Type (Iterator);
Iter_Type_Info : constant Type_Info_Acc :=
Get_Info (Get_Base_Type (Iter_Type));
Constraint : constant Iir := Get_Range_Constraint (Iter_Type);
It_Info : Ortho_Info_Acc;
begin
-- Iterator range.
Chap3.Translate_Object_Subtype (Iterator, False);
-- Iterator variable.
It_Info := Add_Info (Iterator, Kind_Iterator);
It_Info.Iterator_Var := Create_Var
(Create_Var_Identifier (Iterator),
Iter_Type_Info.Ortho_Type (Mode_Value),
O_Storage_Local);
if Get_Kind (Constraint) = Iir_Kind_Range_Expression then
It_Info.Iterator_Right := Create_Var
(Create_Var_Identifier ("IT_RIGHT"),
Iter_Type_Info.Ortho_Type (Mode_Value),
O_Storage_Local);
else
It_Info.Iterator_Range := Create_Var
(Create_Var_Identifier ("IT_RANGE"),
Iter_Type_Info.B.Range_Ptr_Type,
O_Storage_Local);
end if;
end Translate_For_Loop_Statement_Declaration;
procedure Start_For_Loop (Iterator : Iir_Iterator_Declaration;
Cond : out O_Enode)
is
Iter_Type : constant Iir := Get_Type (Iterator);
Iter_Base_Type : constant Iir := Get_Base_Type (Iter_Type);
Iter_Type_Info : constant Ortho_Info_Acc := Get_Info (Iter_Base_Type);
It_Info : constant Ortho_Info_Acc := Get_Info (Iterator);
Constraint : constant Iir := Get_Range_Constraint (Iter_Type);
Dir : Iir_Direction;
Op : ON_Op_Kind;
begin
if Get_Kind (Constraint) = Iir_Kind_Range_Expression then
New_Assign_Stmt
(Get_Var (It_Info.Iterator_Var),
Chap7.Translate_Range_Expression_Left (Constraint,
Iter_Base_Type));
Dir := Get_Direction (Constraint);
New_Assign_Stmt
(Get_Var (It_Info.Iterator_Right),
Chap7.Translate_Range_Expression_Right (Constraint,
Iter_Base_Type));
case Dir is
when Iir_To =>
Op := ON_Le;
when Iir_Downto =>
Op := ON_Ge;
end case;
-- Check for at least one iteration.
Cond := New_Compare_Op
(Op, New_Value (Get_Var (It_Info.Iterator_Var)),
New_Value (Get_Var (It_Info.Iterator_Right)),
Ghdl_Bool_Type);
else
New_Assign_Stmt (Get_Var (It_Info.Iterator_Range),
New_Address (Chap7.Translate_Range
(Constraint, Iter_Base_Type),
Iter_Type_Info.B.Range_Ptr_Type));
New_Assign_Stmt
(Get_Var (It_Info.Iterator_Var),
Get_Range_Ptr_Field_Value (Get_Var (It_Info.Iterator_Range),
Iter_Type_Info.B.Range_Left));
-- Before starting the loop, check whether there will be at least
-- one iteration.
Cond := New_Compare_Op
(ON_Gt,
Get_Range_Ptr_Field_Value (Get_Var (It_Info.Iterator_Range),
Iter_Type_Info.B.Range_Length),
New_Lit (Ghdl_Index_0),
Ghdl_Bool_Type);
end if;
end Start_For_Loop;
procedure Exit_Cond_For_Loop (Iterator : Iir; Cond : out O_Enode)
is
Iter_Type : constant Iir := Get_Type (Iterator);
Iter_Base_Type : constant Iir := Get_Base_Type (Iter_Type);
Iter_Type_Info : constant Ortho_Info_Acc := Get_Info (Iter_Base_Type);
It_Info : constant Ortho_Info_Acc := Get_Info (Iterator);
Constraint : constant Iir := Get_Range_Constraint (Iter_Type);
Val : O_Enode;
begin
-- Check end of loop.
-- Equality is necessary and enough.
if Get_Kind (Constraint) = Iir_Kind_Range_Expression then
Val := New_Value (Get_Var (It_Info.Iterator_Right));
else
Val := Get_Range_Ptr_Field_Value
(Get_Var (It_Info.Iterator_Range), Iter_Type_Info.B.Range_Right);
end if;
Cond := New_Compare_Op (ON_Eq,
New_Value (Get_Var (It_Info.Iterator_Var)), Val,
Ghdl_Bool_Type);
end Exit_Cond_For_Loop;
procedure Update_For_Loop (Iterator : Iir)
is
Iter_Type : constant Iir := Get_Type (Iterator);
Iter_Base_Type : constant Iir := Get_Base_Type (Iter_Type);
Iter_Type_Info : constant Ortho_Info_Acc := Get_Info (Iter_Base_Type);
It_Info : constant Ortho_Info_Acc := Get_Info (Iterator);
If_Blk1 : O_If_Block;
Deep_Rng : Iir;
Deep_Reverse : Boolean;
begin
-- Update the iterator.
Chap6.Get_Deep_Range_Expression (Iter_Type, Deep_Rng, Deep_Reverse);
if Deep_Rng /= Null_Iir then
if Get_Direction (Deep_Rng) = Iir_To xor Deep_Reverse then
Gen_Update_Iterator (It_Info.Iterator_Var,
Iir_To, 1, Iter_Base_Type);
else
Gen_Update_Iterator (It_Info.Iterator_Var,
Iir_Downto, 1, Iter_Base_Type);
end if;
else
Start_If_Stmt
(If_Blk1, New_Compare_Op
(ON_Eq,
Get_Range_Ptr_Field_Value (Get_Var (It_Info.Iterator_Range),
Iter_Type_Info.B.Range_Dir),
New_Lit (Ghdl_Dir_To_Node),
Ghdl_Bool_Type));
Gen_Update_Iterator (It_Info.Iterator_Var,
Iir_To, 1, Iter_Base_Type);
New_Else_Stmt (If_Blk1);
Gen_Update_Iterator (It_Info.Iterator_Var,
Iir_Downto, 1, Iter_Base_Type);
Finish_If_Stmt (If_Blk1);
end if;
end Update_For_Loop;
Current_Loop : Iir := Null_Iir;
procedure Translate_For_Loop_Statement_State
(Stmt : Iir_For_Loop_Statement)
is
Iterator : constant Iir := Get_Parameter_Specification (Stmt);
It_Info : constant Ortho_Info_Acc := Get_Info (Iterator);
Info : constant Loop_State_Info_Acc := Get_Info (Stmt);
Loop_If : O_If_Block;
Cond : O_Enode;
begin
pragma Assert (It_Info /= null);
Info.Loop_State_Next := State_Allocate;
Info.Loop_State_Exit := State_Allocate;
Info.Loop_State_Body := State_Allocate;
-- Loop header: initialize iterator, skip the whole body in case of
-- null range.
Open_Temp;
Start_For_Loop (Iterator, Cond);
Start_If_Stmt (Loop_If, Cond);
State_Jump (Info.Loop_State_Body);
New_Else_Stmt (Loop_If);
State_Jump (Info.Loop_State_Exit);
Finish_If_Stmt (Loop_If);
Close_Temp;
-- Loop body.
State_Start (Info.Loop_State_Body);
Translate_Statements_Chain (Get_Sequential_Statement_Chain (Stmt));
State_Jump (Info.Loop_State_Next);
-- Loop next.
State_Start (Info.Loop_State_Next);
Exit_Cond_For_Loop (Iterator, Cond);
Start_If_Stmt (Loop_If, Cond);
State_Jump (Info.Loop_State_Exit);
New_Else_Stmt (Loop_If);
Update_For_Loop (Iterator);
State_Jump (Info.Loop_State_Body);
Finish_If_Stmt (Loop_If);
-- Exit state, after loop.
State_Start (Info.Loop_State_Exit);
Free_Info (Iterator);
end Translate_For_Loop_Statement_State;
procedure Translate_For_Loop_Statement_Direct
(Stmt : Iir_For_Loop_Statement)
is
Iterator : constant Iir := Get_Parameter_Specification (Stmt);
Loop_Info : Loop_Info_Acc;
-- If around the loop, to check if the loop must be executed.
Loop_If : O_If_Block;
Cond : O_Enode;
begin
Start_Declare_Stmt;
Open_Temp;
Translate_For_Loop_Statement_Declaration (Stmt);
-- Loop header: initialize iterator.
Start_For_Loop (Iterator, Cond);
-- Skip the whole loop in case of null range.
Start_If_Stmt (Loop_If, Cond);
-- Start loop.
-- There are two blocks: one for the exit, one for the next.
Loop_Info := Add_Info (Stmt, Kind_Loop);
Start_Loop_Stmt (Loop_Info.Label_Exit);
Start_Loop_Stmt (Loop_Info.Label_Next);
-- Loop body.
Translate_Statements_Chain (Get_Sequential_Statement_Chain (Stmt));
-- Fake 'next' statement.
New_Exit_Stmt (Loop_Info.Label_Next);
Finish_Loop_Stmt (Loop_Info.Label_Next);
-- Exit loop if right bound reached.
Exit_Cond_For_Loop (Iterator, Cond);
Gen_Exit_When (Loop_Info.Label_Exit, Cond);
Update_For_Loop (Iterator);
Finish_Loop_Stmt (Loop_Info.Label_Exit);
Finish_If_Stmt (Loop_If);
Close_Temp;
Free_Info (Stmt);
Finish_Declare_Stmt;
Free_Info (Iterator);
end Translate_For_Loop_Statement_Direct;
procedure Translate_For_Loop_Statement (Stmt : Iir_For_Loop_Statement)
is
Prev_Loop : Iir;
begin
Prev_Loop := Current_Loop;
Current_Loop := Stmt;
if Get_Suspend_Flag (Stmt) then
Translate_For_Loop_Statement_State (Stmt);
else
Translate_For_Loop_Statement_Direct (Stmt);
end if;
Current_Loop := Prev_Loop;
end Translate_For_Loop_Statement;
procedure Translate_While_Loop_Statement (Stmt : Iir_While_Loop_Statement)
is
Cond : constant Iir := Get_Condition (Stmt);
Prev_Loop : Iir;
begin
Prev_Loop := Current_Loop;
Current_Loop := Stmt;
if Get_Suspend_Flag (Stmt) then
declare
Info : constant Loop_State_Info_Acc := Get_Info (Stmt);
Blk : O_If_Block;
begin
Info.Loop_State_Next := State_Allocate;
Info.Loop_State_Exit := State_Allocate;
-- NEXT_STATE:
State_Jump (Info.Loop_State_Next);
State_Start (Info.Loop_State_Next);
if Cond /= Null_Iir then
Info.Loop_State_Body := State_Allocate;
-- if COND then
-- goto BODY_STATE;
-- else
-- goto EXIT_STATE;
-- end if;
Open_Temp;
Start_If_Stmt (Blk, Chap7.Translate_Expression (Cond));
State_Jump (Info.Loop_State_Body);
New_Else_Stmt (Blk);
State_Jump (Info.Loop_State_Exit);
Finish_If_Stmt (Blk);
Close_Temp;
-- BODY_STATE:
State_Start (Info.Loop_State_Body);
end if;
Translate_Statements_Chain (Get_Sequential_Statement_Chain (Stmt));
-- goto NEXT_STATE
State_Jump (Info.Loop_State_Next);
-- EXIT_STATE:
State_Start (Info.Loop_State_Exit);
end;
else
declare
Info : Loop_Info_Acc;
begin
Info := Add_Info (Stmt, Kind_Loop);
Start_Loop_Stmt (Info.Label_Exit);
Info.Label_Next := O_Snode_Null;
Open_Temp;
if Cond /= Null_Iir then
Gen_Exit_When
(Info.Label_Exit,
New_Monadic_Op (ON_Not, Chap7.Translate_Expression (Cond)));
end if;
Close_Temp;
Translate_Statements_Chain (Get_Sequential_Statement_Chain (Stmt));
Finish_Loop_Stmt (Info.Label_Exit);
end;
end if;
Free_Info (Stmt);
Current_Loop := Prev_Loop;
end Translate_While_Loop_Statement;
procedure Translate_Exit_Next_Statement (Stmt : Iir)
is
Cond : constant Iir := Get_Condition (Stmt);
If_Blk : O_If_Block;
Info : Ortho_Info_Acc;
Loop_Label : Iir;
Loop_Stmt : Iir;
begin
Loop_Label := Get_Loop_Label (Stmt);
if Loop_Label = Null_Iir then
Loop_Stmt := Current_Loop;
else
Loop_Stmt := Get_Named_Entity (Loop_Label);
end if;
Info := Get_Info (Loop_Stmt);
-- Common part.
if Cond /= Null_Iir then
Start_If_Stmt (If_Blk, Chap7.Translate_Expression (Cond));
end if;
if Get_Suspend_Flag (Loop_Stmt) then
-- The corresponding loop is state based. Jump to the right state.
case Get_Kind (Stmt) is
when Iir_Kind_Exit_Statement =>
State_Jump (Info.Loop_State_Exit);
when Iir_Kind_Next_Statement =>
State_Jump (Info.Loop_State_Next);
when others =>
raise Internal_Error;
end case;
-- Force the jump, so that it would work even if the next/exit is
-- not immediately within a state construct. Example:
-- loop
-- if cond then
-- exit;
-- else
-- i := i + 1;
-- end if;
-- wait for 1 ns;
-- end loop;
-- A new state cannot be created here, as the outer construct is the
-- if statement and not the case statement for the state machine.
State_Jump_Force;
if Cond /= Null_Iir then
Finish_If_Stmt (If_Blk);
end if;
else
case Get_Kind (Stmt) is
when Iir_Kind_Exit_Statement =>
New_Exit_Stmt (Info.Label_Exit);
when Iir_Kind_Next_Statement =>
if Info.Label_Next /= O_Snode_Null then
-- For-loop.
New_Exit_Stmt (Info.Label_Next);
else
-- While-loop.
New_Next_Stmt (Info.Label_Exit);
end if;
when others =>
raise Internal_Error;
end case;
if Cond /= Null_Iir then
Finish_If_Stmt (If_Blk);
end if;
end if;
end Translate_Exit_Next_Statement;
procedure Translate_Variable_Aggregate_Assignment
(Targ : Iir; Targ_Type : Iir; Val : Mnode);
procedure Translate_Variable_Array_Aggr
(Targ : Iir_Aggregate;
Targ_Type : Iir;
Val : Mnode;
Index : in out Unsigned_64;
Dim : Natural)
is
El : Iir;
Final : Boolean;
El_Type : Iir;
begin
Final := Dim = Get_Nbr_Elements (Get_Index_Subtype_List (Targ_Type));
if Final then
El_Type := Get_Element_Subtype (Targ_Type);
end if;
El := Get_Association_Choices_Chain (Targ);
while El /= Null_Iir loop
case Get_Kind (El) is
when Iir_Kind_Choice_By_None =>
if Final then
Translate_Variable_Aggregate_Assignment
(Get_Associated_Expr (El), El_Type,
Chap3.Index_Base
(Val, Targ_Type,
New_Lit (New_Unsigned_Literal
(Ghdl_Index_Type, Index))));
Index := Index + 1;
else
Translate_Variable_Array_Aggr
(Get_Associated_Expr (El),
Targ_Type, Val, Index, Dim + 1);
end if;
when others =>
Error_Kind ("translate_variable_array_aggr", El);
end case;
El := Get_Chain (El);
end loop;
end Translate_Variable_Array_Aggr;
procedure Translate_Variable_Rec_Aggr
(Targ : Iir_Aggregate; Targ_Type : Iir; Val : Mnode)
is
Aggr_El : Iir;
El_List : Iir_List;
El_Index : Natural;
Elem : Iir;
begin
El_List := Get_Elements_Declaration_List (Get_Base_Type (Targ_Type));
El_Index := 0;
Aggr_El := Get_Association_Choices_Chain (Targ);
while Aggr_El /= Null_Iir loop
case Get_Kind (Aggr_El) is
when Iir_Kind_Choice_By_None =>
Elem := Get_Nth_Element (El_List, El_Index);
El_Index := El_Index + 1;
when Iir_Kind_Choice_By_Name =>
Elem := Get_Named_Entity (Get_Choice_Name (Aggr_El));
when others =>
Error_Kind ("translate_variable_rec_aggr", Aggr_El);
end case;
Translate_Variable_Aggregate_Assignment
(Get_Associated_Expr (Aggr_El), Get_Type (Elem),
Chap6.Translate_Selected_Element (Val, Elem));
Aggr_El := Get_Chain (Aggr_El);
end loop;
end Translate_Variable_Rec_Aggr;
procedure Translate_Variable_Aggregate_Assignment
(Targ : Iir; Targ_Type : Iir; Val : Mnode)
is
Index : Unsigned_64;
begin
if Get_Kind (Targ) = Iir_Kind_Aggregate then
case Get_Kind (Targ_Type) is
when Iir_Kinds_Array_Type_Definition =>
Index := 0;
Translate_Variable_Array_Aggr
(Targ, Targ_Type, Val, Index, 1);
when Iir_Kind_Record_Type_Definition
| Iir_Kind_Record_Subtype_Definition =>
Translate_Variable_Rec_Aggr (Targ, Targ_Type, Val);
when others =>
Error_Kind
("translate_variable_aggregate_assignment", Targ_Type);
end case;
else
declare
Targ_Node : Mnode;
begin
Targ_Node := Chap6.Translate_Name (Targ, Mode_Value);
Chap3.Translate_Object_Copy (Targ_Node, M2E (Val), Targ_Type);
end;
end if;
end Translate_Variable_Aggregate_Assignment;
procedure Translate_Variable_Assignment_Statement
(Stmt : Iir_Variable_Assignment_Statement)
is
Target : constant Iir := Get_Target (Stmt);
Targ_Type : constant Iir := Get_Type (Target);
Expr : constant Iir := Get_Expression (Stmt);
Targ_Node : Mnode;
begin
if Get_Kind (Target) = Iir_Kind_Aggregate then
declare
E : O_Enode;
Temp : Mnode;
begin
Chap3.Translate_Anonymous_Type_Definition (Targ_Type);
-- Use a temporary variable, to avoid overlap.
Temp := Create_Temp (Get_Info (Targ_Type));
Chap4.Allocate_Complex_Object (Targ_Type, Alloc_Stack, Temp);
E := Chap7.Translate_Expression (Expr, Targ_Type);
Chap3.Translate_Object_Copy (Temp, E, Targ_Type);
Translate_Variable_Aggregate_Assignment
(Target, Targ_Type, Temp);
return;
end;
else
Targ_Node := Chap6.Translate_Name (Target, Mode_Value);
if Get_Kind (Expr) = Iir_Kind_Aggregate then
declare
E : O_Enode;
begin
E := Chap7.Translate_Expression (Expr, Targ_Type);
Chap3.Translate_Object_Copy (Targ_Node, E, Targ_Type);
end;
else
Chap7.Translate_Assign (Targ_Node, Expr, Targ_Type);
end if;
end if;