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Diffstat (limited to 'src/sem_inst.adb')
| -rw-r--r-- | src/sem_inst.adb | 639 |
1 files changed, 639 insertions, 0 deletions
diff --git a/src/sem_inst.adb b/src/sem_inst.adb new file mode 100644 index 0000000..a9ba756 --- /dev/null +++ b/src/sem_inst.adb @@ -0,0 +1,639 @@ +-- Package (and subprograms) instantiations + +-- When a package is instantiated, we need to 'duplicate' its declaration. +-- This looks useless for analysis but it isn't: a type from a package +-- instantiated twice declares two different types. Without duplication, we +-- need to attach to each declaration its instance, which looks more expansive +-- that duplicating the declaration. +-- +-- Furthermore, for generic type interface, it looks a good idea to duplicate +-- the body (macro expansion). +-- +-- Duplicating is not trivial: internal links must be kept and external +-- links preserved. A table is used to map nodes from the uninstantiated +-- package to its duplicated node. Links from instantiated declaration to +-- the original declaration are also stored in that table. + +with GNAT.Table; +with Nodes; +with Nodes_Meta; +with Types; use Types; +with Iirs_Utils; use Iirs_Utils; +with Errorout; use Errorout; + +package body Sem_Inst is + -- Table of origin. This is an extension of vhdl nodes to track the + -- origin of a node. If a node has a non-null origin, then the node was + -- instantiated for the origin node. + -- + -- Furthermore, during instantiation, we need to keep track of instantiated + -- nodes (ie nodes created by instantiation) used by references. As an + -- instance cannot be uninstantiated, there is no collisions, as soon as + -- such entries are cleaned after instantiation. + -- + -- As an example, here are declarations of an uninstantiated package: + -- type Nat is range 0 to 1023; + -- constant N : Nat := 5; + -- A node Nat1 will be created from node Nat (an integer type definition). + -- The origin of Nat1 is Nat and this is true forever. During + -- instantiation, the instance of Nat is Nat1, so that the type of N will + -- be set to Nat1. + package Origin_Table is new GNAT.Table + (Table_Component_Type => Iir, + Table_Index_Type => Iir, + Table_Low_Bound => 2, + Table_Initial => 1024, + Table_Increment => 100); + + procedure Expand_Origin_Table + is + use Nodes; + Last : constant Iir := Iirs.Get_Last_Node; + El: Iir; + begin + El := Origin_Table.Last; + if El < Last then + Origin_Table.Set_Last (Last); + Origin_Table.Table (El + 1 .. Last) := (others => Null_Iir); + end if; + end Expand_Origin_Table; + + -- This is the public function; the table may not have been extended. + function Get_Origin (N : Iir) return Iir + is + -- Make the '<=' operator visible. + use Nodes; + begin + if N <= Origin_Table.Last then + return Origin_Table.Table (N); + else + return Null_Iir; + end if; + end Get_Origin; + + -- This is the private function: the table *must* have been extended. + function Get_Instance (N : Iir) return Iir + is + -- Make '<=' operator visible for the assert. + use Nodes; + begin + pragma Assert (N <= Origin_Table.Last); + return Origin_Table.Table (N); + end Get_Instance; + + procedure Set_Origin (N : Iir; Orig : Iir) is + begin + -- As nodes are created, we need to expand origin table. + Expand_Origin_Table; + + pragma Assert (Orig = Null_Iir + or else Origin_Table.Table (N) = Null_Iir); + Origin_Table.Table (N) := Orig; + end Set_Origin; + + type Instance_Entry_Type is record + -- Node + N : Iir; + + -- Old value in Origin_Table. + Old_Origin : Iir; + end record; + + type Instance_Index_Type is new Natural; + + -- Table of previous values in Origin_Table. The first purpose of this + -- table is to be able to revert the calls to Set_Instance, so that a unit + -- can be instantiated several times. Keep the nodes that have been + -- instantiated is cheaper than walking the tree a second time. + -- The second purpose of this table is not yet implemented: being able to + -- have uninstantiated packages in instantiated packages. In that case, + -- the slot in Origin_Table cannot be the origin and the instance at the + -- same time. + package Prev_Instance_Table is new GNAT.Table + (Table_Component_Type => Instance_Entry_Type, + Table_Index_Type => Instance_Index_Type, + Table_Low_Bound => 1, + Table_Initial => 256, + Table_Increment => 100); + + procedure Set_Instance (Orig : Iir; N : Iir) + is + use Nodes; + begin + pragma Assert (Orig <= Origin_Table.Last); + + -- Save the old entry + Prev_Instance_Table.Append + (Instance_Entry_Type'(N => Orig, + Old_Origin => Origin_Table.Table (Orig))); + + -- Set the entry. + Origin_Table.Table (Orig) := N; + end Set_Instance; + + procedure Restore_Origin (Mark : Instance_Index_Type) is + begin + for I in reverse Mark + 1 .. Prev_Instance_Table.Last loop + declare + El : Instance_Entry_Type renames Prev_Instance_Table.Table (I); + begin + Origin_Table.Table (El.N) := El.Old_Origin; + end; + end loop; + Prev_Instance_Table.Set_Last (Mark); + end Restore_Origin; + + -- The location to be used while instantiated nodes. + Instantiate_Loc : Location_Type; + + function Instantiate_Iir (N : Iir; Is_Ref : Boolean) return Iir; + + -- Instantiate a list. Simply create a new list and instantiate nodes of + -- that list. + function Instantiate_Iir_List (L : Iir_List; Is_Ref : Boolean) + return Iir_List + is + Res : Iir_List; + El : Iir; + begin + case L is + when Null_Iir_List + | Iir_List_All + | Iir_List_Others => + return L; + when others => + Res := Create_Iir_List; + for I in Natural loop + El := Get_Nth_Element (L, I); + exit when El = Null_Iir; + Append_Element (Res, Instantiate_Iir (El, Is_Ref)); + end loop; + return Res; + end case; + end Instantiate_Iir_List; + + -- Instantiate a chain. This is a special case to reduce stack depth. + function Instantiate_Iir_Chain (N : Iir) return Iir + is + First : Iir; + Last : Iir; + Next_N : Iir; + Next_R : Iir; + begin + if N = Null_Iir then + return Null_Iir; + end if; + + First := Instantiate_Iir (N, False); + Last := First; + Next_N := Get_Chain (N); + while Next_N /= Null_Iir loop + Next_R := Instantiate_Iir (Next_N, False); + Set_Chain (Last, Next_R); + Last := Next_R; + Next_N := Get_Chain (Next_N); + end loop; + + return First; + end Instantiate_Iir_Chain; + + procedure Instantiate_Iir_Field + (Res : Iir; N : Iir; F : Nodes_Meta.Fields_Enum) + is + use Nodes_Meta; + begin + case Get_Field_Type (F) is + when Type_Iir => + declare + S : constant Iir := Get_Iir (N, F); + R : Iir; + begin + case Get_Field_Attribute (F) is + when Attr_None => + R := Instantiate_Iir (S, False); + when Attr_Ref => + R := Instantiate_Iir (S, True); + when Attr_Maybe_Ref => + R := Instantiate_Iir (S, Get_Is_Ref (N)); + when Attr_Chain => + R := Instantiate_Iir_Chain (S); + when Attr_Chain_Next => + R := Null_Iir; + when Attr_Of_Ref => + -- Can only appear in list. + raise Internal_Error; + end case; + Set_Iir (Res, F, R); + end; + when Type_Iir_List => + declare + S : constant Iir_List := Get_Iir_List (N, F); + R : Iir_List; + begin + case Get_Field_Attribute (F) is + when Attr_None => + R := Instantiate_Iir_List (S, False); + when Attr_Of_Ref => + R := Instantiate_Iir_List (S, True); + when others => + -- Ref is specially handled in Instantiate_Iir. + -- Others cannot appear for lists. + raise Internal_Error; + end case; + Set_Iir_List (Res, F, R); + end; + when Type_PSL_NFA + | Type_PSL_Node => + -- TODO + raise Internal_Error; + when Type_String_Id => + Set_String_Id (Res, F, Get_String_Id (N, F)); + when Type_Source_Ptr => + Set_Source_Ptr (Res, F, Get_Source_Ptr (N, F)); + when Type_Date_Type + | Type_Date_State_Type + | Type_Time_Stamp_Id => + -- Can this happen ? + raise Internal_Error; + when Type_Base_Type => + Set_Base_Type (Res, F, Get_Base_Type (N, F)); + when Type_Iir_Constraint => + Set_Iir_Constraint (Res, F, Get_Iir_Constraint (N, F)); + when Type_Iir_Mode => + Set_Iir_Mode (Res, F, Get_Iir_Mode (N, F)); + when Type_Iir_Index32 => + Set_Iir_Index32 (Res, F, Get_Iir_Index32 (N, F)); + when Type_Iir_Int64 => + Set_Iir_Int64 (Res, F, Get_Iir_Int64 (N, F)); + when Type_Boolean => + Set_Boolean (Res, F, Get_Boolean (N, F)); + when Type_Iir_Staticness => + Set_Iir_Staticness (Res, F, Get_Iir_Staticness (N, F)); + when Type_Iir_All_Sensitized => + Set_Iir_All_Sensitized (Res, F, Get_Iir_All_Sensitized (N, F)); + when Type_Iir_Signal_Kind => + Set_Iir_Signal_Kind (Res, F, Get_Iir_Signal_Kind (N, F)); + when Type_Tri_State_Type => + Set_Tri_State_Type (Res, F, Get_Tri_State_Type (N, F)); + when Type_Iir_Pure_State => + Set_Iir_Pure_State (Res, F, Get_Iir_Pure_State (N, F)); + when Type_Iir_Delay_Mechanism => + Set_Iir_Delay_Mechanism (Res, F, Get_Iir_Delay_Mechanism (N, F)); + when Type_Iir_Lexical_Layout_Type => + Set_Iir_Lexical_Layout_Type + (Res, F, Get_Iir_Lexical_Layout_Type (N, F)); + when Type_Iir_Predefined_Functions => + Set_Iir_Predefined_Functions + (Res, F, Get_Iir_Predefined_Functions (N, F)); + when Type_Iir_Direction => + Set_Iir_Direction (Res, F, Get_Iir_Direction (N, F)); + when Type_Location_Type => + Set_Location_Type (Res, F, Instantiate_Loc); + when Type_Iir_Int32 => + Set_Iir_Int32 (Res, F, Get_Iir_Int32 (N, F)); + when Type_Int32 => + Set_Int32 (Res, F, Get_Int32 (N, F)); + when Type_Iir_Fp64 => + Set_Iir_Fp64 (Res, F, Get_Iir_Fp64 (N, F)); + when Type_Token_Type => + Set_Token_Type (Res, F, Get_Token_Type (N, F)); + when Type_Name_Id => + Set_Name_Id (Res, F, Get_Name_Id (N, F)); + end case; + end Instantiate_Iir_Field; + + function Instantiate_Iir (N : Iir; Is_Ref : Boolean) return Iir + is + Res : Iir; + begin + -- Nothing to do for null node. + if N = Null_Iir then + return Null_Iir; + end if; + + -- For a reference, do not create a new node. + if Is_Ref then + Res := Get_Instance (N); + if Res /= Null_Iir then + -- There is an instance for N. + return Res; + else + -- Reference outside the instance. + return N; + end if; + end if; + + declare + use Nodes_Meta; + Kind : constant Iir_Kind := Get_Kind (N); + Fields : constant Fields_Array := Get_Fields (Kind); + F : Fields_Enum; + begin + Res := Get_Instance (N); + + if Kind = Iir_Kind_Interface_Constant_Declaration + and then Get_Identifier (N) = Null_Identifier + and then Res /= Null_Iir + then + -- Anonymous constant interface declarations are the only nodes + -- that can be shared. Handle that very special case. + return Res; + end if; + + pragma Assert (Res = Null_Iir); + + -- Create a new node. + Res := Create_Iir (Kind); + + -- The origin of this new node is N. + Set_Origin (Res, N); + + -- And the instance of N is RES. + Set_Instance (N, Res); + + Set_Location (Res, Instantiate_Loc); + + for I in Fields'Range loop + F := Fields (I); + + -- Fields that are handled specially. + case F is + when Field_Index_Subtype_List => + -- Index_Subtype_List is always a reference, so retrieve + -- the instance of the referenced list. This is a special + -- case because there is no origins for list. + declare + List : Iir_List; + begin + case Kind is + when Iir_Kind_Array_Type_Definition => + List := Get_Index_Subtype_Definition_List (Res); + when Iir_Kind_Array_Subtype_Definition => + List := Get_Index_Constraint_List (Res); + if List = Null_Iir_List then + List := Get_Index_Subtype_List + (Get_Denoted_Type_Mark (Res)); + end if; + when others => + -- All the nodes where Index_Subtype_List appears + -- are handled above. + raise Internal_Error; + end case; + Set_Index_Subtype_List (Res, List); + end; + + when others => + -- Common case. + Instantiate_Iir_Field (Res, N, F); + end case; + end loop; + + case Kind is + when Iir_Kind_Function_Declaration + | Iir_Kind_Procedure_Declaration => + -- Subprogram body is a forward declaration. + Set_Subprogram_Body (Res, Null_Iir); + when others => + -- TODO: other forward references: + -- incomplete constant + -- attribute_value + null; + end case; + + return Res; + end; + end Instantiate_Iir; + + -- As the scope generic interfaces extends beyond the immediate scope (see + -- LRM08 12.2 Scope of declarations), they must be instantiated. + function Instantiate_Generic_Chain (Inst : Iir; Inters : Iir) return Iir + is + Inter : Iir; + First : Iir; + Last : Iir; + Res : Iir; + begin + First := Null_Iir; + Last := Null_Iir; + + Inter := Inters; + while Inter /= Null_Iir loop + -- Create a copy of the interface. FIXME: is it really needed ? + Res := Create_Iir (Get_Kind (Inter)); + Set_Location (Res, Instantiate_Loc); + Set_Parent (Res, Inst); + Set_Identifier (Res, Get_Identifier (Inter)); + Set_Visible_Flag (Res, Get_Visible_Flag (Inter)); + + Set_Origin (Res, Inter); + Set_Instance (Inter, Res); + + case Get_Kind (Res) is + when Iir_Kind_Interface_Constant_Declaration => + Set_Type (Res, Get_Type (Inter)); + Set_Subtype_Indication (Res, Get_Subtype_Indication (Inter)); + Set_Mode (Res, Get_Mode (Inter)); + Set_Lexical_Layout (Res, Get_Lexical_Layout (Inter)); + Set_Expr_Staticness (Res, Get_Expr_Staticness (Inter)); + Set_Name_Staticness (Res, Get_Name_Staticness (Inter)); + when Iir_Kind_Interface_Package_Declaration => + Set_Uninstantiated_Package_Name + (Res, Get_Uninstantiated_Package_Name (Inter)); + when others => + Error_Kind ("instantiate_generic_chain", Res); + end case; + + -- Append + if First = Null_Iir then + First := Res; + else + Set_Chain (Last, Res); + end if; + Last := Res; + + Inter := Get_Chain (Inter); + end loop; + + return First; + end Instantiate_Generic_Chain; + + procedure Set_Instance_On_Chain (Chain : Iir; Inst_Chain : Iir); + procedure Set_Instance_On_Iir_List (N : Iir_List; Inst : Iir_List); + + procedure Set_Instance_On_Iir (N : Iir; Inst : Iir) is + begin + if N = Null_Iir then + pragma Assert (Inst = Null_Iir); + return; + end if; + pragma Assert (Inst /= Null_Iir); + + declare + use Nodes_Meta; + Kind : constant Iir_Kind := Get_Kind (N); + Fields : constant Fields_Array := Get_Fields (Kind); + F : Fields_Enum; + begin + pragma Assert (Get_Kind (Inst) = Kind); + + if Kind = Iir_Kind_Interface_Constant_Declaration + and then Get_Identifier (N) = Null_Identifier + then + -- Anonymous constant interface declarations are the only nodes + -- that can be shared. Handle that very special case. + return; + end if; + + -- pragma Assert (Get_Instance (N) = Null_Iir); + Set_Instance (N, Inst); + + for I in Fields'Range loop + F := Fields (I); + + case Get_Field_Type (F) is + when Type_Iir => + declare + S : constant Iir := Get_Iir (N, F); + S_Inst : constant Iir := Get_Iir (Inst, F); + begin + case Get_Field_Attribute (F) is + when Attr_None => + Set_Instance_On_Iir (S, S_Inst); + when Attr_Ref => + null; + when Attr_Maybe_Ref => + if not Get_Is_Ref (N) then + Set_Instance_On_Iir (S, S_Inst); + end if; + when Attr_Chain => + Set_Instance_On_Chain (S, S_Inst); + when Attr_Chain_Next => + null; + when Attr_Of_Ref => + -- Can only appear in list. + raise Internal_Error; + end case; + end; + when Type_Iir_List => + declare + S : constant Iir_List := Get_Iir_List (N, F); + S_Inst : constant Iir_List := Get_Iir_List (Inst, F); + begin + case Get_Field_Attribute (F) is + when Attr_None => + Set_Instance_On_Iir_List (S, S_Inst); + when Attr_Of_Ref + | Attr_Ref => + null; + when others => + -- Ref is specially handled in Instantiate_Iir. + -- Others cannot appear for lists. + raise Internal_Error; + end case; + end; + when others => + null; + end case; + end loop; + end; + end Set_Instance_On_Iir; + + procedure Set_Instance_On_Iir_List (N : Iir_List; Inst : Iir_List) + is + El : Iir; + El_Inst : Iir; + begin + case N is + when Null_Iir_List + | Iir_List_All + | Iir_List_Others => + pragma Assert (Inst = N); + return; + when others => + for I in Natural loop + El := Get_Nth_Element (N, I); + El_Inst := Get_Nth_Element (Inst, I); + exit when El = Null_Iir; + pragma Assert (El_Inst /= Null_Iir); + + Set_Instance_On_Iir (El, El_Inst); + end loop; + pragma Assert (El_Inst = Null_Iir); + end case; + end Set_Instance_On_Iir_List; + + procedure Set_Instance_On_Chain (Chain : Iir; Inst_Chain : Iir) + is + El : Iir; + Inst_El : Iir; + begin + El := Chain; + Inst_El := Inst_Chain; + while El /= Null_Iir loop + pragma Assert (Inst_El /= Null_Iir); + Set_Instance_On_Iir (El, Inst_El); + El := Get_Chain (El); + Inst_El := Get_Chain (Inst_El); + end loop; + pragma Assert (Inst_El = Null_Iir); + end Set_Instance_On_Chain; + + -- In the instance, replace references (and inner references) to interface + -- package declaration to the associated package. + procedure Instantiate_Generic_Map_Chain (Inst : Iir; Pkg : Iir) + is + pragma Unreferenced (Pkg); + Assoc : Iir; + begin + Assoc := Get_Generic_Map_Aspect_Chain (Inst); + while Assoc /= Null_Iir loop + case Get_Kind (Assoc) is + when Iir_Kind_Association_Element_By_Expression + | Iir_Kind_Association_Element_By_Individual + | Iir_Kind_Association_Element_Open => + null; + when Iir_Kind_Association_Element_Package => + declare + Sub_Inst : constant Iir := + Get_Named_Entity (Get_Actual (Assoc)); + Sub_Pkg : constant Iir := Get_Associated_Interface (Assoc); + begin + Set_Instance (Sub_Pkg, Sub_Inst); + Set_Instance_On_Chain (Get_Generic_Chain (Sub_Pkg), + Get_Generic_Chain (Sub_Inst)); + Set_Instance_On_Chain (Get_Declaration_Chain (Sub_Pkg), + Get_Declaration_Chain (Sub_Inst)); + end; + when others => + Error_Kind ("instantiate_generic_map_chain", Assoc); + end case; + Assoc := Get_Chain (Assoc); + end loop; + end Instantiate_Generic_Map_Chain; + + procedure Instantiate_Package_Declaration (Inst : Iir; Pkg : Iir) + is + Header : constant Iir := Get_Package_Header (Pkg); + Prev_Loc : constant Location_Type := Instantiate_Loc; + Mark : constant Instance_Index_Type := Prev_Instance_Table.Last; + begin + Instantiate_Loc := Get_Location (Inst); + + -- Be sure Get_Origin_Priv can be called on existing nodes. + Expand_Origin_Table; + + -- For Parent: the instance of PKG is INST. + Set_Origin (Pkg, Inst); + + Set_Generic_Chain + (Inst, Instantiate_Generic_Chain (Inst, Get_Generic_Chain (Header))); + Instantiate_Generic_Map_Chain (Inst, Pkg); + Set_Declaration_Chain + (Inst, Instantiate_Iir_Chain (Get_Declaration_Chain (Pkg))); + + Set_Origin (Pkg, Null_Iir); + + Instantiate_Loc := Prev_Loc; + Restore_Origin (Mark); + end Instantiate_Package_Declaration; +end Sem_Inst; |