diff options
Diffstat (limited to 'src/sem.adb')
| -rw-r--r-- | src/sem.adb | 2749 |
1 files changed, 2749 insertions, 0 deletions
diff --git a/src/sem.adb b/src/sem.adb new file mode 100644 index 0000000..e82bd72 --- /dev/null +++ b/src/sem.adb @@ -0,0 +1,2749 @@ +-- Semantic analysis pass. +-- Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold +-- +-- GHDL is free software; you can redistribute it and/or modify it under +-- the terms of the GNU General Public License as published by the Free +-- Software Foundation; either version 2, or (at your option) any later +-- version. +-- +-- GHDL is distributed in the hope that it will be useful, but WITHOUT ANY +-- WARRANTY; without even the implied warranty of MERCHANTABILITY or +-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +-- for more details. +-- +-- You should have received a copy of the GNU General Public License +-- along with GHDL; see the file COPYING. If not, write to the Free +-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA +-- 02111-1307, USA. +with Ada.Unchecked_Conversion; +with Errorout; use Errorout; +with Std_Package; use Std_Package; +with Ieee.Std_Logic_1164; +with Libraries; +with Std_Names; +with Sem_Scopes; use Sem_Scopes; +with Sem_Expr; use Sem_Expr; +with Sem_Names; use Sem_Names; +with Sem_Specs; use Sem_Specs; +with Sem_Decls; use Sem_Decls; +with Sem_Assocs; use Sem_Assocs; +with Sem_Inst; +with Iirs_Utils; use Iirs_Utils; +with Flags; use Flags; +with Name_Table; +with Str_Table; +with Sem_Stmts; use Sem_Stmts; +with Iir_Chains; +with Xrefs; use Xrefs; + +package body Sem is + -- Forward declarations. + procedure Sem_Context_Clauses (Design_Unit: Iir_Design_Unit); + procedure Sem_Block_Configuration + (Block_Conf : Iir_Block_Configuration; Father: Iir); + procedure Sem_Component_Configuration + (Conf : Iir_Component_Configuration; Father : Iir); + + procedure Add_Dependence (Unit : Iir) + is + Targ : constant Iir := Get_Current_Design_Unit; + begin + -- During normal analysis, there is a current design unit. But not + -- during debugging outside of any context. + if Targ = Null_Iir then + return; + end if; + + Add_Dependence (Targ, Unit); + end Add_Dependence; + + -- LRM 1.1 Entity declaration. + procedure Sem_Entity_Declaration (Entity: Iir_Entity_Declaration) is + begin + Xrefs.Xref_Decl (Entity); + Sem_Scopes.Add_Name (Entity); + Set_Visible_Flag (Entity, True); + + Set_Is_Within_Flag (Entity, True); + + -- LRM 10.1 + -- 1. An entity declaration, together with a corresponding architecture + -- body. + Open_Declarative_Region; + + -- Sem generics. + Sem_Interface_Chain (Get_Generic_Chain (Entity), Generic_Interface_List); + + -- Sem ports. + Sem_Interface_Chain (Get_Port_Chain (Entity), Port_Interface_List); + + -- Entity declarative part and concurrent statements. + Sem_Block (Entity, True); + + Close_Declarative_Region; + Set_Is_Within_Flag (Entity, False); + end Sem_Entity_Declaration; + + -- Get the entity unit for LIBRARY_UNIT (an architecture or a + -- configuration declaration). + -- Return NULL_IIR in case of error (not found, bad library). + function Sem_Entity_Name (Library_Unit : Iir) return Iir + is + Name : Iir; + Library : Iir_Library_Declaration; + Entity : Iir; + begin + -- Get the library of architecture/configuration. + Library := Get_Library + (Get_Design_File (Get_Design_Unit (Library_Unit))); + + -- Resolve the name. + + Name := Get_Entity_Name (Library_Unit); + if Get_Kind (Name) = Iir_Kind_Simple_Name then + -- LRM93 10.1 Declarative Region + -- LRM08 12.1 Declarative Region + -- a) An entity declaration, tohether with a corresponding + -- architecture body. + -- + -- GHDL: simple name needs to be handled specially. Because + -- architecture body is in the declarative region of its entity, + -- the entity name is directly visible. But we cannot really use + -- that rule as is, as we don't know which is the entity. + Entity := Libraries.Load_Primary_Unit + (Library, Get_Identifier (Name), Library_Unit); + if Entity = Null_Iir then + Error_Msg_Sem ("entity " & Disp_Node (Name) & " was not analysed", + Library_Unit); + return Null_Iir; + end if; + Entity := Get_Library_Unit (Entity); + Set_Named_Entity (Name, Entity); + Xrefs.Xref_Ref (Name, Entity); + else + -- Certainly an expanded name. Use the standard name analysis. + Name := Sem_Denoting_Name (Name); + Set_Entity_Name (Library_Unit, Name); + Entity := Get_Named_Entity (Name); + end if; + + if Get_Kind (Entity) /= Iir_Kind_Entity_Declaration then + Error_Class_Match (Name, "entity"); + return Null_Iir; + end if; + + -- LRM 1.2 Architecture bodies + -- For a given design entity, both the entity declaration and the + -- associated architecture body must reside in the same library. + + -- LRM 1.3 Configuration Declarations + -- For a configuration of a given design entity, both the + -- configuration declaration and the corresponding entity + -- declaration must reside in the same library. + if Get_Library (Get_Design_File (Get_Design_Unit (Entity))) /= Library + then + Error_Msg_Sem + (Disp_Node (Entity) & " does not reside in " + & Disp_Node (Library), Library_Unit); + return Null_Iir; + end if; + + return Entity; + end Sem_Entity_Name; + + -- LRM 1.2 Architecture bodies. + procedure Sem_Architecture_Body (Arch: Iir_Architecture_Body) + is + Entity_Unit : Iir_Design_Unit; + Entity_Library : Iir_Entity_Declaration; + begin + Xrefs.Xref_Decl (Arch); + -- First, find the entity. + Entity_Library := Sem_Entity_Name (Arch); + if Entity_Library = Null_Iir then + return; + end if; + Entity_Unit := Get_Design_Unit (Entity_Library); + + -- LRM93 11.4 + -- In each case, the second unit depends on the first unit. + -- GHDL: an architecture depends on its entity. + Add_Dependence (Entity_Unit); + + Add_Context_Clauses (Entity_Unit); + + Set_Is_Within_Flag (Arch, True); + Set_Is_Within_Flag (Entity_Library, True); + + -- Makes the entity name visible. + -- FIXME: quote LRM. + Sem_Scopes.Add_Name + (Entity_Library, Get_Identifier (Entity_Library), False); + + -- LRM 10.1 Declarative Region + -- 1. An entity declaration, together with a corresponding architecture + -- body. + Open_Declarative_Region; + Sem_Scopes.Add_Entity_Declarations (Entity_Library); + + -- LRM02 1.2 Architecture bodies + -- For the purpose of interpreting the scope and visibility of the + -- identifier (see 10.2 and 10.3), the declaration of the identifier is + -- considered to occur after the final declarative item of the entity + -- declarative part of the corresponding entity declaration. + -- + -- FIXME: before VHDL-02, an architecture is not a declaration. + Sem_Scopes.Add_Name (Arch, Get_Identifier (Arch), True); + Set_Visible_Flag (Arch, True); + + -- LRM02 10.1 Declarative region + -- The declarative region associated with an architecture body is + -- considered to occur immediatly within the declarative region + -- associated with the entity declaration corresponding to the given + -- architecture body. + if Vhdl_Std >= Vhdl_02 then + Open_Declarative_Region; + end if; + Sem_Block (Arch, True); + if Vhdl_Std >= Vhdl_02 then + Close_Declarative_Region; + end if; + + Close_Declarative_Region; + Set_Is_Within_Flag (Arch, False); + Set_Is_Within_Flag (Entity_Library, False); + end Sem_Architecture_Body; + + -- Return the real resolver used for (sub) object OBJ. + -- Return NULL_IIR if none. + function Get_Resolver (Obj : Iir) return Iir + is + Obj_Type : Iir; + Res : Iir; + begin + case Get_Kind (Obj) is + when Iir_Kind_Indexed_Name + | Iir_Kind_Slice_Name + | Iir_Kind_Selected_Element => + Res := Get_Resolver (Get_Prefix (Obj)); + if Res /= Null_Iir then + return Res; + end if; + when Iir_Kind_Signal_Declaration + | Iir_Kind_Interface_Signal_Declaration + | Iir_Kind_Guard_Signal_Declaration => + null; + when Iir_Kind_Object_Alias_Declaration => + return Get_Resolver (Get_Name (Obj)); + when Iir_Kind_Simple_Name + | Iir_Kind_Selected_Name => + return Get_Resolver (Get_Named_Entity (Obj)); + when others => + Error_Kind ("get_resolved", Obj); + end case; + + Obj_Type := Get_Type (Obj); + if Get_Kind (Obj_Type) in Iir_Kinds_Subtype_Definition then + return Get_Resolution_Indication (Obj_Type); + else + return Null_Iir; + end if; + end Get_Resolver; + + -- Return TRUE iff the actual of ASSOC can be the formal. + -- ASSOC must be an association_element_by_expression. + function Can_Collapse_Signals (Assoc : Iir; Formal : Iir) return Boolean + is + Actual : Iir; + Actual_Res : Iir; + Formal_Res : Iir; + Formal_Base : Iir; + Actual_Base : Iir; + begin + -- If there is a conversion, signals types are not necessarily + -- the same, and sharing is not possible. + -- FIXME: optimize type conversions + -- (unsigned <-> signed <-> std_ulogic_vector <-> ...) + if Get_In_Conversion (Assoc) /= Null_Iir + or else Get_Out_Conversion (Assoc) /= Null_Iir + then + return False; + end if; + + -- Here we may assume formal and actual have the same type and the + -- same lengths. This is caught at elaboration time. + + Actual := Name_To_Object (Get_Actual (Assoc)); + if Actual = Null_Iir then + -- This is an expression. + return False; + end if; + + Formal_Base := Get_Object_Prefix (Formal); + Actual_Base := Get_Object_Prefix (Actual); + + -- If the formal is of mode IN, then it has no driving value, and its + -- effective value is the effective value of the actual. + -- Always collapse in this case. + if Get_Mode (Formal_Base) = Iir_In_Mode then + return True; + end if; + + -- Otherwise, these rules are applied: + -- + -- In this table, E means element, S means signal. + -- Er means the element is resolved, + -- Sr means the signal is resolved (at the signal level). + -- + -- Actual + -- | E,S | Er,S | E,Sr | Er,Sr | + -- ------+-------+-------+-------+-------+ + -- E,S |collap | no(3) | no(3) | no(3) | + -- ------+-------+-------+-------+-------+ + -- Er,S | no(1) |if same| no(2) | no(2) | + -- Formal ------+-------+-------+-------+-------+ + -- E,Sr | no(1) | no(2) |if same| no(4) | + -- ------+-------+-------+-------+-------+ + -- Er,Sr | no(1) | no(2) | no(4) |if same| + -- ------+-------+-------+-------+-------+ + -- + -- Notes: (1): formal may have several sources. + -- (2): resolver is not the same. + -- (3): this prevents to catch several sources error in instance. + -- (4): resolver is not the same, because the types are not the + -- same. + -- + -- Furthermore, signals cannot be collapsed if the kind (none, bus or + -- register) is not the same. + -- + -- Default value: default value is the effective value. + + -- Resolution function. + Actual_Res := Get_Resolver (Actual); + Formal_Res := Get_Resolver (Formal); + + -- If the resolutions are not the same, signals cannot be collapsed. + if Actual_Res /= Formal_Res then + return False; + end if; + + -- If neither the actual nor the formal is resolved, then collapsing is + -- possible. + -- (this is case ES/ES). + if Actual_Res = Null_Iir and Formal_Res = Null_Iir then + return True; + end if; + + -- If the formal can have sources and is guarded, but the actual is + -- not guarded (or has not the same kind of guard), signals cannot + -- be collapsed. + if Get_Signal_Kind (Formal_Base) /= Get_Signal_Kind (Actual_Base) then + return False; + end if; + + return True; + end Can_Collapse_Signals; + + -- INTER_PARENT contains generics interfaces; + -- ASSOC_PARENT constains generic aspects. + function Sem_Generic_Association_Chain + (Inter_Parent : Iir; Assoc_Parent : Iir) return Boolean + is + El : Iir; + Match : Boolean; + Assoc_Chain : Iir; + Inter_Chain : Iir; + Miss : Missing_Type; + begin + -- LRM08 6.5.6.2 Generic clauses + -- If no such actual is specified for a given formal generic constant + -- (either because the formal generic is unassociated or because the + -- actual is open), and if a default expression is specified for that + -- generic, the value of this expression is the value of the generic. + -- It is an error if no actual is specified for a given formal generic + -- constant and no default expression is present in the corresponding + -- interface element. + + -- Note: CHECK_MATCH argument of sem_subprogram_arguments must be + -- true if parent is a component instantiation. + case Get_Kind (Assoc_Parent) is + when Iir_Kind_Component_Instantiation_Statement => + -- LRM 9.6 Component Instantiation Statement + -- Each local generic (or subelement or slice thereof) must be + -- associated {VHDL87: exactly}{VHDL93: at most} once. + -- ... + -- Each local port (or subelement or slice therof) must be + -- associated {VHDL87: exactly}{VHDL93: at most} once. + + -- GHDL: for a direct instantiation, follow rules of + -- LRM 1.1.1.1 Generic and LRM 1.1.1.2 Ports. + if Flags.Vhdl_Std = Vhdl_87 + or else Get_Kind (Inter_Parent) = Iir_Kind_Entity_Declaration + then + Miss := Missing_Generic; + else + Miss := Missing_Allowed; + end if; + when Iir_Kind_Binding_Indication => + -- LRM 5.2.1.2 Generic map and port map aspects + Miss := Missing_Allowed; + when Iir_Kind_Block_Header => + Miss := Missing_Generic; + when Iir_Kind_Package_Instantiation_Declaration => + -- LRM08 4.9 + -- Each formal generic (or member thereof) shall be associated + -- at most once. + Miss := Missing_Generic; + when others => + Error_Kind ("sem_generic_association_list", Assoc_Parent); + end case; + + -- The generics + Inter_Chain := Get_Generic_Chain (Inter_Parent); + Assoc_Chain := Get_Generic_Map_Aspect_Chain (Assoc_Parent); + + -- Extract non-object associations, as the actual cannot be analyzed + -- as an expression. + Assoc_Chain := Extract_Non_Object_Association (Assoc_Chain, Inter_Chain); + Set_Generic_Map_Aspect_Chain (Assoc_Parent, Assoc_Chain); + + if not Sem_Actual_Of_Association_Chain (Assoc_Chain) then + return False; + end if; + + Sem_Association_Chain + (Inter_Chain, Assoc_Chain, True, Miss, Assoc_Parent, Match); + Set_Generic_Map_Aspect_Chain (Assoc_Parent, Assoc_Chain); + if not Match then + return False; + end if; + + -- LRM 5.2.1.2 Generic map and port map aspects + -- An actual associated with a formal generic map aspect must be an + -- expression or the reserved word open; + El := Assoc_Chain; + while El /= Null_Iir loop + case Get_Kind (El) is + when Iir_Kind_Association_Element_By_Expression => + Check_Read (Get_Actual (El)); + when Iir_Kind_Association_Element_Open + | Iir_Kind_Association_Element_By_Individual + | Iir_Kind_Association_Element_Package => + null; + when others => + Error_Kind ("sem_generic_map_association_chain(1)", El); + end case; + El := Get_Chain (El); + end loop; + + return True; + end Sem_Generic_Association_Chain; + + procedure Sem_Generic_Association_Chain + (Inter_Parent : Iir; Assoc_Parent : Iir) + is + Res : Boolean; + pragma Unreferenced (Res); + begin + Res := Sem_Generic_Association_Chain (Inter_Parent, Assoc_Parent); + end Sem_Generic_Association_Chain; + + -- INTER_PARENT contains ports interfaces; + -- ASSOC_PARENT constains ports map aspects. + procedure Sem_Port_Association_Chain + (Inter_Parent : Iir; Assoc_Parent : Iir) + is + El : Iir; + Actual : Iir; + Prefix : Iir; + Object : Iir; + Match : Boolean; + Assoc_Chain : Iir; + Miss : Missing_Type; + Inter : Iir; + Formal : Iir; + Formal_Base : Iir; + begin + -- Note: CHECK_MATCH argument of sem_subprogram_arguments must be + -- true if parent is a component instantiation. + case Get_Kind (Assoc_Parent) is + when Iir_Kind_Component_Instantiation_Statement => + -- LRM 9.6 Component Instantiation Statement + -- Each local generic (or subelement or slice thereof) must be + -- associated {VHDL87: exactly}{VHDL93: at most} once. + -- ... + -- Each local port (or subelement or slice therof) must be + -- associated {VHDL87: exactly}{VHDL93: at most} once. + + -- GHDL: for a direct instantiation, follow rules of + -- LRM 1.1.1.1 Generic and LRM 1.1.1.2 Ports. + if Flags.Vhdl_Std = Vhdl_87 + or else Get_Kind (Inter_Parent) = Iir_Kind_Entity_Declaration + then + Miss := Missing_Port; + else + Miss := Missing_Allowed; + end if; + when Iir_Kind_Binding_Indication => + -- LRM 5.2.1.2 Generic map and port map aspects + Miss := Missing_Allowed; + when Iir_Kind_Block_Header => + -- FIXME: it is possible to have port unassociated ? + Miss := Missing_Port; + when others => + Error_Kind ("sem_port_association_list", Assoc_Parent); + end case; + + -- The ports + Assoc_Chain := Get_Port_Map_Aspect_Chain (Assoc_Parent); + if not Sem_Actual_Of_Association_Chain (Assoc_Chain) then + return; + end if; + Sem_Association_Chain (Get_Port_Chain (Inter_Parent), Assoc_Chain, + True, Miss, Assoc_Parent, Match); + Set_Port_Map_Aspect_Chain (Assoc_Parent, Assoc_Chain); + if not Match then + return; + end if; + + -- LRM 5.2.1.2 Generic map and port map aspects + -- [...]; an actual associated with a formal port in a port map aspect + -- must be a signal, an expression, or the reserved word open. + -- + -- Certain restriction apply to the actual associated with a formal in + -- a port map aspect; these restrictions are described in 1.1.1.2 + + -- LRM93 1.1.1.2 + -- The actual, if a port or signal, must be denoted by a static name. + -- The actual, if an expression, must be a globally static expression. + El := Assoc_Chain; + Inter := Get_Port_Chain (Inter_Parent); + while El /= Null_Iir loop + Formal := Get_Formal (El); + + if Formal = Null_Iir then + -- No formal: use association by position. + Formal := Inter; + Formal_Base := Inter; + Inter := Get_Chain (Inter); + else + Inter := Null_Iir; + Formal_Base := Get_Association_Interface (El); + end if; + + if Get_Kind (El) = Iir_Kind_Association_Element_By_Expression then + Actual := Get_Actual (El); + -- There has been an error, exit from the loop. + exit when Actual = Null_Iir; + Object := Name_To_Object (Actual); + if Object = Null_Iir then + Prefix := Actual; + else + Prefix := Get_Object_Prefix (Object); + end if; + case Get_Kind (Prefix) is + when Iir_Kind_Signal_Declaration + | Iir_Kind_Interface_Signal_Declaration + | Iir_Kind_Guard_Signal_Declaration + | Iir_Kinds_Signal_Attribute => + -- Port or signal. + Set_Collapse_Signal_Flag + (El, Can_Collapse_Signals (El, Formal)); + if Get_Name_Staticness (Object) < Globally then + Error_Msg_Sem ("actual must be a static name", Actual); + end if; + if Get_Kind (Prefix) = Iir_Kind_Interface_Signal_Declaration + then + declare + P : Boolean; + pragma Unreferenced (P); + begin + P := Check_Port_Association_Restriction + (Formal_Base, Prefix, El); + end; + end if; + when others => + -- Expression. + Set_Collapse_Signal_Flag (El, False); + + -- If there is an IN conversion, re-integrate it into + -- the actual. + declare + In_Conv : Iir; + begin + In_Conv := Get_In_Conversion (El); + if In_Conv /= Null_Iir then + Set_In_Conversion (El, Null_Iir); + Set_Expr_Staticness + (In_Conv, Get_Expr_Staticness (Actual)); + Actual := In_Conv; + Set_Actual (El, Actual); + end if; + end; + if Flags.Vhdl_Std >= Vhdl_93c then + -- LRM93 1.1.1.2 Ports + -- Moreover, the ports of a block may be associated + -- with an expression, in order to provide these ports + -- with constant driving values; such ports must be + -- of mode in. + if Get_Mode (Formal_Base) /= Iir_In_Mode then + Error_Msg_Sem ("only 'in' ports may be associated " + & "with expression", El); + end if; + + -- LRM93 1.1.1.2 Ports + -- The actual, if an expression, must be a globally + -- static expression. + if Get_Expr_Staticness (Actual) < Globally then + Error_Msg_Sem + ("actual expression must be globally static", + Actual); + end if; + else + Error_Msg_Sem + ("cannot associate ports with expression in vhdl87", + El); + end if; + end case; + end if; + El := Get_Chain (El); + end loop; + end Sem_Port_Association_Chain; + + -- INTER_PARENT contains generics and ports interfaces; + -- ASSOC_PARENT constains generics and ports map aspects. + procedure Sem_Generic_Port_Association_Chain + (Inter_Parent : Iir; Assoc_Parent : Iir) + is + Res : Boolean; + pragma Unreferenced (Res); + begin + Sem_Generic_Association_Chain (Inter_Parent, Assoc_Parent); + Sem_Port_Association_Chain (Inter_Parent, Assoc_Parent); + end Sem_Generic_Port_Association_Chain; + + -- LRM 1.3 Configuration Declarations. + procedure Sem_Configuration_Declaration (Decl: Iir) + is + Entity: Iir_Entity_Declaration; + Entity_Unit : Iir_Design_Unit; + begin + Xref_Decl (Decl); + + -- LRM 1.3 + -- The entity name identifies the name of the entity declaration that + -- defines the design entity at the apex of the design hierarchy. + Entity := Sem_Entity_Name (Decl); + if Entity = Null_Iir then + return; + end if; + Entity_Unit := Get_Design_Unit (Entity); + + -- LRM 11.4 + -- A primary unit whose name is referenced within a given design unit + -- must be analyzed prior to the analysis of the given design unit. + Add_Dependence (Entity_Unit); + + Sem_Scopes.Add_Name (Decl); + + Set_Visible_Flag (Decl, True); + + -- LRM 10.1 Declarative Region + -- 2. A configuration declaration. + Open_Declarative_Region; + + -- LRM93 10.2 + -- In addition to the above rules, the scope of any declaration that + -- includes the end of the declarative part of a given block (wether + -- it be an external block defined by a design entity or an internal + -- block defined by a block statement) extends into a configuration + -- declaration that configures the given block. + Add_Context_Clauses (Entity_Unit); + Sem_Scopes.Add_Entity_Declarations (Entity); + + Sem_Declaration_Chain (Decl); + -- GHDL: no need to check for missing subprogram bodies, since they are + -- not allowed in configuration declarations. + + Sem_Block_Configuration (Get_Block_Configuration (Decl), Decl); + Close_Declarative_Region; + end Sem_Configuration_Declaration; + + -- LRM 1.3.1 Block Configuration. + -- FATHER is the block_configuration, configuration_declaration, + -- component_configuration containing the block_configuration BLOCK_CONF. + procedure Sem_Block_Configuration + (Block_Conf : Iir_Block_Configuration; Father: Iir) + is + El : Iir; + Block : Iir; + begin + case Get_Kind (Father) is + when Iir_Kind_Configuration_Declaration => + -- LRM93 1.3.1 + -- If a block configuration appears immediately within a + -- configuration declaration, then the block specification of that + -- block configuration must be an architecture name, and that + -- architecture name must denote a design entity body whose + -- interface is defined by the entity declaration denoted by the + -- entity name of the enclosing configuration declaration. + declare + Block_Spec : Iir; + Arch : Iir_Architecture_Body; + Design: Iir_Design_Unit; + begin + Block_Spec := Get_Block_Specification (Block_Conf); + -- FIXME: handle selected name. + if Get_Kind (Block_Spec) /= Iir_Kind_Simple_Name then + Error_Msg_Sem ("architecture name expected", Block_Spec); + return; + end if; + -- LRM 10.3 rule b) + -- For an architecture body associated with a given entity + -- declaration: at the place of the block specification in a + -- block configuration for an external block whose interface + -- is defined by that entity declaration. + Design := Libraries.Load_Secondary_Unit + (Get_Design_Unit (Get_Entity (Father)), + Get_Identifier (Block_Spec), + Block_Conf); + if Design = Null_Iir then + Error_Msg_Sem + ("no architecture '" & Image_Identifier (Block_Spec) & "'", + Block_Conf); + return; + end if; + Arch := Get_Library_Unit (Design); + Xref_Ref (Block_Spec, Arch); + Free_Iir (Block_Spec); + Set_Block_Specification (Block_Conf, Arch); + Block := Arch; + Add_Dependence (Design); + end; + + when Iir_Kind_Component_Configuration => + -- LRM93 1.3.1 + -- If a block configuration appears immediately within a component + -- configuration, then the corresponding components must be + -- fully bound, the block specification of that block + -- configuration must be an architecture name, and that + -- architecture name must denote the same architecture body as + -- that to which the corresponding components are bound. + declare + Block_Spec : Iir; + Arch : Iir_Architecture_Body; + Design: Iir_Design_Unit; + Entity_Aspect : Iir; + Comp_Arch : Iir; + begin + Entity_Aspect := + Get_Entity_Aspect (Get_Binding_Indication (Father)); + if Entity_Aspect = Null_Iir or else + Get_Kind (Entity_Aspect) /= Iir_Kind_Entity_Aspect_Entity + then + Error_Msg_Sem ("corresponding component not fully bound", + Block_Conf); + end if; + + Block_Spec := Get_Block_Specification (Block_Conf); + -- FIXME: handle selected name. + if Get_Kind (Block_Spec) /= Iir_Kind_Simple_Name then + Error_Msg_Sem ("architecture name expected", Block_Spec); + return; + end if; + + Comp_Arch := Get_Architecture (Entity_Aspect); + if Comp_Arch /= Null_Iir then + if Get_Kind (Comp_Arch) /= Iir_Kind_Simple_Name then + raise Internal_Error; + end if; + if Get_Identifier (Comp_Arch) /= Get_Identifier (Block_Spec) + then + Error_Msg_Sem + ("block specification name is different from " + & "component architecture name", Block_Spec); + return; + end if; + end if; + + Design := Libraries.Load_Secondary_Unit + (Get_Design_Unit (Get_Entity (Entity_Aspect)), + Get_Identifier (Block_Spec), + Block_Conf); + if Design = Null_Iir then + Error_Msg_Sem + ("no architecture '" & Image_Identifier (Block_Spec) & "'", + Block_Conf); + return; + end if; + Arch := Get_Library_Unit (Design); + Xref_Ref (Block_Spec, Arch); + Free_Iir (Block_Spec); + Set_Block_Specification (Block_Conf, Arch); + Block := Arch; + end; + + when Iir_Kind_Block_Configuration => + -- LRM93 1.3.1 + -- If a block configuration appears immediately within another + -- block configuration, then the block specification of the + -- contained block configuration must be a block statement or + -- generate statement label, and the label must denote a block + -- statement or generate statement that is contained immediatly + -- within the block denoted by the block specification of the + -- containing block configuration. + declare + Block_Spec : Iir; + Block_Name : Iir; + Block_Stmts : Iir; + Block_Spec_Kind : Iir_Kind; + Prev : Iir_Block_Configuration; + begin + Block_Spec := Get_Block_Specification (Block_Conf); + -- Remember the kind of BLOCK_SPEC, since the node can be free + -- by find_declaration if it is a simple name. + Block_Spec_Kind := Get_Kind (Block_Spec); + case Block_Spec_Kind is + when Iir_Kind_Simple_Name => + Block_Name := Block_Spec; + when Iir_Kind_Parenthesis_Name => + Block_Name := Get_Prefix (Block_Spec); + when Iir_Kind_Slice_Name => + Block_Name := Get_Prefix (Block_Spec); + when others => + Error_Msg_Sem ("label expected", Block_Spec); + return; + end case; + Block_Name := Sem_Denoting_Name (Block_Name); + Block := Get_Named_Entity (Block_Name); + case Get_Kind (Block) is + when Iir_Kind_Block_Statement => + if Block_Spec_Kind /= Iir_Kind_Simple_Name then + Error_Msg_Sem + ("label does not denote a generate statement", + Block_Spec); + end if; + Prev := Get_Block_Block_Configuration (Block); + if Prev /= Null_Iir then + Error_Msg_Sem + (Disp_Node (Block) & " was already configured at " + & Disp_Location (Prev), + Block_Conf); + return; + end if; + Set_Block_Block_Configuration (Block, Block_Conf); + when Iir_Kind_Generate_Statement => + if Block_Spec_Kind /= Iir_Kind_Simple_Name + and then Get_Kind (Get_Generation_Scheme (Block)) + /= Iir_Kind_Iterator_Declaration + then + -- LRM93 1.3 + -- If the block specification of a block configuration + -- contains a generate statement label, and if this + -- label contains an index specification, then it is + -- an error if the generate statement denoted by the + -- label does not have a generation scheme including + -- the reserved word for. + Error_Msg_Sem ("generate statement does not has a for", + Block_Spec); + return; + end if; + Set_Prev_Block_Configuration + (Block_Conf, Get_Generate_Block_Configuration (Block)); + Set_Generate_Block_Configuration (Block, Block_Conf); + when others => + Error_Msg_Sem ("block statement label expected", + Block_Conf); + return; + end case; + Block_Stmts := Get_Concurrent_Statement_Chain + (Get_Block_From_Block_Specification + (Get_Block_Specification (Father))); + if not Is_In_Chain (Block_Stmts, Block) then + Error_Msg_Sem + ("label does not denotes an inner block statement", + Block_Conf); + return; + end if; + + if Block_Spec_Kind = Iir_Kind_Parenthesis_Name then + Block_Spec := Sem_Index_Specification + (Block_Spec, Get_Type (Get_Generation_Scheme (Block))); + if Block_Spec /= Null_Iir then + Set_Prefix (Block_Spec, Block_Name); + Set_Block_Specification (Block_Conf, Block_Spec); + Block_Spec_Kind := Get_Kind (Block_Spec); + end if; + end if; + + case Block_Spec_Kind is + when Iir_Kind_Simple_Name => + Set_Block_Specification (Block_Conf, Block_Name); + when Iir_Kind_Indexed_Name + | Iir_Kind_Slice_Name => + null; + when Iir_Kind_Parenthesis_Name => + null; + when others => + raise Internal_Error; + end case; + end; + + when others => + Error_Kind ("sem_block_configuration", Father); + end case; + + -- LRM93 §10.1 + -- 10. A block configuration + Sem_Scopes.Open_Scope_Extension; + + -- LRM 10.3 + -- In addition, any declaration that is directly visible at the end of + -- the declarative part of a given block is directly visible in a block + -- configuration that configure the given block. This rule holds unless + -- a use clause that makes a homograph of the declaration potentially + -- visible (see 10.4) appears in the corresponding configuration + -- declaration, and if the scope of that use clause encompasses all or + -- part of those configuration items. If such a use clase appears, then + -- the declaration will be directly visible within the corresponding + -- configuration items, except at hose places that fall within the scope + -- of the additional use clause. At such places, neither name will be + -- directly visible. + -- FIXME: handle use clauses. + Sem_Scopes.Extend_Scope_Of_Block_Declarations (Block); + + declare + El : Iir; + begin + El := Get_Declaration_Chain (Block_Conf); + while El /= Null_Iir loop + case Get_Kind (El) is + when Iir_Kind_Use_Clause => + Sem_Use_Clause (El); + when others => + -- Parse checks there are only use clauses. + raise Internal_Error; + end case; + El := Get_Chain (El); + end loop; + end; + + -- VHDL 87: do not remove configuration specification in generate stmts. + Clear_Instantiation_Configuration (Block, False); + + El := Get_Configuration_Item_Chain (Block_Conf); + while El /= Null_Iir loop + case Get_Kind (El) is + when Iir_Kind_Block_Configuration => + Sem_Block_Configuration (El, Block_Conf); + when Iir_Kind_Component_Configuration => + Sem_Component_Configuration (El, Block_Conf); + when others => + Error_Kind ("sem_block_configuration(2)", El); + end case; + El := Get_Chain (El); + end loop; + Sem_Scopes.Close_Scope_Extension; + end Sem_Block_Configuration; + + -- LRM 1.3.2 + procedure Sem_Component_Configuration + (Conf : Iir_Component_Configuration; Father : Iir) + is + Block : Iir; + Configured_Block : Iir; + Binding : Iir; + Entity : Iir_Design_Unit; + Comp : Iir_Component_Declaration; + Primary_Entity_Aspect : Iir; + begin + -- LRM 10.1 Declarative Region + -- 11. A component configuration. + Open_Declarative_Region; + + -- LRM93 §10.2 + -- If a component configuration appears as a configuration item + -- immediatly within a block configuration that configures a given + -- block, and the scope of a given declaration includes the end of the + -- declarative part of that block, then the scope of the given + -- declaration extends from the beginning to the end of the + -- declarative region associated with the given component configuration. + -- GHDL: this is for labels of component instantiation statements, and + -- for local ports and generics of the component. + if Get_Kind (Father) = Iir_Kind_Block_Configuration then + Configured_Block := Get_Block_Specification (Father); + if Get_Kind (Configured_Block) = Iir_Kind_Design_Unit then + raise Internal_Error; + end if; + Configured_Block := + Get_Block_From_Block_Specification (Configured_Block); + Sem_Scopes.Extend_Scope_Of_Block_Declarations (Configured_Block); + else + -- Can a component configuration not be just inside a block + -- configuration ? + raise Internal_Error; + end if; + -- FIXME: this is wrong (all declarations should be considered). + Sem_Component_Specification + (Configured_Block, Conf, Primary_Entity_Aspect); + + Comp := Get_Named_Entity (Get_Component_Name (Conf)); + if Get_Kind (Comp) /= Iir_Kind_Component_Declaration then + -- There has been an error in sem_component_specification. + -- Leave here. + Close_Declarative_Region; + return; + end if; + + -- FIXME: (todo) + -- If a given component instance is unbound in the corresponding block, + -- then any explicit component configuration for that instance that does + -- not contain an explicit binding indication will contain an implicit, + -- default binding indication (see 5.2.2). Similarly, if a given + -- component instance is unbound in the corresponding block, then any + -- implicit component configuration for that instance will contain an + -- implicit, default binding indication. + Open_Declarative_Region; + Sem_Scopes.Add_Component_Declarations (Comp); + Binding := Get_Binding_Indication (Conf); + if Binding /= Null_Iir then + Sem_Binding_Indication (Binding, Comp, Conf, Primary_Entity_Aspect); + + if Primary_Entity_Aspect /= Null_Iir then + -- LRM93 5.2.1 Binding Indication + -- It is an error if a formal port appears in the port map aspect + -- of the incremental binding indication and it is a formal + -- port that is associated with an actual other than OPEN in one + -- of the primary binding indications. + declare + Inst : Iir; + Primary_Binding : Iir; + F_Chain : Iir; + F_El, S_El : Iir; + Formal : Iir; + begin + Inst := Get_Concurrent_Statement_Chain (Configured_Block); + while Inst /= Null_Iir loop + if Get_Kind (Inst) + = Iir_Kind_Component_Instantiation_Statement + and then Get_Component_Configuration (Inst) = Conf + then + -- Check here. + Primary_Binding := Get_Binding_Indication + (Get_Configuration_Specification (Inst)); + F_Chain := Get_Port_Map_Aspect_Chain (Primary_Binding); + S_El := Get_Port_Map_Aspect_Chain (Binding); + while S_El /= Null_Iir loop + -- Find S_EL formal in F_CHAIN. + Formal := Get_Association_Interface (S_El); + F_El := F_Chain; + while F_El /= Null_Iir loop + exit when Get_Association_Interface (F_El) = Formal; + F_El := Get_Chain (F_El); + end loop; + if F_El /= Null_Iir + and then Get_Kind (F_El) + /= Iir_Kind_Association_Element_Open + then + Error_Msg_Sem + (Disp_Node (Formal) + & " already associated in primary binding", + S_El); + end if; + S_El := Get_Chain (S_El); + end loop; + end if; + Inst := Get_Chain (Inst); + end loop; + end; + end if; + elsif Primary_Entity_Aspect = Null_Iir then + -- LRM93 5.2.1 + -- If the generic map aspect or port map aspect of a primary binding + -- indication is not present, then the default rules as described + -- in 5.2.2 apply. + + -- Create a default binding indication. + Entity := Get_Visible_Entity_Declaration (Comp); + Binding := Sem_Create_Default_Binding_Indication + (Comp, Entity, Conf, False); + + if Binding /= Null_Iir then + -- Remap to defaults. + Set_Default_Entity_Aspect (Binding, Get_Entity_Aspect (Binding)); + Set_Entity_Aspect (Binding, Null_Iir); + + Set_Default_Generic_Map_Aspect_Chain + (Binding, Get_Generic_Map_Aspect_Chain (Binding)); + Set_Generic_Map_Aspect_Chain (Binding, Null_Iir); + + Set_Default_Port_Map_Aspect_Chain + (Binding, Get_Port_Map_Aspect_Chain (Binding)); + Set_Port_Map_Aspect_Chain (Binding, Null_Iir); + + Set_Binding_Indication (Conf, Binding); + end if; + end if; + Close_Declarative_Region; + + -- External block. + Block := Get_Block_Configuration (Conf); + if Block /= Null_Iir and then Binding /= Null_Iir then + Sem_Block_Configuration (Block, Conf); + end if; + Close_Declarative_Region; + end Sem_Component_Configuration; + + function Are_Trees_Chain_Equal (Left, Right : Iir) return Boolean + is + El_Left, El_Right : Iir; + begin + if Left = Right then + return True; + end if; + El_Left := Left; + El_Right := Right; + loop + if El_Left = Null_Iir and El_Right = Null_Iir then + return True; + end if; + if El_Left = Null_Iir or El_Right = Null_Iir then + return False; + end if; + if not Are_Trees_Equal (El_Left, El_Right) then + return False; + end if; + El_Left := Get_Chain (El_Left); + El_Right := Get_Chain (El_Right); + end loop; + end Are_Trees_Chain_Equal; + + -- Return TRUE iff LEFT and RIGHT are (in depth) equal. + -- This corresponds to conformance rules, LRM93 2.7 + function Are_Trees_Equal (Left, Right : Iir) return Boolean + is + El_Left, El_Right : Iir; + begin + -- Short-cut to speed up. + if Left = Right then + return True; + end if; + + -- Handle null_iir. + if Left = Null_Iir or Right = Null_Iir then + -- Note: LEFT *xor* RIGHT is null_iir. + return False; + end if; + + -- LRM 2.7 Conformance Rules + -- A simple name can be replaced by an expanded name in which this + -- simple name is the selector, if and only if at both places the + -- meaning of the simple name is given by the same declaration. + case Get_Kind (Left) is + when Iir_Kind_Simple_Name + | Iir_Kind_Selected_Name => + case Get_Kind (Right) is + when Iir_Kind_Simple_Name + | Iir_Kind_Selected_Name => + return Are_Trees_Equal (Get_Named_Entity (Left), + Get_Named_Entity (Right)); + when others => + return False; + end case; + when others => + null; + end case; + + -- If nodes are not of the same kind, then they are not equals! + if Get_Kind (Left) /= Get_Kind (Right) then + return False; + end if; + + case Get_Kind (Left) is + when Iir_Kinds_Procedure_Declaration => + return Are_Trees_Chain_Equal + (Get_Interface_Declaration_Chain (Left), + Get_Interface_Declaration_Chain (Right)); + when Iir_Kinds_Function_Declaration => + if not Are_Trees_Equal (Get_Return_Type (Left), + Get_Return_Type (Right)) + then + return False; + end if; + if Get_Pure_Flag (Left) /= Get_Pure_Flag (Right) then + return False; + end if; + if not Are_Trees_Chain_Equal + (Get_Interface_Declaration_Chain (Left), + Get_Interface_Declaration_Chain (Right)) + then + return False; + end if; + return True; + when Iir_Kind_Interface_Constant_Declaration + | Iir_Kind_Interface_Variable_Declaration + | Iir_Kind_Interface_Signal_Declaration + | Iir_Kind_Interface_File_Declaration => + if Get_Identifier (Left) /= Get_Identifier (Right) then + return False; + end if; + if Get_Lexical_Layout (Left) /= Get_Lexical_Layout (Right) + or else Get_Mode (Left) /= Get_Mode (Right) + then + return False; + end if; + if not Are_Trees_Equal (Get_Type (Left), Get_Type (Right)) then + return False; + end if; + El_Left := Get_Default_Value (Left); + El_Right := Get_Default_Value (Right); + if (El_Left = Null_Iir) xor (El_Right = Null_Iir) then + return False; + end if; + if El_Left /= Null_Iir + and then Are_Trees_Equal (El_Left, El_Right) = False + then + return False; + end if; + return True; + + when Iir_Kind_Integer_Subtype_Definition + | Iir_Kind_Enumeration_Subtype_Definition + | Iir_Kind_Floating_Subtype_Definition + | Iir_Kind_Physical_Subtype_Definition => + if Get_Base_Type (Left) /= Get_Base_Type (Right) then + return False; + end if; + if Get_Type_Declarator (Left) /= Get_Type_Declarator (Right) then + return False; + end if; + if not Are_Trees_Equal (Get_Resolution_Indication (Left), + Get_Resolution_Indication (Right)) + then + return False; + end if; + if Are_Trees_Equal (Get_Range_Constraint (Left), + Get_Range_Constraint (Right)) = False + then + return False; + end if; + return True; + when Iir_Kind_Array_Subtype_Definition => + if Get_Base_Type (Left) /= Get_Base_Type (Right) then + return False; + end if; + if not Are_Trees_Equal (Get_Resolution_Indication (Left), + Get_Resolution_Indication (Right)) + then + return False; + end if; + declare + L_Left, L_Right : Iir_List; + begin + L_Left := Get_Index_Subtype_List (Left); + L_Right := Get_Index_Subtype_List (Right); + for I in Natural loop + El_Left := Get_Nth_Element (L_Left, I); + El_Right := Get_Nth_Element (L_Right, I); + exit when El_Left = Null_Iir; + if not Are_Trees_Equal (El_Left, El_Right) then + return False; + end if; + end loop; + end; + return True; + when Iir_Kind_Record_Subtype_Definition => + if Get_Base_Type (Left) /= Get_Base_Type (Right) then + return False; + end if; + if not Are_Trees_Equal (Get_Resolution_Indication (Left), + Get_Resolution_Indication (Right)) + then + return False; + end if; + declare + L_Left, L_Right : Iir_List; + begin + L_Left := Get_Elements_Declaration_List (Left); + L_Right := Get_Elements_Declaration_List (Right); + for I in Natural loop + El_Left := Get_Nth_Element (L_Left, I); + El_Right := Get_Nth_Element (L_Right, I); + exit when El_Left = Null_Iir; + if not Are_Trees_Equal (El_Left, El_Right) then + return False; + end if; + end loop; + end; + return True; + + when Iir_Kind_Integer_Literal => + if Get_Value (Left) /= Get_Value (Right) then + return False; + end if; + return Are_Trees_Equal (Get_Literal_Origin (Left), + Get_Literal_Origin (Right)); + when Iir_Kind_Enumeration_Literal => + if Get_Enum_Pos (Left) /= Get_Enum_Pos (Right) then + return False; + end if; + return Are_Trees_Equal (Get_Literal_Origin (Left), + Get_Literal_Origin (Right)); + when Iir_Kind_Physical_Int_Literal => + if Get_Value (Left) /= Get_Value (Right) + or else not Are_Trees_Equal (Get_Unit_Name (Left), + Get_Unit_Name (Right)) + then + return False; + end if; + return Are_Trees_Equal (Get_Literal_Origin (Left), + Get_Literal_Origin (Right)); + when Iir_Kind_Physical_Fp_Literal => + if Get_Fp_Value (Left) /= Get_Fp_Value (Right) + or else Get_Unit_Name (Left) /= Get_Unit_Name (Right) + then + return False; + end if; + return Are_Trees_Equal (Get_Literal_Origin (Left), + Get_Literal_Origin (Right)); + when Iir_Kind_Floating_Point_Literal => + if Get_Fp_Value (Left) /= Get_Fp_Value (Right) then + return False; + end if; + return Are_Trees_Equal (Get_Literal_Origin (Left), + Get_Literal_Origin (Right)); + + when Iir_Kinds_Dyadic_Operator => + return Are_Trees_Equal (Get_Left (Left), Get_Left (Right)) + and then Are_Trees_Equal (Get_Right (Left), Get_Right (Right)); + when Iir_Kinds_Monadic_Operator => + return Are_Trees_Equal (Get_Operand (Left), Get_Operand (Right)); + + when Iir_Kind_Access_Type_Definition + | Iir_Kind_Record_Type_Definition + | Iir_Kind_Array_Type_Definition + | Iir_Kind_Enumeration_Type_Definition + | Iir_Kind_File_Type_Definition => + return Left = Right; + + when Iir_Kind_Range_Expression => + if Get_Type (Left) /= Get_Type (Right) + or else Get_Direction (Left) /= Get_Direction (Right) + then + return False; + end if; + if not Are_Trees_Equal (Get_Left_Limit (Left), + Get_Left_Limit (Right)) + or else not Are_Trees_Equal (Get_Right_Limit (Left), + Get_Right_Limit (Right)) + then + return False; + end if; + return True; + + when Iir_Kind_High_Type_Attribute + | Iir_Kind_Low_Type_Attribute + | Iir_Kind_Left_Type_Attribute + | Iir_Kind_Right_Type_Attribute + | Iir_Kind_Ascending_Type_Attribute => + return Are_Trees_Equal (Get_Prefix (Left), Get_Prefix (Right)); + + when Iir_Kind_String_Literal + | Iir_Kind_Bit_String_Literal => + if Get_Kind (Left) = Iir_Kind_Bit_String_Literal + and then Get_Bit_String_Base (Left) + /= Get_Bit_String_Base (Right) + then + return False; + end if; + declare + use Str_Table; + Len : Nat32; + L_Ptr : String_Fat_Acc; + R_Ptr : String_Fat_Acc; + begin + Len := Get_String_Length (Left); + if Get_String_Length (Right) /= Len then + return False; + end if; + L_Ptr := Get_String_Fat_Acc (Get_String_Id (Left)); + R_Ptr := Get_String_Fat_Acc (Get_String_Id (Right)); + for I in 1 .. Len loop + if L_Ptr (I) /= R_Ptr (I) then + return False; + end if; + end loop; + return True; + end; + + when Iir_Kind_Aggregate => + if not Are_Trees_Equal (Get_Type (Left), Get_Type (Right)) then + return False; + end if; + declare + El_L, El_R : Iir; + begin + El_L := Get_Association_Choices_Chain (Left); + El_R := Get_Association_Choices_Chain (Right); + loop + exit when El_L = Null_Iir and El_R = Null_Iir; + if not Are_Trees_Equal (El_L, El_R) then + return False; + end if; + El_L := Get_Chain (El_L); + El_R := Get_Chain (El_R); + end loop; + return True; + end; + + when Iir_Kind_Choice_By_None + | Iir_Kind_Choice_By_Others => + return Are_Trees_Equal (Get_Associated_Expr (Left), + Get_Associated_Expr (Right)); + when Iir_Kind_Choice_By_Name => + if not Are_Trees_Equal (Get_Choice_Name (Left), + Get_Choice_Name (Right)) + then + return False; + end if; + return Are_Trees_Equal (Get_Associated_Expr (Left), + Get_Associated_Expr (Right)); + when Iir_Kind_Choice_By_Expression => + if not Are_Trees_Equal (Get_Choice_Expression (Left), + Get_Choice_Expression (Right)) then + return False; + end if; + return Are_Trees_Equal (Get_Associated_Expr (Left), + Get_Associated_Expr (Right)); + when Iir_Kind_Choice_By_Range => + if not Are_Trees_Equal (Get_Choice_Range (Left), + Get_Choice_Range (Right)) then + return False; + end if; + return Are_Trees_Equal (Get_Associated_Expr (Left), + Get_Associated_Expr (Right)); + when Iir_Kind_Character_Literal => + return Are_Trees_Equal (Get_Named_Entity (Left), + Get_Named_Entity (Right)); + when others => + Error_Kind ("are_trees_equal", Left); + end case; + end Are_Trees_Equal; + + -- LRM 2.7 Conformance Rules. + procedure Check_Conformance_Rules (Subprg, Spec: Iir) is + begin + if not Are_Trees_Equal (Subprg, Spec) then + -- FIXME: should explain why it does not conform ? + Error_Msg_Sem ("body of " & Disp_Node (Subprg) + & " does not conform with specification at " + & Disp_Location (Spec), Subprg); + end if; + end Check_Conformance_Rules; + + -- Return the specification corresponding to a declaration DECL, or + -- null_Iir if none. + -- FIXME: respect rules of LRM93 2.7 + function Find_Subprogram_Specification (Decl: Iir) return Iir + is + Interpretation : Name_Interpretation_Type; + Decl1: Iir; + Hash : Iir_Int32; + Kind : Iir_Kind; + begin + Hash := Get_Subprogram_Hash (Decl); + Interpretation := Get_Interpretation (Get_Identifier (Decl)); + while Valid_Interpretation (Interpretation) loop + if not Is_In_Current_Declarative_Region (Interpretation) then + -- The declaration does not belong to the current declarative + -- region, neither will the following one. So, we do not found + -- it. + return Null_Iir; + end if; + Decl1 := Get_Declaration (Interpretation); + Kind := Get_Kind (Decl1); + -- Should be sure DECL1 and DECL belongs to the same declarative + -- region, ie DECL1 was not made visible via a USE clause. + -- + -- Also, only check for explicitly subprograms (and not + -- implicit one). + if (Kind = Iir_Kind_Function_Declaration + or Kind = Iir_Kind_Procedure_Declaration) + and then not Is_Potentially_Visible (Interpretation) + and then Get_Subprogram_Hash (Decl1) = Hash + and then Is_Same_Profile (Decl, Decl1) + then + return Decl1; + end if; + Interpretation := Get_Next_Interpretation (Interpretation); + end loop; + return Null_Iir; + end Find_Subprogram_Specification; + + procedure Set_Subprogram_Overload_Number (Decl : Iir) + is + Id : constant Name_Id := Get_Identifier (Decl); + Inter : Name_Interpretation_Type; + Prev : Iir; + Num : Iir_Int32; + begin + Inter := Get_Interpretation (Id); + while Valid_Interpretation (Inter) + and then Is_In_Current_Declarative_Region (Inter) + loop + -- There is a previous declaration with the same name in the + -- current declarative region. + Prev := Get_Declaration (Inter); + case Get_Kind (Prev) is + when Iir_Kind_Function_Declaration + | Iir_Kind_Procedure_Declaration => + -- The previous declaration is a user subprogram. + Num := Get_Overload_Number (Prev) + 1; + if Num = 1 + and then Get_Parent (Prev) = Get_Parent (Decl) + then + -- The previous was not (yet) overloaded. Mark it as + -- overloaded. + -- Do not mark it if it is not in the same declarative part. + -- (ie, do not change a subprogram declaration in the + -- package while analyzing the body). + Set_Overload_Number (Prev, 1); + Num := 2; + end if; + Set_Overload_Number (Decl, Num); + return; + when Iir_Kind_Implicit_Function_Declaration + | Iir_Kind_Implicit_Procedure_Declaration => + -- Implicit declarations aren't taken into account (as they + -- are mangled differently). + Inter := Get_Next_Interpretation (Inter); + when Iir_Kind_Enumeration_Literal => + -- Enumeration literal are ignored for overload number. + Inter := Get_Next_Interpretation (Inter); + when others => + -- An error ? + Set_Overload_Number (Decl, 0); + return; + end case; + end loop; + -- No previous declaration in the current declarative region. + Set_Overload_Number (Decl, 0); + end Set_Subprogram_Overload_Number; + + -- Check requirements on number of interfaces for subprogram specification + -- SUBPRG. Requirements only concern operators, and are defined in + -- LRM 2.3.1 + procedure Check_Operator_Requirements (Id : Name_Id; Subprg : Iir) + is + use Std_Names; + + Nbr_Interfaces : Natural; + Is_Method : Boolean; + begin + Nbr_Interfaces := Iir_Chains.Get_Chain_Length + (Get_Interface_Declaration_Chain (Subprg)); + + -- For vhdl-02, the protected variable is an implicit parameter. + if Flags.Vhdl_Std >= Vhdl_02 + and then Is_Subprogram_Method (Subprg) + then + Nbr_Interfaces := Nbr_Interfaces + 1; + else + Is_Method := False; + end if; + + case Id is + when Name_Abs + | Name_Not => + -- LRM93 2.3.1 + -- The subprogram specification of a unary operator must have a + -- single parameter. + + -- LRM02 2.3.1 + -- ..., unless the subprogram specification is a method (see + -- 3.5.1) of a protected type. In this latter case, the + -- subprogram specification must have no parameters. + if Nbr_Interfaces = 1 then + return; + end if; + Error_Msg_Sem ("unary operator must have a single parameter", + Subprg); + when Name_Mod + | Name_Rem + | Name_Op_Mul + | Name_Op_Div + | Name_Relational_Operators + | Name_Op_Concatenation + | Name_Shift_Operators + | Name_Op_Exp => + -- LRM93 2.3.1 + -- The subprogram specification of a binary operator must have + -- two parameters. + + -- LRM02 2.3.1 + -- ..., unless the subprogram specification is a method of a + -- protected type, in which case, the subprogram specification + -- must have a single parameter. + if Nbr_Interfaces = 2 then + return; + end if; + Error_Msg_Sem + ("binary operators must have two parameters", Subprg); + when Name_Logical_Operators + | Name_Xnor => + -- LRM08 4.5.2 Operator overloading + -- For each of the "+", "-", "and", "or", "xor", "nand", "nor" + -- and "xnor", overloading is allowed both as a unary operator + -- and as a binary operator. + if Nbr_Interfaces = 2 then + return; + end if; + if Nbr_Interfaces = 1 then + if Vhdl_Std >= Vhdl_08 then + return; + end if; + Error_Msg_Sem + ("logical operators must have two parameters before vhdl08", + Subprg); + else + Error_Msg_Sem + ("logical operators must have two parameters", Subprg); + end if; + when Name_Op_Plus + | Name_Op_Minus => + -- LRM93 2.3.1 + -- For each of the operators "+" and "-", overloading is allowed + -- both as a unary operator and as a binary operator. + if Nbr_Interfaces in 1 .. 2 then + return; + end if; + Error_Msg_Sem + ("""+"" and ""-"" operators must have 1 or 2 parameters", + Subprg); + when others => + return; + end case; + if Is_Method then + Error_Msg_Sem + (" (the protected object is an implicit parameter of methods)", + Subprg); + end if; + end Check_Operator_Requirements; + + procedure Compute_Subprogram_Hash (Subprg : Iir) + is + type Hash_Type is mod 2**32; + function To_Hash is new Ada.Unchecked_Conversion + (Source => Iir, Target => Hash_Type); + function To_Int32 is new Ada.Unchecked_Conversion + (Source => Hash_Type, Target => Iir_Int32); + + Kind : Iir_Kind; + Hash : Hash_Type; + Sig : Hash_Type; + Inter : Iir; + Itype : Iir; + begin + Kind := Get_Kind (Subprg); + if Kind in Iir_Kinds_Function_Declaration + or else Kind = Iir_Kind_Enumeration_Literal + then + Itype := Get_Base_Type (Get_Return_Type (Subprg)); + Hash := To_Hash (Itype); + Sig := 8; + else + Sig := 1; + Hash := 0; + end if; + + if Kind /= Iir_Kind_Enumeration_Literal then + Inter := Get_Interface_Declaration_Chain (Subprg); + while Inter /= Null_Iir loop + Itype := Get_Base_Type (Get_Type (Inter)); + Sig := Sig + 1; + Hash := Hash * 7 + To_Hash (Itype); + Hash := Hash + Hash / 2**28; + Inter := Get_Chain (Inter); + end loop; + end if; + Set_Subprogram_Hash (Subprg, To_Int32 (Hash + Sig)); + end Compute_Subprogram_Hash; + + -- LRM 2.1 Subprogram Declarations. + procedure Sem_Subprogram_Declaration (Subprg: Iir) + is + Spec: Iir; + Interface_Chain : Iir; + Subprg_Body : Iir; + Return_Type : Iir; + begin + -- Set depth. + declare + Parent : constant Iir := Get_Parent (Subprg); + begin + case Get_Kind (Parent) is + when Iir_Kind_Function_Declaration + | Iir_Kind_Procedure_Declaration => + raise Internal_Error; + when Iir_Kind_Function_Body + | Iir_Kind_Procedure_Body => + Set_Subprogram_Depth + (Subprg, + Get_Subprogram_Depth + (Get_Subprogram_Specification (Parent)) + 1); + when others => + Set_Subprogram_Depth (Subprg, 0); + end case; + end; + + -- LRM 10.1 Declarative Region + -- 3. A subprogram declaration, together with the corresponding + -- subprogram body. + Open_Declarative_Region; + + -- Sem interfaces. + Interface_Chain := Get_Interface_Declaration_Chain (Subprg); + case Get_Kind (Subprg) is + when Iir_Kind_Function_Declaration => + Sem_Interface_Chain + (Interface_Chain, Function_Parameter_Interface_List); + Return_Type := Get_Return_Type_Mark (Subprg); + Return_Type := Sem_Type_Mark (Return_Type); + Set_Return_Type_Mark (Subprg, Return_Type); + Set_Return_Type (Subprg, Get_Type (Return_Type)); + Set_All_Sensitized_State (Subprg, Unknown); + when Iir_Kind_Procedure_Declaration => + Sem_Interface_Chain + (Interface_Chain, Procedure_Parameter_Interface_List); + -- Unless the body is analyzed, the procedure purity is unknown. + Set_Purity_State (Subprg, Unknown); + -- Check if the procedure is passive. + Set_Passive_Flag (Subprg, True); + Set_All_Sensitized_State (Subprg, Unknown); + declare + Inter : Iir; + begin + Inter := Interface_Chain; + while Inter /= Null_Iir loop + if Get_Kind (Inter) = Iir_Kind_Interface_Signal_Declaration + and then Get_Mode (Inter) /= Iir_In_Mode + then + -- There is a driver for this signal interface. + Set_Passive_Flag (Subprg, False); + exit; + end if; + Inter := Get_Chain (Inter); + end loop; + end; + when others => + Error_Kind ("sem_subprogram_declaration", Subprg); + end case; + + Check_Operator_Requirements (Get_Identifier (Subprg), Subprg); + + Compute_Subprogram_Hash (Subprg); + + -- The specification has been semantized, close the declarative region + -- now. + Close_Declarative_Region; + + -- Look if there is an associated body (the next node). + Subprg_Body := Get_Chain (Subprg); + if Subprg_Body /= Null_Iir + and then (Get_Kind (Subprg_Body) = Iir_Kind_Function_Body + or else Get_Kind (Subprg_Body) = Iir_Kind_Procedure_Body) + then + Spec := Find_Subprogram_Specification (Subprg); + else + Spec := Null_Iir; + end if; + + if Spec /= Null_Iir then + -- SUBPRG is the body of the specification SPEC. + Check_Conformance_Rules (Subprg, Spec); + Xref_Body (Subprg, Spec); + Set_Subprogram_Body (Subprg, Subprg_Body); + Set_Subprogram_Specification (Subprg_Body, Spec); + Set_Subprogram_Body (Spec, Subprg_Body); + else + -- Forward declaration or specification followed by body. + Set_Subprogram_Overload_Number (Subprg); + Sem_Scopes.Add_Name (Subprg); + Name_Visible (Subprg); + Xref_Decl (Subprg); + end if; + end Sem_Subprogram_Declaration; + + procedure Add_Analysis_Checks_List (El : Iir) + is + Design : constant Iir := Get_Current_Design_Unit; + List : Iir_List; + begin + List := Get_Analysis_Checks_List (Design); + if List = Null_Iir_List then + List := Create_Iir_List; + Set_Analysis_Checks_List (Design, List); + end if; + Add_Element (List, El); + end Add_Analysis_Checks_List; + + procedure Sem_Subprogram_Body (Subprg : Iir) + is + Spec : Iir; + El : Iir; + begin + Spec := Get_Subprogram_Specification (Subprg); + Set_Impure_Depth (Subprg, Iir_Depth_Pure); + + -- LRM 10.1 Declarative regions + -- 3. A subprogram declaration, together with the corresponding + -- subprogram body. + Open_Declarative_Region; + Set_Is_Within_Flag (Spec, True); + + -- Add the interface names into the current declarative region. + El := Get_Interface_Declaration_Chain (Spec); + while El /= Null_Iir loop + Add_Name (El, Get_Identifier (El), False); + if Get_Kind (El) = Iir_Kind_Interface_Signal_Declaration then + Set_Has_Active_Flag (El, False); + end if; + El := Get_Chain (El); + end loop; + + Sem_Sequential_Statements (Spec, Subprg); + + Set_Is_Within_Flag (Spec, False); + Close_Declarative_Region; + + case Get_Kind (Spec) is + when Iir_Kind_Procedure_Declaration => + -- Update purity state of procedure if there are no callees. + case Get_Purity_State (Spec) is + when Pure + | Maybe_Impure => + -- We can't know this yet. + raise Internal_Error; + when Impure => + null; + when Unknown => + if Get_Callees_List (Subprg) = Null_Iir_List then + -- Since there are no callees, purity state can + -- be updated. + if Get_Impure_Depth (Subprg) = Iir_Depth_Pure then + Set_Purity_State (Spec, Pure); + else + Set_Purity_State (Spec, Maybe_Impure); + end if; + end if; + end case; + + -- Update wait state if the state of all callees is known. + if Get_Wait_State (Spec) = Unknown then + declare + Callees : Iir_List; + Callee : Iir; + State : Tri_State_Type; + begin + Callees := Get_Callees_List (Subprg); + -- Per default, has no wait. + Set_Wait_State (Spec, False); + if Callees /= Null_Iir_List then + for I in Natural loop + Callee := Get_Nth_Element (Callees, I); + exit when Callee = Null_Iir; + case Get_Kind (Callee) is + when Iir_Kinds_Function_Declaration => + null; + when Iir_Kind_Procedure_Declaration => + State := Get_Wait_State (Callee); + case State is + when False => + null; + when Unknown => + -- Yet unknown, but can be TRUE. + Set_Wait_State (Spec, Unknown); + when True => + -- Can this happen ? + raise Internal_Error; + --Set_Wait_State (Spec, True); + --exit; + end case; + when Iir_Kind_Implicit_Procedure_Declaration => + null; + when others => + Error_Kind ("sem_subprogram_body(2)", Callee); + end case; + end loop; + end if; + end; + end if; + + -- Set All_Sensitized_State in trivial cases. + if Get_All_Sensitized_State (Spec) = Unknown + and then Get_Callees_List (Subprg) = Null_Iir_List + then + Set_All_Sensitized_State (Spec, No_Signal); + end if; + + -- Do not add to Analysis_Check_List as procedures can't + -- generate purity/wait/all-sensitized errors by themselves. + + when Iir_Kind_Function_Declaration => + if Get_Callees_List (Subprg) /= Null_Iir_List then + -- Purity calls to be checked later. + -- No wait statements in procedures called. + Add_Analysis_Checks_List (Spec); + end if; + when others => + Error_Kind ("sem_subprogram_body", Spec); + end case; + end Sem_Subprogram_Body; + + -- Status of Update_And_Check_Pure_Wait. + type Update_Pure_Status is + ( + -- The purity/wait/all-sensitized are computed and known. + Update_Pure_Done, + -- A missing body prevents from computing the purity/wait/all-sensitized + Update_Pure_Missing, + -- Purity/wait/all-sensitized is unknown (recursion). + Update_Pure_Unknown + ); + + function Update_And_Check_Pure_Wait (Subprg : Iir) return Update_Pure_Status + is + procedure Error_Wait (Caller : Iir; Callee : Iir) is + begin + Error_Msg_Sem + (Disp_Node (Caller) & " must not contain wait statement, but calls", + Caller); + Error_Msg_Sem + (Disp_Node (Callee) & " which has (indirectly) a wait statement", + Callee); + end Error_Wait; + + -- Kind of subprg. + type Caller_Kind is (K_Function, K_Process, K_Procedure); + Kind : Caller_Kind; + + Callees_List : Iir_List; + Callees_List_Holder : Iir; + Callee : Iir; + Callee_Orig : Iir; + Callee_Bod : Iir; + Subprg_Depth : Iir_Int32; + Subprg_Bod : Iir; + -- Current purity depth of SUBPRG. + Depth : Iir_Int32; + Depth_Callee : Iir_Int32; + Has_Wait_Errors : Boolean := False; + Npos : Natural; + Res, Res1 : Update_Pure_Status; + begin + case Get_Kind (Subprg) is + when Iir_Kind_Function_Declaration => + Kind := K_Function; + Subprg_Bod := Get_Subprogram_Body (Subprg); + Subprg_Depth := Get_Subprogram_Depth (Subprg); + Callees_List_Holder := Subprg_Bod; + if Get_Pure_Flag (Subprg) then + Depth := Iir_Depth_Pure; + else + Depth := Iir_Depth_Impure; + end if; + + when Iir_Kind_Procedure_Declaration => + Kind := K_Procedure; + Subprg_Bod := Get_Subprogram_Body (Subprg); + if Get_Purity_State (Subprg) = Impure + and then Get_Wait_State (Subprg) /= Unknown + and then Get_All_Sensitized_State (Subprg) /= Unknown + then + -- No need to go further. + if Get_All_Sensitized_State (Subprg) = No_Signal + or else Vhdl_Std < Vhdl_08 + then + Callees_List := Get_Callees_List (Subprg_Bod); + Destroy_Iir_List (Callees_List); + Set_Callees_List (Subprg_Bod, Null_Iir_List); + end if; + return Update_Pure_Done; + end if; + Subprg_Depth := Get_Subprogram_Depth (Subprg); + Depth := Get_Impure_Depth (Subprg_Bod); + Callees_List_Holder := Subprg_Bod; + + when Iir_Kind_Sensitized_Process_Statement => + Kind := K_Process; + Subprg_Bod := Null_Iir; + Subprg_Depth := Iir_Depth_Top; + Depth := Iir_Depth_Impure; + Callees_List_Holder := Subprg; + + when others => + Error_Kind ("update_and_check_pure_wait(1)", Subprg); + end case; + + -- If the subprogram has no callee list, there is nothing to do. + Callees_List := Get_Callees_List (Callees_List_Holder); + if Callees_List = Null_Iir_List then + -- There are two reasons why a callees_list is null: + -- * either because SUBPRG does not call any procedure + -- in this case, the status are already known and we should have + -- returned in the above case. + -- * or because of a recursion + -- in this case the status are still unknown here. + return Update_Pure_Unknown; + end if; + + -- By default we don't know the status. + Res := Update_Pure_Unknown; + + -- This subprogram is being considered. + -- To avoid infinite loop, suppress its callees list. + Set_Callees_List (Callees_List_Holder, Null_Iir_List); + + -- First loop: check without recursion. + -- Second loop: recurse if necessary. + for J in 0 .. 1 loop + Npos := 0; + for I in Natural loop + Callee := Get_Nth_Element (Callees_List, I); + exit when Callee = Null_Iir; + + -- Note: + -- Pure functions should not be in the list. + -- Impure functions must have directly set Purity_State. + + -- Check pure. + Callee_Bod := Get_Subprogram_Body (Callee); + + if Callee_Bod = Null_Iir then + -- The body of subprograms may not be set for instances. + -- Use the body from the generic (if any). + Callee_Orig := Sem_Inst.Get_Origin (Callee); + if Callee_Orig /= Null_Iir then + Callee_Bod := Get_Subprogram_Body (Callee_Orig); + Set_Subprogram_Body (Callee, Callee_Bod); + end if; + end if; + + if Callee_Bod = Null_Iir then + -- No body yet for the subprogram called. + -- Nothing can be extracted from it, postpone the checks until + -- elaboration. + Res := Update_Pure_Missing; + else + -- Second loop: recurse if a state is not known. + if J = 1 + and then + ((Get_Kind (Callee) = Iir_Kind_Procedure_Declaration + and then Get_Purity_State (Callee) = Unknown) + or else Get_Wait_State (Callee) = Unknown + or else Get_All_Sensitized_State (Callee) = Unknown) + then + Res1 := Update_And_Check_Pure_Wait (Callee); + if Res1 = Update_Pure_Missing then + Res := Update_Pure_Missing; + end if; + end if; + + -- Check purity only if the subprogram is not impure. + if Depth /= Iir_Depth_Impure then + Depth_Callee := Get_Impure_Depth (Callee_Bod); + + -- Check purity depth. + if Depth_Callee < Subprg_Depth then + -- The call is an impure call because it calls an outer + -- subprogram (or an impure subprogram). + -- FIXME: check the compare. + Depth_Callee := Iir_Depth_Impure; + if Kind = K_Function then + -- FIXME: report call location + Error_Pure (Subprg_Bod, Callee, Null_Iir); + end if; + end if; + + -- Update purity depth. + if Depth_Callee < Depth then + Depth := Depth_Callee; + if Kind = K_Procedure then + -- Update for recursivity. + Set_Impure_Depth (Subprg_Bod, Depth); + if Depth = Iir_Depth_Impure then + Set_Purity_State (Subprg, Impure); + end if; + end if; + end if; + end if; + end if; + + -- Check wait. + if Has_Wait_Errors = False + and then Get_Wait_State (Callee) = True + then + if Kind = K_Procedure then + Set_Wait_State (Subprg, True); + else + Error_Wait (Subprg, Callee); + Has_Wait_Errors := True; + end if; + end if; + + if Get_All_Sensitized_State (Callee) = Invalid_Signal then + case Kind is + when K_Function | K_Procedure => + Set_All_Sensitized_State (Subprg, Invalid_Signal); + when K_Process => + -- LRM08 11.3 + -- + -- It is an error if a process statement with the + -- reserved word ALL as its process sensitivity list + -- is the parent of a subprogram declared in a design + -- unit other than that containing the process statement + -- and the subprogram reads an explicitly declared + -- signal that is not a formal signal parameter or + -- member of a formal signal parameter of the + -- subprogram or of any of its parents. Similarly, + -- it is an error if such subprogram reads an implicit + -- signal whose explicit ancestor is not a formal signal + -- parameter or member of a formal parameter of + -- the subprogram or of any of its parents. + Error_Msg_Sem + ("all-sensitized " & Disp_Node (Subprg) + & " can't call " & Disp_Node (Callee), Subprg); + Error_Msg_Sem + (" (as this subprogram reads (indirectly) a signal)", + Subprg); + end case; + end if; + + -- Keep in list. + if Callee_Bod = Null_Iir + or else + (Get_Kind (Callee) = Iir_Kind_Procedure_Declaration + and then Get_Purity_State (Callee) = Unknown + and then Depth /= Iir_Depth_Impure) + or else + (Get_Wait_State (Callee) = Unknown + and then (Kind /= K_Procedure + or else Get_Wait_State (Subprg) = Unknown)) + or else + (Vhdl_Std >= Vhdl_08 + and then + (Get_All_Sensitized_State (Callee) = Unknown + or else Get_All_Sensitized_State (Callee) = Read_Signal)) + then + Replace_Nth_Element (Callees_List, Npos, Callee); + Npos := Npos + 1; + end if; + end loop; + + -- End of callee loop. + if Npos = 0 then + Destroy_Iir_List (Callees_List); + Callees_List := Null_Iir_List; + if Kind = K_Procedure then + if Get_Purity_State (Subprg) = Unknown then + Set_Purity_State (Subprg, Maybe_Impure); + end if; + if Get_Wait_State (Subprg) = Unknown then + Set_Wait_State (Subprg, False); + end if; + end if; + if Kind = K_Procedure or Kind = K_Function then + if Get_All_Sensitized_State (Subprg) = Unknown then + Set_All_Sensitized_State (Subprg, No_Signal); + end if; + end if; + Res := Update_Pure_Done; + exit; + else + Set_Nbr_Elements (Callees_List, Npos); + end if; + end loop; + + Set_Callees_List (Callees_List_Holder, Callees_List); + + return Res; + end Update_And_Check_Pure_Wait; + + -- Check pure/wait/all-sensitized issues for SUBPRG (subprogram or + -- process). Return False if the analysis is incomplete (and must + -- be deferred). + function Root_Update_And_Check_Pure_Wait (Subprg : Iir) return Boolean + is + Res : Update_Pure_Status; + begin + Res := Update_And_Check_Pure_Wait (Subprg); + case Res is + when Update_Pure_Done => + return True; + when Update_Pure_Missing => + return False; + when Update_Pure_Unknown => + -- The purity/wait is unknown, but all callee were walked. + -- This means there are recursive calls but without violations. + if Get_Kind (Subprg) = Iir_Kind_Procedure_Declaration then + if Get_Purity_State (Subprg) = Unknown then + Set_Purity_State (Subprg, Maybe_Impure); + end if; + if Get_Wait_State (Subprg) = Unknown then + Set_Wait_State (Subprg, False); + end if; + end if; + if Get_Kind (Subprg) in Iir_Kinds_Subprogram_Declaration then + if Get_All_Sensitized_State (Subprg) = Unknown then + Set_All_Sensitized_State (Subprg, No_Signal); + end if; + end if; + return True; + end case; + end Root_Update_And_Check_Pure_Wait; + + procedure Sem_Analysis_Checks_List (Unit : Iir_Design_Unit; + Emit_Warnings : Boolean) + is + List : Iir_List := Get_Analysis_Checks_List (Unit); + El : Iir; + Npos : Natural; + Keep : Boolean; + Callees : Iir_List; + Callee : Iir; + begin + if List = Null_Iir_List then + -- Return now if there is nothing to check. + return; + end if; + + Npos := 0; + for I in Natural loop + El := Get_Nth_Element (List, I); + exit when El = Null_Iir; + Keep := False; + case Get_Kind (El) is + when Iir_Kind_Function_Declaration => + -- FIXME: remove from list if fully tested ? + if not Root_Update_And_Check_Pure_Wait (El) then + Keep := True; + if Emit_Warnings then + Callees := Get_Callees_List (El); + pragma Assert (Callees /= Null_Iir_List); + Warning_Msg_Sem + ("can't assert that all calls in " & Disp_Node (El) + & " are pure or have not wait; " + & "will be checked at elaboration", El); + Callee := Get_Nth_Element (Callees, 0); + -- FIXME: could improve this message by displaying the + -- chain of calls until the first subprograms in + -- unknown state. + Warning_Msg_Sem + ("(first such call is to " & Disp_Node (Callee) & ")", + Callee); + end if; + end if; + when Iir_Kind_Sensitized_Process_Statement => + if not Root_Update_And_Check_Pure_Wait (El) then + Keep := True; + if Emit_Warnings then + Warning_Msg_Sem + ("can't assert that " & Disp_Node (El) + & " has not wait; will be checked at elaboration", El); + end if; + end if; + when others => + Error_Kind ("sem_analysis_checks_list", El); + end case; + if Keep then + Replace_Nth_Element (List, Npos, El); + Npos := Npos + 1; + end if; + end loop; + if Npos = 0 then + Destroy_Iir_List (List); + Set_Analysis_Checks_List (Unit, Null_Iir_List); + else + Set_Nbr_Elements (List, Npos); + end if; + end Sem_Analysis_Checks_List; + + -- Return true if package declaration DECL needs a body. + -- Ie, it contains subprogram specification or deferred constants. + function Package_Need_Body_P (Decl: Iir_Package_Declaration) + return Boolean + is + El: Iir; + Def : Iir; + begin + El := Get_Declaration_Chain (Decl); + while El /= Null_Iir loop + case Get_Kind (El) is + when Iir_Kind_Function_Declaration + | Iir_Kind_Procedure_Declaration => + return True; + when Iir_Kind_Constant_Declaration => + if Get_Default_Value (El) = Null_Iir then + return True; + end if; + when Iir_Kind_Variable_Declaration + | Iir_Kind_File_Declaration + | Iir_Kind_Signal_Declaration + | Iir_Kind_Object_Alias_Declaration + | Iir_Kind_Non_Object_Alias_Declaration + | Iir_Kind_Group_Template_Declaration + | Iir_Kind_Group_Declaration => + null; + when Iir_Kind_Type_Declaration => + Def := Get_Type_Definition (El); + if Def /= Null_Iir + and then Get_Kind (Def) = Iir_Kind_Protected_Type_Declaration + then + return True; + end if; + when Iir_Kind_Anonymous_Type_Declaration + | Iir_Kind_Subtype_Declaration => + null; + when Iir_Kind_Implicit_Function_Declaration + | Iir_Kind_Implicit_Procedure_Declaration => + null; + when Iir_Kind_Attribute_Declaration + | Iir_Kind_Attribute_Specification => + null; + when Iir_Kind_Disconnection_Specification => + null; + when Iir_Kind_Use_Clause => + null; + when Iir_Kind_Component_Declaration => + null; + when Iir_Kind_Protected_Type_Body => + null; + when Iir_Kind_Nature_Declaration + | Iir_Kind_Subnature_Declaration => + null; + when Iir_Kind_Terminal_Declaration => + null; + when others => + Error_Kind ("package_need_body_p", El); + end case; + El := Get_Chain (El); + end loop; + return False; + end Package_Need_Body_P; + + -- LRM 2.5 Package Declarations. + procedure Sem_Package_Declaration (Decl: Iir_Package_Declaration) + is + Unit : Iir_Design_Unit; + Implicit : Implicit_Signal_Declaration_Type; + Header : constant Iir := Get_Package_Header (Decl); + begin + Unit := Get_Design_Unit (Decl); + Sem_Scopes.Add_Name (Decl); + Set_Visible_Flag (Decl, True); + Xref_Decl (Decl); + + -- Identify IEEE.Std_Logic_1164 for VHDL08. + if Get_Identifier (Decl) = Std_Names.Name_Std_Logic_1164 + and then (Get_Identifier (Get_Library (Get_Design_File (Unit))) + = Std_Names.Name_Ieee) + then + Ieee.Std_Logic_1164.Std_Logic_1164_Pkg := Decl; + end if; + + -- LRM93 10.1 Declarative Region + -- 4. A package declaration, together with the corresponding + -- body (if any). + Open_Declarative_Region; + + Push_Signals_Declarative_Part (Implicit, Decl); + + if Header /= Null_Iir then + Sem_Interface_Chain + (Get_Generic_Chain (Header), Generic_Interface_List); + if Get_Generic_Map_Aspect_Chain (Header) /= Null_Iir then + -- FIXME: todo + raise Internal_Error; + end if; + end if; + + Sem_Declaration_Chain (Decl); + -- GHDL: subprogram bodies appear in package body. + + Pop_Signals_Declarative_Part (Implicit); + Close_Declarative_Region; + Set_Need_Body (Decl, Package_Need_Body_P (Decl)); + end Sem_Package_Declaration; + + -- LRM 2.6 Package Bodies. + procedure Sem_Package_Body (Decl: Iir) + is + Package_Ident: Name_Id; + Design_Unit: Iir_Design_Unit; + Package_Decl: Iir; + begin + -- First, find the package declaration. + Package_Ident := Get_Identifier (Decl); + Design_Unit := Libraries.Load_Primary_Unit + (Get_Library (Get_Design_File (Get_Current_Design_Unit)), + Package_Ident, Decl); + if Design_Unit = Null_Iir then + Error_Msg_Sem ("package '" & Name_Table.Image (Package_Ident) + & "' was not analysed", + Decl); + return; + end if; + Package_Decl := Get_Library_Unit (Design_Unit); + if Get_Kind (Package_Decl) /= Iir_Kind_Package_Declaration then + Error_Msg_Sem + ("primary unit '" & Name_Table.Image (Package_Ident) + & "' is not a package", Decl); + return; + end if; + + -- Emit a warning is a body is not necessary. + if not Get_Need_Body (Package_Decl) then + Warning_Msg_Sem + (Disp_Node (Package_Decl) & " does not require a body", Decl); + end if; + + Set_Package (Decl, Package_Decl); + Xref_Body (Decl, Package_Decl); + Set_Package_Body (Package_Decl, Decl); + Add_Dependence (Design_Unit); + + Add_Name (Design_Unit); + + -- Add the context clauses from the primary unit. + Add_Context_Clauses (Design_Unit); + + -- LRM93 10.1 Declarative Region + -- 4. A package declaration, together with the corresponding + -- body (if any). + Open_Declarative_Region; + + Sem_Scopes.Add_Package_Declarations (Package_Decl); + + Sem_Declaration_Chain (Decl); + Check_Full_Declaration (Decl, Decl); + Check_Full_Declaration (Package_Decl, Decl); + + Close_Declarative_Region; + end Sem_Package_Body; + + function Sem_Uninstantiated_Package_Name (Decl : Iir) return Iir + is + Name : Iir; + Pkg : Iir; + begin + Name := Sem_Denoting_Name (Get_Uninstantiated_Package_Name (Decl)); + Set_Uninstantiated_Package_Name (Decl, Name); + Pkg := Get_Named_Entity (Name); + if Get_Kind (Pkg) /= Iir_Kind_Package_Declaration then + Error_Class_Match (Name, "package"); + + -- What could be done ? + return Null_Iir; + elsif not Is_Uninstantiated_Package (Pkg) then + Error_Msg_Sem + (Disp_Node (Pkg) & " is not an uninstantiated package", Name); + + -- What could be done ? + return Null_Iir; + end if; + + return Pkg; + end Sem_Uninstantiated_Package_Name; + + -- LRM08 4.9 Package Instantiation Declaration + procedure Sem_Package_Instantiation_Declaration (Decl : Iir) + is + Hdr : Iir; + Pkg : Iir; + Bod : Iir_Design_Unit; + begin + Sem_Scopes.Add_Name (Decl); + Set_Visible_Flag (Decl, True); + Xref_Decl (Decl); + + -- LRM08 4.9 + -- The uninstantiated package name shall denote an uninstantiated + -- package declared in a package declaration. + Pkg := Sem_Uninstantiated_Package_Name (Decl); + if Pkg = Null_Iir then + -- What could be done ? + return; + end if; + + -- LRM08 4.9 + -- The generic map aspect, if present, optionally associates a single + -- actual with each formal generic (or member thereof) in the + -- corresponding package declaration. Each formal generic (or member + -- thereof) shall be associated at most once. + + -- GHDL: the generics are first instantiated (ie copied) and then + -- the actuals are associated with the instantiated formal. + -- FIXME: do it in Instantiate_Package_Declaration ? + Hdr := Get_Package_Header (Pkg); + if Sem_Generic_Association_Chain (Hdr, Decl) then + Sem_Inst.Instantiate_Package_Declaration (Decl, Pkg); + else + -- FIXME: stop analysis here ? + null; + end if; + + -- FIXME: unless the parent is a package declaration library unit, the + -- design unit depends on the body. + Bod := Libraries.Load_Secondary_Unit + (Get_Design_Unit (Pkg), Null_Identifier, Decl); + if Bod /= Null_Iir then + Add_Dependence (Bod); + end if; + end Sem_Package_Instantiation_Declaration; + + -- LRM 10.4 Use Clauses. + procedure Sem_Use_Clause (Clauses: Iir_Use_Clause) + is + Clause : Iir_Use_Clause; + Name: Iir; + Prefix: Iir; + Name_Prefix : Iir; + begin + Clause := Clauses; + loop + -- LRM93 10.4 + -- A use clause achieves direct visibility of declarations that are + -- visible by selection. + -- Each selected name is a use clause identifies one or more + -- declarations that will potentialy become directly visible. + + Name := Get_Selected_Name (Clause); + case Get_Kind (Name) is + when Iir_Kind_Selected_By_All_Name + | Iir_Kind_Selected_Name => + Name_Prefix := Get_Prefix (Name); + when others => + Error_Msg_Sem ("use clause allows only selected name", Name); + return; + end case; + + Name_Prefix := Sem_Denoting_Name (Name_Prefix); + Set_Prefix (Name, Name_Prefix); + Prefix := Get_Named_Entity (Name_Prefix); + if Is_Error (Prefix) then + -- FIXME: continue with the clauses + return; + end if; + + -- LRM 10.4 Use Clauses + -- + -- If the suffix of the selected name is [...], then the + -- selected name identifies only the declaration(s) of that + -- [...] contained within the package or library denoted by + -- the prefix of the selected name. + -- + -- If the suffix is the reserved word ALL, then the selected name + -- identifies all declarations that are contained within the package + -- or library denoted by the prefix of the selected name. + -- + -- GHDL: therefore, the suffix must be either a package or a library. + case Get_Kind (Prefix) is + when Iir_Kind_Library_Declaration => + null; + when Iir_Kind_Package_Instantiation_Declaration + | Iir_Kind_Interface_Package_Declaration => + null; + when Iir_Kind_Package_Declaration => + -- LRM08 12.4 Use clauses + -- It is an error if the prefix of a selected name in a use + -- clause denotes an uninstantiated package. + if Is_Uninstantiated_Package (Prefix) then + Error_Msg_Sem + ("use of uninstantiated package is not allowed", + Name_Prefix); + return; + end if; + when others => + Error_Msg_Sem + ("prefix must designate a package or a library", Prefix); + return; + end case; + + case Get_Kind (Name) is + when Iir_Kind_Selected_Name => + Sem_Name (Name); + case Get_Kind (Get_Named_Entity (Name)) is + when Iir_Kind_Error => + -- Continue in case of error. + null; + when Iir_Kind_Overload_List => + -- Analyze is correct as is. + null; + when others => + Name := Finish_Sem_Name (Name); + Set_Selected_Name (Clause, Name); + end case; + when Iir_Kind_Selected_By_All_Name => + null; + when others => + raise Internal_Error; + end case; + + Clause := Get_Use_Clause_Chain (Clause); + exit when Clause = Null_Iir; + end loop; + + -- LRM 10.4 + -- For each use clause, there is a certain region of text called the + -- scope of the use clause. This region starts immediatly after the + -- use clause. + Sem_Scopes.Add_Use_Clause (Clauses); + end Sem_Use_Clause; + + -- LRM 11.2 Design Libraries. + procedure Sem_Library_Clause (Decl: Iir_Library_Clause) + is + Ident : Name_Id; + Lib: Iir; + begin + -- GHDL: 'redeclaration' is handled in sem_scopes. + + Ident := Get_Identifier (Decl); + Lib := Libraries.Get_Library (Ident, Get_Location (Decl)); + if Lib = Null_Iir then + Error_Msg_Sem + ("no resource library """ & Name_Table.Image (Ident) & """", Decl); + else + Set_Library_Declaration (Decl, Lib); + Sem_Scopes.Add_Name (Lib, Ident, False); + Set_Visible_Flag (Lib, True); + Xref_Ref (Decl, Lib); + end if; + end Sem_Library_Clause; + + -- LRM 11.3 Context Clauses. + procedure Sem_Context_Clauses (Design_Unit: Iir_Design_Unit) + is + El: Iir; + begin + El := Get_Context_Items (Design_Unit); + while El /= Null_Iir loop + case Get_Kind (El) is + when Iir_Kind_Use_Clause => + Sem_Use_Clause (El); + when Iir_Kind_Library_Clause => + Sem_Library_Clause (El); + when others => + Error_Kind ("sem_context_clauses", El); + end case; + El := Get_Chain (El); + end loop; + end Sem_Context_Clauses; + + -- Access to the current design unit. This is set, saved, restored, cleared + -- by the procedure semantic. + Current_Design_Unit: Iir_Design_Unit := Null_Iir; + + function Get_Current_Design_Unit return Iir_Design_Unit is + begin + return Current_Design_Unit; + end Get_Current_Design_Unit; + + -- LRM 11.1 Design units. + procedure Semantic (Design_Unit: Iir_Design_Unit) + is + El: Iir; + Old_Design_Unit: Iir_Design_Unit; + Implicit : Implicit_Signal_Declaration_Type; + begin + -- Sanity check: can analyze either previously analyzed unit or just + -- parsed unit. + case Get_Date (Design_Unit) is + when Date_Parsed => + Set_Date (Design_Unit, Date_Analyzing); + when Date_Valid => + null; + when Date_Obsolete => + -- This happens only when design files are added into the library + -- and keeping obsolete units (eg: to pretty print a file). + Set_Date (Design_Unit, Date_Analyzing); + when others => + raise Internal_Error; + end case; + + -- Save and set current_design_unit. + Old_Design_Unit := Current_Design_Unit; + Current_Design_Unit := Design_Unit; + Push_Signals_Declarative_Part (Implicit, Null_Iir); + + -- Be sure the name table is empty. + -- It is empty at start-up, or saved before recursing. + pragma Debug (Name_Table.Assert_No_Infos); + + -- LRM02 10.1 Declarative Region. + -- In addition to the above declarative region, there is a root + -- declarative region, not associated with a portion of the text of the + -- description, but encompassing any given primary unit. At the + -- beginning of the analysis of a given primary unit, there are no + -- declarations whose scopes (see 10.2) are within the root declarative + -- region. Moreover, the root declarative region associated with any + -- given secondary unit is the root declarative region of the + -- corresponding primary unit. + -- GHDL: for any revision of VHDL, a root declarative region is created, + -- due to reasons given by LCS 3 (VHDL Issue # 1028). + Open_Declarative_Region; + + -- Set_Dependence_List (Design_Unit, +-- Create_Iir (Iir_Kind_Design_Unit_List)); + + -- LRM 11.2 + -- Every design unit is assumed to contain the following implicit + -- context items as part of its context clause: + -- library STD, WORK; use STD.STANDARD.all; + Sem_Scopes.Add_Name (Libraries.Std_Library, Std_Names.Name_Std, False); + Sem_Scopes.Add_Name (Get_Library (Get_Design_File (Design_Unit)), + Std_Names.Name_Work, + False); + Sem_Scopes.Use_All_Names (Standard_Package); + if Get_Dependence_List (Design_Unit) = Null_Iir_List then + Set_Dependence_List (Design_Unit, Create_Iir_List); + end if; + Add_Dependence (Std_Standard_Unit); + + -- Semantic on context clauses. + Sem_Context_Clauses (Design_Unit); + + -- semantic on the library unit. + El := Get_Library_Unit (Design_Unit); + case Get_Kind (El) is + when Iir_Kind_Entity_Declaration => + Sem_Entity_Declaration (El); + when Iir_Kind_Architecture_Body => + Sem_Architecture_Body (El); + when Iir_Kind_Package_Declaration => + Sem_Package_Declaration (El); + when Iir_Kind_Package_Body => + Sem_Package_Body (El); + when Iir_Kind_Configuration_Declaration => + Sem_Configuration_Declaration (El); + when Iir_Kind_Package_Instantiation_Declaration => + Sem_Package_Instantiation_Declaration (El); + when others => + Error_Kind ("semantic", El); + end case; + + Close_Declarative_Region; + + if Get_Date (Design_Unit) = Date_Analyzing then + Set_Date (Design_Unit, Date_Analyzed); + end if; + + if Get_Analysis_Checks_List (Design_Unit) /= Null_Iir_List then + Sem_Analysis_Checks_List (Design_Unit, False); + end if; + + -- Restore current_design_unit. + Current_Design_Unit := Old_Design_Unit; + Pop_Signals_Declarative_Part (Implicit); + end Semantic; +end Sem; |