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Diffstat (limited to 'gcc/ada/rtsfind.adb')
| -rw-r--r-- | gcc/ada/rtsfind.adb | 1490 |
1 files changed, 1490 insertions, 0 deletions
diff --git a/gcc/ada/rtsfind.adb b/gcc/ada/rtsfind.adb new file mode 100644 index 000000000..9742cb20b --- /dev/null +++ b/gcc/ada/rtsfind.adb @@ -0,0 +1,1490 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- R T S F I N D -- +-- -- +-- B o d y -- +-- -- +-- Copyright (C) 1992-2010, Free Software Foundation, Inc. -- +-- -- +-- GNAT is free software; you can redistribute it and/or modify it under -- +-- terms of the GNU General Public License as published by the Free Soft- -- +-- ware Foundation; either version 3, or (at your option) any later ver- -- +-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- +-- OUT 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 distributed with GNAT; see file COPYING3. If not, go to -- +-- http://www.gnu.org/licenses for a complete copy of the license. -- +-- -- +-- GNAT was originally developed by the GNAT team at New York University. -- +-- Extensive contributions were provided by Ada Core Technologies Inc. -- +-- -- +------------------------------------------------------------------------------ + +with Atree; use Atree; +with Casing; use Casing; +with Csets; use Csets; +with Debug; use Debug; +with Einfo; use Einfo; +with Elists; use Elists; +with Errout; use Errout; +with Exp_Dist; use Exp_Dist; +with Fname; use Fname; +with Fname.UF; use Fname.UF; +with Lib; use Lib; +with Lib.Load; use Lib.Load; +with Namet; use Namet; +with Nlists; use Nlists; +with Nmake; use Nmake; +with Output; use Output; +with Opt; use Opt; +with Restrict; use Restrict; +with Sem; use Sem; +with Sem_Ch7; use Sem_Ch7; +with Sem_Dist; use Sem_Dist; +with Sem_Util; use Sem_Util; +with Sinfo; use Sinfo; +with Stand; use Stand; +with Snames; use Snames; +with Tbuild; use Tbuild; +with Uname; use Uname; + +package body Rtsfind is + + RTE_Available_Call : Boolean := False; + -- Set True during call to RTE from RTE_Available (or from call to + -- RTE_Record_Component from RTE_Record_Component_Available). Tells + -- the called subprogram to set RTE_Is_Available to False rather than + -- generating an error message. + + RTE_Is_Available : Boolean; + -- Set True by RTE_Available on entry. When RTE_Available_Call is set + -- True, set False if RTE would otherwise generate an error message. + + ---------------- + -- Unit table -- + ---------------- + + -- The unit table has one entry for each unit included in the definition + -- of the type RTU_Id in the spec. The table entries are initialized in + -- Initialize to set the Entity field to Empty, indicating that the + -- corresponding unit has not yet been loaded. The fields are set when + -- a unit is loaded to contain the defining entity for the unit, the + -- unit name, and the unit number. + + -- Note that a unit can be loaded either by a call to find an entity + -- within the unit (e.g. RTE), or by an explicit with of the unit. In + -- the latter case it is critical to make a call to Set_RTU_Loaded to + -- ensure that the entry in this table reflects the load. + + -- A unit retrieved through rtsfind may end up in the context of several + -- other units, in addition to the main unit. These additional with_clauses + -- are needed to generate a proper traversal order for Inspector. To + -- minimize somewhat the redundancy created by numerous calls to rtsfind + -- from different units, we keep track of the list of implicit with_clauses + -- already created for the current loaded unit. + + type RT_Unit_Table_Record is record + Entity : Entity_Id; + Uname : Unit_Name_Type; + First_Implicit_With : Node_Id; + Unum : Unit_Number_Type; + end record; + + RT_Unit_Table : array (RTU_Id) of RT_Unit_Table_Record; + + -------------------------- + -- Runtime Entity Table -- + -------------------------- + + -- There is one entry in the runtime entity table for each entity that is + -- included in the definition of the RE_Id type in the spec. The entries + -- are set by Initialize_Rtsfind to contain Empty, indicating that the + -- entity has not yet been located. Once the entity is located for the + -- first time, its ID is stored in this array, so that subsequent calls + -- for the same entity can be satisfied immediately. + + -- NOTE: In order to avoid conflicts between record components and subprgs + -- that have the same name (i.e. subprogram External_Tag and + -- component External_Tag of package Ada.Tags) this table is not used + -- with Record_Components. + + RE_Table : array (RE_Id) of Entity_Id; + + -------------------------------- + -- Generation of with_clauses -- + -------------------------------- + + -- When a unit is implicitly loaded as a result of a call to RTE, it is + -- necessary to create one or two implicit with_clauses. We add such + -- with_clauses to the extended main unit if needed, and also to whatever + -- unit needs them, which is not necessarily the main unit. The former + -- ensures that the object is correctly loaded by the binder. The latter + -- is necessary for SofCheck Inspector. + + -- The field First_Implicit_With in the unit table record are used to + -- avoid creating duplicate with_clauses. + + ----------------------- + -- Local Subprograms -- + ----------------------- + + function Check_CRT (E : RE_Id; Eid : Entity_Id) return Entity_Id; + -- Check entity Eid to ensure that configurable run-time restrictions are + -- met. May generate an error message (if RTE_Available_Call is false) and + -- raise RE_Not_Available if entity E does not exist (e.g. Eid is Empty). + -- Above documentation not clear ??? + + procedure Entity_Not_Defined (Id : RE_Id); + -- Outputs error messages for an entity that is not defined in the run-time + -- library (the form of the error message is tailored for no run time or + -- configurable run time mode as required). + + function Get_Unit_Name (U_Id : RTU_Id) return Unit_Name_Type; + -- Retrieves the Unit Name given a unit id represented by its enumeration + -- value in RTU_Id. + + procedure Load_Fail (S : String; U_Id : RTU_Id; Id : RE_Id); + -- Internal procedure called if we can't successfully locate or process a + -- run-time unit. The parameters give information about the error message + -- to be given. S is a reason for failing to compile the file and U_Id is + -- the unit id. RE_Id is the RE_Id originally passed to RTE. The message in + -- S is one of the following: + -- + -- "not found" + -- "had parser errors" + -- "had semantic errors" + -- + -- The "not found" case is treated specially in that it is considered + -- a normal situation in configurable run-time mode, and generates + -- a warning, but is otherwise ignored. + + procedure Load_RTU + (U_Id : RTU_Id; + Id : RE_Id := RE_Null; + Use_Setting : Boolean := False); + -- Load the unit whose Id is given if not already loaded. The unit is + -- loaded and analyzed, and the entry in RT_Unit_Table is updated to + -- reflect the load. Use_Setting is used to indicate the initial setting + -- for the Is_Potentially_Use_Visible flag of the entity for the loaded + -- unit (if it is indeed loaded). A value of False means nothing special + -- need be done. A value of True indicates that this flag must be set to + -- True. It is needed only in the Text_IO_Kludge procedure, which may + -- materialize an entity of Text_IO (or [Wide_]Wide_Text_IO) that was + -- previously unknown. Id is the RE_Id value of the entity which was + -- originally requested. Id is used only for error message detail, and if + -- it is RE_Null, then the attempt to output the entity name is ignored. + + function Make_Unit_Name + (U : RT_Unit_Table_Record; + N : Node_Id) return Node_Id; + -- If the unit is a child unit, build fully qualified name for use in + -- With_Clause. + + procedure Maybe_Add_With (U : in out RT_Unit_Table_Record); + -- If necessary, add an implicit with_clause from the current unit to the + -- one represented by U. + + procedure Output_Entity_Name (Id : RE_Id; Msg : String); + -- Output continuation error message giving qualified name of entity + -- corresponding to Id, appending the string given by Msg. This call + -- is only effective in All_Errors mode. + + function RE_Chars (E : RE_Id) return Name_Id; + -- Given a RE_Id value returns the Chars of the corresponding entity + + procedure RTE_Error_Msg (Msg : String); + -- Generates a message by calling Error_Msg_N specifying Current_Error_Node + -- as the node location using the given Msg text. Special processing in the + -- case where RTE_Available_Call is set. In this case, no message is output + -- and instead RTE_Is_Available is set to False. Note that this can only be + -- used if you are sure that the message comes directly or indirectly from + -- a call to the RTE function. + + --------------- + -- Check_CRT -- + --------------- + + function Check_CRT (E : RE_Id; Eid : Entity_Id) return Entity_Id is + U_Id : constant RTU_Id := RE_Unit_Table (E); + + begin + if No (Eid) then + if RTE_Available_Call then + RTE_Is_Available := False; + else + Entity_Not_Defined (E); + end if; + + raise RE_Not_Available; + + -- Entity is available + + else + -- If in No_Run_Time mode and entity is not in one of the + -- specially permitted units, raise the exception. + + if No_Run_Time_Mode + and then not OK_No_Run_Time_Unit (U_Id) + then + Entity_Not_Defined (E); + raise RE_Not_Available; + end if; + + -- Otherwise entity is accessible + + return Eid; + end if; + end Check_CRT; + + ------------------------ + -- Entity_Not_Defined -- + ------------------------ + + procedure Entity_Not_Defined (Id : RE_Id) is + begin + if No_Run_Time_Mode then + + -- If the error occurs when compiling the body of a predefined + -- unit for inlining purposes, the body must be illegal in this + -- mode, and there is no point in continuing. + + if Is_Predefined_File_Name + (Unit_File_Name (Get_Source_Unit (Sloc (Current_Error_Node)))) + then + Error_Msg_N + ("construct not allowed in no run time mode!", + Current_Error_Node); + raise Unrecoverable_Error; + + else + RTE_Error_Msg ("|construct not allowed in no run time mode"); + end if; + + elsif Configurable_Run_Time_Mode then + RTE_Error_Msg ("|construct not allowed in this configuration>"); + else + RTE_Error_Msg ("run-time configuration error"); + end if; + + Output_Entity_Name (Id, "not defined"); + end Entity_Not_Defined; + + ------------------- + -- Get_Unit_Name -- + ------------------- + + function Get_Unit_Name (U_Id : RTU_Id) return Unit_Name_Type is + Uname_Chars : constant String := RTU_Id'Image (U_Id); + + begin + Name_Len := Uname_Chars'Length; + Name_Buffer (1 .. Name_Len) := Uname_Chars; + Set_Casing (All_Lower_Case); + + if U_Id in Ada_Child then + Name_Buffer (4) := '.'; + + if U_Id in Ada_Calendar_Child then + Name_Buffer (13) := '.'; + + elsif U_Id in Ada_Dispatching_Child then + Name_Buffer (16) := '.'; + + elsif U_Id in Ada_Finalization_Child then + Name_Buffer (17) := '.'; + + elsif U_Id in Ada_Interrupts_Child then + Name_Buffer (15) := '.'; + + elsif U_Id in Ada_Real_Time_Child then + Name_Buffer (14) := '.'; + + elsif U_Id in Ada_Streams_Child then + Name_Buffer (12) := '.'; + + elsif U_Id in Ada_Strings_Child then + Name_Buffer (12) := '.'; + + elsif U_Id in Ada_Text_IO_Child then + Name_Buffer (12) := '.'; + + elsif U_Id in Ada_Wide_Text_IO_Child then + Name_Buffer (17) := '.'; + + elsif U_Id in Ada_Wide_Wide_Text_IO_Child then + Name_Buffer (22) := '.'; + end if; + + elsif U_Id in Interfaces_Child then + Name_Buffer (11) := '.'; + + elsif U_Id in System_Child then + Name_Buffer (7) := '.'; + + if U_Id in System_Strings_Child then + Name_Buffer (15) := '.'; + end if; + + if U_Id in System_Tasking_Child then + Name_Buffer (15) := '.'; + end if; + + if U_Id in System_Tasking_Restricted_Child then + Name_Buffer (26) := '.'; + end if; + + if U_Id in System_Tasking_Protected_Objects_Child then + Name_Buffer (33) := '.'; + end if; + + if U_Id in System_Tasking_Async_Delays_Child then + Name_Buffer (28) := '.'; + end if; + end if; + + -- Add %s at end for spec + + Name_Buffer (Name_Len + 1) := '%'; + Name_Buffer (Name_Len + 2) := 's'; + Name_Len := Name_Len + 2; + + return Name_Find; + end Get_Unit_Name; + + ---------------- + -- Initialize -- + ---------------- + + procedure Initialize is + begin + -- Initialize the unit table + + for J in RTU_Id loop + RT_Unit_Table (J).Entity := Empty; + end loop; + + for J in RE_Id loop + RE_Table (J) := Empty; + end loop; + + RTE_Is_Available := False; + end Initialize; + + ------------ + -- Is_RTE -- + ------------ + + function Is_RTE (Ent : Entity_Id; E : RE_Id) return Boolean is + E_Unit_Name : Unit_Name_Type; + Ent_Unit_Name : Unit_Name_Type; + + S : Entity_Id; + E1 : Entity_Id; + E2 : Entity_Id; + + begin + if No (Ent) then + return False; + + -- If E has already a corresponding entity, check it directly, + -- going to full views if they exist to deal with the incomplete + -- and private type cases properly. + + elsif Present (RE_Table (E)) then + E1 := Ent; + + if Is_Type (E1) and then Present (Full_View (E1)) then + E1 := Full_View (E1); + end if; + + E2 := RE_Table (E); + + if Is_Type (E2) and then Present (Full_View (E2)) then + E2 := Full_View (E2); + end if; + + return E1 = E2; + end if; + + -- If the unit containing E is not loaded, we already know that + -- the entity we have cannot have come from this unit. + + E_Unit_Name := Get_Unit_Name (RE_Unit_Table (E)); + + if not Is_Loaded (E_Unit_Name) then + return False; + end if; + + -- Here the unit containing the entity is loaded. We have not made + -- an explicit call to RTE to get the entity in question, but we may + -- have obtained a reference to it indirectly from some other entity + -- in the same unit, or some other unit that references it. + + -- Get the defining unit of the entity + + S := Scope (Ent); + + if Ekind (S) /= E_Package then + return False; + end if; + + Ent_Unit_Name := Get_Unit_Name (Unit_Declaration_Node (S)); + + -- If the defining unit of the entity we are testing is not the + -- unit containing E, then they cannot possibly match. + + if Ent_Unit_Name /= E_Unit_Name then + return False; + end if; + + -- If the units match, then compare the names (remember that no + -- overloading is permitted in entities fetched using Rtsfind). + + if RE_Chars (E) = Chars (Ent) then + RE_Table (E) := Ent; + + -- If front-end inlining is enabled, we may be within a body that + -- contains inlined functions, which has not been retrieved through + -- rtsfind, and therefore is not yet recorded in the RT_Unit_Table. + -- Add the unit information now, it must be fully available. + + declare + U : RT_Unit_Table_Record + renames RT_Unit_Table (RE_Unit_Table (E)); + begin + if No (U.Entity) then + U.Entity := S; + U.Uname := E_Unit_Name; + U.Unum := Get_Source_Unit (S); + end if; + end; + + return True; + else + return False; + end if; + end Is_RTE; + + ------------ + -- Is_RTU -- + ------------ + + function Is_RTU (Ent : Entity_Id; U : RTU_Id) return Boolean is + E : constant Entity_Id := RT_Unit_Table (U).Entity; + begin + return Present (E) and then E = Ent; + end Is_RTU; + + ---------------------------- + -- Is_Text_IO_Kludge_Unit -- + ---------------------------- + + function Is_Text_IO_Kludge_Unit (Nam : Node_Id) return Boolean is + Prf : Node_Id; + Sel : Node_Id; + + begin + if Nkind (Nam) /= N_Expanded_Name then + return False; + end if; + + Prf := Prefix (Nam); + Sel := Selector_Name (Nam); + + if Nkind (Sel) /= N_Expanded_Name + or else Nkind (Prf) /= N_Identifier + or else Chars (Prf) /= Name_Ada + then + return False; + end if; + + Prf := Prefix (Sel); + Sel := Selector_Name (Sel); + + return + Nkind (Prf) = N_Identifier + and then + (Chars (Prf) = Name_Text_IO + or else + Chars (Prf) = Name_Wide_Text_IO + or else + Chars (Prf) = Name_Wide_Wide_Text_IO) + and then + Nkind (Sel) = N_Identifier + and then + Chars (Sel) in Text_IO_Package_Name; + end Is_Text_IO_Kludge_Unit; + + --------------- + -- Load_Fail -- + --------------- + + procedure Load_Fail (S : String; U_Id : RTU_Id; Id : RE_Id) is + M : String (1 .. 100); + P : Natural := 0; + + begin + -- Output header message + + if Configurable_Run_Time_Mode then + RTE_Error_Msg ("construct not allowed in configurable run-time mode"); + else + RTE_Error_Msg ("run-time library configuration error"); + end if; + + -- Output file name and reason string + + M (1 .. 6) := "\file "; + P := 6; + + Get_Name_String + (Get_File_Name (RT_Unit_Table (U_Id).Uname, Subunit => False)); + M (P + 1 .. P + Name_Len) := Name_Buffer (1 .. Name_Len); + P := P + Name_Len; + + M (P + 1) := ' '; + P := P + 1; + + M (P + 1 .. P + S'Length) := S; + P := P + S'Length; + + RTE_Error_Msg (M (1 .. P)); + + -- Output entity name + + Output_Entity_Name (Id, "not available"); + + -- In configurable run time mode, we raise RE_Not_Available, and the + -- caller is expected to deal gracefully with this. In the case of a + -- call to RTE_Available, this exception will be caught in Rtsfind, + -- and result in a returned value of False for the call. + + if Configurable_Run_Time_Mode then + raise RE_Not_Available; + + -- Here we have a load failure in normal full run time mode. See if we + -- are in the context of an RTE_Available call. If so, we just raise + -- RE_Not_Available. This can happen if a unit is unavailable, which + -- happens for example in the VM case, where the run-time is not + -- complete, but we do not regard it as a configurable run-time. + -- If the caller has done an explicit call to RTE_Available, then + -- clearly the caller is prepared to deal with a result of False. + + elsif RTE_Available_Call then + RTE_Is_Available := False; + raise RE_Not_Available; + + -- If we are not in the context of an RTE_Available call, we are really + -- trying to load an entity that is not there, and that should never + -- happen, so in this case we signal a fatal error. + + else + raise Unrecoverable_Error; + end if; + end Load_Fail; + + -------------- + -- Load_RTU -- + -------------- + + procedure Load_RTU + (U_Id : RTU_Id; + Id : RE_Id := RE_Null; + Use_Setting : Boolean := False) + is + U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id); + Priv_Par : constant Elist_Id := New_Elmt_List; + Lib_Unit : Node_Id; + + procedure Save_Private_Visibility; + -- If the current unit is the body of child unit or the spec of a + -- private child unit, the private declarations of the parent(s) are + -- visible. If the unit to be loaded is another public sibling, its + -- compilation will affect the visibility of the common ancestors. + -- Indicate those that must be restored. + + procedure Restore_Private_Visibility; + -- Restore the visibility of ancestors after compiling RTU + + -------------------------------- + -- Restore_Private_Visibility -- + -------------------------------- + + procedure Restore_Private_Visibility is + E_Par : Elmt_Id; + + begin + E_Par := First_Elmt (Priv_Par); + while Present (E_Par) loop + if not In_Private_Part (Node (E_Par)) then + Install_Private_Declarations (Node (E_Par)); + end if; + + Next_Elmt (E_Par); + end loop; + end Restore_Private_Visibility; + + ----------------------------- + -- Save_Private_Visibility -- + ----------------------------- + + procedure Save_Private_Visibility is + Par : Entity_Id; + + begin + Par := Scope (Current_Scope); + while Present (Par) + and then Par /= Standard_Standard + loop + if Ekind (Par) = E_Package + and then Is_Compilation_Unit (Par) + and then In_Private_Part (Par) + then + Append_Elmt (Par, Priv_Par); + end if; + + Par := Scope (Par); + end loop; + end Save_Private_Visibility; + + -- Start of processing for Load_RTU + + begin + -- Nothing to do if unit is already loaded + + if Present (U.Entity) then + return; + end if; + + -- Note if secondary stack is used + + if U_Id = System_Secondary_Stack then + Opt.Sec_Stack_Used := True; + end if; + + -- Otherwise we need to load the unit, First build unit name + -- from the enumeration literal name in type RTU_Id. + + U.Uname := Get_Unit_Name (U_Id); + U. First_Implicit_With := Empty; + + -- Now do the load call, note that setting Error_Node to Empty is + -- a signal to Load_Unit that we will regard a failure to find the + -- file as a fatal error, and that it should not output any kind + -- of diagnostics, since we will take care of it here. + + -- We save style checking switches and turn off style checking for + -- loading the unit, since we don't want any style checking! + + declare + Save_Style_Check : constant Boolean := Style_Check; + begin + Style_Check := False; + U.Unum := + Load_Unit + (Load_Name => U.Uname, + Required => False, + Subunit => False, + Error_Node => Empty); + Style_Check := Save_Style_Check; + end; + + -- Check for bad unit load + + if U.Unum = No_Unit then + Load_Fail ("not found", U_Id, Id); + elsif Fatal_Error (U.Unum) then + Load_Fail ("had parser errors", U_Id, Id); + end if; + + -- Make sure that the unit is analyzed + + declare + Was_Analyzed : constant Boolean := + Analyzed (Cunit (Current_Sem_Unit)); + + begin + -- Pretend that the current unit is analyzed, in case it is System + -- or some such. This allows us to put some declarations, such as + -- exceptions and packed arrays of Boolean, into System even though + -- expanding them requires System... + + -- This is a bit odd but works fine. If the RTS unit does not depend + -- in any way on the current unit, then it never gets back into the + -- current unit's tree, and the change we make to the current unit + -- tree is never noticed by anyone (it is undone in a moment). That + -- is the normal situation. + + -- If the RTS Unit *does* depend on the current unit, for instance, + -- when you are compiling System, then you had better have finished + -- analyzing the part of System that is depended on before you try to + -- load the RTS Unit. This means having the code in System ordered in + -- an appropriate manner. + + Set_Analyzed (Cunit (Current_Sem_Unit), True); + + if not Analyzed (Cunit (U.Unum)) then + + -- If the unit is already loaded through a limited_with_clause, + -- the relevant entities must already be available. We do not + -- want to load and analyze the unit because this would create + -- a real semantic dependence when the purpose of the limited_with + -- is precisely to avoid such. + + if From_With_Type (Cunit_Entity (U.Unum)) then + null; + + else + Save_Private_Visibility; + Semantics (Cunit (U.Unum)); + Restore_Private_Visibility; + + if Fatal_Error (U.Unum) then + Load_Fail ("had semantic errors", U_Id, Id); + end if; + end if; + end if; + + -- Undo the pretence + + Set_Analyzed (Cunit (Current_Sem_Unit), Was_Analyzed); + end; + + Lib_Unit := Unit (Cunit (U.Unum)); + U.Entity := Defining_Entity (Lib_Unit); + + if Use_Setting then + Set_Is_Potentially_Use_Visible (U.Entity, True); + end if; + end Load_RTU; + + -------------------- + -- Make_Unit_Name -- + -------------------- + + function Make_Unit_Name + (U : RT_Unit_Table_Record; + N : Node_Id) return Node_Id is + + Nam : Node_Id; + Scop : Entity_Id; + + begin + Nam := New_Reference_To (U.Entity, Standard_Location); + Scop := Scope (U.Entity); + + if Nkind (N) = N_Defining_Program_Unit_Name then + while Scop /= Standard_Standard loop + Nam := + Make_Expanded_Name (Standard_Location, + Chars => Chars (U.Entity), + Prefix => New_Reference_To (Scop, Standard_Location), + Selector_Name => Nam); + Set_Entity (Nam, U.Entity); + + Scop := Scope (Scop); + end loop; + end if; + + return Nam; + end Make_Unit_Name; + + -------------------- + -- Maybe_Add_With -- + -------------------- + + procedure Maybe_Add_With (U : in out RT_Unit_Table_Record) is + begin + -- We do not need to generate a with_clause for a call issued from + -- RTE_Component_Available. However, for CodePeer, we need these + -- additional with's, because for a sequence like "if RTE_Available (X) + -- then ... RTE (X)" the RTE call fails to create some necessary + -- with's. + + if RTE_Available_Call and then not Generate_SCIL then + return; + end if; + + -- Avoid creating directly self-referential with clauses + + if Current_Sem_Unit = U.Unum then + return; + end if; + + -- Add the with_clause, if not already in the context of the + -- current compilation unit. + + declare + LibUnit : constant Node_Id := Unit (Cunit (U.Unum)); + Clause : Node_Id; + Withn : Node_Id; + + begin + Clause := U.First_Implicit_With; + while Present (Clause) loop + if Parent (Clause) = Cunit (Current_Sem_Unit) then + return; + end if; + + Clause := Next_Implicit_With (Clause); + end loop; + + Withn := + Make_With_Clause (Standard_Location, + Name => + Make_Unit_Name + (U, Defining_Unit_Name (Specification (LibUnit)))); + + Set_Library_Unit (Withn, Cunit (U.Unum)); + Set_Corresponding_Spec (Withn, U.Entity); + Set_First_Name (Withn, True); + Set_Implicit_With (Withn, True); + Set_Next_Implicit_With (Withn, U.First_Implicit_With); + + U.First_Implicit_With := Withn; + + Mark_Rewrite_Insertion (Withn); + Append (Withn, Context_Items (Cunit (Current_Sem_Unit))); + Check_Restriction_No_Dependence (Name (Withn), Current_Error_Node); + end; + end Maybe_Add_With; + + ------------------------ + -- Output_Entity_Name -- + ------------------------ + + procedure Output_Entity_Name (Id : RE_Id; Msg : String) is + M : String (1 .. 2048); + P : Natural := 0; + -- M (1 .. P) is current message to be output + + RE_Image : constant String := RE_Id'Image (Id); + + begin + if Id = RE_Null then + return; + end if; + + M (1 .. 9) := "\entity """; + P := 9; + + -- Add unit name to message, excluding %s or %b at end + + Get_Name_String (Get_Unit_Name (RE_Unit_Table (Id))); + Name_Len := Name_Len - 2; + Set_Casing (Mixed_Case); + M (P + 1 .. P + Name_Len) := Name_Buffer (1 .. Name_Len); + P := P + Name_Len; + + -- Add a qualifying period + + M (P + 1) := '.'; + P := P + 1; + + -- Add entity name and closing quote to message + + Name_Len := RE_Image'Length - 3; + Name_Buffer (1 .. Name_Len) := RE_Image (4 .. RE_Image'Length); + Set_Casing (Mixed_Case); + M (P + 1 .. P + Name_Len) := Name_Buffer (1 .. Name_Len); + P := P + Name_Len; + M (P + 1) := '"'; + P := P + 1; + + -- Add message + + M (P + 1) := ' '; + P := P + 1; + M (P + 1 .. P + Msg'Length) := Msg; + P := P + Msg'Length; + + -- Output message at current error node location + + RTE_Error_Msg (M (1 .. P)); + end Output_Entity_Name; + + -------------- + -- RE_Chars -- + -------------- + + function RE_Chars (E : RE_Id) return Name_Id is + RE_Name_Chars : constant String := RE_Id'Image (E); + + begin + -- Copy name skipping initial RE_ or RO_XX characters + + if RE_Name_Chars (1 .. 2) = "RE" then + for J in 4 .. RE_Name_Chars'Last loop + Name_Buffer (J - 3) := Fold_Lower (RE_Name_Chars (J)); + end loop; + + Name_Len := RE_Name_Chars'Length - 3; + + else + for J in 7 .. RE_Name_Chars'Last loop + Name_Buffer (J - 6) := Fold_Lower (RE_Name_Chars (J)); + end loop; + + Name_Len := RE_Name_Chars'Length - 6; + end if; + + return Name_Find; + end RE_Chars; + + --------- + -- RTE -- + --------- + + function RTE (E : RE_Id) return Entity_Id is + U_Id : constant RTU_Id := RE_Unit_Table (E); + U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id); + + Lib_Unit : Node_Id; + Pkg_Ent : Entity_Id; + Ename : Name_Id; + + -- The following flag is used to disable front-end inlining when RTE + -- is invoked. This prevents the analysis of other runtime bodies when + -- a particular spec is loaded through Rtsfind. This is both efficient, + -- and it prevents spurious visibility conflicts between use-visible + -- user entities, and entities in run-time packages. + + Save_Front_End_Inlining : Boolean; + + procedure Check_RPC; + -- Reject programs that make use of distribution features not supported + -- on the current target. Also check that the PCS is compatible with + -- the code generator version. On such targets (VMS, Vxworks, others?) + -- we provide a minimal body for System.Rpc that only supplies an + -- implementation of Partition_Id. + + function Find_Local_Entity (E : RE_Id) return Entity_Id; + -- This function is used when entity E is in this compilation's main + -- unit. It gets the value from the already compiled declaration. + + --------------- + -- Check_RPC -- + --------------- + + procedure Check_RPC is + begin + -- Bypass this check if debug flag -gnatdR set + + if Debug_Flag_RR then + return; + end if; + + -- Otherwise we need the check if we are going after one of the + -- critical entities in System.RPC / System.Partition_Interface. + + if E = RE_Do_Rpc + or else + E = RE_Do_Apc + or else + E = RE_Params_Stream_Type + or else + E = RE_Request_Access + then + -- If generating RCI stubs, check that we have a real PCS + + if (Distribution_Stub_Mode = Generate_Receiver_Stub_Body + or else + Distribution_Stub_Mode = Generate_Caller_Stub_Body) + and then Get_PCS_Name = Name_No_DSA + then + Set_Standard_Error; + Write_Str ("distribution feature not supported"); + Write_Eol; + raise Unrecoverable_Error; + + -- In all cases, check Exp_Dist and System.Partition_Interface + -- consistency. + + elsif Get_PCS_Version /= + Exp_Dist.PCS_Version_Number (Get_PCS_Name) + then + Set_Standard_Error; + Write_Str ("PCS version mismatch: expander "); + Write_Int (Exp_Dist.PCS_Version_Number (Get_PCS_Name)); + Write_Str (", PCS ("); + Write_Name (Get_PCS_Name); + Write_Str (") "); + Write_Int (Get_PCS_Version); + Write_Eol; + raise Unrecoverable_Error; + end if; + end if; + end Check_RPC; + + ----------------------- + -- Find_Local_Entity -- + ----------------------- + + function Find_Local_Entity (E : RE_Id) return Entity_Id is + RE_Str : constant String := RE_Id'Image (E); + Nam : Name_Id; + Ent : Entity_Id; + + Save_Nam : constant String := Name_Buffer (1 .. Name_Len); + -- Save name buffer and length over call + + begin + Name_Len := Natural'Max (0, RE_Str'Length - 3); + Name_Buffer (1 .. Name_Len) := + RE_Str (RE_Str'First + 3 .. RE_Str'Last); + + Nam := Name_Find; + Ent := Entity_Id (Get_Name_Table_Info (Nam)); + + Name_Len := Save_Nam'Length; + Name_Buffer (1 .. Name_Len) := Save_Nam; + + return Ent; + end Find_Local_Entity; + + -- Start of processing for RTE + + begin + -- Doing a rtsfind in system.ads is special, as we cannot do this + -- when compiling System itself. So if we are compiling system then + -- we should already have acquired and processed the declaration + -- of the entity. The test is to see if this compilation's main unit + -- is System. If so, return the value from the already compiled + -- declaration and otherwise do a regular find. + + -- Not pleasant, but these kinds of annoying recursion when + -- writing an Ada compiler in Ada have to be broken somewhere! + + if Present (Main_Unit_Entity) + and then Chars (Main_Unit_Entity) = Name_System + and then Analyzed (Main_Unit_Entity) + and then not Is_Child_Unit (Main_Unit_Entity) + then + return Check_CRT (E, Find_Local_Entity (E)); + end if; + + Save_Front_End_Inlining := Front_End_Inlining; + Front_End_Inlining := False; + + -- Load unit if unit not previously loaded + + if No (RE_Table (E)) then + Load_RTU (U_Id, Id => E); + Lib_Unit := Unit (Cunit (U.Unum)); + + -- In the subprogram case, we are all done, the entity we want + -- is the entity for the subprogram itself. Note that we do not + -- bother to check that it is the entity that was requested. + -- the only way that could fail to be the case is if runtime is + -- hopelessly misconfigured, and it isn't worth testing for this. + + if Nkind (Lib_Unit) = N_Subprogram_Declaration then + RE_Table (E) := U.Entity; + + -- Otherwise we must have the package case. First check package + -- entity itself (e.g. RTE_Name for System.Interrupts.Name) + + else + pragma Assert (Nkind (Lib_Unit) = N_Package_Declaration); + Ename := RE_Chars (E); + + -- First we search the package entity chain. If the package + -- only has a limited view, scan the corresponding list of + -- incomplete types. + + if From_With_Type (U.Entity) then + Pkg_Ent := First_Entity (Limited_View (U.Entity)); + else + Pkg_Ent := First_Entity (U.Entity); + end if; + + while Present (Pkg_Ent) loop + if Ename = Chars (Pkg_Ent) then + RE_Table (E) := Pkg_Ent; + Check_RPC; + goto Found; + end if; + + Next_Entity (Pkg_Ent); + end loop; + + -- If we did not find the entity in the package entity chain, + -- then check if the package entity itself matches. Note that + -- we do this check after searching the entity chain, since + -- the rule is that in case of ambiguity, we prefer the entity + -- defined within the package, rather than the package itself. + + if Ename = Chars (U.Entity) then + RE_Table (E) := U.Entity; + end if; + + -- If we didn't find the entity we want, something is wrong. + -- We just leave RE_Table (E) set to Empty and the appropriate + -- action will be taken by Check_CRT when we exit. + + end if; + end if; + + <<Found>> + Maybe_Add_With (U); + + Front_End_Inlining := Save_Front_End_Inlining; + return Check_CRT (E, RE_Table (E)); + end RTE; + + ------------------- + -- RTE_Available -- + ------------------- + + function RTE_Available (E : RE_Id) return Boolean is + Dummy : Entity_Id; + pragma Warnings (Off, Dummy); + + Result : Boolean; + + Save_RTE_Available_Call : constant Boolean := RTE_Available_Call; + Save_RTE_Is_Available : constant Boolean := RTE_Is_Available; + -- These are saved recursively because the call to load a unit + -- caused by an upper level call may perform a recursive call + -- to this routine during analysis of the corresponding unit. + + begin + RTE_Available_Call := True; + RTE_Is_Available := True; + Dummy := RTE (E); + Result := RTE_Is_Available; + RTE_Available_Call := Save_RTE_Available_Call; + RTE_Is_Available := Save_RTE_Is_Available; + return Result; + + exception + when RE_Not_Available => + RTE_Available_Call := Save_RTE_Available_Call; + RTE_Is_Available := Save_RTE_Is_Available; + return False; + end RTE_Available; + + -------------------------- + -- RTE_Record_Component -- + -------------------------- + + function RTE_Record_Component (E : RE_Id) return Entity_Id is + U_Id : constant RTU_Id := RE_Unit_Table (E); + U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id); + E1 : Entity_Id; + Ename : Name_Id; + Found_E : Entity_Id; + Lib_Unit : Node_Id; + Pkg_Ent : Entity_Id; + + -- The following flag is used to disable front-end inlining when + -- RTE_Record_Component is invoked. This prevents the analysis of other + -- runtime bodies when a particular spec is loaded through Rtsfind. This + -- is both efficient, and it prevents spurious visibility conflicts + -- between use-visible user entities, and entities in run-time packages. + + Save_Front_End_Inlining : Boolean; + + begin + -- Note: Contrary to subprogram RTE, there is no need to do any special + -- management with package system.ads because it has no record type + -- declarations. + + Save_Front_End_Inlining := Front_End_Inlining; + Front_End_Inlining := False; + + -- Load unit if unit not previously loaded + + if not Present (U.Entity) then + Load_RTU (U_Id, Id => E); + end if; + + Lib_Unit := Unit (Cunit (U.Unum)); + + pragma Assert (Nkind (Lib_Unit) = N_Package_Declaration); + Ename := RE_Chars (E); + + -- Search the entity in the components of record type declarations + -- found in the package entity chain. + + Found_E := Empty; + Pkg_Ent := First_Entity (U.Entity); + Search : while Present (Pkg_Ent) loop + if Is_Record_Type (Pkg_Ent) then + E1 := First_Entity (Pkg_Ent); + while Present (E1) loop + if Ename = Chars (E1) then + pragma Assert (not Present (Found_E)); + Found_E := E1; + end if; + + Next_Entity (E1); + end loop; + end if; + + Next_Entity (Pkg_Ent); + end loop Search; + + -- If we didn't find the entity we want, something is wrong. The + -- appropriate action will be taken by Check_CRT when we exit. + + Maybe_Add_With (U); + + Front_End_Inlining := Save_Front_End_Inlining; + return Check_CRT (E, Found_E); + end RTE_Record_Component; + + ------------------------------------ + -- RTE_Record_Component_Available -- + ------------------------------------ + + function RTE_Record_Component_Available (E : RE_Id) return Boolean is + Dummy : Entity_Id; + pragma Warnings (Off, Dummy); + + Result : Boolean; + + Save_RTE_Available_Call : constant Boolean := RTE_Available_Call; + Save_RTE_Is_Available : constant Boolean := RTE_Is_Available; + -- These are saved recursively because the call to load a unit + -- caused by an upper level call may perform a recursive call + -- to this routine during analysis of the corresponding unit. + + begin + RTE_Available_Call := True; + RTE_Is_Available := True; + Dummy := RTE_Record_Component (E); + Result := RTE_Is_Available; + RTE_Available_Call := Save_RTE_Available_Call; + RTE_Is_Available := Save_RTE_Is_Available; + return Result; + + exception + when RE_Not_Available => + RTE_Available_Call := Save_RTE_Available_Call; + RTE_Is_Available := Save_RTE_Is_Available; + return False; + end RTE_Record_Component_Available; + + ------------------- + -- RTE_Error_Msg -- + ------------------- + + procedure RTE_Error_Msg (Msg : String) is + begin + if RTE_Available_Call then + RTE_Is_Available := False; + else + Error_Msg_N (Msg, Current_Error_Node); + + -- Bump count of violations if we are in configurable run-time + -- mode and this is not a continuation message. + + if Configurable_Run_Time_Mode and then Msg (Msg'First) /= '\' then + Configurable_Run_Time_Violations := + Configurable_Run_Time_Violations + 1; + end if; + end if; + end RTE_Error_Msg; + + ---------------- + -- RTU_Entity -- + ---------------- + + function RTU_Entity (U : RTU_Id) return Entity_Id is + begin + return RT_Unit_Table (U).Entity; + end RTU_Entity; + + ---------------- + -- RTU_Loaded -- + ---------------- + + function RTU_Loaded (U : RTU_Id) return Boolean is + begin + return Present (RT_Unit_Table (U).Entity); + end RTU_Loaded; + + -------------------- + -- Set_RTU_Loaded -- + -------------------- + + procedure Set_RTU_Loaded (N : Node_Id) is + Loc : constant Source_Ptr := Sloc (N); + Unum : constant Unit_Number_Type := Get_Source_Unit (Loc); + Uname : constant Unit_Name_Type := Unit_Name (Unum); + E : constant Entity_Id := + Defining_Entity (Unit (Cunit (Unum))); + begin + pragma Assert (Is_Predefined_File_Name (Unit_File_Name (Unum))); + + -- Loop through entries in RTU table looking for matching entry + + for U_Id in RTU_Id'Range loop + + -- Here we have a match + + if Get_Unit_Name (U_Id) = Uname then + declare + U : RT_Unit_Table_Record renames RT_Unit_Table (U_Id); + -- The RT_Unit_Table entry that may need updating + + begin + -- If entry is not set, set it now, and indicate that it was + -- loaded through an explicit context clause. + + if No (U.Entity) then + U := (Entity => E, + Uname => Get_Unit_Name (U_Id), + Unum => Unum, + First_Implicit_With => Empty); + end if; + + return; + end; + end if; + end loop; + end Set_RTU_Loaded; + + -------------------- + -- Text_IO_Kludge -- + -------------------- + + procedure Text_IO_Kludge (Nam : Node_Id) is + Chrs : Name_Id; + + type Name_Map_Type is array (Text_IO_Package_Name) of RTU_Id; + + Name_Map : constant Name_Map_Type := Name_Map_Type'( + Name_Decimal_IO => Ada_Text_IO_Decimal_IO, + Name_Enumeration_IO => Ada_Text_IO_Enumeration_IO, + Name_Fixed_IO => Ada_Text_IO_Fixed_IO, + Name_Float_IO => Ada_Text_IO_Float_IO, + Name_Integer_IO => Ada_Text_IO_Integer_IO, + Name_Modular_IO => Ada_Text_IO_Modular_IO); + + Wide_Name_Map : constant Name_Map_Type := Name_Map_Type'( + Name_Decimal_IO => Ada_Wide_Text_IO_Decimal_IO, + Name_Enumeration_IO => Ada_Wide_Text_IO_Enumeration_IO, + Name_Fixed_IO => Ada_Wide_Text_IO_Fixed_IO, + Name_Float_IO => Ada_Wide_Text_IO_Float_IO, + Name_Integer_IO => Ada_Wide_Text_IO_Integer_IO, + Name_Modular_IO => Ada_Wide_Text_IO_Modular_IO); + + Wide_Wide_Name_Map : constant Name_Map_Type := Name_Map_Type'( + Name_Decimal_IO => Ada_Wide_Wide_Text_IO_Decimal_IO, + Name_Enumeration_IO => Ada_Wide_Wide_Text_IO_Enumeration_IO, + Name_Fixed_IO => Ada_Wide_Wide_Text_IO_Fixed_IO, + Name_Float_IO => Ada_Wide_Wide_Text_IO_Float_IO, + Name_Integer_IO => Ada_Wide_Wide_Text_IO_Integer_IO, + Name_Modular_IO => Ada_Wide_Wide_Text_IO_Modular_IO); + + To_Load : RTU_Id; + -- Unit to be loaded, from one of the above maps + + begin + -- Nothing to do if name is not an identifier or a selected component + -- whose selector_name is an identifier. + + if Nkind (Nam) = N_Identifier then + Chrs := Chars (Nam); + + elsif Nkind (Nam) = N_Selected_Component + and then Nkind (Selector_Name (Nam)) = N_Identifier + then + Chrs := Chars (Selector_Name (Nam)); + + else + return; + end if; + + -- Nothing to do if name is not one of the Text_IO subpackages + -- Otherwise look through loaded units, and if we find Text_IO + -- or [Wide_]Wide_Text_IO already loaded, then load the proper child. + + if Chrs in Text_IO_Package_Name then + for U in Main_Unit .. Last_Unit loop + Get_Name_String (Unit_File_Name (U)); + + if Name_Len = 12 then + + -- Here is where we do the loads if we find one of the units + -- Ada.Text_IO or Ada.[Wide_]Wide_Text_IO. An interesting + -- detail is that these units may already be used (i.e. their + -- In_Use flags may be set). Normally when the In_Use flag is + -- set, the Is_Potentially_Use_Visible flag of all entities in + -- the package is set, but the new entity we are mysteriously + -- adding was not there to have its flag set at the time. So + -- that's why we pass the extra parameter to RTU_Find, to make + -- sure the flag does get set now. Given that those generic + -- packages are in fact child units, we must indicate that + -- they are visible. + + if Name_Buffer (1 .. 12) = "a-textio.ads" then + To_Load := Name_Map (Chrs); + + elsif Name_Buffer (1 .. 12) = "a-witeio.ads" then + To_Load := Wide_Name_Map (Chrs); + + elsif Name_Buffer (1 .. 12) = "a-ztexio.ads" then + To_Load := Wide_Wide_Name_Map (Chrs); + + else + goto Continue; + end if; + + Load_RTU (To_Load, Use_Setting => In_Use (Cunit_Entity (U))); + Set_Is_Visible_Child_Unit (RT_Unit_Table (To_Load).Entity); + + -- Prevent creation of an implicit 'with' from (for example) + -- Ada.Wide_Text_IO.Integer_IO to Ada.Text_IO.Integer_IO, + -- because these could create cycles. First check whether the + -- simple names match ("integer_io" = "integer_io"), and then + -- check whether the parent is indeed one of the + -- [[Wide_]Wide_]Text_IO packages. + + if Chrs = Chars (Cunit_Entity (Current_Sem_Unit)) then + declare + Parent_Name : constant Unit_Name_Type := + Get_Parent_Spec_Name + (Unit_Name (Current_Sem_Unit)); + + begin + if Parent_Name /= No_Unit_Name then + Get_Name_String (Parent_Name); + + declare + P : String renames Name_Buffer (1 .. Name_Len); + begin + if P = "ada.text_io%s" or else + P = "ada.wide_text_io%s" or else + P = "ada.wide_wide_text_io%s" + then + goto Continue; + end if; + end; + end if; + end; + end if; + + -- Add an implicit with clause from the current unit to the + -- [[Wide_]Wide_]Text_IO child (if necessary). + + Maybe_Add_With (RT_Unit_Table (To_Load)); + end if; + + <<Continue>> null; + end loop; + end if; + + exception + -- Generate error message if run-time unit not available + + when RE_Not_Available => + Error_Msg_N ("& not available", Nam); + end Text_IO_Kludge; + +end Rtsfind; |