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------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- I N L I N E -- -- -- -- B o d y -- -- -- -- Copyright (C) 1992-2011, 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 Einfo; use Einfo; with Elists; use Elists; with Errout; use Errout; with Exp_Ch7; use Exp_Ch7; with Exp_Tss; use Exp_Tss; with Fname; use Fname; with Fname.UF; use Fname.UF; with Lib; use Lib; with Namet; use Namet; with Nlists; use Nlists; with Sem_Aux; use Sem_Aux; with Sem_Ch8; use Sem_Ch8; with Sem_Ch10; use Sem_Ch10; with Sem_Ch12; use Sem_Ch12; with Sem_Util; use Sem_Util; with Sinfo; use Sinfo; with Snames; use Snames; with Stand; use Stand; with Uname; use Uname; package body Inline is -------------------- -- Inlined Bodies -- -------------------- -- Inlined functions are actually placed in line by the backend if the -- corresponding bodies are available (i.e. compiled). Whenever we find -- a call to an inlined subprogram, we add the name of the enclosing -- compilation unit to a worklist. After all compilation, and after -- expansion of generic bodies, we traverse the list of pending bodies -- and compile them as well. package Inlined_Bodies is new Table.Table ( Table_Component_Type => Entity_Id, Table_Index_Type => Int, Table_Low_Bound => 0, Table_Initial => Alloc.Inlined_Bodies_Initial, Table_Increment => Alloc.Inlined_Bodies_Increment, Table_Name => "Inlined_Bodies"); ----------------------- -- Inline Processing -- ----------------------- -- For each call to an inlined subprogram, we make entries in a table -- that stores caller and callee, and indicates a prerequisite from -- one to the other. We also record the compilation unit that contains -- the callee. After analyzing the bodies of all such compilation units, -- we produce a list of subprograms in topological order, for use by the -- back-end. If P2 is a prerequisite of P1, then P1 calls P2, and for -- proper inlining the back-end must analyze the body of P2 before that of -- P1. The code below guarantees that the transitive closure of inlined -- subprograms called from the main compilation unit is made available to -- the code generator. Last_Inlined : Entity_Id := Empty; -- For each entry in the table we keep a list of successors in topological -- order, i.e. callers of the current subprogram. type Subp_Index is new Nat; No_Subp : constant Subp_Index := 0; -- The subprogram entities are hashed into the Inlined table Num_Hash_Headers : constant := 512; Hash_Headers : array (Subp_Index range 0 .. Num_Hash_Headers - 1) of Subp_Index; type Succ_Index is new Nat; No_Succ : constant Succ_Index := 0; type Succ_Info is record Subp : Subp_Index; Next : Succ_Index; end record; -- The following table stores list elements for the successor lists. -- These lists cannot be chained directly through entries in the Inlined -- table, because a given subprogram can appear in several such lists. package Successors is new Table.Table ( Table_Component_Type => Succ_Info, Table_Index_Type => Succ_Index, Table_Low_Bound => 1, Table_Initial => Alloc.Successors_Initial, Table_Increment => Alloc.Successors_Increment, Table_Name => "Successors"); type Subp_Info is record Name : Entity_Id := Empty; First_Succ : Succ_Index := No_Succ; Count : Integer := 0; Listed : Boolean := False; Main_Call : Boolean := False; Next : Subp_Index := No_Subp; Next_Nopred : Subp_Index := No_Subp; end record; package Inlined is new Table.Table ( Table_Component_Type => Subp_Info, Table_Index_Type => Subp_Index, Table_Low_Bound => 1, Table_Initial => Alloc.Inlined_Initial, Table_Increment => Alloc.Inlined_Increment, Table_Name => "Inlined"); ----------------------- -- Local Subprograms -- ----------------------- function Get_Code_Unit_Entity (E : Entity_Id) return Entity_Id; pragma Inline (Get_Code_Unit_Entity); -- Return the entity node for the unit containing E function Scope_In_Main_Unit (Scop : Entity_Id) return Boolean; -- Return True if Scop is in the main unit or its spec procedure Add_Call (Called : Entity_Id; Caller : Entity_Id := Empty); -- Make two entries in Inlined table, for an inlined subprogram being -- called, and for the inlined subprogram that contains the call. If -- the call is in the main compilation unit, Caller is Empty. function Add_Subp (E : Entity_Id) return Subp_Index; -- Make entry in Inlined table for subprogram E, or return table index -- that already holds E. function Has_Initialized_Type (E : Entity_Id) return Boolean; -- If a candidate for inlining contains type declarations for types with -- non-trivial initialization procedures, they are not worth inlining. function Is_Nested (E : Entity_Id) return Boolean; -- If the function is nested inside some other function, it will -- always be compiled if that function is, so don't add it to the -- inline list. We cannot compile a nested function outside the -- scope of the containing function anyway. This is also the case if -- the function is defined in a task body or within an entry (for -- example, an initialization procedure). procedure Add_Inlined_Subprogram (Index : Subp_Index); -- Add subprogram to Inlined List once all of its predecessors have been -- placed on the list. Decrement the count of all its successors, and -- add them to list (recursively) if count drops to zero. ------------------------------ -- Deferred Cleanup Actions -- ------------------------------ -- The cleanup actions for scopes that contain instantiations is delayed -- until after expansion of those instantiations, because they may -- contain finalizable objects or tasks that affect the cleanup code. -- A scope that contains instantiations only needs to be finalized once, -- even if it contains more than one instance. We keep a list of scopes -- that must still be finalized, and call cleanup_actions after all the -- instantiations have been completed. To_Clean : Elist_Id; procedure Add_Scope_To_Clean (Inst : Entity_Id); -- Build set of scopes on which cleanup actions must be performed procedure Cleanup_Scopes; -- Complete cleanup actions on scopes that need it -------------- -- Add_Call -- -------------- procedure Add_Call (Called : Entity_Id; Caller : Entity_Id := Empty) is P1 : constant Subp_Index := Add_Subp (Called); P2 : Subp_Index; J : Succ_Index; begin if Present (Caller) then P2 := Add_Subp (Caller); -- Add P2 to the list of successors of P1, if not already there. -- Note that P2 may contain more than one call to P1, and only -- one needs to be recorded. J := Inlined.Table (P1).First_Succ; while J /= No_Succ loop if Successors.Table (J).Subp = P2 then return; end if; J := Successors.Table (J).Next; end loop; -- On exit, make a successor entry for P2 Successors.Increment_Last; Successors.Table (Successors.Last).Subp := P2; Successors.Table (Successors.Last).Next := Inlined.Table (P1).First_Succ; Inlined.Table (P1).First_Succ := Successors.Last; Inlined.Table (P2).Count := Inlined.Table (P2).Count + 1; else Inlined.Table (P1).Main_Call := True; end if; end Add_Call; ---------------------- -- Add_Inlined_Body -- ---------------------- procedure Add_Inlined_Body (E : Entity_Id) is function Must_Inline return Boolean; -- Inlining is only done if the call statement N is in the main unit, -- or within the body of another inlined subprogram. ----------------- -- Must_Inline -- ----------------- function Must_Inline return Boolean is Scop : Entity_Id; Comp : Node_Id; begin -- Check if call is in main unit Scop := Current_Scope; -- Do not try to inline if scope is standard. This could happen, for -- example, for a call to Add_Global_Declaration, and it causes -- trouble to try to inline at this level. if Scop = Standard_Standard then return False; end if; -- Otherwise lookup scope stack to outer scope while Scope (Scop) /= Standard_Standard and then not Is_Child_Unit (Scop) loop Scop := Scope (Scop); end loop; Comp := Parent (Scop); while Nkind (Comp) /= N_Compilation_Unit loop Comp := Parent (Comp); end loop; if Comp = Cunit (Main_Unit) or else Comp = Library_Unit (Cunit (Main_Unit)) then Add_Call (E); return True; end if; -- Call is not in main unit. See if it's in some inlined subprogram Scop := Current_Scope; while Scope (Scop) /= Standard_Standard and then not Is_Child_Unit (Scop) loop if Is_Overloadable (Scop) and then Is_Inlined (Scop) then Add_Call (E, Scop); return True; end if; Scop := Scope (Scop); end loop; return False; end Must_Inline; -- Start of processing for Add_Inlined_Body begin -- Find unit containing E, and add to list of inlined bodies if needed. -- If the body is already present, no need to load any other unit. This -- is the case for an initialization procedure, which appears in the -- package declaration that contains the type. It is also the case if -- the body has already been analyzed. Finally, if the unit enclosing -- E is an instance, the instance body will be analyzed in any case, -- and there is no need to add the enclosing unit (whose body might not -- be available). -- Library-level functions must be handled specially, because there is -- no enclosing package to retrieve. In this case, it is the body of -- the function that will have to be loaded. if not Is_Abstract_Subprogram (E) and then not Is_Nested (E) and then Convention (E) /= Convention_Protected and then Must_Inline then declare Pack : constant Entity_Id := Get_Code_Unit_Entity (E); begin if Pack = E then -- Library-level inlined function. Add function itself to -- list of needed units. Set_Is_Called (E); Inlined_Bodies.Increment_Last; Inlined_Bodies.Table (Inlined_Bodies.Last) := E; elsif Ekind (Pack) = E_Package then Set_Is_Called (E); if Is_Generic_Instance (Pack) then null; -- Do not inline the package if the subprogram is an init proc -- or other internally generated subprogram, because in that -- case the subprogram body appears in the same unit that -- declares the type, and that body is visible to the back end. elsif not Is_Inlined (Pack) and then Comes_From_Source (E) then Set_Is_Inlined (Pack); Inlined_Bodies.Increment_Last; Inlined_Bodies.Table (Inlined_Bodies.Last) := Pack; end if; end if; end; end if; end Add_Inlined_Body; ---------------------------- -- Add_Inlined_Subprogram -- ---------------------------- procedure Add_Inlined_Subprogram (Index : Subp_Index) is E : constant Entity_Id := Inlined.Table (Index).Name; Pack : constant Entity_Id := Get_Code_Unit_Entity (E); Succ : Succ_Index; Subp : Subp_Index; function Back_End_Cannot_Inline (Subp : Entity_Id) return Boolean; -- There are various conditions under which back-end inlining cannot -- be done reliably: -- -- a) If a body has handlers, it must not be inlined, because this -- may violate program semantics, and because in zero-cost exception -- mode it will lead to undefined symbols at link time. -- -- b) If a body contains inlined function instances, it cannot be -- inlined under ZCX because the numeric suffix generated by gigi -- will be different in the body and the place of the inlined call. -- -- This procedure must be carefully coordinated with the back end. ---------------------------- -- Back_End_Cannot_Inline -- ---------------------------- function Back_End_Cannot_Inline (Subp : Entity_Id) return Boolean is Decl : constant Node_Id := Unit_Declaration_Node (Subp); Body_Ent : Entity_Id; Ent : Entity_Id; begin if Nkind (Decl) = N_Subprogram_Declaration and then Present (Corresponding_Body (Decl)) then Body_Ent := Corresponding_Body (Decl); else return False; end if; -- If subprogram is marked Inline_Always, inlining is mandatory if Has_Pragma_Inline_Always (Subp) then return False; end if; if Present (Exception_Handlers (Handled_Statement_Sequence (Unit_Declaration_Node (Corresponding_Body (Decl))))) then return True; end if; Ent := First_Entity (Body_Ent); while Present (Ent) loop if Is_Subprogram (Ent) and then Is_Generic_Instance (Ent) then return True; end if; Next_Entity (Ent); end loop; return False; end Back_End_Cannot_Inline; -- Start of processing for Add_Inlined_Subprogram begin -- If the subprogram is to be inlined, and if its unit is known to be -- inlined or is an instance whose body will be analyzed anyway or the -- subprogram has been generated by the compiler, and if it is declared -- at the library level not in the main unit, and if it can be inlined -- by the back-end, then insert it in the list of inlined subprograms. if Is_Inlined (E) and then (Is_Inlined (Pack) or else Is_Generic_Instance (Pack) or else Is_Internal (E)) and then not Scope_In_Main_Unit (E) and then not Is_Nested (E) and then not Has_Initialized_Type (E) then if Back_End_Cannot_Inline (E) then Set_Is_Inlined (E, False); else if No (Last_Inlined) then Set_First_Inlined_Subprogram (Cunit (Main_Unit), E); else Set_Next_Inlined_Subprogram (Last_Inlined, E); end if; Last_Inlined := E; end if; end if; Inlined.Table (Index).Listed := True; -- Now add to the list those callers of the current subprogram that -- are themselves called. They may appear on the graph as callers -- of the current one, even if they are themselves not called, and -- there is no point in including them in the list for the backend. -- Furthermore, they might not even be public, in which case the -- back-end cannot handle them at all. Succ := Inlined.Table (Index).First_Succ; while Succ /= No_Succ loop Subp := Successors.Table (Succ).Subp; Inlined.Table (Subp).Count := Inlined.Table (Subp).Count - 1; if Inlined.Table (Subp).Count = 0 and then Is_Called (Inlined.Table (Subp).Name) then Add_Inlined_Subprogram (Subp); end if; Succ := Successors.Table (Succ).Next; end loop; end Add_Inlined_Subprogram; ------------------------ -- Add_Scope_To_Clean -- ------------------------ procedure Add_Scope_To_Clean (Inst : Entity_Id) is Scop : constant Entity_Id := Enclosing_Dynamic_Scope (Inst); Elmt : Elmt_Id; begin -- If the instance appears in a library-level package declaration, -- all finalization is global, and nothing needs doing here. if Scop = Standard_Standard then return; end if; -- If the instance is within a generic unit, no finalization code -- can be generated. Note that at this point all bodies have been -- analyzed, and the scope stack itself is not present, and the flag -- Inside_A_Generic is not set. declare S : Entity_Id; begin S := Scope (Inst); while Present (S) and then S /= Standard_Standard loop if Is_Generic_Unit (S) then return; end if; S := Scope (S); end loop; end; Elmt := First_Elmt (To_Clean); while Present (Elmt) loop if Node (Elmt) = Scop then return; end if; Elmt := Next_Elmt (Elmt); end loop; Append_Elmt (Scop, To_Clean); end Add_Scope_To_Clean; -------------- -- Add_Subp -- -------------- function Add_Subp (E : Entity_Id) return Subp_Index is Index : Subp_Index := Subp_Index (E) mod Num_Hash_Headers; J : Subp_Index; procedure New_Entry; -- Initialize entry in Inlined table procedure New_Entry is begin Inlined.Increment_Last; Inlined.Table (Inlined.Last).Name := E; Inlined.Table (Inlined.Last).First_Succ := No_Succ; Inlined.Table (Inlined.Last).Count := 0; Inlined.Table (Inlined.Last).Listed := False; Inlined.Table (Inlined.Last).Main_Call := False; Inlined.Table (Inlined.Last).Next := No_Subp; Inlined.Table (Inlined.Last).Next_Nopred := No_Subp; end New_Entry; -- Start of processing for Add_Subp begin if Hash_Headers (Index) = No_Subp then New_Entry; Hash_Headers (Index) := Inlined.Last; return Inlined.Last; else J := Hash_Headers (Index); while J /= No_Subp loop if Inlined.Table (J).Name = E then return J; else Index := J; J := Inlined.Table (J).Next; end if; end loop; -- On exit, subprogram was not found. Enter in table. Index is -- the current last entry on the hash chain. New_Entry; Inlined.Table (Index).Next := Inlined.Last; return Inlined.Last; end if; end Add_Subp; ---------------------------- -- Analyze_Inlined_Bodies -- ---------------------------- procedure Analyze_Inlined_Bodies is Comp_Unit : Node_Id; J : Int; Pack : Entity_Id; S : Succ_Index; function Is_Ancestor_Of_Main (U_Name : Entity_Id; Nam : Node_Id) return Boolean; -- Determine whether the unit whose body is loaded is an ancestor of -- the main unit, and has a with_clause on it. The body is not -- analyzed yet, so the check is purely lexical: the name of the with -- clause is a selected component, and names of ancestors must match. ------------------------- -- Is_Ancestor_Of_Main -- ------------------------- function Is_Ancestor_Of_Main (U_Name : Entity_Id; Nam : Node_Id) return Boolean is Pref : Node_Id; begin if Nkind (Nam) /= N_Selected_Component then return False; else if Chars (Selector_Name (Nam)) /= Chars (Cunit_Entity (Main_Unit)) then return False; end if; Pref := Prefix (Nam); if Nkind (Pref) = N_Identifier then -- Par is an ancestor of Par.Child. return Chars (Pref) = Chars (U_Name); elsif Nkind (Pref) = N_Selected_Component and then Chars (Selector_Name (Pref)) = Chars (U_Name) then -- Par.Child is an ancestor of Par.Child.Grand. return True; -- should check that ancestor match else -- A is an ancestor of A.B.C if it is an ancestor of A.B return Is_Ancestor_Of_Main (U_Name, Pref); end if; end if; end Is_Ancestor_Of_Main; -- Start of processing for Analyze_Inlined_Bodies begin Analyzing_Inlined_Bodies := False; if Serious_Errors_Detected = 0 then Push_Scope (Standard_Standard); J := 0; while J <= Inlined_Bodies.Last and then Serious_Errors_Detected = 0 loop Pack := Inlined_Bodies.Table (J); while Present (Pack) and then Scope (Pack) /= Standard_Standard and then not Is_Child_Unit (Pack) loop Pack := Scope (Pack); end loop; Comp_Unit := Parent (Pack); while Present (Comp_Unit) and then Nkind (Comp_Unit) /= N_Compilation_Unit loop Comp_Unit := Parent (Comp_Unit); end loop; -- Load the body, unless it the main unit, or is an instance whose -- body has already been analyzed. if Present (Comp_Unit) and then Comp_Unit /= Cunit (Main_Unit) and then Body_Required (Comp_Unit) and then (Nkind (Unit (Comp_Unit)) /= N_Package_Declaration or else No (Corresponding_Body (Unit (Comp_Unit)))) then declare Bname : constant Unit_Name_Type := Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit))); OK : Boolean; begin if not Is_Loaded (Bname) then Style_Check := False; Load_Needed_Body (Comp_Unit, OK, Do_Analyze => False); if not OK then -- Warn that a body was not available for inlining -- by the back-end. Error_Msg_Unit_1 := Bname; Error_Msg_N ("one or more inlined subprograms accessed in $!?", Comp_Unit); Error_Msg_File_1 := Get_File_Name (Bname, Subunit => False); Error_Msg_N ("\but file{ was not found!?", Comp_Unit); else -- If the package to be inlined is an ancestor unit of -- the main unit, and it has a semantic dependence on -- it, the inlining cannot take place to prevent an -- elaboration circularity. The desired body is not -- analyzed yet, to prevent the completion of Taft -- amendment types that would lead to elaboration -- circularities in gigi. declare U_Id : constant Entity_Id := Defining_Entity (Unit (Comp_Unit)); Body_Unit : constant Node_Id := Library_Unit (Comp_Unit); Item : Node_Id; begin Item := First (Context_Items (Body_Unit)); while Present (Item) loop if Nkind (Item) = N_With_Clause and then Is_Ancestor_Of_Main (U_Id, Name (Item)) then Set_Is_Inlined (U_Id, False); exit; end if; Next (Item); end loop; -- If no suspicious with_clauses, analyze the body. if Is_Inlined (U_Id) then Semantics (Body_Unit); end if; end; end if; end if; end; end if; J := J + 1; end loop; -- The analysis of required bodies may have produced additional -- generic instantiations. To obtain further inlining, we perform -- another round of generic body instantiations. Establishing a -- fully recursive loop between inlining and generic instantiations -- is unlikely to yield more than this one additional pass. Instantiate_Bodies; -- The list of inlined subprograms is an overestimate, because it -- includes inlined functions called from functions that are compiled -- as part of an inlined package, but are not themselves called. An -- accurate computation of just those subprograms that are needed -- requires that we perform a transitive closure over the call graph, -- starting from calls in the main program. Here we do one step of -- the inverse transitive closure, and reset the Is_Called flag on -- subprograms all of whose callers are not. for Index in Inlined.First .. Inlined.Last loop S := Inlined.Table (Index).First_Succ; if S /= No_Succ and then not Inlined.Table (Index).Main_Call then Set_Is_Called (Inlined.Table (Index).Name, False); while S /= No_Succ loop if Is_Called (Inlined.Table (Successors.Table (S).Subp).Name) or else Inlined.Table (Successors.Table (S).Subp).Main_Call then Set_Is_Called (Inlined.Table (Index).Name); exit; end if; S := Successors.Table (S).Next; end loop; end if; end loop; -- Now that the units are compiled, chain the subprograms within -- that are called and inlined. Produce list of inlined subprograms -- sorted in topological order. Start with all subprograms that -- have no prerequisites, i.e. inlined subprograms that do not call -- other inlined subprograms. for Index in Inlined.First .. Inlined.Last loop if Is_Called (Inlined.Table (Index).Name) and then Inlined.Table (Index).Count = 0 and then not Inlined.Table (Index).Listed then Add_Inlined_Subprogram (Index); end if; end loop; -- Because Add_Inlined_Subprogram treats recursively nodes that have -- no prerequisites left, at the end of the loop all subprograms -- must have been listed. If there are any unlisted subprograms -- left, there must be some recursive chains that cannot be inlined. for Index in Inlined.First .. Inlined.Last loop if Is_Called (Inlined.Table (Index).Name) and then Inlined.Table (Index).Count /= 0 and then not Is_Predefined_File_Name (Unit_File_Name (Get_Source_Unit (Inlined.Table (Index).Name))) then Error_Msg_N ("& cannot be inlined?", Inlined.Table (Index).Name); -- A warning on the first one might be sufficient ??? end if; end loop; Pop_Scope; end if; end Analyze_Inlined_Bodies; ----------------------------- -- Check_Body_For_Inlining -- ----------------------------- procedure Check_Body_For_Inlining (N : Node_Id; P : Entity_Id) is Bname : Unit_Name_Type; E : Entity_Id; OK : Boolean; begin if Is_Compilation_Unit (P) and then not Is_Generic_Instance (P) then Bname := Get_Body_Name (Get_Unit_Name (Unit (N))); E := First_Entity (P); while Present (E) loop if Has_Pragma_Inline_Always (E) or else (Front_End_Inlining and then Has_Pragma_Inline (E)) then if not Is_Loaded (Bname) then Load_Needed_Body (N, OK); if OK then -- Check we are not trying to inline a parent whose body -- depends on a child, when we are compiling the body of -- the child. Otherwise we have a potential elaboration -- circularity with inlined subprograms and with -- Taft-Amendment types. declare Comp : Node_Id; -- Body just compiled Child_Spec : Entity_Id; -- Spec of main unit Ent : Entity_Id; -- For iteration With_Clause : Node_Id; -- Context of body. begin if Nkind (Unit (Cunit (Main_Unit))) = N_Package_Body and then Present (Body_Entity (P)) then Child_Spec := Defining_Entity ((Unit (Library_Unit (Cunit (Main_Unit))))); Comp := Parent (Unit_Declaration_Node (Body_Entity (P))); -- Check whether the context of the body just -- compiled includes a child of itself, and that -- child is the spec of the main compilation. With_Clause := First (Context_Items (Comp)); while Present (With_Clause) loop if Nkind (With_Clause) = N_With_Clause and then Scope (Entity (Name (With_Clause))) = P and then Entity (Name (With_Clause)) = Child_Spec then Error_Msg_Node_2 := Child_Spec; Error_Msg_NE ("body of & depends on child unit&?", With_Clause, P); Error_Msg_N ("\subprograms in body cannot be inlined?", With_Clause); -- Disable further inlining from this unit, -- and keep Taft-amendment types incomplete. Ent := First_Entity (P); while Present (Ent) loop if Is_Type (Ent) and then Has_Completion_In_Body (Ent) then Set_Full_View (Ent, Empty); elsif Is_Subprogram (Ent) then Set_Is_Inlined (Ent, False); end if; Next_Entity (Ent); end loop; return; end if; Next (With_Clause); end loop; end if; end; elsif Ineffective_Inline_Warnings then Error_Msg_Unit_1 := Bname; Error_Msg_N ("unable to inline subprograms defined in $?", P); Error_Msg_N ("\body not found?", P); return; end if; end if; return; end if; Next_Entity (E); end loop; end if; end Check_Body_For_Inlining; -------------------- -- Cleanup_Scopes -- -------------------- procedure Cleanup_Scopes is Elmt : Elmt_Id; Decl : Node_Id; Scop : Entity_Id; begin Elmt := First_Elmt (To_Clean); while Present (Elmt) loop Scop := Node (Elmt); if Ekind (Scop) = E_Entry then Scop := Protected_Body_Subprogram (Scop); elsif Is_Subprogram (Scop) and then Is_Protected_Type (Scope (Scop)) and then Present (Protected_Body_Subprogram (Scop)) then -- If a protected operation contains an instance, its -- cleanup operations have been delayed, and the subprogram -- has been rewritten in the expansion of the enclosing -- protected body. It is the corresponding subprogram that -- may require the cleanup operations, so propagate the -- information that triggers cleanup activity. Set_Uses_Sec_Stack (Protected_Body_Subprogram (Scop), Uses_Sec_Stack (Scop)); Scop := Protected_Body_Subprogram (Scop); end if; if Ekind (Scop) = E_Block then Decl := Parent (Block_Node (Scop)); else Decl := Unit_Declaration_Node (Scop); if Nkind (Decl) = N_Subprogram_Declaration or else Nkind (Decl) = N_Task_Type_Declaration or else Nkind (Decl) = N_Subprogram_Body_Stub then Decl := Unit_Declaration_Node (Corresponding_Body (Decl)); end if; end if; Push_Scope (Scop); Expand_Cleanup_Actions (Decl); End_Scope; Elmt := Next_Elmt (Elmt); end loop; end Cleanup_Scopes; -------------------------- -- Get_Code_Unit_Entity -- -------------------------- function Get_Code_Unit_Entity (E : Entity_Id) return Entity_Id is begin return Cunit_Entity (Get_Code_Unit (E)); end Get_Code_Unit_Entity; -------------------------- -- Has_Initialized_Type -- -------------------------- function Has_Initialized_Type (E : Entity_Id) return Boolean is E_Body : constant Node_Id := Get_Subprogram_Body (E); Decl : Node_Id; begin if No (E_Body) then -- imported subprogram return False; else Decl := First (Declarations (E_Body)); while Present (Decl) loop if Nkind (Decl) = N_Full_Type_Declaration and then Present (Init_Proc (Defining_Identifier (Decl))) then return True; end if; Next (Decl); end loop; end if; return False; end Has_Initialized_Type; ---------------- -- Initialize -- ---------------- procedure Initialize is begin Analyzing_Inlined_Bodies := False; Pending_Descriptor.Init; Pending_Instantiations.Init; Inlined_Bodies.Init; Successors.Init; Inlined.Init; for J in Hash_Headers'Range loop Hash_Headers (J) := No_Subp; end loop; end Initialize; ------------------------ -- Instantiate_Bodies -- ------------------------ -- Generic bodies contain all the non-local references, so an -- instantiation does not need any more context than Standard -- itself, even if the instantiation appears in an inner scope. -- Generic associations have verified that the contract model is -- satisfied, so that any error that may occur in the analysis of -- the body is an internal error. procedure Instantiate_Bodies is J : Int; Info : Pending_Body_Info; begin if Serious_Errors_Detected = 0 then Expander_Active := (Operating_Mode = Opt.Generate_Code); Push_Scope (Standard_Standard); To_Clean := New_Elmt_List; if Is_Generic_Unit (Cunit_Entity (Main_Unit)) then Start_Generic; end if; -- A body instantiation may generate additional instantiations, so -- the following loop must scan to the end of a possibly expanding -- set (that's why we can't simply use a FOR loop here). J := 0; while J <= Pending_Instantiations.Last and then Serious_Errors_Detected = 0 loop Info := Pending_Instantiations.Table (J); -- If the instantiation node is absent, it has been removed -- as part of unreachable code. if No (Info.Inst_Node) then null; elsif Nkind (Info.Act_Decl) = N_Package_Declaration then Instantiate_Package_Body (Info); Add_Scope_To_Clean (Defining_Entity (Info.Act_Decl)); else Instantiate_Subprogram_Body (Info); end if; J := J + 1; end loop; -- Reset the table of instantiations. Additional instantiations -- may be added through inlining, when additional bodies are -- analyzed. Pending_Instantiations.Init; -- We can now complete the cleanup actions of scopes that contain -- pending instantiations (skipped for generic units, since we -- never need any cleanups in generic units). -- pending instantiations. if Expander_Active and then not Is_Generic_Unit (Main_Unit_Entity) then Cleanup_Scopes; elsif Is_Generic_Unit (Cunit_Entity (Main_Unit)) then End_Generic; end if; Pop_Scope; end if; end Instantiate_Bodies; --------------- -- Is_Nested -- --------------- function Is_Nested (E : Entity_Id) return Boolean is Scop : Entity_Id; begin Scop := Scope (E); while Scop /= Standard_Standard loop if Ekind (Scop) in Subprogram_Kind then return True; elsif Ekind (Scop) = E_Task_Type or else Ekind (Scop) = E_Entry or else Ekind (Scop) = E_Entry_Family then return True; end if; Scop := Scope (Scop); end loop; return False; end Is_Nested; ---------- -- Lock -- ---------- procedure Lock is begin Pending_Instantiations.Locked := True; Inlined_Bodies.Locked := True; Successors.Locked := True; Inlined.Locked := True; Pending_Instantiations.Release; Inlined_Bodies.Release; Successors.Release; Inlined.Release; end Lock; -------------------------- -- Remove_Dead_Instance -- -------------------------- procedure Remove_Dead_Instance (N : Node_Id) is J : Int; begin J := 0; while J <= Pending_Instantiations.Last loop if Pending_Instantiations.Table (J).Inst_Node = N then Pending_Instantiations.Table (J).Inst_Node := Empty; return; end if; J := J + 1; end loop; end Remove_Dead_Instance; ------------------------ -- Scope_In_Main_Unit -- ------------------------ function Scope_In_Main_Unit (Scop : Entity_Id) return Boolean is Comp : constant Node_Id := Cunit (Get_Code_Unit (Scop)); begin -- Check whether the scope of the subprogram to inline is within the -- main unit or within its spec. In either case there are no additional -- bodies to process. If the subprogram appears in a parent of the -- current unit, the check on whether inlining is possible is done in -- Analyze_Inlined_Bodies. return Comp = Cunit (Main_Unit) or else Comp = Library_Unit (Cunit (Main_Unit)); end Scope_In_Main_Unit; end Inline;
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