------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- E X P _ A G G R -- -- -- -- B o d y -- -- -- -- Copyright (C) 1992-2005 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 2, 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 COPYING. If not, write -- -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, USA. -- -- -- -- 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 Checks; use Checks; with Debug; use Debug; with Einfo; use Einfo; with Elists; use Elists; with Expander; use Expander; with Exp_Util; use Exp_Util; with Exp_Ch3; use Exp_Ch3; with Exp_Ch7; use Exp_Ch7; with Exp_Ch9; use Exp_Ch9; with Exp_Tss; use Exp_Tss; with Freeze; use Freeze; with Hostparm; use Hostparm; with Itypes; use Itypes; with Lib; use Lib; with Nmake; use Nmake; with Nlists; use Nlists; with Restrict; use Restrict; with Rident; use Rident; with Rtsfind; use Rtsfind; with Ttypes; use Ttypes; with Sem; use Sem; with Sem_Ch3; use Sem_Ch3; with Sem_Eval; use Sem_Eval; with Sem_Res; use Sem_Res; with Sem_Util; use Sem_Util; with Sinfo; use Sinfo; with Snames; use Snames; with Stand; use Stand; with Tbuild; use Tbuild; with Uintp; use Uintp; package body Exp_Aggr is type Case_Bounds is record Choice_Lo : Node_Id; Choice_Hi : Node_Id; Choice_Node : Node_Id; end record; type Case_Table_Type is array (Nat range <>) of Case_Bounds; -- Table type used by Check_Case_Choices procedure function Must_Slide (Obj_Type : Entity_Id; Typ : Entity_Id) return Boolean; -- A static array aggregate in an object declaration can in most cases be -- expanded in place. The one exception is when the aggregate is given -- with component associations that specify different bounds from those of -- the type definition in the object declaration. In this pathological -- case the aggregate must slide, and we must introduce an intermediate -- temporary to hold it. -- -- The same holds in an assignment to one-dimensional array of arrays, -- when a component may be given with bounds that differ from those of the -- component type. procedure Sort_Case_Table (Case_Table : in out Case_Table_Type); -- Sort the Case Table using the Lower Bound of each Choice as the key. -- A simple insertion sort is used since the number of choices in a case -- statement of variant part will usually be small and probably in near -- sorted order. function Has_Default_Init_Comps (N : Node_Id) return Boolean; -- N is an aggregate (record or array). Checks the presence of default -- initialization (<>) in any component (Ada 2005: AI-287) ------------------------------------------------------ -- Local subprograms for Record Aggregate Expansion -- ------------------------------------------------------ procedure Expand_Record_Aggregate (N : Node_Id; Orig_Tag : Node_Id := Empty; Parent_Expr : Node_Id := Empty); -- This is the top level procedure for record aggregate expansion. -- Expansion for record aggregates needs expand aggregates for tagged -- record types. Specifically Expand_Record_Aggregate adds the Tag -- field in front of the Component_Association list that was created -- during resolution by Resolve_Record_Aggregate. -- -- N is the record aggregate node. -- Orig_Tag is the value of the Tag that has to be provided for this -- specific aggregate. It carries the tag corresponding to the type -- of the outermost aggregate during the recursive expansion -- Parent_Expr is the ancestor part of the original extension -- aggregate procedure Convert_To_Assignments (N : Node_Id; Typ : Entity_Id); -- N is an N_Aggregate of a N_Extension_Aggregate. Typ is the type of -- the aggregate. Transform the given aggregate into a sequence of -- assignments component per component. function Build_Record_Aggr_Code (N : Node_Id; Typ : Entity_Id; Target : Node_Id; Flist : Node_Id := Empty; Obj : Entity_Id := Empty; Is_Limited_Ancestor_Expansion : Boolean := False) return List_Id; -- N is an N_Aggregate or a N_Extension_Aggregate. Typ is the type of the -- aggregate. Target is an expression containing the location on which the -- component by component assignments will take place. Returns the list of -- assignments plus all other adjustments needed for tagged and controlled -- types. Flist is an expression representing the finalization list on -- which to attach the controlled components if any. Obj is present in the -- object declaration and dynamic allocation cases, it contains an entity -- that allows to know if the value being created needs to be attached to -- the final list in case of pragma finalize_Storage_Only. -- -- Is_Limited_Ancestor_Expansion indicates that the function has been -- called recursively to expand the limited ancestor to avoid copying it. function Has_Mutable_Components (Typ : Entity_Id) return Boolean; -- Return true if one of the component is of a discriminated type with -- defaults. An aggregate for a type with mutable components must be -- expanded into individual assignments. procedure Initialize_Discriminants (N : Node_Id; Typ : Entity_Id); -- If the type of the aggregate is a type extension with renamed discrimi- -- nants, we must initialize the hidden discriminants of the parent. -- Otherwise, the target object must not be initialized. The discriminants -- are initialized by calling the initialization procedure for the type. -- This is incorrect if the initialization of other components has any -- side effects. We restrict this call to the case where the parent type -- has a variant part, because this is the only case where the hidden -- discriminants are accessed, namely when calling discriminant checking -- functions of the parent type, and when applying a stream attribute to -- an object of the derived type. ----------------------------------------------------- -- Local Subprograms for Array Aggregate Expansion -- ----------------------------------------------------- procedure Convert_Array_Aggr_In_Allocator (Decl : Node_Id; Aggr : Node_Id; Target : Node_Id); -- If the aggregate appears within an allocator and can be expanded in -- place, this routine generates the individual assignments to components -- of the designated object. This is an optimization over the general -- case, where a temporary is first created on the stack and then used to -- construct the allocated object on the heap. procedure Convert_To_Positional (N : Node_Id; Max_Others_Replicate : Nat := 5; Handle_Bit_Packed : Boolean := False); -- If possible, convert named notation to positional notation. This -- conversion is possible only in some static cases. If the conversion is -- possible, then N is rewritten with the analyzed converted aggregate. -- The parameter Max_Others_Replicate controls the maximum number of -- values corresponding to an others choice that will be converted to -- positional notation (the default of 5 is the normal limit, and reflects -- the fact that normally the loop is better than a lot of separate -- assignments). Note that this limit gets overridden in any case if -- either of the restrictions No_Elaboration_Code or No_Implicit_Loops is -- set. The parameter Handle_Bit_Packed is usually set False (since we do -- not expect the back end to handle bit packed arrays, so the normal case -- of conversion is pointless), but in the special case of a call from -- Packed_Array_Aggregate_Handled, we set this parameter to True, since -- these are cases we handle in there. procedure Expand_Array_Aggregate (N : Node_Id); -- This is the top-level routine to perform array aggregate expansion. -- N is the N_Aggregate node to be expanded. function Backend_Processing_Possible (N : Node_Id) return Boolean; -- This function checks if array aggregate N can be processed directly -- by Gigi. If this is the case True is returned. function Build_Array_Aggr_Code (N : Node_Id; Ctype : Entity_Id; Index : Node_Id; Into : Node_Id; Scalar_Comp : Boolean; Indices : List_Id := No_List; Flist : Node_Id := Empty) return List_Id; -- This recursive routine returns a list of statements containing the -- loops and assignments that are needed for the expansion of the array -- aggregate N. -- -- N is the (sub-)aggregate node to be expanded into code. This node -- has been fully analyzed, and its Etype is properly set. -- -- Index is the index node corresponding to the array sub-aggregate N. -- -- Into is the target expression into which we are copying the aggregate. -- Note that this node may not have been analyzed yet, and so the Etype -- field may not be set. -- -- Scalar_Comp is True if the component type of the aggregate is scalar. -- -- Indices is the current list of expressions used to index the -- object we are writing into. -- -- Flist is an expression representing the finalization list on which -- to attach the controlled components if any. function Number_Of_Choices (N : Node_Id) return Nat; -- Returns the number of discrete choices (not including the others choice -- if present) contained in (sub-)aggregate N. function Late_Expansion (N : Node_Id; Typ : Entity_Id; Target : Node_Id; Flist : Node_Id := Empty; Obj : Entity_Id := Empty) return List_Id; -- N is a nested (record or array) aggregate that has been marked with -- 'Delay_Expansion'. Typ is the expected type of the aggregate and Target -- is a (duplicable) expression that will hold the result of the aggregate -- expansion. Flist is the finalization list to be used to attach -- controlled components. 'Obj' when non empty, carries the original -- object being initialized in order to know if it needs to be attached to -- the previous parameter which may not be the case in the case where -- Finalize_Storage_Only is set. Basically this procedure is used to -- implement top-down expansions of nested aggregates. This is necessary -- for avoiding temporaries at each level as well as for propagating the -- right internal finalization list. function Make_OK_Assignment_Statement (Sloc : Source_Ptr; Name : Node_Id; Expression : Node_Id) return Node_Id; -- This is like Make_Assignment_Statement, except that Assignment_OK -- is set in the left operand. All assignments built by this unit -- use this routine. This is needed to deal with assignments to -- initialized constants that are done in place. function Packed_Array_Aggregate_Handled (N : Node_Id) return Boolean; -- Given an array aggregate, this function handles the case of a packed -- array aggregate with all constant values, where the aggregate can be -- evaluated at compile time. If this is possible, then N is rewritten -- to be its proper compile time value with all the components properly -- assembled. The expression is analyzed and resolved and True is -- returned. If this transformation is not possible, N is unchanged -- and False is returned function Safe_Slice_Assignment (N : Node_Id) return Boolean; -- If a slice assignment has an aggregate with a single others_choice, -- the assignment can be done in place even if bounds are not static, -- by converting it into a loop over the discrete range of the slice. --------------------------------- -- Backend_Processing_Possible -- --------------------------------- -- Backend processing by Gigi/gcc is possible only if all the following -- conditions are met: -- 1. N is fully positional -- 2. N is not a bit-packed array aggregate; -- 3. The size of N's array type must be known at compile time. Note -- that this implies that the component size is also known -- 4. The array type of N does not follow the Fortran layout convention -- or if it does it must be 1 dimensional. -- 5. The array component type is tagged, which may necessitate -- reassignment of proper tags. -- 6. The array component type might have unaligned bit components function Backend_Processing_Possible (N : Node_Id) return Boolean is Typ : constant Entity_Id := Etype (N); -- Typ is the correct constrained array subtype of the aggregate function Static_Check (N : Node_Id; Index : Node_Id) return Boolean; -- Recursively checks that N is fully positional, returns true if so ------------------ -- Static_Check -- ------------------ function Static_Check (N : Node_Id; Index : Node_Id) return Boolean is Expr : Node_Id; begin -- Check for component associations if Present (Component_Associations (N)) then return False; end if; -- Recurse to check subaggregates, which may appear in qualified -- expressions. If delayed, the front-end will have to expand. Expr := First (Expressions (N)); while Present (Expr) loop if Is_Delayed_Aggregate (Expr) then return False; end if; if Present (Next_Index (Index)) and then not Static_Check (Expr, Next_Index (Index)) then return False; end if; Next (Expr); end loop; return True; end Static_Check; -- Start of processing for Backend_Processing_Possible begin -- Checks 2 (array must not be bit packed) if Is_Bit_Packed_Array (Typ) then return False; end if; -- Checks 4 (array must not be multi-dimensional Fortran case) if Convention (Typ) = Convention_Fortran and then Number_Dimensions (Typ) > 1 then return False; end if; -- Checks 3 (size of array must be known at compile time) if not Size_Known_At_Compile_Time (Typ) then return False; end if; -- Checks 1 (aggregate must be fully positional) if not Static_Check (N, First_Index (Typ)) then return False; end if; -- Checks 5 (if the component type is tagged, then we may need -- to do tag adjustments; perhaps this should be refined to check for -- any component associations that actually need tag adjustment, -- along the lines of the test that is carried out in -- Has_Delayed_Nested_Aggregate_Or_Tagged_Comps for record aggregates -- with tagged components, but not clear whether it's worthwhile ???; -- in the case of the JVM, object tags are handled implicitly) if Is_Tagged_Type (Component_Type (Typ)) and then not Java_VM then return False; end if; -- Checks 6 (component type must not have bit aligned components) if Type_May_Have_Bit_Aligned_Components (Component_Type (Typ)) then return False; end if; -- Backend processing is possible Set_Compile_Time_Known_Aggregate (N, True); Set_Size_Known_At_Compile_Time (Etype (N), True); return True; end Backend_Processing_Possible; --------------------------- -- Build_Array_Aggr_Code -- --------------------------- -- The code that we generate from a one dimensional aggregate is -- 1. If the sub-aggregate contains discrete choices we -- (a) Sort the discrete choices -- (b) Otherwise for each discrete choice that specifies a range we -- emit a loop. If a range specifies a maximum of three values, or -- we are dealing with an expression we emit a sequence of -- assignments instead of a loop. -- (c) Generate the remaining loops to cover the others choice if any -- 2. If the aggregate contains positional elements we -- (a) translate the positional elements in a series of assignments -- (b) Generate a final loop to cover the others choice if any. -- Note that this final loop has to be a while loop since the case -- L : Integer := Integer'Last; -- H : Integer := Integer'Last; -- A : array (L .. H) := (1, others =>0); -- cannot be handled by a for loop. Thus for the following -- array (L .. H) := (.. positional elements.., others =>E); -- we always generate something like: -- J : Index_Type := Index_Of_Last_Positional_Element; -- while J < H loop -- J := Index_Base'Succ (J) -- Tmp (J) := E; -- end loop; function Build_Array_Aggr_Code (N : Node_Id; Ctype : Entity_Id; Index : Node_Id; Into : Node_Id; Scalar_Comp : Boolean; Indices : List_Id := No_List; Flist : Node_Id := Empty) return List_Id is Loc : constant Source_Ptr := Sloc (N); Index_Base : constant Entity_Id := Base_Type (Etype (Index)); Index_Base_L : constant Node_Id := Type_Low_Bound (Index_Base); Index_Base_H : constant Node_Id := Type_High_Bound (Index_Base); function Add (Val : Int; To : Node_Id) return Node_Id; -- Returns an expression where Val is added to expression To, unless -- To+Val is provably out of To's base type range. To must be an -- already analyzed expression. function Empty_Range (L, H : Node_Id) return Boolean; -- Returns True if the range defined by L .. H is certainly empty function Equal (L, H : Node_Id) return Boolean; -- Returns True if L = H for sure function Index_Base_Name return Node_Id; -- Returns a new reference to the index type name function Gen_Assign (Ind : Node_Id; Expr : Node_Id) return List_Id; -- Ind must be a side-effect free expression. If the input aggregate -- N to Build_Loop contains no sub-aggregates, then this function -- returns the assignment statement: -- -- Into (Indices, Ind) := Expr; -- -- Otherwise we call Build_Code recursively -- -- Ada 2005 (AI-287): In case of default initialized component, Expr -- is empty and we generate a call to the corresponding IP subprogram. function Gen_Loop (L, H : Node_Id; Expr : Node_Id) return List_Id; -- Nodes L and H must be side-effect free expressions. -- If the input aggregate N to Build_Loop contains no sub-aggregates, -- This routine returns the for loop statement -- -- for J in Index_Base'(L) .. Index_Base'(H) loop -- Into (Indices, J) := Expr; -- end loop; -- -- Otherwise we call Build_Code recursively. -- As an optimization if the loop covers 3 or less scalar elements we -- generate a sequence of assignments. function Gen_While (L, H : Node_Id; Expr : Node_Id) return List_Id; -- Nodes L and H must be side-effect free expressions. -- If the input aggregate N to Build_Loop contains no sub-aggregates, -- This routine returns the while loop statement -- -- J : Index_Base := L; -- while J < H loop -- J := Index_Base'Succ (J); -- Into (Indices, J) := Expr; -- end loop; -- -- Otherwise we call Build_Code recursively function Local_Compile_Time_Known_Value (E : Node_Id) return Boolean; function Local_Expr_Value (E : Node_Id) return Uint; -- These two Local routines are used to replace the corresponding ones -- in sem_eval because while processing the bounds of an aggregate with -- discrete choices whose index type is an enumeration, we build static -- expressions not recognized by Compile_Time_Known_Value as such since -- they have not yet been analyzed and resolved. All the expressions in -- question are things like Index_Base_Name'Val (Const) which we can -- easily recognize as being constant. --------- -- Add -- --------- function Add (Val : Int; To : Node_Id) return Node_Id is Expr_Pos : Node_Id; Expr : Node_Id; To_Pos : Node_Id; U_To : Uint; U_Val : constant Uint := UI_From_Int (Val); begin -- Note: do not try to optimize the case of Val = 0, because -- we need to build a new node with the proper Sloc value anyway. -- First test if we can do constant folding if Local_Compile_Time_Known_Value (To) then U_To := Local_Expr_Value (To) + Val; -- Determine if our constant is outside the range of the index. -- If so return an Empty node. This empty node will be caught -- by Empty_Range below. if Compile_Time_Known_Value (Index_Base_L) and then U_To < Expr_Value (Index_Base_L) then return Empty; elsif Compile_Time_Known_Value (Index_Base_H) and then U_To > Expr_Value (Index_Base_H) then return Empty; end if; Expr_Pos := Make_Integer_Literal (Loc, U_To); Set_Is_Static_Expression (Expr_Pos); if not Is_Enumeration_Type (Index_Base) then Expr := Expr_Pos; -- If we are dealing with enumeration return -- Index_Base'Val (Expr_Pos) else Expr := Make_Attribute_Reference (Loc, Prefix => Index_Base_Name, Attribute_Name => Name_Val, Expressions => New_List (Expr_Pos)); end if; return Expr; end if; -- If we are here no constant folding possible if not Is_Enumeration_Type (Index_Base) then Expr := Make_Op_Add (Loc, Left_Opnd => Duplicate_Subexpr (To), Right_Opnd => Make_Integer_Literal (Loc, U_Val)); -- If we are dealing with enumeration return -- Index_Base'Val (Index_Base'Pos (To) + Val) else To_Pos := Make_Attribute_Reference (Loc, Prefix => Index_Base_Name, Attribute_Name => Name_Pos, Expressions => New_List (Duplicate_Subexpr (To))); Expr_Pos := Make_Op_Add (Loc, Left_Opnd => To_Pos, Right_Opnd => Make_Integer_Literal (Loc, U_Val)); Expr := Make_Attribute_Reference (Loc, Prefix => Index_Base_Name, Attribute_Name => Name_Val, Expressions => New_List (Expr_Pos)); end if; return Expr; end Add; ----------------- -- Empty_Range -- ----------------- function Empty_Range (L, H : Node_Id) return Boolean is Is_Empty : Boolean := False; Low : Node_Id; High : Node_Id; begin -- First check if L or H were already detected as overflowing the -- index base range type by function Add above. If this is so Add -- returns the empty node. if No (L) or else No (H) then return True; end if; for J in 1 .. 3 loop case J is -- L > H range is empty when 1 => Low := L; High := H; -- B_L > H range must be empty when 2 => Low := Index_Base_L; High := H; -- L > B_H range must be empty when 3 => Low := L; High := Index_Base_H; end case; if Local_Compile_Time_Known_Value (Low) and then Local_Compile_Time_Known_Value (High) then Is_Empty := UI_Gt (Local_Expr_Value (Low), Local_Expr_Value (High)); end if; exit when Is_Empty; end loop; return Is_Empty; end Empty_Range; ----------- -- Equal -- ----------- function Equal (L, H : Node_Id) return Boolean is begin if L = H then return True; elsif Local_Compile_Time_Known_Value (L) and then Local_Compile_Time_Known_Value (H) then return UI_Eq (Local_Expr_Value (L), Local_Expr_Value (H)); end if; return False; end Equal; ---------------- -- Gen_Assign -- ---------------- function Gen_Assign (Ind : Node_Id; Expr : Node_Id) return List_Id is L : constant List_Id := New_List; F : Entity_Id; A : Node_Id; New_Indices : List_Id; Indexed_Comp : Node_Id; Expr_Q : Node_Id; Comp_Type : Entity_Id := Empty; function Add_Loop_Actions (Lis : List_Id) return List_Id; -- Collect insert_actions generated in the construction of a -- loop, and prepend them to the sequence of assignments to -- complete the eventual body of the loop. ---------------------- -- Add_Loop_Actions -- ---------------------- function Add_Loop_Actions (Lis : List_Id) return List_Id is Res : List_Id; begin -- Ada 2005 (AI-287): Do nothing else in case of default -- initialized component. if not Present (Expr) then return Lis; elsif Nkind (Parent (Expr)) = N_Component_Association and then Present (Loop_Actions (Parent (Expr))) then Append_List (Lis, Loop_Actions (Parent (Expr))); Res := Loop_Actions (Parent (Expr)); Set_Loop_Actions (Parent (Expr), No_List); return Res; else return Lis; end if; end Add_Loop_Actions; -- Start of processing for Gen_Assign begin if No (Indices) then New_Indices := New_List; else New_Indices := New_Copy_List_Tree (Indices); end if; Append_To (New_Indices, Ind); if Present (Flist) then F := New_Copy_Tree (Flist); elsif Present (Etype (N)) and then Controlled_Type (Etype (N)) then if Is_Entity_Name (Into) and then Present (Scope (Entity (Into))) then F := Find_Final_List (Scope (Entity (Into))); else F := Find_Final_List (Current_Scope); end if; else F := Empty; end if; if Present (Next_Index (Index)) then return Add_Loop_Actions ( Build_Array_Aggr_Code (N => Expr, Ctype => Ctype, Index => Next_Index (Index), Into => Into, Scalar_Comp => Scalar_Comp, Indices => New_Indices, Flist => F)); end if; -- If we get here then we are at a bottom-level (sub-)aggregate Indexed_Comp := Checks_Off (Make_Indexed_Component (Loc, Prefix => New_Copy_Tree (Into), Expressions => New_Indices)); Set_Assignment_OK (Indexed_Comp); -- Ada 2005 (AI-287): In case of default initialized component, Expr -- is not present (and therefore we also initialize Expr_Q to empty). if not Present (Expr) then Expr_Q := Empty; elsif Nkind (Expr) = N_Qualified_Expression then Expr_Q := Expression (Expr); else Expr_Q := Expr; end if; if Present (Etype (N)) and then Etype (N) /= Any_Composite then Comp_Type := Component_Type (Etype (N)); pragma Assert (Comp_Type = Ctype); -- AI-287 elsif Present (Next (First (New_Indices))) then -- Ada 2005 (AI-287): Do nothing in case of default initialized -- component because we have received the component type in -- the formal parameter Ctype. -- ??? Some assert pragmas have been added to check if this new -- formal can be used to replace this code in all cases. if Present (Expr) then -- This is a multidimensional array. Recover the component -- type from the outermost aggregate, because subaggregates -- do not have an assigned type. declare P : Node_Id := Parent (Expr); begin while Present (P) loop if Nkind (P) = N_Aggregate and then Present (Etype (P)) then Comp_Type := Component_Type (Etype (P)); exit; else P := Parent (P); end if; end loop; pragma Assert (Comp_Type = Ctype); -- AI-287 end; end if; end if; -- Ada 2005 (AI-287): We only analyze the expression in case of non- -- default initialized components (otherwise Expr_Q is not present). if Present (Expr_Q) and then (Nkind (Expr_Q) = N_Aggregate or else Nkind (Expr_Q) = N_Extension_Aggregate) then -- At this stage the Expression may not have been -- analyzed yet because the array aggregate code has not -- been updated to use the Expansion_Delayed flag and -- avoid analysis altogether to solve the same problem -- (see Resolve_Aggr_Expr). So let us do the analysis of -- non-array aggregates now in order to get the value of -- Expansion_Delayed flag for the inner aggregate ??? if Present (Comp_Type) and then not Is_Array_Type (Comp_Type) then Analyze_And_Resolve (Expr_Q, Comp_Type); end if; if Is_Delayed_Aggregate (Expr_Q) then -- This is either a subaggregate of a multidimentional array, -- or a component of an array type whose component type is -- also an array. In the latter case, the expression may have -- component associations that provide different bounds from -- those of the component type, and sliding must occur. Instead -- of decomposing the current aggregate assignment, force the -- re-analysis of the assignment, so that a temporary will be -- generated in the usual fashion, and sliding will take place. if Nkind (Parent (N)) = N_Assignment_Statement and then Is_Array_Type (Comp_Type) and then Present (Component_Associations (Expr_Q)) and then Must_Slide (Comp_Type, Etype (Expr_Q)) then Set_Expansion_Delayed (Expr_Q, False); Set_Analyzed (Expr_Q, False); else return Add_Loop_Actions ( Late_Expansion ( Expr_Q, Etype (Expr_Q), Indexed_Comp, F)); end if; end if; end if; -- Ada 2005 (AI-287): In case of default initialized component, call -- the initialization subprogram associated with the component type. if not Present (Expr) then if Present (Base_Init_Proc (Etype (Ctype))) or else Has_Task (Base_Type (Ctype)) then Append_List_To (L, Build_Initialization_Call (Loc, Id_Ref => Indexed_Comp, Typ => Ctype, With_Default_Init => True)); end if; else -- Now generate the assignment with no associated controlled -- actions since the target of the assignment may not have -- been initialized, it is not possible to Finalize it as -- expected by normal controlled assignment. The rest of the -- controlled actions are done manually with the proper -- finalization list coming from the context. A := Make_OK_Assignment_Statement (Loc, Name => Indexed_Comp, Expression => New_Copy_Tree (Expr)); if Present (Comp_Type) and then Controlled_Type (Comp_Type) then Set_No_Ctrl_Actions (A); end if; Append_To (L, A); -- Adjust the tag if tagged (because of possible view -- conversions), unless compiling for the Java VM -- where tags are implicit. if Present (Comp_Type) and then Is_Tagged_Type (Comp_Type) and then not Java_VM then A := Make_OK_Assignment_Statement (Loc, Name => Make_Selected_Component (Loc, Prefix => New_Copy_Tree (Indexed_Comp), Selector_Name => New_Reference_To (Tag_Component (Comp_Type), Loc)), Expression => Unchecked_Convert_To (RTE (RE_Tag), New_Reference_To ( Access_Disp_Table (Comp_Type), Loc))); Append_To (L, A); end if; -- Adjust and Attach the component to the proper final list -- which can be the controller of the outer record object or -- the final list associated with the scope if Present (Comp_Type) and then Controlled_Type (Comp_Type) then Append_List_To (L, Make_Adjust_Call ( Ref => New_Copy_Tree (Indexed_Comp), Typ => Comp_Type, Flist_Ref => F, With_Attach => Make_Integer_Literal (Loc, 1))); end if; end if; return Add_Loop_Actions (L); end Gen_Assign; -------------- -- Gen_Loop -- -------------- function Gen_Loop (L, H : Node_Id; Expr : Node_Id) return List_Id is L_J : Node_Id; L_Range : Node_Id; -- Index_Base'(L) .. Index_Base'(H) L_Iteration_Scheme : Node_Id; -- L_J in Index_Base'(L) .. Index_Base'(H) L_Body : List_Id; -- The statements to execute in the loop S : constant List_Id := New_List; -- List of statements Tcopy : Node_Id; -- Copy of expression tree, used for checking purposes begin -- If loop bounds define an empty range return the null statement if Empty_Range (L, H) then Append_To (S, Make_Null_Statement (Loc)); -- Ada 2005 (AI-287): Nothing else need to be done in case of -- default initialized component. if not Present (Expr) then null; else -- The expression must be type-checked even though no component -- of the aggregate will have this value. This is done only for -- actual components of the array, not for subaggregates. Do -- the check on a copy, because the expression may be shared -- among several choices, some of which might be non-null. if Present (Etype (N)) and then Is_Array_Type (Etype (N)) and then No (Next_Index (Index)) then Expander_Mode_Save_And_Set (False); Tcopy := New_Copy_Tree (Expr); Set_Parent (Tcopy, N); Analyze_And_Resolve (Tcopy, Component_Type (Etype (N))); Expander_Mode_Restore; end if; end if; return S; -- If loop bounds are the same then generate an assignment elsif Equal (L, H) then return Gen_Assign (New_Copy_Tree (L), Expr); -- If H - L <= 2 then generate a sequence of assignments -- when we are processing the bottom most aggregate and it contains -- scalar components. elsif No (Next_Index (Index)) and then Scalar_Comp and then Local_Compile_Time_Known_Value (L) and then Local_Compile_Time_Known_Value (H) and then Local_Expr_Value (H) - Local_Expr_Value (L) <= 2 then Append_List_To (S, Gen_Assign (New_Copy_Tree (L), Expr)); Append_List_To (S, Gen_Assign (Add (1, To => L), Expr)); if Local_Expr_Value (H) - Local_Expr_Value (L) = 2 then Append_List_To (S, Gen_Assign (Add (2, To => L), Expr)); end if; return S; end if; -- Otherwise construct the loop, starting with the loop index L_J L_J := Make_Defining_Identifier (Loc, New_Internal_Name ('J')); -- Construct "L .. H" L_Range := Make_Range (Loc, Low_Bound => Make_Qualified_Expression (Loc, Subtype_Mark => Index_Base_Name, Expression => L), High_Bound => Make_Qualified_Expression (Loc, Subtype_Mark => Index_Base_Name, Expression => H)); -- Construct "for L_J in Index_Base range L .. H" L_Iteration_Scheme := Make_Iteration_Scheme (Loc, Loop_Parameter_Specification => Make_Loop_Parameter_Specification (Loc, Defining_Identifier => L_J, Discrete_Subtype_Definition => L_Range)); -- Construct the statements to execute in the loop body L_Body := Gen_Assign (New_Reference_To (L_J, Loc), Expr); -- Construct the final loop Append_To (S, Make_Implicit_Loop_Statement (Node => N, Identifier => Empty, Iteration_Scheme => L_Iteration_Scheme, Statements => L_Body)); return S; end Gen_Loop; --------------- -- Gen_While -- --------------- -- The code built is -- W_J : Index_Base := L; -- while W_J < H loop -- W_J := Index_Base'Succ (W); -- L_Body; -- end loop; function Gen_While (L, H : Node_Id; Expr : Node_Id) return List_Id is W_J : Node_Id; W_Decl : Node_Id; -- W_J : Base_Type := L; W_Iteration_Scheme : Node_Id; -- while W_J < H W_Index_Succ : Node_Id; -- Index_Base'Succ (J) W_Increment : Node_Id; -- W_J := Index_Base'Succ (W) W_Body : constant List_Id := New_List; -- The statements to execute in the loop S : constant List_Id := New_List; -- list of statement begin -- If loop bounds define an empty range or are equal return null if Empty_Range (L, H) or else Equal (L, H) then Append_To (S, Make_Null_Statement (Loc)); return S; end if; -- Build the decl of W_J W_J := Make_Defining_Identifier (Loc, New_Internal_Name ('J')); W_Decl := Make_Object_Declaration (Loc, Defining_Identifier => W_J, Object_Definition => Index_Base_Name, Expression => L); -- Theoretically we should do a New_Copy_Tree (L) here, but we know -- that in this particular case L is a fresh Expr generated by -- Add which we are the only ones to use. Append_To (S, W_Decl); -- Construct " while W_J < H" W_Iteration_Scheme := Make_Iteration_Scheme (Loc, Condition => Make_Op_Lt (Loc, Left_Opnd => New_Reference_To (W_J, Loc), Right_Opnd => New_Copy_Tree (H))); -- Construct the statements to execute in the loop body W_Index_Succ := Make_Attribute_Reference (Loc, Prefix => Index_Base_Name, Attribute_Name => Name_Succ, Expressions => New_List (New_Reference_To (W_J, Loc))); W_Increment := Make_OK_Assignment_Statement (Loc, Name => New_Reference_To (W_J, Loc), Expression => W_Index_Succ); Append_To (W_Body, W_Increment); Append_List_To (W_Body, Gen_Assign (New_Reference_To (W_J, Loc), Expr)); -- Construct the final loop Append_To (S, Make_Implicit_Loop_Statement (Node => N, Identifier => Empty, Iteration_Scheme => W_Iteration_Scheme, Statements => W_Body)); return S; end Gen_While; --------------------- -- Index_Base_Name -- --------------------- function Index_Base_Name return Node_Id is begin return New_Reference_To (Index_Base, Sloc (N)); end Index_Base_Name; ------------------------------------ -- Local_Compile_Time_Known_Value -- ------------------------------------ function Local_Compile_Time_Known_Value (E : Node_Id) return Boolean is begin return Compile_Time_Known_Value (E) or else (Nkind (E) = N_Attribute_Reference and then Attribute_Name (E) = Name_Val and then Compile_Time_Known_Value (First (Expressions (E)))); end Local_Compile_Time_Known_Value; ---------------------- -- Local_Expr_Value -- ---------------------- function Local_Expr_Value (E : Node_Id) return Uint is begin if Compile_Time_Known_Value (E) then return Expr_Value (E); else return Expr_Value (First (Expressions (E))); end if; end Local_Expr_Value; -- Build_Array_Aggr_Code Variables Assoc : Node_Id; Choice : Node_Id; Expr : Node_Id; Typ : Entity_Id; Others_Expr : Node_Id := Empty; Others_Mbox_Present : Boolean := False; Aggr_L : constant Node_Id := Low_Bound (Aggregate_Bounds (N)); Aggr_H : constant Node_Id := High_Bound (Aggregate_Bounds (N)); -- The aggregate bounds of this specific sub-aggregate. Note that if -- the code generated by Build_Array_Aggr_Code is executed then these -- bounds are OK. Otherwise a Constraint_Error would have been raised. Aggr_Low : constant Node_Id := Duplicate_Subexpr_No_Checks (Aggr_L); Aggr_High : constant Node_Id := Duplicate_Subexpr_No_Checks (Aggr_H); -- After Duplicate_Subexpr these are side-effect free Low : Node_Id; High : Node_Id; Nb_Choices : Nat := 0; Table : Case_Table_Type (1 .. Number_Of_Choices (N)); -- Used to sort all the different choice values Nb_Elements : Int; -- Number of elements in the positional aggregate New_Code : constant List_Id := New_List; -- Start of processing for Build_Array_Aggr_Code begin -- First before we start, a special case. if we have a bit packed -- array represented as a modular type, then clear the value to -- zero first, to ensure that unused bits are properly cleared. Typ := Etype (N); if Present (Typ) and then Is_Bit_Packed_Array (Typ) and then Is_Modular_Integer_Type (Packed_Array_Type (Typ)) then Append_To (New_Code, Make_Assignment_Statement (Loc, Name => New_Copy_Tree (Into), Expression => Unchecked_Convert_To (Typ, Make_Integer_Literal (Loc, Uint_0)))); end if; -- We can skip this -- STEP 1: Process component associations -- For those associations that may generate a loop, initialize -- Loop_Actions to collect inserted actions that may be crated. if No (Expressions (N)) then -- STEP 1 (a): Sort the discrete choices Assoc := First (Component_Associations (N)); while Present (Assoc) loop Choice := First (Choices (Assoc)); while Present (Choice) loop if Nkind (Choice) = N_Others_Choice then Set_Loop_Actions (Assoc, New_List); if Box_Present (Assoc) then Others_Mbox_Present := True; else Others_Expr := Expression (Assoc); end if; exit; end if; Get_Index_Bounds (Choice, Low, High); if Low /= High then Set_Loop_Actions (Assoc, New_List); end if; Nb_Choices := Nb_Choices + 1; if Box_Present (Assoc) then Table (Nb_Choices) := (Choice_Lo => Low, Choice_Hi => High, Choice_Node => Empty); else Table (Nb_Choices) := (Choice_Lo => Low, Choice_Hi => High, Choice_Node => Expression (Assoc)); end if; Next (Choice); end loop; Next (Assoc); end loop; -- If there is more than one set of choices these must be static -- and we can therefore sort them. Remember that Nb_Choices does not -- account for an others choice. if Nb_Choices > 1 then Sort_Case_Table (Table); end if; -- STEP 1 (b): take care of the whole set of discrete choices for J in 1 .. Nb_Choices loop Low := Table (J).Choice_Lo; High := Table (J).Choice_Hi; Expr := Table (J).Choice_Node; Append_List (Gen_Loop (Low, High, Expr), To => New_Code); end loop; -- STEP 1 (c): generate the remaining loops to cover others choice -- We don't need to generate loops over empty gaps, but if there is -- a single empty range we must analyze the expression for semantics if Present (Others_Expr) or else Others_Mbox_Present then declare First : Boolean := True; begin for J in 0 .. Nb_Choices loop if J = 0 then Low := Aggr_Low; else Low := Add (1, To => Table (J).Choice_Hi); end if; if J = Nb_Choices then High := Aggr_High; else High := Add (-1, To => Table (J + 1).Choice_Lo); end if; -- If this is an expansion within an init proc, make -- sure that discriminant references are replaced by -- the corresponding discriminal. if Inside_Init_Proc then if Is_Entity_Name (Low) and then Ekind (Entity (Low)) = E_Discriminant then Set_Entity (Low, Discriminal (Entity (Low))); end if; if Is_Entity_Name (High) and then Ekind (Entity (High)) = E_Discriminant then Set_Entity (High, Discriminal (Entity (High))); end if; end if; if First or else not Empty_Range (Low, High) then First := False; Append_List (Gen_Loop (Low, High, Others_Expr), To => New_Code); end if; end loop; end; end if; -- STEP 2: Process positional components else -- STEP 2 (a): Generate the assignments for each positional element -- Note that here we have to use Aggr_L rather than Aggr_Low because -- Aggr_L is analyzed and Add wants an analyzed expression. Expr := First (Expressions (N)); Nb_Elements := -1; while Present (Expr) loop Nb_Elements := Nb_Elements + 1; Append_List (Gen_Assign (Add (Nb_Elements, To => Aggr_L), Expr), To => New_Code); Next (Expr); end loop; -- STEP 2 (b): Generate final loop if an others choice is present -- Here Nb_Elements gives the offset of the last positional element. if Present (Component_Associations (N)) then Assoc := Last (Component_Associations (N)); -- Ada 2005 (AI-287) if Box_Present (Assoc) then Append_List (Gen_While (Add (Nb_Elements, To => Aggr_L), Aggr_High, Empty), To => New_Code); else Expr := Expression (Assoc); Append_List (Gen_While (Add (Nb_Elements, To => Aggr_L), Aggr_High, Expr), -- AI-287 To => New_Code); end if; end if; end if; return New_Code; end Build_Array_Aggr_Code; ---------------------------- -- Build_Record_Aggr_Code -- ---------------------------- function Build_Record_Aggr_Code (N : Node_Id; Typ : Entity_Id; Target : Node_Id; Flist : Node_Id := Empty; Obj : Entity_Id := Empty; Is_Limited_Ancestor_Expansion : Boolean := False) return List_Id is Loc : constant Source_Ptr := Sloc (N); L : constant List_Id := New_List; Start_L : constant List_Id := New_List; N_Typ : constant Entity_Id := Etype (N); Comp : Node_Id; Instr : Node_Id; Ref : Node_Id; F : Node_Id; Comp_Type : Entity_Id; Selector : Entity_Id; Comp_Expr : Node_Id; Expr_Q : Node_Id; Internal_Final_List : Node_Id; -- If this is an internal aggregate, the External_Final_List is an -- expression for the controller record of the enclosing type. -- If the current aggregate has several controlled components, this -- expression will appear in several calls to attach to the finali- -- zation list, and it must not be shared. External_Final_List : Node_Id; Ancestor_Is_Expression : Boolean := False; Ancestor_Is_Subtype_Mark : Boolean := False; Init_Typ : Entity_Id := Empty; Attach : Node_Id; function Get_Constraint_Association (T : Entity_Id) return Node_Id; -- Returns the first discriminant association in the constraint -- associated with T, if any, otherwise returns Empty. function Ancestor_Discriminant_Value (Disc : Entity_Id) return Node_Id; -- Returns the value that the given discriminant of an ancestor -- type should receive (in the absence of a conflict with the -- value provided by an ancestor part of an extension aggregate). procedure Check_Ancestor_Discriminants (Anc_Typ : Entity_Id); -- Check that each of the discriminant values defined by the -- ancestor part of an extension aggregate match the corresponding -- values provided by either an association of the aggregate or -- by the constraint imposed by a parent type (RM95-4.3.2(8)). function Init_Controller (Target : Node_Id; Typ : Entity_Id; F : Node_Id; Attach : Node_Id; Init_Pr : Boolean) return List_Id; -- returns the list of statements necessary to initialize the internal -- controller of the (possible) ancestor typ into target and attach -- it to finalization list F. Init_Pr conditions the call to the -- init proc since it may already be done due to ancestor initialization --------------------------------- -- Ancestor_Discriminant_Value -- --------------------------------- function Ancestor_Discriminant_Value (Disc : Entity_Id) return Node_Id is Assoc : Node_Id; Assoc_Elmt : Elmt_Id; Aggr_Comp : Entity_Id; Corresp_Disc : Entity_Id; Current_Typ : Entity_Id := Base_Type (Typ); Parent_Typ : Entity_Id; Parent_Disc : Entity_Id; Save_Assoc : Node_Id := Empty; begin -- First check any discriminant associations to see if -- any of them provide a value for the discriminant. if Present (Discriminant_Specifications (Parent (Current_Typ))) then Assoc := First (Component_Associations (N)); while Present (Assoc) loop Aggr_Comp := Entity (First (Choices (Assoc))); if Ekind (Aggr_Comp) = E_Discriminant then Save_Assoc := Expression (Assoc); Corresp_Disc := Corresponding_Discriminant (Aggr_Comp); while Present (Corresp_Disc) loop -- If found a corresponding discriminant then return -- the value given in the aggregate. (Note: this is -- not correct in the presence of side effects. ???) if Disc = Corresp_Disc then return Duplicate_Subexpr (Expression (Assoc)); end if; Corresp_Disc := Corresponding_Discriminant (Corresp_Disc); end loop; end if; Next (Assoc); end loop; end if; -- No match found in aggregate, so chain up parent types to find -- a constraint that defines the value of the discriminant. Parent_Typ := Etype (Current_Typ); while Current_Typ /= Parent_Typ loop if Has_Discriminants (Parent_Typ) then Parent_Disc := First_Discriminant (Parent_Typ); -- We either get the association from the subtype indication -- of the type definition itself, or from the discriminant -- constraint associated with the type entity (which is -- preferable, but it's not always present ???) if Is_Empty_Elmt_List ( Discriminant_Constraint (Current_Typ)) then Assoc := Get_Constraint_Association (Current_Typ); Assoc_Elmt := No_Elmt; else Assoc_Elmt := First_Elmt (Discriminant_Constraint (Current_Typ)); Assoc := Node (Assoc_Elmt); end if; -- Traverse the discriminants of the parent type looking -- for one that corresponds. while Present (Parent_Disc) and then Present (Assoc) loop Corresp_Disc := Parent_Disc; while Present (Corresp_Disc) and then Disc /= Corresp_Disc loop Corresp_Disc := Corresponding_Discriminant (Corresp_Disc); end loop; if Disc = Corresp_Disc then if Nkind (Assoc) = N_Discriminant_Association then Assoc := Expression (Assoc); end if; -- If the located association directly denotes -- a discriminant, then use the value of a saved -- association of the aggregate. This is a kludge -- to handle certain cases involving multiple -- discriminants mapped to a single discriminant -- of a descendant. It's not clear how to locate the -- appropriate discriminant value for such cases. ??? if Is_Entity_Name (Assoc) and then Ekind (Entity (Assoc)) = E_Discriminant then Assoc := Save_Assoc; end if; return Duplicate_Subexpr (Assoc); end if; Next_Discriminant (Parent_Disc); if No (Assoc_Elmt) then Next (Assoc); else Next_Elmt (Assoc_Elmt); if Present (Assoc_Elmt) then Assoc := Node (Assoc_Elmt); else Assoc := Empty; end if; end if; end loop; end if; Current_Typ := Parent_Typ; Parent_Typ := Etype (Current_Typ); end loop; -- In some cases there's no ancestor value to locate (such as -- when an ancestor part given by an expression defines the -- discriminant value). return Empty; end Ancestor_Discriminant_Value; ---------------------------------- -- Check_Ancestor_Discriminants -- ---------------------------------- procedure Check_Ancestor_Discriminants (Anc_Typ : Entity_Id) is Discr : Entity_Id := First_Discriminant (Base_Type (Anc_Typ)); Disc_Value : Node_Id; Cond : Node_Id; begin while Present (Discr) loop Disc_Value := Ancestor_Discriminant_Value (Discr); if Present (Disc_Value) then Cond := Make_Op_Ne (Loc, Left_Opnd => Make_Selected_Component (Loc, Prefix => New_Copy_Tree (Target), Selector_Name => New_Occurrence_Of (Discr, Loc)), Right_Opnd => Disc_Value); Append_To (L, Make_Raise_Constraint_Error (Loc, Condition => Cond, Reason => CE_Discriminant_Check_Failed)); end if; Next_Discriminant (Discr); end loop; end Check_Ancestor_Discriminants; -------------------------------- -- Get_Constraint_Association -- -------------------------------- function Get_Constraint_Association (T : Entity_Id) return Node_Id is Typ_Def : constant Node_Id := Type_Definition (Parent (T)); Indic : constant Node_Id := Subtype_Indication (Typ_Def); begin -- ??? Also need to cover case of a type mark denoting a subtype -- with constraint. if Nkind (Indic) = N_Subtype_Indication and then Present (Constraint (Indic)) then return First (Constraints (Constraint (Indic))); end if; return Empty; end Get_Constraint_Association; --------------------- -- Init_controller -- --------------------- function Init_Controller (Target : Node_Id; Typ : Entity_Id; F : Node_Id; Attach : Node_Id; Init_Pr : Boolean) return List_Id is L : constant List_Id := New_List; Ref : Node_Id; begin -- Generate: -- init-proc (target._controller); -- initialize (target._controller); -- Attach_to_Final_List (target._controller, F); Ref := Make_Selected_Component (Loc, Prefix => Convert_To (Typ, New_Copy_Tree (Target)), Selector_Name => Make_Identifier (Loc, Name_uController)); Set_Assignment_OK (Ref); -- Ada 2005 (AI-287): Give support to default initialization of -- limited types and components. if (Nkind (Target) = N_Identifier and then Present (Etype (Target)) and then Is_Limited_Type (Etype (Target))) or else (Nkind (Target) = N_Selected_Component and then Present (Etype (Selector_Name (Target))) and then Is_Limited_Type (Etype (Selector_Name (Target)))) or else (Nkind (Target) = N_Unchecked_Type_Conversion and then Present (Etype (Target)) and then Is_Limited_Type (Etype (Target))) or else (Nkind (Target) = N_Unchecked_Expression and then Nkind (Expression (Target)) = N_Indexed_Component and then Present (Etype (Prefix (Expression (Target)))) and then Is_Limited_Type (Etype (Prefix (Expression (Target))))) then if Init_Pr then Append_List_To (L, Build_Initialization_Call (Loc, Id_Ref => Ref, Typ => RTE (RE_Limited_Record_Controller), In_Init_Proc => Within_Init_Proc)); end if; Append_To (L, Make_Procedure_Call_Statement (Loc, Name => New_Reference_To (Find_Prim_Op (RTE (RE_Limited_Record_Controller), Name_Initialize), Loc), Parameter_Associations => New_List (New_Copy_Tree (Ref)))); else if Init_Pr then Append_List_To (L, Build_Initialization_Call (Loc, Id_Ref => Ref, Typ => RTE (RE_Record_Controller), In_Init_Proc => Within_Init_Proc)); end if; Append_To (L, Make_Procedure_Call_Statement (Loc, Name => New_Reference_To (Find_Prim_Op (RTE (RE_Record_Controller), Name_Initialize), Loc), Parameter_Associations => New_List (New_Copy_Tree (Ref)))); end if; Append_To (L, Make_Attach_Call ( Obj_Ref => New_Copy_Tree (Ref), Flist_Ref => F, With_Attach => Attach)); return L; end Init_Controller; -- Start of processing for Build_Record_Aggr_Code begin -- Deal with the ancestor part of extension aggregates -- or with the discriminants of the root type if Nkind (N) = N_Extension_Aggregate then declare A : constant Node_Id := Ancestor_Part (N); begin -- If the ancestor part is a subtype mark "T", we generate -- init-proc (T(tmp)); if T is constrained and -- init-proc (S(tmp)); where S applies an appropriate -- constraint if T is unconstrained if Is_Entity_Name (A) and then Is_Type (Entity (A)) then Ancestor_Is_Subtype_Mark := True; if Is_Constrained (Entity (A)) then Init_Typ := Entity (A); -- For an ancestor part given by an unconstrained type -- mark, create a subtype constrained by appropriate -- corresponding discriminant values coming from either -- associations of the aggregate or a constraint on -- a parent type. The subtype will be used to generate -- the correct default value for the ancestor part. elsif Has_Discriminants (Entity (A)) then declare Anc_Typ : constant Entity_Id := Entity (A); Anc_Constr : constant List_Id := New_List; Discrim : Entity_Id; Disc_Value : Node_Id; New_Indic : Node_Id; Subt_Decl : Node_Id; begin Discrim := First_Discriminant (Anc_Typ); while Present (Discrim) loop Disc_Value := Ancestor_Discriminant_Value (Discrim); Append_To (Anc_Constr, Disc_Value); Next_Discriminant (Discrim); end loop; New_Indic := Make_Subtype_Indication (Loc, Subtype_Mark => New_Occurrence_Of (Anc_Typ, Loc), Constraint => Make_Index_Or_Discriminant_Constraint (Loc, Constraints => Anc_Constr)); Init_Typ := Create_Itype (Ekind (Anc_Typ), N); Subt_Decl := Make_Subtype_Declaration (Loc, Defining_Identifier => Init_Typ, Subtype_Indication => New_Indic); -- Itypes must be analyzed with checks off -- Declaration must have a parent for proper -- handling of subsidiary actions. Set_Parent (Subt_Decl, N); Analyze (Subt_Decl, Suppress => All_Checks); end; end if; Ref := Convert_To (Init_Typ, New_Copy_Tree (Target)); Set_Assignment_OK (Ref); if Has_Default_Init_Comps (N) or else Has_Task (Base_Type (Init_Typ)) then Append_List_To (Start_L, Build_Initialization_Call (Loc, Id_Ref => Ref, Typ => Init_Typ, In_Init_Proc => Within_Init_Proc, With_Default_Init => True)); else Append_List_To (Start_L, Build_Initialization_Call (Loc, Id_Ref => Ref, Typ => Init_Typ, In_Init_Proc => Within_Init_Proc)); end if; if Is_Constrained (Entity (A)) and then Has_Discriminants (Entity (A)) then Check_Ancestor_Discriminants (Entity (A)); end if; -- Ada 2005 (AI-287): If the ancestor part is a limited type, -- a recursive call expands the ancestor. elsif Is_Limited_Type (Etype (A)) then Ancestor_Is_Expression := True; Append_List_To (Start_L, Build_Record_Aggr_Code ( N => Expression (A), Typ => Etype (Expression (A)), Target => Target, Flist => Flist, Obj => Obj, Is_Limited_Ancestor_Expansion => True)); -- If the ancestor part is an expression "E", we generate -- T(tmp) := E; else Ancestor_Is_Expression := True; Init_Typ := Etype (A); -- Assign the tag before doing the assignment to make sure -- that the dispatching call in the subsequent deep_adjust -- works properly (unless Java_VM, where tags are implicit). if not Java_VM then Instr := Make_OK_Assignment_Statement (Loc, Name => Make_Selected_Component (Loc, Prefix => New_Copy_Tree (Target), Selector_Name => New_Reference_To ( Tag_Component (Base_Type (Typ)), Loc)), Expression => Unchecked_Convert_To (RTE (RE_Tag), New_Reference_To ( Access_Disp_Table (Base_Type (Typ)), Loc))); Set_Assignment_OK (Name (Instr)); Append_To (L, Instr); end if; -- If the ancestor part is an aggregate, force its full -- expansion, which was delayed. if Nkind (A) = N_Qualified_Expression and then (Nkind (Expression (A)) = N_Aggregate or else Nkind (Expression (A)) = N_Extension_Aggregate) then Set_Analyzed (A, False); Set_Analyzed (Expression (A), False); end if; Ref := Convert_To (Init_Typ, New_Copy_Tree (Target)); Set_Assignment_OK (Ref); Append_To (L, Make_Unsuppress_Block (Loc, Name_Discriminant_Check, New_List ( Make_OK_Assignment_Statement (Loc, Name => Ref, Expression => A)))); if Has_Discriminants (Init_Typ) then Check_Ancestor_Discriminants (Init_Typ); end if; end if; end; -- Normal case (not an extension aggregate) else -- Generate the discriminant expressions, component by component. -- If the base type is an unchecked union, the discriminants are -- unknown to the back-end and absent from a value of the type, so -- assignments for them are not emitted. if Has_Discriminants (Typ) and then not Is_Unchecked_Union (Base_Type (Typ)) then -- ??? The discriminants of the object not inherited in the type -- of the object should be initialized here null; -- Generate discriminant init values declare Discriminant : Entity_Id; Discriminant_Value : Node_Id; begin Discriminant := First_Stored_Discriminant (Typ); while Present (Discriminant) loop Comp_Expr := Make_Selected_Component (Loc, Prefix => New_Copy_Tree (Target), Selector_Name => New_Occurrence_Of (Discriminant, Loc)); Discriminant_Value := Get_Discriminant_Value ( Discriminant, N_Typ, Discriminant_Constraint (N_Typ)); Instr := Make_OK_Assignment_Statement (Loc, Name => Comp_Expr, Expression => New_Copy_Tree (Discriminant_Value)); Set_No_Ctrl_Actions (Instr); Append_To (L, Instr); Next_Stored_Discriminant (Discriminant); end loop; end; end if; end if; -- Generate the assignments, component by component -- tmp.comp1 := Expr1_From_Aggr; -- tmp.comp2 := Expr2_From_Aggr; -- .... Comp := First (Component_Associations (N)); while Present (Comp) loop Selector := Entity (First (Choices (Comp))); -- Ada 2005 (AI-287): Default initialization of a limited component if Box_Present (Comp) and then Is_Limited_Type (Etype (Selector)) then -- Ada 2005 (AI-287): If the component type has tasks then -- generate the activation chain and master entities (except -- in case of an allocator because in that case these entities -- are generated by Build_Task_Allocate_Block_With_Init_Stmts). declare Ctype : constant Entity_Id := Etype (Selector); Inside_Allocator : Boolean := False; P : Node_Id := Parent (N); begin if Is_Task_Type (Ctype) or else Has_Task (Ctype) then while Present (P) loop if Nkind (P) = N_Allocator then Inside_Allocator := True; exit; end if; P := Parent (P); end loop; if not Inside_Init_Proc and not Inside_Allocator then Build_Activation_Chain_Entity (N); if not Has_Master_Entity (Current_Scope) then Build_Master_Entity (Etype (N)); end if; end if; end if; end; Append_List_To (L, Build_Initialization_Call (Loc, Id_Ref => Make_Selected_Component (Loc, Prefix => New_Copy_Tree (Target), Selector_Name => New_Occurrence_Of (Selector, Loc)), Typ => Etype (Selector), With_Default_Init => True)); goto Next_Comp; end if; -- ??? if Ekind (Selector) /= E_Discriminant or else Nkind (N) = N_Extension_Aggregate then Comp_Type := Etype (Selector); Comp_Expr := Make_Selected_Component (Loc, Prefix => New_Copy_Tree (Target), Selector_Name => New_Occurrence_Of (Selector, Loc)); if Nkind (Expression (Comp)) = N_Qualified_Expression then Expr_Q := Expression (Expression (Comp)); else Expr_Q := Expression (Comp); end if; -- The controller is the one of the parent type defining -- the component (in case of inherited components). if Controlled_Type (Comp_Type) then Internal_Final_List := Make_Selected_Component (Loc, Prefix => Convert_To ( Scope (Original_Record_Component (Selector)), New_Copy_Tree (Target)), Selector_Name => Make_Identifier (Loc, Name_uController)); Internal_Final_List := Make_Selected_Component (Loc, Prefix => Internal_Final_List, Selector_Name => Make_Identifier (Loc, Name_F)); -- The internal final list can be part of a constant object Set_Assignment_OK (Internal_Final_List); else Internal_Final_List := Empty; end if; -- ??? if Is_Delayed_Aggregate (Expr_Q) then Append_List_To (L, Late_Expansion (Expr_Q, Comp_Type, Comp_Expr, Internal_Final_List)); else Instr := Make_OK_Assignment_Statement (Loc, Name => Comp_Expr, Expression => Expression (Comp)); Set_No_Ctrl_Actions (Instr); Append_To (L, Instr); -- Adjust the tag if tagged (because of possible view -- conversions), unless compiling for the Java VM -- where tags are implicit. -- tmp.comp._tag := comp_typ'tag; if Is_Tagged_Type (Comp_Type) and then not Java_VM then Instr := Make_OK_Assignment_Statement (Loc, Name => Make_Selected_Component (Loc, Prefix => New_Copy_Tree (Comp_Expr), Selector_Name => New_Reference_To (Tag_Component (Comp_Type), Loc)), Expression => Unchecked_Convert_To (RTE (RE_Tag), New_Reference_To ( Access_Disp_Table (Comp_Type), Loc))); Append_To (L, Instr); end if; -- Adjust and Attach the component to the proper controller -- Adjust (tmp.comp); -- Attach_To_Final_List (tmp.comp, -- comp_typ (tmp)._record_controller.f) if Controlled_Type (Comp_Type) then Append_List_To (L, Make_Adjust_Call ( Ref => New_Copy_Tree (Comp_Expr), Typ => Comp_Type, Flist_Ref => Internal_Final_List, With_Attach => Make_Integer_Literal (Loc, 1))); end if; end if; -- ??? elsif Ekind (Selector) = E_Discriminant and then Nkind (N) /= N_Extension_Aggregate and then Nkind (Parent (N)) = N_Component_Association and then Is_Constrained (Typ) then -- We must check that the discriminant value imposed by the -- context is the same as the value given in the subaggregate, -- because after the expansion into assignments there is no -- record on which to perform a regular discriminant check. declare D_Val : Elmt_Id; Disc : Entity_Id; begin D_Val := First_Elmt (Discriminant_Constraint (Typ)); Disc := First_Discriminant (Typ); while Chars (Disc) /= Chars (Selector) loop Next_Discriminant (Disc); Next_Elmt (D_Val); end loop; pragma Assert (Present (D_Val)); Append_To (L, Make_Raise_Constraint_Error (Loc, Condition => Make_Op_Ne (Loc, Left_Opnd => New_Copy_Tree (Node (D_Val)), Right_Opnd => Expression (Comp)), Reason => CE_Discriminant_Check_Failed)); end; end if; <> Next (Comp); end loop; -- If the type is tagged, the tag needs to be initialized (unless -- compiling for the Java VM where tags are implicit). It is done -- late in the initialization process because in some cases, we call -- the init proc of an ancestor which will not leave out the right tag if Ancestor_Is_Expression then null; elsif Is_Tagged_Type (Typ) and then not Java_VM then Instr := Make_OK_Assignment_Statement (Loc, Name => Make_Selected_Component (Loc, Prefix => New_Copy_Tree (Target), Selector_Name => New_Reference_To (Tag_Component (Base_Type (Typ)), Loc)), Expression => Unchecked_Convert_To (RTE (RE_Tag), New_Reference_To (Access_Disp_Table (Base_Type (Typ)), Loc))); Append_To (L, Instr); end if; -- Now deal with the various controlled type data structure -- initializations if Present (Obj) and then Finalize_Storage_Only (Typ) and then (Is_Library_Level_Entity (Obj) or else Entity (Constant_Value (RTE (RE_Garbage_Collected))) = Standard_True) then Attach := Make_Integer_Literal (Loc, 0); elsif Nkind (Parent (N)) = N_Qualified_Expression and then Nkind (Parent (Parent (N))) = N_Allocator then Attach := Make_Integer_Literal (Loc, 2); else Attach := Make_Integer_Literal (Loc, 1); end if; -- Determine the external finalization list. It is either the -- finalization list of the outer-scope or the one coming from -- an outer aggregate. When the target is not a temporary, the -- proper scope is the scope of the target rather than the -- potentially transient current scope. if Controlled_Type (Typ) then if Present (Flist) then External_Final_List := New_Copy_Tree (Flist); elsif Is_Entity_Name (Target) and then Present (Scope (Entity (Target))) then External_Final_List := Find_Final_List (Scope (Entity (Target))); else External_Final_List := Find_Final_List (Current_Scope); end if; else External_Final_List := Empty; end if; -- Initialize and attach the outer object in the is_controlled case if Is_Controlled (Typ) then if Ancestor_Is_Subtype_Mark then Ref := Convert_To (Init_Typ, New_Copy_Tree (Target)); Set_Assignment_OK (Ref); Append_To (L, Make_Procedure_Call_Statement (Loc, Name => New_Reference_To ( Find_Prim_Op (Init_Typ, Name_Initialize), Loc), Parameter_Associations => New_List (New_Copy_Tree (Ref)))); end if; if not Has_Controlled_Component (Typ) then Ref := New_Copy_Tree (Target); Set_Assignment_OK (Ref); Append_To (Start_L, Make_Attach_Call ( Obj_Ref => Ref, Flist_Ref => New_Copy_Tree (External_Final_List), With_Attach => Attach)); end if; end if; -- In the Has_Controlled component case, all the intermediate -- controllers must be initialized if Has_Controlled_Component (Typ) and not Is_Limited_Ancestor_Expansion then declare Inner_Typ : Entity_Id; Outer_Typ : Entity_Id; At_Root : Boolean; begin Outer_Typ := Base_Type (Typ); -- Find outer type with a controller while Outer_Typ /= Init_Typ and then not Has_New_Controlled_Component (Outer_Typ) loop Outer_Typ := Etype (Outer_Typ); end loop; -- Attach it to the outer record controller to the -- external final list if Outer_Typ = Init_Typ then Append_List_To (Start_L, Init_Controller ( Target => Target, Typ => Outer_Typ, F => External_Final_List, Attach => Attach, Init_Pr => Ancestor_Is_Expression)); At_Root := True; Inner_Typ := Init_Typ; else Append_List_To (Start_L, Init_Controller ( Target => Target, Typ => Outer_Typ, F => External_Final_List, Attach => Attach, Init_Pr => True)); Inner_Typ := Etype (Outer_Typ); At_Root := not Is_Tagged_Type (Typ) or else Inner_Typ = Outer_Typ; end if; -- The outer object has to be attached as well if Is_Controlled (Typ) then Ref := New_Copy_Tree (Target); Set_Assignment_OK (Ref); Append_To (Start_L, Make_Attach_Call ( Obj_Ref => Ref, Flist_Ref => New_Copy_Tree (External_Final_List), With_Attach => New_Copy_Tree (Attach))); end if; -- Initialize the internal controllers for tagged types with -- more than one controller. while not At_Root and then Inner_Typ /= Init_Typ loop if Has_New_Controlled_Component (Inner_Typ) then F := Make_Selected_Component (Loc, Prefix => Convert_To (Outer_Typ, New_Copy_Tree (Target)), Selector_Name => Make_Identifier (Loc, Name_uController)); F := Make_Selected_Component (Loc, Prefix => F, Selector_Name => Make_Identifier (Loc, Name_F)); Append_List_To (Start_L, Init_Controller ( Target => Target, Typ => Inner_Typ, F => F, Attach => Make_Integer_Literal (Loc, 1), Init_Pr => True)); Outer_Typ := Inner_Typ; end if; -- Stop at the root At_Root := Inner_Typ = Etype (Inner_Typ); Inner_Typ := Etype (Inner_Typ); end loop; -- If not done yet attach the controller of the ancestor part if Outer_Typ /= Init_Typ and then Inner_Typ = Init_Typ and then Has_Controlled_Component (Init_Typ) then F := Make_Selected_Component (Loc, Prefix => Convert_To (Outer_Typ, New_Copy_Tree (Target)), Selector_Name => Make_Identifier (Loc, Name_uController)); F := Make_Selected_Component (Loc, Prefix => F, Selector_Name => Make_Identifier (Loc, Name_F)); Attach := Make_Integer_Literal (Loc, 1); Append_List_To (Start_L, Init_Controller ( Target => Target, Typ => Init_Typ, F => F, Attach => Attach, Init_Pr => Ancestor_Is_Expression)); end if; end; end if; Append_List_To (Start_L, L); return Start_L; end Build_Record_Aggr_Code; ------------------------------- -- Convert_Aggr_In_Allocator -- ------------------------------- procedure Convert_Aggr_In_Allocator (Decl, Aggr : Node_Id) is Loc : constant Source_Ptr := Sloc (Aggr); Typ : constant Entity_Id := Etype (Aggr); Temp : constant Entity_Id := Defining_Identifier (Decl); Occ : constant Node_Id := Unchecked_Convert_To (Typ, Make_Explicit_Dereference (Loc, New_Reference_To (Temp, Loc))); Access_Type : constant Entity_Id := Etype (Temp); begin if Is_Array_Type (Typ) then Convert_Array_Aggr_In_Allocator (Decl, Aggr, Occ); elsif Has_Default_Init_Comps (Aggr) then declare L : constant List_Id := New_List; Init_Stmts : List_Id; begin Init_Stmts := Late_Expansion (Aggr, Typ, Occ, Find_Final_List (Access_Type), Associated_Final_Chain (Base_Type (Access_Type))); Build_Task_Allocate_Block_With_Init_Stmts (L, Aggr, Init_Stmts); Insert_Actions_After (Decl, L); end; else Insert_Actions_After (Decl, Late_Expansion (Aggr, Typ, Occ, Find_Final_List (Access_Type), Associated_Final_Chain (Base_Type (Access_Type)))); end if; end Convert_Aggr_In_Allocator; -------------------------------- -- Convert_Aggr_In_Assignment -- -------------------------------- procedure Convert_Aggr_In_Assignment (N : Node_Id) is Aggr : Node_Id := Expression (N); Typ : constant Entity_Id := Etype (Aggr); Occ : constant Node_Id := New_Copy_Tree (Name (N)); begin if Nkind (Aggr) = N_Qualified_Expression then Aggr := Expression (Aggr); end if; Insert_Actions_After (N, Late_Expansion (Aggr, Typ, Occ, Find_Final_List (Typ, New_Copy_Tree (Occ)))); end Convert_Aggr_In_Assignment; --------------------------------- -- Convert_Aggr_In_Object_Decl -- --------------------------------- procedure Convert_Aggr_In_Object_Decl (N : Node_Id) is Obj : constant Entity_Id := Defining_Identifier (N); Aggr : Node_Id := Expression (N); Loc : constant Source_Ptr := Sloc (Aggr); Typ : constant Entity_Id := Etype (Aggr); Occ : constant Node_Id := New_Occurrence_Of (Obj, Loc); function Discriminants_Ok return Boolean; -- If the object type is constrained, the discriminants in the -- aggregate must be checked against the discriminants of the subtype. -- This cannot be done using Apply_Discriminant_Checks because after -- expansion there is no aggregate left to check. ---------------------- -- Discriminants_Ok -- ---------------------- function Discriminants_Ok return Boolean is Cond : Node_Id := Empty; Check : Node_Id; D : Entity_Id; Disc1 : Elmt_Id; Disc2 : Elmt_Id; Val1 : Node_Id; Val2 : Node_Id; begin D := First_Discriminant (Typ); Disc1 := First_Elmt (Discriminant_Constraint (Typ)); Disc2 := First_Elmt (Discriminant_Constraint (Etype (Obj))); while Present (Disc1) and then Present (Disc2) loop Val1 := Node (Disc1); Val2 := Node (Disc2); if not Is_OK_Static_Expression (Val1) or else not Is_OK_Static_Expression (Val2) then Check := Make_Op_Ne (Loc, Left_Opnd => Duplicate_Subexpr (Val1), Right_Opnd => Duplicate_Subexpr (Val2)); if No (Cond) then Cond := Check; else Cond := Make_Or_Else (Loc, Left_Opnd => Cond, Right_Opnd => Check); end if; elsif Expr_Value (Val1) /= Expr_Value (Val2) then Apply_Compile_Time_Constraint_Error (Aggr, Msg => "incorrect value for discriminant&?", Reason => CE_Discriminant_Check_Failed, Ent => D); return False; end if; Next_Discriminant (D); Next_Elmt (Disc1); Next_Elmt (Disc2); end loop; -- If any discriminant constraint is non-static, emit a check if Present (Cond) then Insert_Action (N, Make_Raise_Constraint_Error (Loc, Condition => Cond, Reason => CE_Discriminant_Check_Failed)); end if; return True; end Discriminants_Ok; -- Start of processing for Convert_Aggr_In_Object_Decl begin Set_Assignment_OK (Occ); if Nkind (Aggr) = N_Qualified_Expression then Aggr := Expression (Aggr); end if; if Has_Discriminants (Typ) and then Typ /= Etype (Obj) and then Is_Constrained (Etype (Obj)) and then not Discriminants_Ok then return; end if; Insert_Actions_After (N, Late_Expansion (Aggr, Typ, Occ, Obj => Obj)); Set_No_Initialization (N); Initialize_Discriminants (N, Typ); end Convert_Aggr_In_Object_Decl; ------------------------------------- -- Convert_array_Aggr_In_Allocator -- ------------------------------------- procedure Convert_Array_Aggr_In_Allocator (Decl : Node_Id; Aggr : Node_Id; Target : Node_Id) is Aggr_Code : List_Id; Typ : constant Entity_Id := Etype (Aggr); Ctyp : constant Entity_Id := Component_Type (Typ); begin -- The target is an explicit dereference of the allocated object. -- Generate component assignments to it, as for an aggregate that -- appears on the right-hand side of an assignment statement. Aggr_Code := Build_Array_Aggr_Code (Aggr, Ctype => Ctyp, Index => First_Index (Typ), Into => Target, Scalar_Comp => Is_Scalar_Type (Ctyp)); Insert_Actions_After (Decl, Aggr_Code); end Convert_Array_Aggr_In_Allocator; ---------------------------- -- Convert_To_Assignments -- ---------------------------- procedure Convert_To_Assignments (N : Node_Id; Typ : Entity_Id) is Loc : constant Source_Ptr := Sloc (N); Temp : Entity_Id; Instr : Node_Id; Target_Expr : Node_Id; Parent_Kind : Node_Kind; Unc_Decl : Boolean := False; Parent_Node : Node_Id; begin Parent_Node := Parent (N); Parent_Kind := Nkind (Parent_Node); if Parent_Kind = N_Qualified_Expression then -- Check if we are in a unconstrained declaration because in this -- case the current delayed expansion mechanism doesn't work when -- the declared object size depend on the initializing expr. begin Parent_Node := Parent (Parent_Node); Parent_Kind := Nkind (Parent_Node); if Parent_Kind = N_Object_Declaration then Unc_Decl := not Is_Entity_Name (Object_Definition (Parent_Node)) or else Has_Discriminants (Entity (Object_Definition (Parent_Node))) or else Is_Class_Wide_Type (Entity (Object_Definition (Parent_Node))); end if; end; end if; -- Just set the Delay flag in the following cases where the -- transformation will be done top down from above -- - internal aggregate (transformed when expanding the parent) -- - allocators (see Convert_Aggr_In_Allocator) -- - object decl (see Convert_Aggr_In_Object_Decl) -- - safe assignments (see Convert_Aggr_Assignments) -- so far only the assignments in the init procs are taken -- into account if Parent_Kind = N_Aggregate or else Parent_Kind = N_Extension_Aggregate or else Parent_Kind = N_Component_Association or else Parent_Kind = N_Allocator or else (Parent_Kind = N_Object_Declaration and then not Unc_Decl) or else (Parent_Kind = N_Assignment_Statement and then Inside_Init_Proc) then Set_Expansion_Delayed (N); return; end if; if Requires_Transient_Scope (Typ) then Establish_Transient_Scope (N, Sec_Stack => Is_Controlled (Typ) or else Has_Controlled_Component (Typ)); end if; -- Create the temporary Temp := Make_Defining_Identifier (Loc, New_Internal_Name ('A')); Instr := Make_Object_Declaration (Loc, Defining_Identifier => Temp, Object_Definition => New_Occurrence_Of (Typ, Loc)); Set_No_Initialization (Instr); Insert_Action (N, Instr); Initialize_Discriminants (Instr, Typ); Target_Expr := New_Occurrence_Of (Temp, Loc); Insert_Actions (N, Build_Record_Aggr_Code (N, Typ, Target_Expr)); Rewrite (N, New_Occurrence_Of (Temp, Loc)); Analyze_And_Resolve (N, Typ); end Convert_To_Assignments; --------------------------- -- Convert_To_Positional -- --------------------------- procedure Convert_To_Positional (N : Node_Id; Max_Others_Replicate : Nat := 5; Handle_Bit_Packed : Boolean := False) is Typ : constant Entity_Id := Etype (N); function Flatten (N : Node_Id; Ix : Node_Id; Ixb : Node_Id) return Boolean; -- Convert the aggregate into a purely positional form if possible function Is_Flat (N : Node_Id; Dims : Int) return Boolean; -- Return True iff the array N is flat (which is not rivial -- in the case of multidimensionsl aggregates). ------------- -- Flatten -- ------------- function Flatten (N : Node_Id; Ix : Node_Id; Ixb : Node_Id) return Boolean is Loc : constant Source_Ptr := Sloc (N); Blo : constant Node_Id := Type_Low_Bound (Etype (Ixb)); Lo : constant Node_Id := Type_Low_Bound (Etype (Ix)); Hi : constant Node_Id := Type_High_Bound (Etype (Ix)); Lov : Uint; Hiv : Uint; -- The following constant determines the maximum size of an -- aggregate produced by converting named to positional -- notation (e.g. from others clauses). This avoids running -- away with attempts to convert huge aggregates. -- The normal limit is 5000, but we increase this limit to -- 2**24 (about 16 million) if Restrictions (No_Elaboration_Code) -- or Restrictions (No_Implicit_Loops) is specified, since in -- either case, we are at risk of declaring the program illegal -- because of this limit. Max_Aggr_Size : constant Nat := 5000 + (2 ** 24 - 5000) * Boolean'Pos (Restriction_Active (No_Elaboration_Code) or else Restriction_Active (No_Implicit_Loops)); begin if Nkind (Original_Node (N)) = N_String_Literal then return True; end if; -- Bounds need to be known at compile time if not Compile_Time_Known_Value (Lo) or else not Compile_Time_Known_Value (Hi) then return False; end if; -- Get bounds and check reasonable size (positive, not too large) -- Also only handle bounds starting at the base type low bound -- for now since the compiler isn't able to handle different low -- bounds yet. Case such as new String'(3..5 => ' ') will get -- the wrong bounds, though it seems that the aggregate should -- retain the bounds set on its Etype (see C64103E and CC1311B). Lov := Expr_Value (Lo); Hiv := Expr_Value (Hi); if Hiv < Lov or else (Hiv - Lov > Max_Aggr_Size) or else not Compile_Time_Known_Value (Blo) or else (Lov /= Expr_Value (Blo)) then return False; end if; -- Bounds must be in integer range (for array Vals below) if not UI_Is_In_Int_Range (Lov) or else not UI_Is_In_Int_Range (Hiv) then return False; end if; -- Determine if set of alternatives is suitable for conversion -- and build an array containing the values in sequence. declare Vals : array (UI_To_Int (Lov) .. UI_To_Int (Hiv)) of Node_Id := (others => Empty); -- The values in the aggregate sorted appropriately Vlist : List_Id; -- Same data as Vals in list form Rep_Count : Nat; -- Used to validate Max_Others_Replicate limit Elmt : Node_Id; Num : Int := UI_To_Int (Lov); Choice : Node_Id; Lo, Hi : Node_Id; begin if Present (Expressions (N)) then Elmt := First (Expressions (N)); while Present (Elmt) loop if Nkind (Elmt) = N_Aggregate and then Present (Next_Index (Ix)) and then not Flatten (Elmt, Next_Index (Ix), Next_Index (Ixb)) then return False; end if; Vals (Num) := Relocate_Node (Elmt); Num := Num + 1; Next (Elmt); end loop; end if; if No (Component_Associations (N)) then return True; end if; Elmt := First (Component_Associations (N)); if Nkind (Expression (Elmt)) = N_Aggregate then if Present (Next_Index (Ix)) and then not Flatten (Expression (Elmt), Next_Index (Ix), Next_Index (Ixb)) then return False; end if; end if; Component_Loop : while Present (Elmt) loop Choice := First (Choices (Elmt)); Choice_Loop : while Present (Choice) loop -- If we have an others choice, fill in the missing elements -- subject to the limit established by Max_Others_Replicate. if Nkind (Choice) = N_Others_Choice then Rep_Count := 0; for J in Vals'Range loop if No (Vals (J)) then Vals (J) := New_Copy_Tree (Expression (Elmt)); Rep_Count := Rep_Count + 1; -- Check for maximum others replication. Note that -- we skip this test if either of the restrictions -- No_Elaboration_Code or No_Implicit_Loops is -- active, or if this is a preelaborable unit. declare P : constant Entity_Id := Cunit_Entity (Current_Sem_Unit); begin if Restriction_Active (No_Elaboration_Code) or else Restriction_Active (No_Implicit_Loops) or else Is_Preelaborated (P) or else (Ekind (P) = E_Package_Body and then Is_Preelaborated (Spec_Entity (P))) then null; elsif Rep_Count > Max_Others_Replicate then return False; end if; end; end if; end loop; exit Component_Loop; -- Case of a subtype mark elsif Nkind (Choice) = N_Identifier and then Is_Type (Entity (Choice)) then Lo := Type_Low_Bound (Etype (Choice)); Hi := Type_High_Bound (Etype (Choice)); -- Case of subtype indication elsif Nkind (Choice) = N_Subtype_Indication then Lo := Low_Bound (Range_Expression (Constraint (Choice))); Hi := High_Bound (Range_Expression (Constraint (Choice))); -- Case of a range elsif Nkind (Choice) = N_Range then Lo := Low_Bound (Choice); Hi := High_Bound (Choice); -- Normal subexpression case else pragma Assert (Nkind (Choice) in N_Subexpr); if not Compile_Time_Known_Value (Choice) then return False; else Vals (UI_To_Int (Expr_Value (Choice))) := New_Copy_Tree (Expression (Elmt)); goto Continue; end if; end if; -- Range cases merge with Lo,Hi said if not Compile_Time_Known_Value (Lo) or else not Compile_Time_Known_Value (Hi) then return False; else for J in UI_To_Int (Expr_Value (Lo)) .. UI_To_Int (Expr_Value (Hi)) loop Vals (J) := New_Copy_Tree (Expression (Elmt)); end loop; end if; <> Next (Choice); end loop Choice_Loop; Next (Elmt); end loop Component_Loop; -- If we get here the conversion is possible Vlist := New_List; for J in Vals'Range loop Append (Vals (J), Vlist); end loop; Rewrite (N, Make_Aggregate (Loc, Expressions => Vlist)); Set_Aggregate_Bounds (N, Aggregate_Bounds (Original_Node (N))); return True; end; end Flatten; ------------- -- Is_Flat -- ------------- function Is_Flat (N : Node_Id; Dims : Int) return Boolean is Elmt : Node_Id; begin if Dims = 0 then return True; elsif Nkind (N) = N_Aggregate then if Present (Component_Associations (N)) then return False; else Elmt := First (Expressions (N)); while Present (Elmt) loop if not Is_Flat (Elmt, Dims - 1) then return False; end if; Next (Elmt); end loop; return True; end if; else return True; end if; end Is_Flat; -- Start of processing for Convert_To_Positional begin -- Ada 2005 (AI-287): Do not convert in case of default initialized -- components because in this case will need to call the corresponding -- IP procedure. if Has_Default_Init_Comps (N) then return; end if; if Is_Flat (N, Number_Dimensions (Typ)) then return; end if; if Is_Bit_Packed_Array (Typ) and then not Handle_Bit_Packed then return; end if; -- Do not convert to positional if controlled components are -- involved since these require special processing if Has_Controlled_Component (Typ) then return; end if; if Flatten (N, First_Index (Typ), First_Index (Base_Type (Typ))) then Analyze_And_Resolve (N, Typ); end if; end Convert_To_Positional; ---------------------------- -- Expand_Array_Aggregate -- ---------------------------- -- Array aggregate expansion proceeds as follows: -- 1. If requested we generate code to perform all the array aggregate -- bound checks, specifically -- (a) Check that the index range defined by aggregate bounds is -- compatible with corresponding index subtype. -- (b) If an others choice is present check that no aggregate -- index is outside the bounds of the index constraint. -- (c) For multidimensional arrays make sure that all subaggregates -- corresponding to the same dimension have the same bounds. -- 2. Check for packed array aggregate which can be converted to a -- constant so that the aggregate disappeares completely. -- 3. Check case of nested aggregate. Generally nested aggregates are -- handled during the processing of the parent aggregate. -- 4. Check if the aggregate can be statically processed. If this is the -- case pass it as is to Gigi. Note that a necessary condition for -- static processing is that the aggregate be fully positional. -- 5. If in place aggregate expansion is possible (i.e. no need to create -- a temporary) then mark the aggregate as such and return. Otherwise -- create a new temporary and generate the appropriate initialization -- code. procedure Expand_Array_Aggregate (N : Node_Id) is Loc : constant Source_Ptr := Sloc (N); Typ : constant Entity_Id := Etype (N); Ctyp : constant Entity_Id := Component_Type (Typ); -- Typ is the correct constrained array subtype of the aggregate -- Ctyp is the corresponding component type. Aggr_Dimension : constant Pos := Number_Dimensions (Typ); -- Number of aggregate index dimensions Aggr_Low : array (1 .. Aggr_Dimension) of Node_Id; Aggr_High : array (1 .. Aggr_Dimension) of Node_Id; -- Low and High bounds of the constraint for each aggregate index Aggr_Index_Typ : array (1 .. Aggr_Dimension) of Entity_Id; -- The type of each index Maybe_In_Place_OK : Boolean; -- If the type is neither controlled nor packed and the aggregate -- is the expression in an assignment, assignment in place may be -- possible, provided other conditions are met on the LHS. Others_Present : array (1 .. Aggr_Dimension) of Boolean := (others => False); -- If Others_Present (J) is True, then there is an others choice -- in one of the sub-aggregates of N at dimension J. procedure Build_Constrained_Type (Positional : Boolean); -- If the subtype is not static or unconstrained, build a constrained -- type using the computable sizes of the aggregate and its sub- -- aggregates. procedure Check_Bounds (Aggr_Bounds : Node_Id; Index_Bounds : Node_Id); -- Checks that the bounds of Aggr_Bounds are within the bounds defined -- by Index_Bounds. procedure Check_Same_Aggr_Bounds (Sub_Aggr : Node_Id; Dim : Pos); -- Checks that in a multi-dimensional array aggregate all subaggregates -- corresponding to the same dimension have the same bounds. -- Sub_Aggr is an array sub-aggregate. Dim is the dimension -- corresponding to the sub-aggregate. procedure Compute_Others_Present (Sub_Aggr : Node_Id; Dim : Pos); -- Computes the values of array Others_Present. Sub_Aggr is the -- array sub-aggregate we start the computation from. Dim is the -- dimension corresponding to the sub-aggregate. function Has_Address_Clause (D : Node_Id) return Boolean; -- If the aggregate is the expression in an object declaration, it -- cannot be expanded in place. This function does a lookahead in the -- current declarative part to find an address clause for the object -- being declared. function In_Place_Assign_OK return Boolean; -- Simple predicate to determine whether an aggregate assignment can -- be done in place, because none of the new values can depend on the -- components of the target of the assignment. procedure Others_Check (Sub_Aggr : Node_Id; Dim : Pos); -- Checks that if an others choice is present in any sub-aggregate no -- aggregate index is outside the bounds of the index constraint. -- Sub_Aggr is an array sub-aggregate. Dim is the dimension -- corresponding to the sub-aggregate. ---------------------------- -- Build_Constrained_Type -- ---------------------------- procedure Build_Constrained_Type (Positional : Boolean) is Loc : constant Source_Ptr := Sloc (N); Agg_Type : Entity_Id; Comp : Node_Id; Decl : Node_Id; Typ : constant Entity_Id := Etype (N); Indices : constant List_Id := New_List; Num : Int; Sub_Agg : Node_Id; begin Agg_Type := Make_Defining_Identifier ( Loc, New_Internal_Name ('A')); -- If the aggregate is purely positional, all its subaggregates -- have the same size. We collect the dimensions from the first -- subaggregate at each level. if Positional then Sub_Agg := N; for D in 1 .. Number_Dimensions (Typ) loop Comp := First (Expressions (Sub_Agg)); Sub_Agg := Comp; Num := 0; while Present (Comp) loop Num := Num + 1; Next (Comp); end loop; Append ( Make_Range (Loc, Low_Bound => Make_Integer_Literal (Loc, 1), High_Bound => Make_Integer_Literal (Loc, Num)), Indices); end loop; else -- We know the aggregate type is unconstrained and the -- aggregate is not processable by the back end, therefore -- not necessarily positional. Retrieve the bounds of each -- dimension as computed earlier. for D in 1 .. Number_Dimensions (Typ) loop Append ( Make_Range (Loc, Low_Bound => Aggr_Low (D), High_Bound => Aggr_High (D)), Indices); end loop; end if; Decl := Make_Full_Type_Declaration (Loc, Defining_Identifier => Agg_Type, Type_Definition => Make_Constrained_Array_Definition (Loc, Discrete_Subtype_Definitions => Indices, Component_Definition => Make_Component_Definition (Loc, Aliased_Present => False, Subtype_Indication => New_Occurrence_Of (Component_Type (Typ), Loc)))); Insert_Action (N, Decl); Analyze (Decl); Set_Etype (N, Agg_Type); Set_Is_Itype (Agg_Type); Freeze_Itype (Agg_Type, N); end Build_Constrained_Type; ------------------ -- Check_Bounds -- ------------------ procedure Check_Bounds (Aggr_Bounds : Node_Id; Index_Bounds : Node_Id) is Aggr_Lo : Node_Id; Aggr_Hi : Node_Id; Ind_Lo : Node_Id; Ind_Hi : Node_Id; Cond : Node_Id := Empty; begin Get_Index_Bounds (Aggr_Bounds, Aggr_Lo, Aggr_Hi); Get_Index_Bounds (Index_Bounds, Ind_Lo, Ind_Hi); -- Generate the following test: -- -- [constraint_error when -- Aggr_Lo <= Aggr_Hi and then -- (Aggr_Lo < Ind_Lo or else Aggr_Hi > Ind_Hi)] -- -- As an optimization try to see if some tests are trivially vacuos -- because we are comparing an expression against itself. if Aggr_Lo = Ind_Lo and then Aggr_Hi = Ind_Hi then Cond := Empty; elsif Aggr_Hi = Ind_Hi then Cond := Make_Op_Lt (Loc, Left_Opnd => Duplicate_Subexpr_Move_Checks (Aggr_Lo), Right_Opnd => Duplicate_Subexpr_Move_Checks (Ind_Lo)); elsif Aggr_Lo = Ind_Lo then Cond := Make_Op_Gt (Loc, Left_Opnd => Duplicate_Subexpr_Move_Checks (Aggr_Hi), Right_Opnd => Duplicate_Subexpr_Move_Checks (Ind_Hi)); else Cond := Make_Or_Else (Loc, Left_Opnd => Make_Op_Lt (Loc, Left_Opnd => Duplicate_Subexpr_Move_Checks (Aggr_Lo), Right_Opnd => Duplicate_Subexpr_Move_Checks (Ind_Lo)), Right_Opnd => Make_Op_Gt (Loc, Left_Opnd => Duplicate_Subexpr (Aggr_Hi), Right_Opnd => Duplicate_Subexpr (Ind_Hi))); end if; if Present (Cond) then Cond := Make_And_Then (Loc, Left_Opnd => Make_Op_Le (Loc, Left_Opnd => Duplicate_Subexpr_Move_Checks (Aggr_Lo), Right_Opnd => Duplicate_Subexpr_Move_Checks (Aggr_Hi)), Right_Opnd => Cond); Set_Analyzed (Left_Opnd (Left_Opnd (Cond)), False); Set_Analyzed (Right_Opnd (Left_Opnd (Cond)), False); Insert_Action (N, Make_Raise_Constraint_Error (Loc, Condition => Cond, Reason => CE_Length_Check_Failed)); end if; end Check_Bounds; ---------------------------- -- Check_Same_Aggr_Bounds -- ---------------------------- procedure Check_Same_Aggr_Bounds (Sub_Aggr : Node_Id; Dim : Pos) is Sub_Lo : constant Node_Id := Low_Bound (Aggregate_Bounds (Sub_Aggr)); Sub_Hi : constant Node_Id := High_Bound (Aggregate_Bounds (Sub_Aggr)); -- The bounds of this specific sub-aggregate Aggr_Lo : constant Node_Id := Aggr_Low (Dim); Aggr_Hi : constant Node_Id := Aggr_High (Dim); -- The bounds of the aggregate for this dimension Ind_Typ : constant Entity_Id := Aggr_Index_Typ (Dim); -- The index type for this dimension.xxx Cond : Node_Id := Empty; Assoc : Node_Id; Expr : Node_Id; begin -- If index checks are on generate the test -- -- [constraint_error when -- Aggr_Lo /= Sub_Lo or else Aggr_Hi /= Sub_Hi] -- -- As an optimization try to see if some tests are trivially vacuos -- because we are comparing an expression against itself. Also for -- the first dimension the test is trivially vacuous because there -- is just one aggregate for dimension 1. if Index_Checks_Suppressed (Ind_Typ) then Cond := Empty; elsif Dim = 1 or else (Aggr_Lo = Sub_Lo and then Aggr_Hi = Sub_Hi) then Cond := Empty; elsif Aggr_Hi = Sub_Hi then Cond := Make_Op_Ne (Loc, Left_Opnd => Duplicate_Subexpr_Move_Checks (Aggr_Lo), Right_Opnd => Duplicate_Subexpr_Move_Checks (Sub_Lo)); elsif Aggr_Lo = Sub_Lo then Cond := Make_Op_Ne (Loc, Left_Opnd => Duplicate_Subexpr_Move_Checks (Aggr_Hi), Right_Opnd => Duplicate_Subexpr_Move_Checks (Sub_Hi)); else Cond := Make_Or_Else (Loc, Left_Opnd => Make_Op_Ne (Loc, Left_Opnd => Duplicate_Subexpr_Move_Checks (Aggr_Lo), Right_Opnd => Duplicate_Subexpr_Move_Checks (Sub_Lo)), Right_Opnd => Make_Op_Ne (Loc, Left_Opnd => Duplicate_Subexpr (Aggr_Hi), Right_Opnd => Duplicate_Subexpr (Sub_Hi))); end if; if Present (Cond) then Insert_Action (N, Make_Raise_Constraint_Error (Loc, Condition => Cond, Reason => CE_Length_Check_Failed)); end if; -- Now look inside the sub-aggregate to see if there is more work if Dim < Aggr_Dimension then -- Process positional components if Present (Expressions (Sub_Aggr)) then Expr := First (Expressions (Sub_Aggr)); while Present (Expr) loop Check_Same_Aggr_Bounds (Expr, Dim + 1); Next (Expr); end loop; end if; -- Process component associations if Present (Component_Associations (Sub_Aggr)) then Assoc := First (Component_Associations (Sub_Aggr)); while Present (Assoc) loop Expr := Expression (Assoc); Check_Same_Aggr_Bounds (Expr, Dim + 1); Next (Assoc); end loop; end if; end if; end Check_Same_Aggr_Bounds; ---------------------------- -- Compute_Others_Present -- ---------------------------- procedure Compute_Others_Present (Sub_Aggr : Node_Id; Dim : Pos) is Assoc : Node_Id; Expr : Node_Id; begin if Present (Component_Associations (Sub_Aggr)) then Assoc := Last (Component_Associations (Sub_Aggr)); if Nkind (First (Choices (Assoc))) = N_Others_Choice then Others_Present (Dim) := True; end if; end if; -- Now look inside the sub-aggregate to see if there is more work if Dim < Aggr_Dimension then -- Process positional components if Present (Expressions (Sub_Aggr)) then Expr := First (Expressions (Sub_Aggr)); while Present (Expr) loop Compute_Others_Present (Expr, Dim + 1); Next (Expr); end loop; end if; -- Process component associations if Present (Component_Associations (Sub_Aggr)) then Assoc := First (Component_Associations (Sub_Aggr)); while Present (Assoc) loop Expr := Expression (Assoc); Compute_Others_Present (Expr, Dim + 1); Next (Assoc); end loop; end if; end if; end Compute_Others_Present; ------------------------ -- Has_Address_Clause -- ------------------------ function Has_Address_Clause (D : Node_Id) return Boolean is Id : constant Entity_Id := Defining_Identifier (D); Decl : Node_Id := Next (D); begin while Present (Decl) loop if Nkind (Decl) = N_At_Clause and then Chars (Identifier (Decl)) = Chars (Id) then return True; elsif Nkind (Decl) = N_Attribute_Definition_Clause and then Chars (Decl) = Name_Address and then Chars (Name (Decl)) = Chars (Id) then return True; end if; Next (Decl); end loop; return False; end Has_Address_Clause; ------------------------ -- In_Place_Assign_OK -- ------------------------ function In_Place_Assign_OK return Boolean is Aggr_In : Node_Id; Aggr_Lo : Node_Id; Aggr_Hi : Node_Id; Obj_In : Node_Id; Obj_Lo : Node_Id; Obj_Hi : Node_Id; function Is_Others_Aggregate (Aggr : Node_Id) return Boolean; -- Aggregates that consist of a single Others choice are safe -- if the single expression is. function Safe_Aggregate (Aggr : Node_Id) return Boolean; -- Check recursively that each component of a (sub)aggregate does -- not depend on the variable being assigned to. function Safe_Component (Expr : Node_Id) return Boolean; -- Verify that an expression cannot depend on the variable being -- assigned to. Room for improvement here (but less than before). ------------------------- -- Is_Others_Aggregate -- ------------------------- function Is_Others_Aggregate (Aggr : Node_Id) return Boolean is begin return No (Expressions (Aggr)) and then Nkind (First (Choices (First (Component_Associations (Aggr))))) = N_Others_Choice; end Is_Others_Aggregate; -------------------- -- Safe_Aggregate -- -------------------- function Safe_Aggregate (Aggr : Node_Id) return Boolean is Expr : Node_Id; begin if Present (Expressions (Aggr)) then Expr := First (Expressions (Aggr)); while Present (Expr) loop if Nkind (Expr) = N_Aggregate then if not Safe_Aggregate (Expr) then return False; end if; elsif not Safe_Component (Expr) then return False; end if; Next (Expr); end loop; end if; if Present (Component_Associations (Aggr)) then Expr := First (Component_Associations (Aggr)); while Present (Expr) loop if Nkind (Expression (Expr)) = N_Aggregate then if not Safe_Aggregate (Expression (Expr)) then return False; end if; elsif not Safe_Component (Expression (Expr)) then return False; end if; Next (Expr); end loop; end if; return True; end Safe_Aggregate; -------------------- -- Safe_Component -- -------------------- function Safe_Component (Expr : Node_Id) return Boolean is Comp : Node_Id := Expr; function Check_Component (Comp : Node_Id) return Boolean; -- Do the recursive traversal, after copy --------------------- -- Check_Component -- --------------------- function Check_Component (Comp : Node_Id) return Boolean is begin if Is_Overloaded (Comp) then return False; end if; return Compile_Time_Known_Value (Comp) or else (Is_Entity_Name (Comp) and then Present (Entity (Comp)) and then No (Renamed_Object (Entity (Comp)))) or else (Nkind (Comp) = N_Attribute_Reference and then Check_Component (Prefix (Comp))) or else (Nkind (Comp) in N_Binary_Op and then Check_Component (Left_Opnd (Comp)) and then Check_Component (Right_Opnd (Comp))) or else (Nkind (Comp) in N_Unary_Op and then Check_Component (Right_Opnd (Comp))) or else (Nkind (Comp) = N_Selected_Component and then Check_Component (Prefix (Comp))) or else (Nkind (Comp) = N_Unchecked_Type_Conversion and then Check_Component (Expression (Comp))); end Check_Component; -- Start of processing for Safe_Component begin -- If the component appears in an association that may -- correspond to more than one element, it is not analyzed -- before the expansion into assignments, to avoid side effects. -- We analyze, but do not resolve the copy, to obtain sufficient -- entity information for the checks that follow. If component is -- overloaded we assume an unsafe function call. if not Analyzed (Comp) then if Is_Overloaded (Expr) then return False; elsif Nkind (Expr) = N_Aggregate and then not Is_Others_Aggregate (Expr) then return False; elsif Nkind (Expr) = N_Allocator then -- For now, too complex to analyze return False; end if; Comp := New_Copy_Tree (Expr); Set_Parent (Comp, Parent (Expr)); Analyze (Comp); end if; if Nkind (Comp) = N_Aggregate then return Safe_Aggregate (Comp); else return Check_Component (Comp); end if; end Safe_Component; -- Start of processing for In_Place_Assign_OK begin if Present (Component_Associations (N)) then -- On assignment, sliding can take place, so we cannot do the -- assignment in place unless the bounds of the aggregate are -- statically equal to those of the target. -- If the aggregate is given by an others choice, the bounds -- are derived from the left-hand side, and the assignment is -- safe if the expression is. if Is_Others_Aggregate (N) then return Safe_Component (Expression (First (Component_Associations (N)))); end if; Aggr_In := First_Index (Etype (N)); if Nkind (Parent (N)) = N_Assignment_Statement then Obj_In := First_Index (Etype (Name (Parent (N)))); else -- Context is an allocator. Check bounds of aggregate -- against given type in qualified expression. pragma Assert (Nkind (Parent (Parent (N))) = N_Allocator); Obj_In := First_Index (Etype (Entity (Subtype_Mark (Parent (N))))); end if; while Present (Aggr_In) loop Get_Index_Bounds (Aggr_In, Aggr_Lo, Aggr_Hi); Get_Index_Bounds (Obj_In, Obj_Lo, Obj_Hi); if not Compile_Time_Known_Value (Aggr_Lo) or else not Compile_Time_Known_Value (Aggr_Hi) or else not Compile_Time_Known_Value (Obj_Lo) or else not Compile_Time_Known_Value (Obj_Hi) or else Expr_Value (Aggr_Lo) /= Expr_Value (Obj_Lo) or else Expr_Value (Aggr_Hi) /= Expr_Value (Obj_Hi) then return False; end if; Next_Index (Aggr_In); Next_Index (Obj_In); end loop; end if; -- Now check the component values themselves return Safe_Aggregate (N); end In_Place_Assign_OK; ------------------ -- Others_Check -- ------------------ procedure Others_Check (Sub_Aggr : Node_Id; Dim : Pos) is Aggr_Lo : constant Node_Id := Aggr_Low (Dim); Aggr_Hi : constant Node_Id := Aggr_High (Dim); -- The bounds of the aggregate for this dimension Ind_Typ : constant Entity_Id := Aggr_Index_Typ (Dim); -- The index type for this dimension Need_To_Check : Boolean := False; Choices_Lo : Node_Id := Empty; Choices_Hi : Node_Id := Empty; -- The lowest and highest discrete choices for a named sub-aggregate Nb_Choices : Int := -1; -- The number of discrete non-others choices in this sub-aggregate Nb_Elements : Uint := Uint_0; -- The number of elements in a positional aggregate Cond : Node_Id := Empty; Assoc : Node_Id; Choice : Node_Id; Expr : Node_Id; begin -- Check if we have an others choice. If we do make sure that this -- sub-aggregate contains at least one element in addition to the -- others choice. if Range_Checks_Suppressed (Ind_Typ) then Need_To_Check := False; elsif Present (Expressions (Sub_Aggr)) and then Present (Component_Associations (Sub_Aggr)) then Need_To_Check := True; elsif Present (Component_Associations (Sub_Aggr)) then Assoc := Last (Component_Associations (Sub_Aggr)); if Nkind (First (Choices (Assoc))) /= N_Others_Choice then Need_To_Check := False; else -- Count the number of discrete choices. Start with -1 -- because the others choice does not count. Nb_Choices := -1; Assoc := First (Component_Associations (Sub_Aggr)); while Present (Assoc) loop Choice := First (Choices (Assoc)); while Present (Choice) loop Nb_Choices := Nb_Choices + 1; Next (Choice); end loop; Next (Assoc); end loop; -- If there is only an others choice nothing to do Need_To_Check := (Nb_Choices > 0); end if; else Need_To_Check := False; end if; -- If we are dealing with a positional sub-aggregate with an -- others choice then compute the number or positional elements. if Need_To_Check and then Present (Expressions (Sub_Aggr)) then Expr := First (Expressions (Sub_Aggr)); Nb_Elements := Uint_0; while Present (Expr) loop Nb_Elements := Nb_Elements + 1; Next (Expr); end loop; -- If the aggregate contains discrete choices and an others choice -- compute the smallest and largest discrete choice values. elsif Need_To_Check then Compute_Choices_Lo_And_Choices_Hi : declare Table : Case_Table_Type (1 .. Nb_Choices); -- Used to sort all the different choice values J : Pos := 1; Low : Node_Id; High : Node_Id; begin Assoc := First (Component_Associations (Sub_Aggr)); while Present (Assoc) loop Choice := First (Choices (Assoc)); while Present (Choice) loop if Nkind (Choice) = N_Others_Choice then exit; end if; Get_Index_Bounds (Choice, Low, High); Table (J).Choice_Lo := Low; Table (J).Choice_Hi := High; J := J + 1; Next (Choice); end loop; Next (Assoc); end loop; -- Sort the discrete choices Sort_Case_Table (Table); Choices_Lo := Table (1).Choice_Lo; Choices_Hi := Table (Nb_Choices).Choice_Hi; end Compute_Choices_Lo_And_Choices_Hi; end if; -- If no others choice in this sub-aggregate, or the aggregate -- comprises only an others choice, nothing to do. if not Need_To_Check then Cond := Empty; -- If we are dealing with an aggregate containing an others -- choice and positional components, we generate the following test: -- -- if Ind_Typ'Pos (Aggr_Lo) + (Nb_Elements - 1) > -- Ind_Typ'Pos (Aggr_Hi) -- then -- raise Constraint_Error; -- end if; elsif Nb_Elements > Uint_0 then Cond := Make_Op_Gt (Loc, Left_Opnd => Make_Op_Add (Loc, Left_Opnd => Make_Attribute_Reference (Loc, Prefix => New_Reference_To (Ind_Typ, Loc), Attribute_Name => Name_Pos, Expressions => New_List (Duplicate_Subexpr_Move_Checks (Aggr_Lo))), Right_Opnd => Make_Integer_Literal (Loc, Nb_Elements - 1)), Right_Opnd => Make_Attribute_Reference (Loc, Prefix => New_Reference_To (Ind_Typ, Loc), Attribute_Name => Name_Pos, Expressions => New_List ( Duplicate_Subexpr_Move_Checks (Aggr_Hi)))); -- If we are dealing with an aggregate containing an others -- choice and discrete choices we generate the following test: -- -- [constraint_error when -- Choices_Lo < Aggr_Lo or else Choices_Hi > Aggr_Hi]; else Cond := Make_Or_Else (Loc, Left_Opnd => Make_Op_Lt (Loc, Left_Opnd => Duplicate_Subexpr_Move_Checks (Choices_Lo), Right_Opnd => Duplicate_Subexpr_Move_Checks (Aggr_Lo)), Right_Opnd => Make_Op_Gt (Loc, Left_Opnd => Duplicate_Subexpr (Choices_Hi), Right_Opnd => Duplicate_Subexpr (Aggr_Hi))); end if; if Present (Cond) then Insert_Action (N, Make_Raise_Constraint_Error (Loc, Condition => Cond, Reason => CE_Length_Check_Failed)); end if; -- Now look inside the sub-aggregate to see if there is more work if Dim < Aggr_Dimension then -- Process positional components if Present (Expressions (Sub_Aggr)) then Expr := First (Expressions (Sub_Aggr)); while Present (Expr) loop Others_Check (Expr, Dim + 1); Next (Expr); end loop; end if; -- Process component associations if Present (Component_Associations (Sub_Aggr)) then Assoc := First (Component_Associations (Sub_Aggr)); while Present (Assoc) loop Expr := Expression (Assoc); Others_Check (Expr, Dim + 1); Next (Assoc); end loop; end if; end if; end Others_Check; -- Remaining Expand_Array_Aggregate variables Tmp : Entity_Id; -- Holds the temporary aggregate value Tmp_Decl : Node_Id; -- Holds the declaration of Tmp Aggr_Code : List_Id; Parent_Node : Node_Id; Parent_Kind : Node_Kind; -- Start of processing for Expand_Array_Aggregate begin -- Do not touch the special aggregates of attributes used for Asm calls if Is_RTE (Ctyp, RE_Asm_Input_Operand) or else Is_RTE (Ctyp, RE_Asm_Output_Operand) then return; end if; -- If the semantic analyzer has determined that aggregate N will raise -- Constraint_Error at run-time, then the aggregate node has been -- replaced with an N_Raise_Constraint_Error node and we should -- never get here. pragma Assert (not Raises_Constraint_Error (N)); -- STEP 1a -- Check that the index range defined by aggregate bounds is -- compatible with corresponding index subtype. Index_Compatibility_Check : declare Aggr_Index_Range : Node_Id := First_Index (Typ); -- The current aggregate index range Index_Constraint : Node_Id := First_Index (Etype (Typ)); -- The corresponding index constraint against which we have to -- check the above aggregate index range. begin Compute_Others_Present (N, 1); for J in 1 .. Aggr_Dimension loop -- There is no need to emit a check if an others choice is -- present for this array aggregate dimension since in this -- case one of N's sub-aggregates has taken its bounds from the -- context and these bounds must have been checked already. In -- addition all sub-aggregates corresponding to the same -- dimension must all have the same bounds (checked in (c) below). if not Range_Checks_Suppressed (Etype (Index_Constraint)) and then not Others_Present (J) then -- We don't use Checks.Apply_Range_Check here because it -- emits a spurious check. Namely it checks that the range -- defined by the aggregate bounds is non empty. But we know -- this already if we get here. Check_Bounds (Aggr_Index_Range, Index_Constraint); end if; -- Save the low and high bounds of the aggregate index as well -- as the index type for later use in checks (b) and (c) below. Aggr_Low (J) := Low_Bound (Aggr_Index_Range); Aggr_High (J) := High_Bound (Aggr_Index_Range); Aggr_Index_Typ (J) := Etype (Index_Constraint); Next_Index (Aggr_Index_Range); Next_Index (Index_Constraint); end loop; end Index_Compatibility_Check; -- STEP 1b -- If an others choice is present check that no aggregate -- index is outside the bounds of the index constraint. Others_Check (N, 1); -- STEP 1c -- For multidimensional arrays make sure that all subaggregates -- corresponding to the same dimension have the same bounds. if Aggr_Dimension > 1 then Check_Same_Aggr_Bounds (N, 1); end if; -- STEP 2 -- Here we test for is packed array aggregate that we can handle -- at compile time. If so, return with transformation done. Note -- that we do this even if the aggregate is nested, because once -- we have done this processing, there is no more nested aggregate! if Packed_Array_Aggregate_Handled (N) then return; end if; -- At this point we try to convert to positional form Convert_To_Positional (N); -- if the result is no longer an aggregate (e.g. it may be a string -- literal, or a temporary which has the needed value), then we are -- done, since there is no longer a nested aggregate. if Nkind (N) /= N_Aggregate then return; -- We are also done if the result is an analyzed aggregate -- This case could use more comments ??? elsif Analyzed (N) and then N /= Original_Node (N) then return; end if; -- Now see if back end processing is possible if Backend_Processing_Possible (N) then -- If the aggregate is static but the constraints are not, build -- a static subtype for the aggregate, so that Gigi can place it -- in static memory. Perform an unchecked_conversion to the non- -- static type imposed by the context. declare Itype : constant Entity_Id := Etype (N); Index : Node_Id; Needs_Type : Boolean := False; begin Index := First_Index (Itype); while Present (Index) loop if not Is_Static_Subtype (Etype (Index)) then Needs_Type := True; exit; else Next_Index (Index); end if; end loop; if Needs_Type then Build_Constrained_Type (Positional => True); Rewrite (N, Unchecked_Convert_To (Itype, N)); Analyze (N); end if; end; return; end if; -- STEP 3 -- Delay expansion for nested aggregates it will be taken care of -- when the parent aggregate is expanded Parent_Node := Parent (N); Parent_Kind := Nkind (Parent_Node); if Parent_Kind = N_Qualified_Expression then Parent_Node := Parent (Parent_Node); Parent_Kind := Nkind (Parent_Node); end if; if Parent_Kind = N_Aggregate or else Parent_Kind = N_Extension_Aggregate or else Parent_Kind = N_Component_Association or else (Parent_Kind = N_Object_Declaration and then Controlled_Type (Typ)) or else (Parent_Kind = N_Assignment_Statement and then Inside_Init_Proc) then Set_Expansion_Delayed (N); return; end if; -- STEP 4 -- Look if in place aggregate expansion is possible -- For object declarations we build the aggregate in place, unless -- the array is bit-packed or the component is controlled. -- For assignments we do the assignment in place if all the component -- associations have compile-time known values. For other cases we -- create a temporary. The analysis for safety of on-line assignment -- is delicate, i.e. we don't know how to do it fully yet ??? -- For allocators we assign to the designated object in place if the -- aggregate meets the same conditions as other in-place assignments. -- In this case the aggregate may not come from source but was created -- for default initialization, e.g. with Initialize_Scalars. if Requires_Transient_Scope (Typ) then Establish_Transient_Scope (N, Sec_Stack => Has_Controlled_Component (Typ)); end if; if Has_Default_Init_Comps (N) then Maybe_In_Place_OK := False; elsif Is_Bit_Packed_Array (Typ) or else Has_Controlled_Component (Typ) then Maybe_In_Place_OK := False; else Maybe_In_Place_OK := (Nkind (Parent (N)) = N_Assignment_Statement and then Comes_From_Source (N) and then In_Place_Assign_OK) or else (Nkind (Parent (Parent (N))) = N_Allocator and then In_Place_Assign_OK); end if; if not Has_Default_Init_Comps (N) and then Comes_From_Source (Parent (N)) and then Nkind (Parent (N)) = N_Object_Declaration and then not Must_Slide (Etype (Defining_Identifier (Parent (N))), Typ) and then N = Expression (Parent (N)) and then not Is_Bit_Packed_Array (Typ) and then not Has_Controlled_Component (Typ) and then not Has_Address_Clause (Parent (N)) then Tmp := Defining_Identifier (Parent (N)); Set_No_Initialization (Parent (N)); Set_Expression (Parent (N), Empty); -- Set the type of the entity, for use in the analysis of the -- subsequent indexed assignments. If the nominal type is not -- constrained, build a subtype from the known bounds of the -- aggregate. If the declaration has a subtype mark, use it, -- otherwise use the itype of the aggregate. if not Is_Constrained (Typ) then Build_Constrained_Type (Positional => False); elsif Is_Entity_Name (Object_Definition (Parent (N))) and then Is_Constrained (Entity (Object_Definition (Parent (N)))) then Set_Etype (Tmp, Entity (Object_Definition (Parent (N)))); else Set_Size_Known_At_Compile_Time (Typ, False); Set_Etype (Tmp, Typ); end if; elsif Maybe_In_Place_OK and then Nkind (Parent (N)) = N_Qualified_Expression and then Nkind (Parent (Parent (N))) = N_Allocator then Set_Expansion_Delayed (N); return; -- In the remaining cases the aggregate is the RHS of an assignment elsif Maybe_In_Place_OK and then Is_Entity_Name (Name (Parent (N))) then Tmp := Entity (Name (Parent (N))); if Etype (Tmp) /= Etype (N) then Apply_Length_Check (N, Etype (Tmp)); if Nkind (N) = N_Raise_Constraint_Error then -- Static error, nothing further to expand return; end if; end if; elsif Maybe_In_Place_OK and then Nkind (Name (Parent (N))) = N_Explicit_Dereference and then Is_Entity_Name (Prefix (Name (Parent (N)))) then Tmp := Name (Parent (N)); if Etype (Tmp) /= Etype (N) then Apply_Length_Check (N, Etype (Tmp)); end if; elsif Maybe_In_Place_OK and then Nkind (Name (Parent (N))) = N_Slice and then Safe_Slice_Assignment (N) then -- Safe_Slice_Assignment rewrites assignment as a loop return; -- Step 5 -- In place aggregate expansion is not possible else Maybe_In_Place_OK := False; Tmp := Make_Defining_Identifier (Loc, New_Internal_Name ('A')); Tmp_Decl := Make_Object_Declaration (Loc, Defining_Identifier => Tmp, Object_Definition => New_Occurrence_Of (Typ, Loc)); Set_No_Initialization (Tmp_Decl, True); -- If we are within a loop, the temporary will be pushed on the -- stack at each iteration. If the aggregate is the expression for -- an allocator, it will be immediately copied to the heap and can -- be reclaimed at once. We create a transient scope around the -- aggregate for this purpose. if Ekind (Current_Scope) = E_Loop and then Nkind (Parent (Parent (N))) = N_Allocator then Establish_Transient_Scope (N, False); end if; Insert_Action (N, Tmp_Decl); end if; -- Construct and insert the aggregate code. We can safely suppress -- index checks because this code is guaranteed not to raise CE -- on index checks. However we should *not* suppress all checks. declare Target : Node_Id; begin if Nkind (Tmp) = N_Defining_Identifier then Target := New_Reference_To (Tmp, Loc); else if Has_Default_Init_Comps (N) then -- Ada 2005 (AI-287): This case has not been analyzed??? raise Program_Error; end if; -- Name in assignment is explicit dereference Target := New_Copy (Tmp); end if; Aggr_Code := Build_Array_Aggr_Code (N, Ctype => Ctyp, Index => First_Index (Typ), Into => Target, Scalar_Comp => Is_Scalar_Type (Ctyp)); end; if Comes_From_Source (Tmp) then Insert_Actions_After (Parent (N), Aggr_Code); else Insert_Actions (N, Aggr_Code); end if; -- If the aggregate has been assigned in place, remove the original -- assignment. if Nkind (Parent (N)) = N_Assignment_Statement and then Maybe_In_Place_OK then Rewrite (Parent (N), Make_Null_Statement (Loc)); elsif Nkind (Parent (N)) /= N_Object_Declaration or else Tmp /= Defining_Identifier (Parent (N)) then Rewrite (N, New_Occurrence_Of (Tmp, Loc)); Analyze_And_Resolve (N, Typ); end if; end Expand_Array_Aggregate; ------------------------ -- Expand_N_Aggregate -- ------------------------ procedure Expand_N_Aggregate (N : Node_Id) is begin if Is_Record_Type (Etype (N)) then Expand_Record_Aggregate (N); else Expand_Array_Aggregate (N); end if; exception when RE_Not_Available => return; end Expand_N_Aggregate; ---------------------------------- -- Expand_N_Extension_Aggregate -- ---------------------------------- -- If the ancestor part is an expression, add a component association for -- the parent field. If the type of the ancestor part is not the direct -- parent of the expected type, build recursively the needed ancestors. -- If the ancestor part is a subtype_mark, replace aggregate with a decla- -- ration for a temporary of the expected type, followed by individual -- assignments to the given components. procedure Expand_N_Extension_Aggregate (N : Node_Id) is Loc : constant Source_Ptr := Sloc (N); A : constant Node_Id := Ancestor_Part (N); Typ : constant Entity_Id := Etype (N); begin -- If the ancestor is a subtype mark, an init proc must be called -- on the resulting object which thus has to be materialized in -- the front-end if Is_Entity_Name (A) and then Is_Type (Entity (A)) then Convert_To_Assignments (N, Typ); -- The extension aggregate is transformed into a record aggregate -- of the following form (c1 and c2 are inherited components) -- (Exp with c3 => a, c4 => b) -- ==> (c1 => Exp.c1, c2 => Exp.c2, c1 => a, c2 => b) else Set_Etype (N, Typ); -- No tag is needed in the case of Java_VM if Java_VM then Expand_Record_Aggregate (N, Parent_Expr => A); else Expand_Record_Aggregate (N, Orig_Tag => New_Occurrence_Of (Access_Disp_Table (Typ), Loc), Parent_Expr => A); end if; end if; exception when RE_Not_Available => return; end Expand_N_Extension_Aggregate; ----------------------------- -- Expand_Record_Aggregate -- ----------------------------- procedure Expand_Record_Aggregate (N : Node_Id; Orig_Tag : Node_Id := Empty; Parent_Expr : Node_Id := Empty) is Loc : constant Source_Ptr := Sloc (N); Comps : constant List_Id := Component_Associations (N); Typ : constant Entity_Id := Etype (N); Base_Typ : constant Entity_Id := Base_Type (Typ); function Has_Delayed_Nested_Aggregate_Or_Tagged_Comps return Boolean; -- Checks the presence of a nested aggregate which needs Late_Expansion -- or the presence of tagged components which may need tag adjustment. -------------------------------------------------- -- Has_Delayed_Nested_Aggregate_Or_Tagged_Comps -- -------------------------------------------------- function Has_Delayed_Nested_Aggregate_Or_Tagged_Comps return Boolean is C : Node_Id; Expr_Q : Node_Id; begin if No (Comps) then return False; end if; C := First (Comps); while Present (C) loop if Nkind (Expression (C)) = N_Qualified_Expression then Expr_Q := Expression (Expression (C)); else Expr_Q := Expression (C); end if; -- Return true if the aggregate has any associations for -- tagged components that may require tag adjustment. -- These are cases where the source expression may have -- a tag that could differ from the component tag (e.g., -- can occur for type conversions and formal parameters). -- (Tag adjustment is not needed if Java_VM because object -- tags are implicit in the JVM.) if Is_Tagged_Type (Etype (Expr_Q)) and then (Nkind (Expr_Q) = N_Type_Conversion or else (Is_Entity_Name (Expr_Q) and then Ekind (Entity (Expr_Q)) in Formal_Kind)) and then not Java_VM then return True; end if; if Is_Delayed_Aggregate (Expr_Q) then return True; end if; Next (C); end loop; return False; end Has_Delayed_Nested_Aggregate_Or_Tagged_Comps; -- Remaining Expand_Record_Aggregate variables Tag_Value : Node_Id; Comp : Entity_Id; New_Comp : Node_Id; -- Start of processing for Expand_Record_Aggregate begin -- If the aggregate is to be assigned to an atomic variable, we -- have to prevent a piecemeal assignment even if the aggregate -- is to be expanded. We create a temporary for the aggregate, and -- assign the temporary instead, so that the back end can generate -- an atomic move for it. if Is_Atomic (Typ) and then (Nkind (Parent (N)) = N_Object_Declaration or else Nkind (Parent (N)) = N_Assignment_Statement) and then Comes_From_Source (Parent (N)) then Expand_Atomic_Aggregate (N, Typ); return; end if; -- Gigi doesn't handle properly temporaries of variable size -- so we generate it in the front-end if not Size_Known_At_Compile_Time (Typ) then Convert_To_Assignments (N, Typ); -- Temporaries for controlled aggregates need to be attached to a -- final chain in order to be properly finalized, so it has to -- be created in the front-end elsif Is_Controlled (Typ) or else Has_Controlled_Component (Base_Type (Typ)) then Convert_To_Assignments (N, Typ); -- Ada 2005 (AI-287): In case of default initialized components we -- convert the aggregate into assignments. elsif Has_Default_Init_Comps (N) then Convert_To_Assignments (N, Typ); elsif Has_Delayed_Nested_Aggregate_Or_Tagged_Comps then Convert_To_Assignments (N, Typ); -- If an ancestor is private, some components are not inherited and -- we cannot expand into a record aggregate elsif Has_Private_Ancestor (Typ) then Convert_To_Assignments (N, Typ); -- ??? The following was done to compile fxacc00.ads in the ACVCs. Gigi -- is not able to handle the aggregate for Late_Request. elsif Is_Tagged_Type (Typ) and then Has_Discriminants (Typ) then Convert_To_Assignments (N, Typ); -- If some components are mutable, the size of the aggregate component -- may be disctinct from the default size of the type component, so -- we need to expand to insure that the back-end copies the proper -- size of the data. elsif Has_Mutable_Components (Typ) then Convert_To_Assignments (N, Typ); -- If the type involved has any non-bit aligned components, then -- we are not sure that the back end can handle this case correctly. elsif Type_May_Have_Bit_Aligned_Components (Typ) then Convert_To_Assignments (N, Typ); -- In all other cases we generate a proper aggregate that -- can be handled by gigi. else -- If no discriminants, nothing special to do if not Has_Discriminants (Typ) then null; -- Case of discriminants present elsif Is_Derived_Type (Typ) then -- For untagged types, non-stored discriminants are replaced -- with stored discriminants, which are the ones that gigi uses -- to describe the type and its components. Generate_Aggregate_For_Derived_Type : declare Constraints : constant List_Id := New_List; First_Comp : Node_Id; Discriminant : Entity_Id; Decl : Node_Id; Num_Disc : Int := 0; Num_Gird : Int := 0; procedure Prepend_Stored_Values (T : Entity_Id); -- Scan the list of stored discriminants of the type, and -- add their values to the aggregate being built. --------------------------- -- Prepend_Stored_Values -- --------------------------- procedure Prepend_Stored_Values (T : Entity_Id) is begin Discriminant := First_Stored_Discriminant (T); while Present (Discriminant) loop New_Comp := Make_Component_Association (Loc, Choices => New_List (New_Occurrence_Of (Discriminant, Loc)), Expression => New_Copy_Tree ( Get_Discriminant_Value ( Discriminant, Typ, Discriminant_Constraint (Typ)))); if No (First_Comp) then Prepend_To (Component_Associations (N), New_Comp); else Insert_After (First_Comp, New_Comp); end if; First_Comp := New_Comp; Next_Stored_Discriminant (Discriminant); end loop; end Prepend_Stored_Values; -- Start of processing for Generate_Aggregate_For_Derived_Type begin -- Remove the associations for the discriminant of -- the derived type. First_Comp := First (Component_Associations (N)); while Present (First_Comp) loop Comp := First_Comp; Next (First_Comp); if Ekind (Entity (First (Choices (Comp)))) = E_Discriminant then Remove (Comp); Num_Disc := Num_Disc + 1; end if; end loop; -- Insert stored discriminant associations in the correct -- order. If there are more stored discriminants than new -- discriminants, there is at least one new discriminant -- that constrains more than one of the stored discriminants. -- In this case we need to construct a proper subtype of -- the parent type, in order to supply values to all the -- components. Otherwise there is one-one correspondence -- between the constraints and the stored discriminants. First_Comp := Empty; Discriminant := First_Stored_Discriminant (Base_Type (Typ)); while Present (Discriminant) loop Num_Gird := Num_Gird + 1; Next_Stored_Discriminant (Discriminant); end loop; -- Case of more stored discriminants than new discriminants if Num_Gird > Num_Disc then -- Create a proper subtype of the parent type, which is -- the proper implementation type for the aggregate, and -- convert it to the intended target type. Discriminant := First_Stored_Discriminant (Base_Type (Typ)); while Present (Discriminant) loop New_Comp := New_Copy_Tree ( Get_Discriminant_Value ( Discriminant, Typ, Discriminant_Constraint (Typ))); Append (New_Comp, Constraints); Next_Stored_Discriminant (Discriminant); end loop; Decl := Make_Subtype_Declaration (Loc, Defining_Identifier => Make_Defining_Identifier (Loc, New_Internal_Name ('T')), Subtype_Indication => Make_Subtype_Indication (Loc, Subtype_Mark => New_Occurrence_Of (Etype (Base_Type (Typ)), Loc), Constraint => Make_Index_Or_Discriminant_Constraint (Loc, Constraints))); Insert_Action (N, Decl); Prepend_Stored_Values (Base_Type (Typ)); Set_Etype (N, Defining_Identifier (Decl)); Set_Analyzed (N); Rewrite (N, Unchecked_Convert_To (Typ, N)); Analyze (N); -- Case where we do not have fewer new discriminants than -- stored discriminants, so in this case we can simply -- use the stored discriminants of the subtype. else Prepend_Stored_Values (Typ); end if; end Generate_Aggregate_For_Derived_Type; end if; if Is_Tagged_Type (Typ) then -- The tagged case, _parent and _tag component must be created -- Reset null_present unconditionally. tagged records always have -- at least one field (the tag or the parent) Set_Null_Record_Present (N, False); -- When the current aggregate comes from the expansion of an -- extension aggregate, the parent expr is replaced by an -- aggregate formed by selected components of this expr if Present (Parent_Expr) and then Is_Empty_List (Comps) then Comp := First_Entity (Typ); while Present (Comp) loop -- Skip all entities that aren't discriminants or components if Ekind (Comp) /= E_Discriminant and then Ekind (Comp) /= E_Component then null; -- Skip all expander-generated components elsif not Comes_From_Source (Original_Record_Component (Comp)) then null; else New_Comp := Make_Selected_Component (Loc, Prefix => Unchecked_Convert_To (Typ, Duplicate_Subexpr (Parent_Expr, True)), Selector_Name => New_Occurrence_Of (Comp, Loc)); Append_To (Comps, Make_Component_Association (Loc, Choices => New_List (New_Occurrence_Of (Comp, Loc)), Expression => New_Comp)); Analyze_And_Resolve (New_Comp, Etype (Comp)); end if; Next_Entity (Comp); end loop; end if; -- Compute the value for the Tag now, if the type is a root it -- will be included in the aggregate right away, otherwise it will -- be propagated to the parent aggregate if Present (Orig_Tag) then Tag_Value := Orig_Tag; elsif Java_VM then Tag_Value := Empty; else Tag_Value := New_Occurrence_Of (Access_Disp_Table (Typ), Loc); end if; -- For a derived type, an aggregate for the parent is formed with -- all the inherited components. if Is_Derived_Type (Typ) then declare First_Comp : Node_Id; Parent_Comps : List_Id; Parent_Aggr : Node_Id; Parent_Name : Node_Id; begin -- Remove the inherited component association from the -- aggregate and store them in the parent aggregate First_Comp := First (Component_Associations (N)); Parent_Comps := New_List; while Present (First_Comp) and then Scope (Original_Record_Component ( Entity (First (Choices (First_Comp))))) /= Base_Typ loop Comp := First_Comp; Next (First_Comp); Remove (Comp); Append (Comp, Parent_Comps); end loop; Parent_Aggr := Make_Aggregate (Loc, Component_Associations => Parent_Comps); Set_Etype (Parent_Aggr, Etype (Base_Type (Typ))); -- Find the _parent component Comp := First_Component (Typ); while Chars (Comp) /= Name_uParent loop Comp := Next_Component (Comp); end loop; Parent_Name := New_Occurrence_Of (Comp, Loc); -- Insert the parent aggregate Prepend_To (Component_Associations (N), Make_Component_Association (Loc, Choices => New_List (Parent_Name), Expression => Parent_Aggr)); -- Expand recursively the parent propagating the right Tag Expand_Record_Aggregate ( Parent_Aggr, Tag_Value, Parent_Expr); end; -- For a root type, the tag component is added (unless compiling -- for the Java VM, where tags are implicit). elsif not Java_VM then declare Tag_Name : constant Node_Id := New_Occurrence_Of (Tag_Component (Typ), Loc); Typ_Tag : constant Entity_Id := RTE (RE_Tag); Conv_Node : constant Node_Id := Unchecked_Convert_To (Typ_Tag, Tag_Value); begin Set_Etype (Conv_Node, Typ_Tag); Prepend_To (Component_Associations (N), Make_Component_Association (Loc, Choices => New_List (Tag_Name), Expression => Conv_Node)); end; end if; end if; end if; end Expand_Record_Aggregate; ---------------------------- -- Has_Default_Init_Comps -- ---------------------------- function Has_Default_Init_Comps (N : Node_Id) return Boolean is Comps : constant List_Id := Component_Associations (N); C : Node_Id; Expr : Node_Id; begin pragma Assert (Nkind (N) = N_Aggregate or else Nkind (N) = N_Extension_Aggregate); if No (Comps) then return False; end if; -- Check if any direct component has default initialized components C := First (Comps); while Present (C) loop if Box_Present (C) then return True; end if; Next (C); end loop; -- Recursive call in case of aggregate expression C := First (Comps); while Present (C) loop Expr := Expression (C); if Present (Expr) and then (Nkind (Expr) = N_Aggregate or else Nkind (Expr) = N_Extension_Aggregate) and then Has_Default_Init_Comps (Expr) then return True; end if; Next (C); end loop; return False; end Has_Default_Init_Comps; -------------------------- -- Is_Delayed_Aggregate -- -------------------------- function Is_Delayed_Aggregate (N : Node_Id) return Boolean is Node : Node_Id := N; Kind : Node_Kind := Nkind (Node); begin if Kind = N_Qualified_Expression then Node := Expression (Node); Kind := Nkind (Node); end if; if Kind /= N_Aggregate and then Kind /= N_Extension_Aggregate then return False; else return Expansion_Delayed (Node); end if; end Is_Delayed_Aggregate; -------------------- -- Late_Expansion -- -------------------- function Late_Expansion (N : Node_Id; Typ : Entity_Id; Target : Node_Id; Flist : Node_Id := Empty; Obj : Entity_Id := Empty) return List_Id is begin if Is_Record_Type (Etype (N)) then return Build_Record_Aggr_Code (N, Typ, Target, Flist, Obj); else pragma Assert (Is_Array_Type (Etype (N))); return Build_Array_Aggr_Code (N => N, Ctype => Component_Type (Etype (N)), Index => First_Index (Typ), Into => Target, Scalar_Comp => Is_Scalar_Type (Component_Type (Typ)), Indices => No_List, Flist => Flist); end if; end Late_Expansion; ---------------------------------- -- Make_OK_Assignment_Statement -- ---------------------------------- function Make_OK_Assignment_Statement (Sloc : Source_Ptr; Name : Node_Id; Expression : Node_Id) return Node_Id is begin Set_Assignment_OK (Name); return Make_Assignment_Statement (Sloc, Name, Expression); end Make_OK_Assignment_Statement; ----------------------- -- Number_Of_Choices -- ----------------------- function Number_Of_Choices (N : Node_Id) return Nat is Assoc : Node_Id; Choice : Node_Id; Nb_Choices : Nat := 0; begin if Present (Expressions (N)) then return 0; end if; Assoc := First (Component_Associations (N)); while Present (Assoc) loop Choice := First (Choices (Assoc)); while Present (Choice) loop if Nkind (Choice) /= N_Others_Choice then Nb_Choices := Nb_Choices + 1; end if; Next (Choice); end loop; Next (Assoc); end loop; return Nb_Choices; end Number_Of_Choices; ------------------------------------ -- Packed_Array_Aggregate_Handled -- ------------------------------------ -- The current version of this procedure will handle at compile time -- any array aggregate that meets these conditions: -- One dimensional, bit packed -- Underlying packed type is modular type -- Bounds are within 32-bit Int range -- All bounds and values are static function Packed_Array_Aggregate_Handled (N : Node_Id) return Boolean is Loc : constant Source_Ptr := Sloc (N); Typ : constant Entity_Id := Etype (N); Ctyp : constant Entity_Id := Component_Type (Typ); Not_Handled : exception; -- Exception raised if this aggregate cannot be handled begin -- For now, handle only one dimensional bit packed arrays if not Is_Bit_Packed_Array (Typ) or else Number_Dimensions (Typ) > 1 or else not Is_Modular_Integer_Type (Packed_Array_Type (Typ)) then return False; end if; declare Csiz : constant Nat := UI_To_Int (Component_Size (Typ)); Lo : Node_Id; Hi : Node_Id; -- Bounds of index type Lob : Uint; Hib : Uint; -- Values of bounds if compile time known function Get_Component_Val (N : Node_Id) return Uint; -- Given a expression value N of the component type Ctyp, returns -- A value of Csiz (component size) bits representing this value. -- If the value is non-static or any other reason exists why the -- value cannot be returned, then Not_Handled is raised. ----------------------- -- Get_Component_Val -- ----------------------- function Get_Component_Val (N : Node_Id) return Uint is Val : Uint; begin -- We have to analyze the expression here before doing any further -- processing here. The analysis of such expressions is deferred -- till expansion to prevent some problems of premature analysis. Analyze_And_Resolve (N, Ctyp); -- Must have a compile time value. String literals have to -- be converted into temporaries as well, because they cannot -- easily be converted into their bit representation. if not Compile_Time_Known_Value (N) or else Nkind (N) = N_String_Literal then raise Not_Handled; end if; Val := Expr_Rep_Value (N); -- Adjust for bias, and strip proper number of bits if Has_Biased_Representation (Ctyp) then Val := Val - Expr_Value (Type_Low_Bound (Ctyp)); end if; return Val mod Uint_2 ** Csiz; end Get_Component_Val; -- Here we know we have a one dimensional bit packed array begin Get_Index_Bounds (First_Index (Typ), Lo, Hi); -- Cannot do anything if bounds are dynamic if not Compile_Time_Known_Value (Lo) or else not Compile_Time_Known_Value (Hi) then return False; end if; -- Or are silly out of range of int bounds Lob := Expr_Value (Lo); Hib := Expr_Value (Hi); if not UI_Is_In_Int_Range (Lob) or else not UI_Is_In_Int_Range (Hib) then return False; end if; -- At this stage we have a suitable aggregate for handling -- at compile time (the only remaining checks, are that the -- values of expressions in the aggregate are compile time -- known (check performed by Get_Component_Val), and that -- any subtypes or ranges are statically known. -- If the aggregate is not fully positional at this stage, -- then convert it to positional form. Either this will fail, -- in which case we can do nothing, or it will succeed, in -- which case we have succeeded in handling the aggregate, -- or it will stay an aggregate, in which case we have failed -- to handle this case. if Present (Component_Associations (N)) then Convert_To_Positional (N, Max_Others_Replicate => 64, Handle_Bit_Packed => True); return Nkind (N) /= N_Aggregate; end if; -- Otherwise we are all positional, so convert to proper value declare Lov : constant Int := UI_To_Int (Lob); Hiv : constant Int := UI_To_Int (Hib); Len : constant Nat := Int'Max (0, Hiv - Lov + 1); -- The length of the array (number of elements) Aggregate_Val : Uint; -- Value of aggregate. The value is set in the low order -- bits of this value. For the little-endian case, the -- values are stored from low-order to high-order and -- for the big-endian case the values are stored from -- high-order to low-order. Note that gigi will take care -- of the conversions to left justify the value in the big -- endian case (because of left justified modular type -- processing), so we do not have to worry about that here. Lit : Node_Id; -- Integer literal for resulting constructed value Shift : Nat; -- Shift count from low order for next value Incr : Int; -- Shift increment for loop Expr : Node_Id; -- Next expression from positional parameters of aggregate begin -- For little endian, we fill up the low order bits of the -- target value. For big endian we fill up the high order -- bits of the target value (which is a left justified -- modular value). if Bytes_Big_Endian xor Debug_Flag_8 then Shift := Csiz * (Len - 1); Incr := -Csiz; else Shift := 0; Incr := +Csiz; end if; -- Loop to set the values if Len = 0 then Aggregate_Val := Uint_0; else Expr := First (Expressions (N)); Aggregate_Val := Get_Component_Val (Expr) * Uint_2 ** Shift; for J in 2 .. Len loop Shift := Shift + Incr; Next (Expr); Aggregate_Val := Aggregate_Val + Get_Component_Val (Expr) * Uint_2 ** Shift; end loop; end if; -- Now we can rewrite with the proper value Lit := Make_Integer_Literal (Loc, Intval => Aggregate_Val); Set_Print_In_Hex (Lit); -- Construct the expression using this literal. Note that it is -- important to qualify the literal with its proper modular type -- since universal integer does not have the required range and -- also this is a left justified modular type, which is important -- in the big-endian case. Rewrite (N, Unchecked_Convert_To (Typ, Make_Qualified_Expression (Loc, Subtype_Mark => New_Occurrence_Of (Packed_Array_Type (Typ), Loc), Expression => Lit))); Analyze_And_Resolve (N, Typ); return True; end; end; exception when Not_Handled => return False; end Packed_Array_Aggregate_Handled; ---------------------------- -- Has_Mutable_Components -- ---------------------------- function Has_Mutable_Components (Typ : Entity_Id) return Boolean is Comp : Entity_Id; begin Comp := First_Component (Typ); while Present (Comp) loop if Is_Record_Type (Etype (Comp)) and then Has_Discriminants (Etype (Comp)) and then not Is_Constrained (Etype (Comp)) then return True; end if; Next_Component (Comp); end loop; return False; end Has_Mutable_Components; ------------------------------ -- Initialize_Discriminants -- ------------------------------ procedure Initialize_Discriminants (N : Node_Id; Typ : Entity_Id) is Loc : constant Source_Ptr := Sloc (N); Bas : constant Entity_Id := Base_Type (Typ); Par : constant Entity_Id := Etype (Bas); Decl : constant Node_Id := Parent (Par); Ref : Node_Id; begin if Is_Tagged_Type (Bas) and then Is_Derived_Type (Bas) and then Has_Discriminants (Par) and then Has_Discriminants (Bas) and then Number_Discriminants (Bas) /= Number_Discriminants (Par) and then Nkind (Decl) = N_Full_Type_Declaration and then Nkind (Type_Definition (Decl)) = N_Record_Definition and then Present (Variant_Part (Component_List (Type_Definition (Decl)))) and then Nkind (N) /= N_Extension_Aggregate then -- Call init proc to set discriminants. -- There should eventually be a special procedure for this ??? Ref := New_Reference_To (Defining_Identifier (N), Loc); Insert_Actions_After (N, Build_Initialization_Call (Sloc (N), Ref, Typ)); end if; end Initialize_Discriminants; ---------------- -- Must_Slide -- ---------------- function Must_Slide (Obj_Type : Entity_Id; Typ : Entity_Id) return Boolean is L1, L2, H1, H2 : Node_Id; begin -- No sliding if the type of the object is not established yet, if -- it is an unconstrained type whose actual subtype comes from the -- aggregate, or if the two types are identical. if not Is_Array_Type (Obj_Type) then return False; elsif not Is_Constrained (Obj_Type) then return False; elsif Typ = Obj_Type then return False; else -- Sliding can only occur along the first dimension Get_Index_Bounds (First_Index (Typ), L1, H1); Get_Index_Bounds (First_Index (Obj_Type), L2, H2); if not Is_Static_Expression (L1) or else not Is_Static_Expression (L2) or else not Is_Static_Expression (H1) or else not Is_Static_Expression (H2) then return False; else return Expr_Value (L1) /= Expr_Value (L2) or else Expr_Value (H1) /= Expr_Value (H2); end if; end if; end Must_Slide; --------------------------- -- Safe_Slice_Assignment -- --------------------------- function Safe_Slice_Assignment (N : Node_Id) return Boolean is Loc : constant Source_Ptr := Sloc (Parent (N)); Pref : constant Node_Id := Prefix (Name (Parent (N))); Range_Node : constant Node_Id := Discrete_Range (Name (Parent (N))); Expr : Node_Id; L_J : Entity_Id; L_Iter : Node_Id; L_Body : Node_Id; Stat : Node_Id; begin -- Generate: for J in Range loop Pref (J) := Expr; end loop; if Comes_From_Source (N) and then No (Expressions (N)) and then Nkind (First (Choices (First (Component_Associations (N))))) = N_Others_Choice then Expr := Expression (First (Component_Associations (N))); L_J := Make_Defining_Identifier (Loc, New_Internal_Name ('J')); L_Iter := Make_Iteration_Scheme (Loc, Loop_Parameter_Specification => Make_Loop_Parameter_Specification (Loc, Defining_Identifier => L_J, Discrete_Subtype_Definition => Relocate_Node (Range_Node))); L_Body := Make_Assignment_Statement (Loc, Name => Make_Indexed_Component (Loc, Prefix => Relocate_Node (Pref), Expressions => New_List (New_Occurrence_Of (L_J, Loc))), Expression => Relocate_Node (Expr)); -- Construct the final loop Stat := Make_Implicit_Loop_Statement (Node => Parent (N), Identifier => Empty, Iteration_Scheme => L_Iter, Statements => New_List (L_Body)); -- Set type of aggregate to be type of lhs in assignment, -- to suppress redundant length checks. Set_Etype (N, Etype (Name (Parent (N)))); Rewrite (Parent (N), Stat); Analyze (Parent (N)); return True; else return False; end if; end Safe_Slice_Assignment; --------------------- -- Sort_Case_Table -- --------------------- procedure Sort_Case_Table (Case_Table : in out Case_Table_Type) is L : constant Int := Case_Table'First; U : constant Int := Case_Table'Last; K : Int; J : Int; T : Case_Bounds; begin K := L; while K /= U loop T := Case_Table (K + 1); J := K + 1; while J /= L and then Expr_Value (Case_Table (J - 1).Choice_Lo) > Expr_Value (T.Choice_Lo) loop Case_Table (J) := Case_Table (J - 1); J := J - 1; end loop; Case_Table (J) := T; K := K + 1; end loop; end Sort_Case_Table; end Exp_Aggr;