------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- E X P _ I N T R -- -- -- -- B o d y -- -- -- -- Copyright (C) 1992-2015, Free Software Foundation, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 3, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- -- for more details. You should have received a copy of the GNU General -- -- Public License distributed with GNAT; see file COPYING3. If not, go to -- -- http://www.gnu.org/licenses for a complete copy of the license. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ with Atree; use Atree; with Checks; use Checks; with Einfo; use Einfo; with Elists; use Elists; with Errout; use Errout; with Expander; use Expander; with Exp_Atag; use Exp_Atag; with Exp_Ch4; use Exp_Ch4; with Exp_Ch7; use Exp_Ch7; with Exp_Ch11; use Exp_Ch11; with Exp_Code; use Exp_Code; with Exp_Fixd; use Exp_Fixd; with Exp_Util; use Exp_Util; with Freeze; use Freeze; with Inline; use Inline; with Nmake; use Nmake; with Nlists; use Nlists; with Opt; use Opt; with Restrict; use Restrict; with Rident; use Rident; with Rtsfind; use Rtsfind; with Sem; use Sem; with Sem_Aux; use Sem_Aux; with Sem_Eval; use Sem_Eval; with Sem_Res; use Sem_Res; with Sem_Type; use Sem_Type; with Sem_Util; use Sem_Util; with Sinfo; use Sinfo; with Sinput; use Sinput; with Snames; use Snames; with Stand; use Stand; with Stringt; use Stringt; with Tbuild; use Tbuild; with Uintp; use Uintp; with Urealp; use Urealp; package body Exp_Intr is ----------------------- -- Local Subprograms -- ----------------------- procedure Expand_Binary_Operator_Call (N : Node_Id); -- Expand a call to an intrinsic arithmetic operator when the operand -- types or sizes are not identical. procedure Expand_Is_Negative (N : Node_Id); -- Expand a call to the intrinsic Is_Negative function procedure Expand_Dispatching_Constructor_Call (N : Node_Id); -- Expand a call to an instantiation of Generic_Dispatching_Constructor -- into a dispatching call to the actual subprogram associated with the -- Constructor formal subprogram, passing it the Parameters actual of -- the call to the instantiation and dispatching based on call's Tag -- parameter. procedure Expand_Exception_Call (N : Node_Id; Ent : RE_Id); -- Expand a call to Exception_Information/Message/Name. The first -- parameter, N, is the node for the function call, and Ent is the -- entity for the corresponding routine in the Ada.Exceptions package. procedure Expand_Import_Call (N : Node_Id); -- Expand a call to Import_Address/Longest_Integer/Value. The parameter -- N is the node for the function call. procedure Expand_Shift (N : Node_Id; E : Entity_Id; K : Node_Kind); -- Expand an intrinsic shift operation, N and E are from the call to -- Expand_Intrinsic_Call (call node and subprogram spec entity) and -- K is the kind for the shift node procedure Expand_Unc_Conversion (N : Node_Id; E : Entity_Id); -- Expand a call to an instantiation of Unchecked_Conversion into a node -- N_Unchecked_Type_Conversion. procedure Expand_Unc_Deallocation (N : Node_Id); -- Expand a call to an instantiation of Unchecked_Deallocation into a node -- N_Free_Statement and appropriate context. procedure Expand_To_Address (N : Node_Id); procedure Expand_To_Pointer (N : Node_Id); -- Expand a call to corresponding function, declared in an instance of -- System.Address_To_Access_Conversions. procedure Expand_Source_Info (N : Node_Id; Nam : Name_Id); -- Rewrite the node by the appropriate string or positive constant. -- Nam can be one of the following: -- Name_File - expand string name of source file -- Name_Line - expand integer line number -- Name_Source_Location - expand string of form file:line -- Name_Enclosing_Entity - expand string name of enclosing entity -- Name_Compilation_Date - expand string with compilation date -- Name_Compilation_Time - expand string with compilation time procedure Write_Entity_Name (E : Entity_Id); -- Recursive procedure to construct string for qualified name of enclosing -- program unit. The qualification stops at an enclosing scope has no -- source name (block or loop). If entity is a subprogram instance, skip -- enclosing wrapper package. The name is appended to the current contents -- of Name_Buffer, incrementing Name_Len. --------------------- -- Add_Source_Info -- --------------------- procedure Add_Source_Info (Loc : Source_Ptr; Nam : Name_Id) is Ent : Entity_Id; Save_NB : constant String := Name_Buffer (1 .. Name_Len); Save_NL : constant Natural := Name_Len; -- Save current Name_Buffer contents begin Name_Len := 0; -- Line case Nam is when Name_Line => Add_Nat_To_Name_Buffer (Nat (Get_Logical_Line_Number (Loc))); when Name_File => Get_Decoded_Name_String (Reference_Name (Get_Source_File_Index (Loc))); when Name_Source_Location => Build_Location_String (Loc); when Name_Enclosing_Entity => -- Skip enclosing blocks to reach enclosing unit Ent := Current_Scope; while Present (Ent) loop exit when not Ekind_In (Ent, E_Block, E_Loop); Ent := Scope (Ent); end loop; -- Ent now points to the relevant defining entity Write_Entity_Name (Ent); when Name_Compilation_Date => declare subtype S13 is String (1 .. 3); Months : constant array (1 .. 12) of S13 := ("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"); M1 : constant Character := Opt.Compilation_Time (6); M2 : constant Character := Opt.Compilation_Time (7); MM : constant Natural range 1 .. 12 := (Character'Pos (M1) - Character'Pos ('0')) * 10 + (Character'Pos (M2) - Character'Pos ('0')); begin -- Reformat ISO date into MMM DD YYYY (__DATE__) format Name_Buffer (1 .. 3) := Months (MM); Name_Buffer (4) := ' '; Name_Buffer (5 .. 6) := Opt.Compilation_Time (9 .. 10); Name_Buffer (7) := ' '; Name_Buffer (8 .. 11) := Opt.Compilation_Time (1 .. 4); Name_Len := 11; end; when Name_Compilation_Time => Name_Buffer (1 .. 8) := Opt.Compilation_Time (12 .. 19); Name_Len := 8; when others => raise Program_Error; end case; -- Prepend original Name_Buffer contents Name_Buffer (Save_NL + 1 .. Save_NL + Name_Len) := Name_Buffer (1 .. Name_Len); Name_Buffer (1 .. Save_NL) := Save_NB; Name_Len := Name_Len + Save_NL; end Add_Source_Info; --------------------------------- -- Expand_Binary_Operator_Call -- --------------------------------- procedure Expand_Binary_Operator_Call (N : Node_Id) is T1 : constant Entity_Id := Underlying_Type (Etype (Left_Opnd (N))); T2 : constant Entity_Id := Underlying_Type (Etype (Right_Opnd (N))); TR : constant Entity_Id := Etype (N); T3 : Entity_Id; Res : Node_Id; Siz : constant Uint := UI_Max (RM_Size (T1), RM_Size (T2)); -- Maximum of operand sizes begin -- Nothing to do if the operands have the same modular type if Base_Type (T1) = Base_Type (T2) and then Is_Modular_Integer_Type (T1) then return; end if; -- Use Unsigned_32 for sizes of 32 or below, else Unsigned_64 if Siz > 32 then T3 := RTE (RE_Unsigned_64); else T3 := RTE (RE_Unsigned_32); end if; -- Copy operator node, and reset type and entity fields, for -- subsequent reanalysis. Res := New_Copy (N); Set_Etype (Res, T3); case Nkind (N) is when N_Op_And => Set_Entity (Res, Standard_Op_And); when N_Op_Or => Set_Entity (Res, Standard_Op_Or); when N_Op_Xor => Set_Entity (Res, Standard_Op_Xor); when others => raise Program_Error; end case; -- Convert operands to large enough intermediate type Set_Left_Opnd (Res, Unchecked_Convert_To (T3, Relocate_Node (Left_Opnd (N)))); Set_Right_Opnd (Res, Unchecked_Convert_To (T3, Relocate_Node (Right_Opnd (N)))); -- Analyze and resolve result formed by conversion to target type Rewrite (N, Unchecked_Convert_To (TR, Res)); Analyze_And_Resolve (N, TR); end Expand_Binary_Operator_Call; ----------------------------------------- -- Expand_Dispatching_Constructor_Call -- ----------------------------------------- -- Transform a call to an instantiation of Generic_Dispatching_Constructor -- of the form: -- GDC_Instance (The_Tag, Parameters'Access) -- to a class-wide conversion of a dispatching call to the actual -- associated with the formal subprogram Construct, designating The_Tag -- as the controlling tag of the call: -- T'Class (Construct'Actual (Params)) -- Controlling tag is The_Tag -- which will eventually be expanded to the following: -- T'Class (The_Tag.all (Construct'Actual'Index).all (Params)) -- A class-wide membership test is also generated, preceding the call, to -- ensure that the controlling tag denotes a type in T'Class. procedure Expand_Dispatching_Constructor_Call (N : Node_Id) is Loc : constant Source_Ptr := Sloc (N); Tag_Arg : constant Node_Id := First_Actual (N); Param_Arg : constant Node_Id := Next_Actual (Tag_Arg); Subp_Decl : constant Node_Id := Parent (Parent (Entity (Name (N)))); Inst_Pkg : constant Node_Id := Parent (Subp_Decl); Act_Rename : Node_Id; Act_Constr : Entity_Id; Iface_Tag : Node_Id := Empty; Cnstr_Call : Node_Id; Result_Typ : Entity_Id; begin -- Remove side effects from tag argument early, before rewriting -- the dispatching constructor call, as Remove_Side_Effects relies -- on Tag_Arg's Parent link properly attached to the tree (once the -- call is rewritten, the Parent is inconsistent as it points to the -- rewritten node, which is not the syntactic parent of the Tag_Arg -- anymore). Remove_Side_Effects (Tag_Arg); -- Check that we have a proper tag Insert_Action (N, Make_Implicit_If_Statement (N, Condition => Make_Op_Eq (Loc, Left_Opnd => New_Copy_Tree (Tag_Arg), Right_Opnd => New_Occurrence_Of (RTE (RE_No_Tag), Loc)), Then_Statements => New_List ( Make_Raise_Statement (Loc, New_Occurrence_Of (RTE (RE_Tag_Error), Loc))))); -- Check that it is not the tag of an abstract type Insert_Action (N, Make_Implicit_If_Statement (N, Condition => Make_Function_Call (Loc, Name => New_Occurrence_Of (RTE (RE_Type_Is_Abstract), Loc), Parameter_Associations => New_List (New_Copy_Tree (Tag_Arg))), Then_Statements => New_List ( Make_Raise_Statement (Loc, New_Occurrence_Of (RTE (RE_Tag_Error), Loc))))); -- The subprogram is the third actual in the instantiation, and is -- retrieved from the corresponding renaming declaration. However, -- freeze nodes may appear before, so we retrieve the declaration -- with an explicit loop. Act_Rename := First (Visible_Declarations (Inst_Pkg)); while Nkind (Act_Rename) /= N_Subprogram_Renaming_Declaration loop Next (Act_Rename); end loop; Act_Constr := Entity (Name (Act_Rename)); Result_Typ := Class_Wide_Type (Etype (Act_Constr)); -- Check that the accessibility level of the tag is no deeper than that -- of the constructor function. Insert_Action (N, Make_Implicit_If_Statement (N, Condition => Make_Op_Gt (Loc, Left_Opnd => Build_Get_Access_Level (Loc, New_Copy_Tree (Tag_Arg)), Right_Opnd => Make_Integer_Literal (Loc, Scope_Depth (Act_Constr))), Then_Statements => New_List ( Make_Raise_Statement (Loc, New_Occurrence_Of (RTE (RE_Tag_Error), Loc))))); if Is_Interface (Etype (Act_Constr)) then -- If the result type is not known to be a parent of Tag_Arg then we -- need to locate the tag of the secondary dispatch table. if not Is_Ancestor (Etype (Result_Typ), Etype (Tag_Arg), Use_Full_View => True) and then Tagged_Type_Expansion then -- Obtain the reference to the Ada.Tags service before generating -- the Object_Declaration node to ensure that if this service is -- not available in the runtime then we generate a clear error. declare Fname : constant Node_Id := New_Occurrence_Of (RTE (RE_Secondary_Tag), Loc); begin pragma Assert (not Is_Interface (Etype (Tag_Arg))); -- The tag is the first entry in the dispatch table of the -- return type of the constructor. Iface_Tag := Make_Object_Declaration (Loc, Defining_Identifier => Make_Temporary (Loc, 'V'), Object_Definition => New_Occurrence_Of (RTE (RE_Tag), Loc), Expression => Make_Function_Call (Loc, Name => Fname, Parameter_Associations => New_List ( Relocate_Node (Tag_Arg), New_Occurrence_Of (Node (First_Elmt (Access_Disp_Table (Etype (Act_Constr)))), Loc)))); Insert_Action (N, Iface_Tag); end; end if; end if; -- Create the call to the actual Constructor function Cnstr_Call := Make_Function_Call (Loc, Name => New_Occurrence_Of (Act_Constr, Loc), Parameter_Associations => New_List (Relocate_Node (Param_Arg))); -- Establish its controlling tag from the tag passed to the instance -- The tag may be given by a function call, in which case a temporary -- should be generated now, to prevent out-of-order insertions during -- the expansion of that call when stack-checking is enabled. if Present (Iface_Tag) then Set_Controlling_Argument (Cnstr_Call, New_Occurrence_Of (Defining_Identifier (Iface_Tag), Loc)); else Set_Controlling_Argument (Cnstr_Call, Relocate_Node (Tag_Arg)); end if; -- Rewrite and analyze the call to the instance as a class-wide -- conversion of the call to the actual constructor. Rewrite (N, Convert_To (Result_Typ, Cnstr_Call)); -- Do not generate a run-time check on the built object if tag -- checks are suppressed for the result type or tagged type expansion -- is disabled. if Tag_Checks_Suppressed (Etype (Result_Typ)) or else not Tagged_Type_Expansion then null; -- Generate a class-wide membership test to ensure that the call's tag -- argument denotes a type within the class. We must keep separate the -- case in which the Result_Type of the constructor function is a tagged -- type from the case in which it is an abstract interface because the -- run-time subprogram required to check these cases differ (and have -- one difference in their parameters profile). -- Call CW_Membership if the Result_Type is a tagged type to look for -- the tag in the table of ancestor tags. elsif not Is_Interface (Result_Typ) then declare Obj_Tag_Node : Node_Id := New_Copy_Tree (Tag_Arg); CW_Test_Node : Node_Id; begin Build_CW_Membership (Loc, Obj_Tag_Node => Obj_Tag_Node, Typ_Tag_Node => New_Occurrence_Of ( Node (First_Elmt (Access_Disp_Table ( Root_Type (Result_Typ)))), Loc), Related_Nod => N, New_Node => CW_Test_Node); Insert_Action (N, Make_Implicit_If_Statement (N, Condition => Make_Op_Not (Loc, CW_Test_Node), Then_Statements => New_List (Make_Raise_Statement (Loc, New_Occurrence_Of (RTE (RE_Tag_Error), Loc))))); end; -- Call IW_Membership test if the Result_Type is an abstract interface -- to look for the tag in the table of interface tags. else Insert_Action (N, Make_Implicit_If_Statement (N, Condition => Make_Op_Not (Loc, Make_Function_Call (Loc, Name => New_Occurrence_Of (RTE (RE_IW_Membership), Loc), Parameter_Associations => New_List ( Make_Attribute_Reference (Loc, Prefix => New_Copy_Tree (Tag_Arg), Attribute_Name => Name_Address), New_Occurrence_Of ( Node (First_Elmt (Access_Disp_Table ( Root_Type (Result_Typ)))), Loc)))), Then_Statements => New_List ( Make_Raise_Statement (Loc, Name => New_Occurrence_Of (RTE (RE_Tag_Error), Loc))))); end if; Analyze_And_Resolve (N, Etype (Act_Constr)); end Expand_Dispatching_Constructor_Call; --------------------------- -- Expand_Exception_Call -- --------------------------- -- If the function call is not within an exception handler, then the call -- is replaced by a null string. Otherwise the appropriate routine in -- Ada.Exceptions is called passing the choice parameter specification -- from the enclosing handler. If the enclosing handler lacks a choice -- parameter, then one is supplied. procedure Expand_Exception_Call (N : Node_Id; Ent : RE_Id) is Loc : constant Source_Ptr := Sloc (N); P : Node_Id; E : Entity_Id; begin -- Climb up parents to see if we are in exception handler P := Parent (N); loop -- Case of not in exception handler, replace by null string if No (P) then Rewrite (N, Make_String_Literal (Loc, Strval => "")); exit; -- Case of in exception handler elsif Nkind (P) = N_Exception_Handler then -- Handler cannot be used for a local raise, and furthermore, this -- is a violation of the No_Exception_Propagation restriction. Set_Local_Raise_Not_OK (P); Check_Restriction (No_Exception_Propagation, N); -- If no choice parameter present, then put one there. Note that -- we do not need to put it on the entity chain, since no one will -- be referencing it by normal visibility methods. if No (Choice_Parameter (P)) then E := Make_Temporary (Loc, 'E'); Set_Choice_Parameter (P, E); Set_Ekind (E, E_Variable); Set_Etype (E, RTE (RE_Exception_Occurrence)); Set_Scope (E, Current_Scope); end if; Rewrite (N, Make_Function_Call (Loc, Name => New_Occurrence_Of (RTE (Ent), Loc), Parameter_Associations => New_List ( New_Occurrence_Of (Choice_Parameter (P), Loc)))); exit; -- Keep climbing else P := Parent (P); end if; end loop; Analyze_And_Resolve (N, Standard_String); end Expand_Exception_Call; ------------------------ -- Expand_Import_Call -- ------------------------ -- The function call must have a static string as its argument. We create -- a dummy variable which uses this string as the external name in an -- Import pragma. The result is then obtained as the address of this -- dummy variable, converted to the appropriate target type. procedure Expand_Import_Call (N : Node_Id) is Loc : constant Source_Ptr := Sloc (N); Ent : constant Entity_Id := Entity (Name (N)); Str : constant Node_Id := First_Actual (N); Dum : constant Entity_Id := Make_Temporary (Loc, 'D'); begin Insert_Actions (N, New_List ( Make_Object_Declaration (Loc, Defining_Identifier => Dum, Object_Definition => New_Occurrence_Of (Standard_Character, Loc)), Make_Pragma (Loc, Chars => Name_Import, Pragma_Argument_Associations => New_List ( Make_Pragma_Argument_Association (Loc, Expression => Make_Identifier (Loc, Name_Ada)), Make_Pragma_Argument_Association (Loc, Expression => Make_Identifier (Loc, Chars (Dum))), Make_Pragma_Argument_Association (Loc, Chars => Name_Link_Name, Expression => Relocate_Node (Str)))))); Rewrite (N, Unchecked_Convert_To (Etype (Ent), Make_Attribute_Reference (Loc, Prefix => Make_Identifier (Loc, Chars (Dum)), Attribute_Name => Name_Address))); Analyze_And_Resolve (N, Etype (Ent)); end Expand_Import_Call; --------------------------- -- Expand_Intrinsic_Call -- --------------------------- procedure Expand_Intrinsic_Call (N : Node_Id; E : Entity_Id) is Nam : Name_Id; begin -- If an external name is specified for the intrinsic, it is handled -- by the back-end: leave the call node unchanged for now. if Present (Interface_Name (E)) then return; end if; -- If the intrinsic subprogram is generic, gets its original name if Present (Parent (E)) and then Present (Generic_Parent (Parent (E))) then Nam := Chars (Generic_Parent (Parent (E))); else Nam := Chars (E); end if; if Nam = Name_Asm then Expand_Asm_Call (N); elsif Nam = Name_Divide then Expand_Decimal_Divide_Call (N); elsif Nam = Name_Exception_Information then Expand_Exception_Call (N, RE_Exception_Information); elsif Nam = Name_Exception_Message then Expand_Exception_Call (N, RE_Exception_Message); elsif Nam = Name_Exception_Name then Expand_Exception_Call (N, RE_Exception_Name_Simple); elsif Nam = Name_Generic_Dispatching_Constructor then Expand_Dispatching_Constructor_Call (N); elsif Nam_In (Nam, Name_Import_Address, Name_Import_Largest_Value, Name_Import_Value) then Expand_Import_Call (N); elsif Nam = Name_Is_Negative then Expand_Is_Negative (N); elsif Nam = Name_Rotate_Left then Expand_Shift (N, E, N_Op_Rotate_Left); elsif Nam = Name_Rotate_Right then Expand_Shift (N, E, N_Op_Rotate_Right); elsif Nam = Name_Shift_Left then Expand_Shift (N, E, N_Op_Shift_Left); elsif Nam = Name_Shift_Right then Expand_Shift (N, E, N_Op_Shift_Right); elsif Nam = Name_Shift_Right_Arithmetic then Expand_Shift (N, E, N_Op_Shift_Right_Arithmetic); elsif Nam = Name_Unchecked_Conversion then Expand_Unc_Conversion (N, E); elsif Nam = Name_Unchecked_Deallocation then Expand_Unc_Deallocation (N); elsif Nam = Name_To_Address then Expand_To_Address (N); elsif Nam = Name_To_Pointer then Expand_To_Pointer (N); elsif Nam_In (Nam, Name_File, Name_Line, Name_Source_Location, Name_Enclosing_Entity, Name_Compilation_Date, Name_Compilation_Time) then Expand_Source_Info (N, Nam); -- If we have a renaming, expand the call to the original operation, -- which must itself be intrinsic, since renaming requires matching -- conventions and this has already been checked. elsif Present (Alias (E)) then Expand_Intrinsic_Call (N, Alias (E)); elsif Nkind (N) in N_Binary_Op then Expand_Binary_Operator_Call (N); -- The only other case is where an external name was specified, since -- this is the only way that an otherwise unrecognized name could -- escape the checking in Sem_Prag. Nothing needs to be done in such -- a case, since we pass such a call to the back end unchanged. else null; end if; end Expand_Intrinsic_Call; ------------------------ -- Expand_Is_Negative -- ------------------------ procedure Expand_Is_Negative (N : Node_Id) is Loc : constant Source_Ptr := Sloc (N); Opnd : constant Node_Id := Relocate_Node (First_Actual (N)); begin -- We replace the function call by the following expression -- if Opnd < 0.0 then -- True -- else -- if Opnd > 0.0 then -- False; -- else -- Float_Unsigned!(Float (Opnd)) /= 0 -- end if; -- end if; Rewrite (N, Make_If_Expression (Loc, Expressions => New_List ( Make_Op_Lt (Loc, Left_Opnd => Duplicate_Subexpr (Opnd), Right_Opnd => Make_Real_Literal (Loc, Ureal_0)), New_Occurrence_Of (Standard_True, Loc), Make_If_Expression (Loc, Expressions => New_List ( Make_Op_Gt (Loc, Left_Opnd => Duplicate_Subexpr_No_Checks (Opnd), Right_Opnd => Make_Real_Literal (Loc, Ureal_0)), New_Occurrence_Of (Standard_False, Loc), Make_Op_Ne (Loc, Left_Opnd => Unchecked_Convert_To (RTE (RE_Float_Unsigned), Convert_To (Standard_Float, Duplicate_Subexpr_No_Checks (Opnd))), Right_Opnd => Make_Integer_Literal (Loc, 0))))))); Analyze_And_Resolve (N, Standard_Boolean); end Expand_Is_Negative; ------------------ -- Expand_Shift -- ------------------ -- This procedure is used to convert a call to a shift function to the -- corresponding operator node. This conversion is not done by the usual -- circuit for converting calls to operator functions (e.g. "+"(1,2)) to -- operator nodes, because shifts are not predefined operators. -- As a result, whenever a shift is used in the source program, it will -- remain as a call until converted by this routine to the operator node -- form which the back end is expecting to see. -- Note: it is possible for the expander to generate shift operator nodes -- directly, which will be analyzed in the normal manner by calling Analyze -- and Resolve. Such shift operator nodes will not be seen by Expand_Shift. procedure Expand_Shift (N : Node_Id; E : Entity_Id; K : Node_Kind) is Entyp : constant Entity_Id := Etype (E); Left : constant Node_Id := First_Actual (N); Loc : constant Source_Ptr := Sloc (N); Right : constant Node_Id := Next_Actual (Left); Ltyp : constant Node_Id := Etype (Left); Rtyp : constant Node_Id := Etype (Right); Typ : constant Entity_Id := Etype (N); Snode : Node_Id; begin Snode := New_Node (K, Loc); Set_Right_Opnd (Snode, Relocate_Node (Right)); Set_Chars (Snode, Chars (E)); Set_Etype (Snode, Base_Type (Entyp)); Set_Entity (Snode, E); if Compile_Time_Known_Value (Type_High_Bound (Rtyp)) and then Expr_Value (Type_High_Bound (Rtyp)) < Esize (Ltyp) then Set_Shift_Count_OK (Snode, True); end if; if Typ = Entyp then -- Note that we don't call Analyze and Resolve on this node, because -- it already got analyzed and resolved when it was a function call. Set_Left_Opnd (Snode, Relocate_Node (Left)); Rewrite (N, Snode); Set_Analyzed (N); -- However, we do call the expander, so that the expansion for -- rotates and shift_right_arithmetic happens if Modify_Tree_For_C -- is set. if Expander_Active then Expand (N); end if; else -- If the context type is not the type of the operator, it is an -- inherited operator for a derived type. Wrap the node in a -- conversion so that it is type-consistent for possible further -- expansion (e.g. within a lock-free protected type). Set_Left_Opnd (Snode, Unchecked_Convert_To (Base_Type (Entyp), Relocate_Node (Left))); Rewrite (N, Unchecked_Convert_To (Typ, Snode)); -- Analyze and resolve result formed by conversion to target type Analyze_And_Resolve (N, Typ); end if; end Expand_Shift; ------------------------ -- Expand_Source_Info -- ------------------------ procedure Expand_Source_Info (N : Node_Id; Nam : Name_Id) is Loc : constant Source_Ptr := Sloc (N); Ent : Entity_Id; begin -- Integer cases if Nam = Name_Line then Rewrite (N, Make_Integer_Literal (Loc, Intval => UI_From_Int (Int (Get_Logical_Line_Number (Loc))))); Analyze_And_Resolve (N, Standard_Positive); -- String cases else Name_Len := 0; case Nam is when Name_File => Get_Decoded_Name_String (Reference_Name (Get_Source_File_Index (Loc))); when Name_Source_Location => Build_Location_String (Loc); when Name_Enclosing_Entity => -- Skip enclosing blocks to reach enclosing unit Ent := Current_Scope; while Present (Ent) loop exit when Ekind (Ent) /= E_Block and then Ekind (Ent) /= E_Loop; Ent := Scope (Ent); end loop; -- Ent now points to the relevant defining entity Write_Entity_Name (Ent); when Name_Compilation_Date => declare subtype S13 is String (1 .. 3); Months : constant array (1 .. 12) of S13 := ("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"); M1 : constant Character := Opt.Compilation_Time (6); M2 : constant Character := Opt.Compilation_Time (7); MM : constant Natural range 1 .. 12 := (Character'Pos (M1) - Character'Pos ('0')) * 10 + (Character'Pos (M2) - Character'Pos ('0')); begin -- Reformat ISO date into MMM DD YYYY (__DATE__) format Name_Buffer (1 .. 3) := Months (MM); Name_Buffer (4) := ' '; Name_Buffer (5 .. 6) := Opt.Compilation_Time (9 .. 10); Name_Buffer (7) := ' '; Name_Buffer (8 .. 11) := Opt.Compilation_Time (1 .. 4); Name_Len := 11; end; when Name_Compilation_Time => Name_Buffer (1 .. 8) := Opt.Compilation_Time (12 .. 19); Name_Len := 8; when others => raise Program_Error; end case; Rewrite (N, Make_String_Literal (Loc, Strval => String_From_Name_Buffer)); Analyze_And_Resolve (N, Standard_String); end if; Set_Is_Static_Expression (N); end Expand_Source_Info; --------------------------- -- Expand_Unc_Conversion -- --------------------------- procedure Expand_Unc_Conversion (N : Node_Id; E : Entity_Id) is Func : constant Entity_Id := Entity (Name (N)); Conv : Node_Id; Ftyp : Entity_Id; Ttyp : Entity_Id; begin -- Rewrite as unchecked conversion node. Note that we must convert -- the operand to the formal type of the input parameter of the -- function, so that the resulting N_Unchecked_Type_Conversion -- call indicates the correct types for Gigi. -- Right now, we only do this if a scalar type is involved. It is -- not clear if it is needed in other cases. If we do attempt to -- do the conversion unconditionally, it crashes 3411-018. To be -- investigated further ??? Conv := Relocate_Node (First_Actual (N)); Ftyp := Etype (First_Formal (Func)); if Is_Scalar_Type (Ftyp) then Conv := Convert_To (Ftyp, Conv); Set_Parent (Conv, N); Analyze_And_Resolve (Conv); end if; -- The instantiation of Unchecked_Conversion creates a wrapper package, -- and the target type is declared as a subtype of the actual. Recover -- the actual, which is the subtype indic. in the subtype declaration -- for the target type. This is semantically correct, and avoids -- anomalies with access subtypes. For entities, leave type as is. -- We do the analysis here, because we do not want the compiler -- to try to optimize or otherwise reorganize the unchecked -- conversion node. Ttyp := Etype (E); if Is_Entity_Name (Conv) then null; elsif Nkind (Parent (Ttyp)) = N_Subtype_Declaration then Ttyp := Entity (Subtype_Indication (Parent (Etype (E)))); elsif Is_Itype (Ttyp) then Ttyp := Entity (Subtype_Indication (Associated_Node_For_Itype (Ttyp))); else raise Program_Error; end if; Rewrite (N, Unchecked_Convert_To (Ttyp, Conv)); Set_Etype (N, Ttyp); Set_Analyzed (N); if Nkind (N) = N_Unchecked_Type_Conversion then Expand_N_Unchecked_Type_Conversion (N); end if; end Expand_Unc_Conversion; ----------------------------- -- Expand_Unc_Deallocation -- ----------------------------- procedure Expand_Unc_Deallocation (N : Node_Id) is Arg : constant Node_Id := First_Actual (N); Loc : constant Source_Ptr := Sloc (N); Typ : constant Entity_Id := Etype (Arg); Desig_Typ : constant Entity_Id := Designated_Type (Typ); Needs_Fin : constant Boolean := Needs_Finalization (Desig_Typ); Root_Typ : constant Entity_Id := Underlying_Type (Root_Type (Typ)); Pool : constant Entity_Id := Associated_Storage_Pool (Root_Typ); Stmts : constant List_Id := New_List; Arg_Known_Non_Null : constant Boolean := Known_Non_Null (N); -- This captures whether we know the argument to be non-null so that -- we can avoid the test. The reason that we need to capture this is -- that we analyze some generated statements before properly attaching -- them to the tree, and that can disturb current value settings. Exceptions_OK : constant Boolean := not Restriction_Active (No_Exception_Propagation); Abrt_Blk : Node_Id := Empty; Abrt_Blk_Id : Entity_Id; Abrt_HSS : Node_Id; AUD : Entity_Id; Fin_Blk : Node_Id; Fin_Call : Node_Id; Fin_Data : Finalization_Exception_Data; Free_Arg : Node_Id; Free_Nod : Node_Id; Gen_Code : Node_Id; Obj_Ref : Node_Id; begin -- Nothing to do if we know the argument is null if Known_Null (N) then return; end if; -- Processing for pointer to controlled types. Generate: -- Abrt : constant Boolean := ...; -- Ex : Exception_Occurrence; -- Raised : Boolean := False; -- begin -- Abort_Defer; -- begin -- [Deep_]Finalize (Obj_Ref); -- exception -- when others => -- if not Raised then -- Raised := True; -- Save_Occurrence (Ex, Get_Current_Excep.all.all); -- end; -- at end -- Abort_Undefer_Direct; -- end; -- Depending on whether exception propagation is enabled and/or aborts -- are allowed, the generated code may lack block statements. if Needs_Fin then Obj_Ref := Make_Explicit_Dereference (Loc, Prefix => Duplicate_Subexpr_No_Checks (Arg)); -- If the designated type is tagged, the finalization call must -- dispatch because the designated type may not be the actual type -- of the object. If the type is synchronized, the deallocation -- applies to the corresponding record type. if Is_Tagged_Type (Desig_Typ) then if Is_Concurrent_Type (Desig_Typ) then Obj_Ref := Unchecked_Convert_To (Class_Wide_Type (Corresponding_Record_Type (Desig_Typ)), Obj_Ref); elsif not Is_Class_Wide_Type (Desig_Typ) then Obj_Ref := Unchecked_Convert_To (Class_Wide_Type (Desig_Typ), Obj_Ref); end if; -- Otherwise the designated type is untagged. Set the type of the -- dereference explicitly to force a conversion when needed given -- that [Deep_]Finalize may be inherited from a parent type. else Set_Etype (Obj_Ref, Desig_Typ); end if; -- Generate: -- [Deep_]Finalize (Obj_Ref); Fin_Call := Make_Final_Call (Obj_Ref => Obj_Ref, Typ => Desig_Typ); -- Generate: -- Abrt : constant Boolean := ...; -- Ex : Exception_Occurrence; -- Raised : Boolean := False; -- begin -- -- exception -- when others => -- if not Raised then -- Raised := True; -- Save_Occurrence (Ex, Get_Current_Excep.all.all); -- end; if Exceptions_OK then Build_Object_Declarations (Fin_Data, Stmts, Loc); Fin_Blk := Make_Block_Statement (Loc, Handled_Statement_Sequence => Make_Handled_Sequence_Of_Statements (Loc, Statements => New_List (Fin_Call), Exception_Handlers => New_List ( Build_Exception_Handler (Fin_Data)))); -- Otherwise exception propagation is not allowed else Fin_Blk := Fin_Call; end if; -- The finalization action must be protected by an abort defer and -- undefer pair when aborts are allowed. Generate: -- begin -- Abort_Defer; -- -- at end -- Abort_Undefer_Direct; -- end; if Abort_Allowed then AUD := RTE (RE_Abort_Undefer_Direct); Abrt_HSS := Make_Handled_Sequence_Of_Statements (Loc, Statements => New_List ( Build_Runtime_Call (Loc, RE_Abort_Defer), Fin_Blk), At_End_Proc => New_Occurrence_Of (AUD, Loc)); Abrt_Blk := Make_Block_Statement (Loc, Handled_Statement_Sequence => Abrt_HSS); Add_Block_Identifier (Abrt_Blk, Abrt_Blk_Id); Expand_At_End_Handler (Abrt_HSS, Abrt_Blk_Id); -- Present the Abort_Undefer_Direct function to the backend so -- that it can inline the call to the function. Add_Inlined_Body (AUD, N); -- Otherwise aborts are not allowed else Abrt_Blk := Fin_Blk; end if; Append_To (Stmts, Abrt_Blk); end if; -- For a task type, call Free_Task before freeing the ATCB. We used to -- detect the case of Abort followed by a Free here, because the Free -- wouldn't actually free if it happens before the aborted task actually -- terminates. The warning was removed, because Free now works properly -- (the task will be freed once it terminates). if Is_Task_Type (Desig_Typ) then Append_To (Stmts, Cleanup_Task (N, Duplicate_Subexpr_No_Checks (Arg))); -- For composite types that contain tasks, recurse over the structure -- to build the selectors for the task subcomponents. elsif Has_Task (Desig_Typ) then if Is_Array_Type (Desig_Typ) then Append_List_To (Stmts, Cleanup_Array (N, Arg, Desig_Typ)); elsif Is_Record_Type (Desig_Typ) then Append_List_To (Stmts, Cleanup_Record (N, Arg, Desig_Typ)); end if; end if; -- Same for simple protected types. Eventually call Finalize_Protection -- before freeing the PO for each protected component. if Is_Simple_Protected_Type (Desig_Typ) then Append_To (Stmts, Cleanup_Protected_Object (N, Duplicate_Subexpr_No_Checks (Arg))); elsif Has_Simple_Protected_Object (Desig_Typ) then if Is_Array_Type (Desig_Typ) then Append_List_To (Stmts, Cleanup_Array (N, Arg, Desig_Typ)); elsif Is_Record_Type (Desig_Typ) then Append_List_To (Stmts, Cleanup_Record (N, Arg, Desig_Typ)); end if; end if; -- Normal processing for non-controlled types. The argument to free is -- a renaming rather than a constant to ensure that the original context -- is always set to null after the deallocation takes place. Free_Arg := Duplicate_Subexpr_No_Checks (Arg, Renaming_Req => True); Free_Nod := Make_Free_Statement (Loc, Empty); Append_To (Stmts, Free_Nod); Set_Storage_Pool (Free_Nod, Pool); -- Attach to tree before analysis of generated subtypes below Set_Parent (Stmts, Parent (N)); -- Deal with storage pool if Present (Pool) then -- Freeing the secondary stack is meaningless if Is_RTE (Pool, RE_SS_Pool) then null; -- If the pool object is of a simple storage pool type, then attempt -- to locate the type's Deallocate procedure, if any, and set the -- free operation's procedure to call. If the type doesn't have a -- Deallocate (which is allowed), then the actual will simply be set -- to null. elsif Present (Get_Rep_Pragma (Etype (Pool), Name_Simple_Storage_Pool_Type)) then declare Pool_Typ : constant Entity_Id := Base_Type (Etype (Pool)); Dealloc : Entity_Id; begin Dealloc := Get_Name_Entity_Id (Name_Deallocate); while Present (Dealloc) loop if Scope (Dealloc) = Scope (Pool_Typ) and then Present (First_Formal (Dealloc)) and then Etype (First_Formal (Dealloc)) = Pool_Typ then Set_Procedure_To_Call (Free_Nod, Dealloc); exit; else Dealloc := Homonym (Dealloc); end if; end loop; end; -- Case of a class-wide pool type: make a dispatching call to -- Deallocate through the class-wide Deallocate_Any. elsif Is_Class_Wide_Type (Etype (Pool)) then Set_Procedure_To_Call (Free_Nod, RTE (RE_Deallocate_Any)); -- Case of a specific pool type: make a statically bound call else Set_Procedure_To_Call (Free_Nod, Find_Prim_Op (Etype (Pool), Name_Deallocate)); end if; end if; if Present (Procedure_To_Call (Free_Nod)) then -- For all cases of a Deallocate call, the back-end needs to be able -- to compute the size of the object being freed. This may require -- some adjustments for objects of dynamic size. -- -- If the type is class wide, we generate an implicit type with the -- right dynamic size, so that the deallocate call gets the right -- size parameter computed by GIGI. Same for an access to -- unconstrained packed array. if Is_Class_Wide_Type (Desig_Typ) or else (Is_Array_Type (Desig_Typ) and then not Is_Constrained (Desig_Typ) and then Is_Packed (Desig_Typ)) then declare Deref : constant Node_Id := Make_Explicit_Dereference (Loc, Duplicate_Subexpr_No_Checks (Arg)); D_Subtyp : Node_Id; D_Type : Entity_Id; begin -- Perform minor decoration as it is needed by the side effect -- removal mechanism. Set_Etype (Deref, Desig_Typ); Set_Parent (Deref, Free_Nod); D_Subtyp := Make_Subtype_From_Expr (Deref, Desig_Typ); if Nkind (D_Subtyp) in N_Has_Entity then D_Type := Entity (D_Subtyp); else D_Type := Make_Temporary (Loc, 'A'); Insert_Action (Deref, Make_Subtype_Declaration (Loc, Defining_Identifier => D_Type, Subtype_Indication => D_Subtyp)); end if; -- Force freezing at the point of the dereference. For the -- class wide case, this avoids having the subtype frozen -- before the equivalent type. Freeze_Itype (D_Type, Deref); Set_Actual_Designated_Subtype (Free_Nod, D_Type); end; end if; end if; -- Ada 2005 (AI-251): In case of abstract interface type we must -- displace the pointer to reference the base of the object to -- deallocate its memory, unless we're targetting a VM, in which case -- no special processing is required. -- Generate: -- free (Base_Address (Obj_Ptr)) if Is_Interface (Directly_Designated_Type (Typ)) and then Tagged_Type_Expansion then Set_Expression (Free_Nod, Unchecked_Convert_To (Typ, Make_Function_Call (Loc, Name => New_Occurrence_Of (RTE (RE_Base_Address), Loc), Parameter_Associations => New_List ( Unchecked_Convert_To (RTE (RE_Address), Free_Arg))))); -- Generate: -- free (Obj_Ptr) else Set_Expression (Free_Nod, Free_Arg); end if; -- Only remaining step is to set result to null, or generate a raise of -- Constraint_Error if the target object is "not null". if Can_Never_Be_Null (Etype (Arg)) then Append_To (Stmts, Make_Raise_Constraint_Error (Loc, Reason => CE_Access_Check_Failed)); else declare Lhs : constant Node_Id := Duplicate_Subexpr_No_Checks (Arg); begin Set_Assignment_OK (Lhs); Append_To (Stmts, Make_Assignment_Statement (Loc, Name => Lhs, Expression => Make_Null (Loc))); end; end if; -- Generate a test of whether any earlier finalization raised an -- exception, and in that case raise Program_Error with the previous -- exception occurrence. -- Generate: -- if Raised and then not Abrt then -- raise Program_Error; -- for restricted RTS -- -- Raise_From_Controlled_Operation (E); -- all other cases -- end if; if Needs_Fin and then Exceptions_OK then Append_To (Stmts, Build_Raise_Statement (Fin_Data)); end if; -- If we know the argument is non-null, then make a block statement -- that contains the required statements, no need for a test. if Arg_Known_Non_Null then Gen_Code := Make_Block_Statement (Loc, Handled_Statement_Sequence => Make_Handled_Sequence_Of_Statements (Loc, Statements => Stmts)); -- If the argument may be null, wrap the statements inside an IF that -- does an explicit test to exclude the null case. else Gen_Code := Make_Implicit_If_Statement (N, Condition => Make_Op_Ne (Loc, Left_Opnd => Duplicate_Subexpr (Arg), Right_Opnd => Make_Null (Loc)), Then_Statements => Stmts); end if; -- Rewrite the call Rewrite (N, Gen_Code); Analyze (N); end Expand_Unc_Deallocation; ----------------------- -- Expand_To_Address -- ----------------------- procedure Expand_To_Address (N : Node_Id) is Loc : constant Source_Ptr := Sloc (N); Arg : constant Node_Id := First_Actual (N); Obj : Node_Id; begin Remove_Side_Effects (Arg); Obj := Make_Explicit_Dereference (Loc, Relocate_Node (Arg)); Rewrite (N, Make_If_Expression (Loc, Expressions => New_List ( Make_Op_Eq (Loc, Left_Opnd => New_Copy_Tree (Arg), Right_Opnd => Make_Null (Loc)), New_Occurrence_Of (RTE (RE_Null_Address), Loc), Make_Attribute_Reference (Loc, Prefix => Obj, Attribute_Name => Name_Address)))); Analyze_And_Resolve (N, RTE (RE_Address)); end Expand_To_Address; ----------------------- -- Expand_To_Pointer -- ----------------------- procedure Expand_To_Pointer (N : Node_Id) is Arg : constant Node_Id := First_Actual (N); begin Rewrite (N, Unchecked_Convert_To (Etype (N), Arg)); Analyze (N); end Expand_To_Pointer; ----------------------- -- Write_Entity_Name -- ----------------------- procedure Write_Entity_Name (E : Entity_Id) is procedure Write_Entity_Name_Inner (E : Entity_Id); -- Inner recursive routine, keep outer routine non-recursive to ease -- debugging when we get strange results from this routine. ----------------------------- -- Write_Entity_Name_Inner -- ----------------------------- procedure Write_Entity_Name_Inner (E : Entity_Id) is begin -- If entity has an internal name, skip by it, and print its scope. -- Note that Is_Internal_Name destroys Name_Buffer, hence the save -- and restore since we depend on its current contents. Note that -- we strip a final R from the name before the test, this is needed -- for some cases of instantiations. declare Save_NB : constant String := Name_Buffer (1 .. Name_Len); Save_NL : constant Natural := Name_Len; Iname : Boolean; begin Get_Name_String (Chars (E)); if Name_Buffer (Name_Len) = 'R' then Name_Len := Name_Len - 1; end if; Iname := Is_Internal_Name; Name_Buffer (1 .. Save_NL) := Save_NB; Name_Len := Save_NL; if Iname then Write_Entity_Name_Inner (Scope (E)); return; end if; end; -- Just print entity name if its scope is at the outer level if Scope (E) = Standard_Standard then null; -- If scope comes from source, write scope and entity elsif Comes_From_Source (Scope (E)) then Write_Entity_Name (Scope (E)); Add_Char_To_Name_Buffer ('.'); -- If in wrapper package skip past it elsif Is_Wrapper_Package (Scope (E)) then Write_Entity_Name (Scope (Scope (E))); Add_Char_To_Name_Buffer ('.'); -- Otherwise nothing to output (happens in unnamed block statements) else null; end if; -- Output the name declare Save_NB : constant String := Name_Buffer (1 .. Name_Len); Save_NL : constant Natural := Name_Len; begin Get_Unqualified_Decoded_Name_String (Chars (E)); -- Remove trailing upper case letters from the name (useful for -- dealing with some cases of internal names generated in the case -- of references from within a generic. while Name_Len > 1 and then Name_Buffer (Name_Len) in 'A' .. 'Z' loop Name_Len := Name_Len - 1; end loop; -- Adjust casing appropriately (gets name from source if possible) Adjust_Name_Case (Sloc (E)); -- Append to original entry value of Name_Buffer Name_Buffer (Save_NL + 1 .. Save_NL + Name_Len) := Name_Buffer (1 .. Name_Len); Name_Buffer (1 .. Save_NL) := Save_NB; Name_Len := Save_NL + Name_Len; end; end Write_Entity_Name_Inner; -- Start of processing for Write_Entity_Name begin Write_Entity_Name_Inner (E); end Write_Entity_Name; end Exp_Intr;