with Atree; use Atree;
with Debug; use Debug;
with Einfo; use Einfo;
with Errout; use Errout;
with Exp_Ch2; use Exp_Ch2;
with Exp_Util; use Exp_Util;
with Elists; use Elists;
with Freeze; use Freeze;
with Nlists; use Nlists;
with Nmake; use Nmake;
with Opt; use Opt;
with Restrict; use Restrict;
with Rtsfind; use Rtsfind;
with Sem; use Sem;
with Sem_Eval; use Sem_Eval;
with Sem_Res; use Sem_Res;
with Sem_Util; use Sem_Util;
with Sem_Warn; use Sem_Warn;
with Sinfo; use Sinfo;
with Snames; use Snames;
with Stand; use Stand;
with Targparm; use Targparm;
with Tbuild; use Tbuild;
with Ttypes; use Ttypes;
with Urealp; use Urealp;
with Validsw; use Validsw;
package body Checks is
procedure Apply_Selected_Length_Checks
(Ck_Node : Node_Id;
Target_Typ : Entity_Id;
Source_Typ : Entity_Id;
Do_Static : Boolean);
procedure Apply_Selected_Range_Checks
(Ck_Node : Node_Id;
Target_Typ : Entity_Id;
Source_Typ : Entity_Id;
Do_Static : Boolean);
function Get_Discriminal (E : Entity_Id; Bound : Node_Id) return Node_Id;
function Guard_Access
(Cond : Node_Id;
Loc : Source_Ptr;
Ck_Node : Node_Id)
return Node_Id;
procedure Install_Static_Check (R_Cno : Node_Id; Loc : Source_Ptr);
function Selected_Length_Checks
(Ck_Node : Node_Id;
Target_Typ : Entity_Id;
Source_Typ : Entity_Id;
Warn_Node : Node_Id)
return Check_Result;
function Selected_Range_Checks
(Ck_Node : Node_Id;
Target_Typ : Entity_Id;
Source_Typ : Entity_Id;
Warn_Node : Node_Id)
return Check_Result;
function Access_Checks_Suppressed (E : Entity_Id) return Boolean is
begin
return Scope_Suppress.Access_Checks
or else (Present (E) and then Suppress_Access_Checks (E));
end Access_Checks_Suppressed;
function Accessibility_Checks_Suppressed (E : Entity_Id) return Boolean is
begin
return Scope_Suppress.Accessibility_Checks
or else (Present (E) and then Suppress_Accessibility_Checks (E));
end Accessibility_Checks_Suppressed;
procedure Append_Range_Checks
(Checks : Check_Result;
Stmts : List_Id;
Suppress_Typ : Entity_Id;
Static_Sloc : Source_Ptr;
Flag_Node : Node_Id)
is
Internal_Flag_Node : Node_Id := Flag_Node;
Internal_Static_Sloc : Source_Ptr := Static_Sloc;
Checks_On : constant Boolean :=
(not Index_Checks_Suppressed (Suppress_Typ))
or else
(not Range_Checks_Suppressed (Suppress_Typ));
begin
if not Checks_On then
return;
end if;
for J in 1 .. 2 loop
exit when No (Checks (J));
if Nkind (Checks (J)) = N_Raise_Constraint_Error
and then Present (Condition (Checks (J)))
then
if not Has_Dynamic_Range_Check (Internal_Flag_Node) then
Append_To (Stmts, Checks (J));
Set_Has_Dynamic_Range_Check (Internal_Flag_Node);
end if;
else
Append_To
(Stmts,
Make_Raise_Constraint_Error (Internal_Static_Sloc,
Reason => CE_Range_Check_Failed));
end if;
end loop;
end Append_Range_Checks;
procedure Apply_Access_Check (N : Node_Id) is
P : constant Node_Id := Prefix (N);
begin
if Inside_A_Generic then
return;
end if;
if Is_Entity_Name (P) then
Check_Unset_Reference (P);
end if;
if Is_Entity_Name (P)
and then Access_Checks_Suppressed (Entity (P))
then
return;
elsif Access_Checks_Suppressed (Etype (P)) then
return;
else
Set_Do_Access_Check (N, True);
end if;
end Apply_Access_Check;
procedure Apply_Accessibility_Check (N : Node_Id; Typ : Entity_Id) is
Loc : constant Source_Ptr := Sloc (N);
Param_Ent : constant Entity_Id := Param_Entity (N);
Param_Level : Node_Id;
Type_Level : Node_Id;
begin
if Inside_A_Generic then
return;
elsif Present (Param_Ent)
and then Present (Extra_Accessibility (Param_Ent))
and then UI_Gt (Object_Access_Level (N),
Type_Access_Level (Typ))
and then not Accessibility_Checks_Suppressed (Param_Ent)
and then not Accessibility_Checks_Suppressed (Typ)
then
Param_Level :=
New_Occurrence_Of (Extra_Accessibility (Param_Ent), Loc);
Type_Level :=
Make_Integer_Literal (Loc, Type_Access_Level (Typ));
Insert_Action (N,
Make_Raise_Program_Error (Loc,
Condition =>
Make_Op_Gt (Loc,
Left_Opnd => Param_Level,
Right_Opnd => Type_Level),
Reason => PE_Accessibility_Check_Failed));
Analyze_And_Resolve (N);
end if;
end Apply_Accessibility_Check;
procedure Apply_Alignment_Check (E : Entity_Id; N : Node_Id) is
AC : constant Node_Id := Address_Clause (E);
Expr : Node_Id;
Loc : Source_Ptr;
begin
if No (AC) or else Range_Checks_Suppressed (E) then
return;
end if;
Loc := Sloc (AC);
Expr := Expression (AC);
if Nkind (Expr) = N_Unchecked_Type_Conversion then
Expr := Expression (Expr);
elsif Nkind (Expr) = N_Function_Call
and then Is_RTE (Entity (Name (Expr)), RE_To_Address)
then
Expr := First (Parameter_Associations (Expr));
if Nkind (Expr) = N_Parameter_Association then
Expr := Explicit_Actual_Parameter (Expr);
end if;
end if;
if Compile_Time_Known_Value (Expr)
and then Known_Alignment (E)
then
if Expr_Value (Expr) mod Alignment (E) /= 0 then
Insert_Action (N,
Make_Raise_Program_Error (Loc,
Reason => PE_Misaligned_Address_Value));
Error_Msg_NE
("?specified address for& not " &
"consistent with alignment", Expr, E);
end if;
else
if not Restrictions (No_Elaboration_Code) then
Insert_After_And_Analyze (N,
Make_Raise_Program_Error (Loc,
Condition =>
Make_Op_Ne (Loc,
Left_Opnd =>
Make_Op_Mod (Loc,
Left_Opnd =>
Unchecked_Convert_To
(RTE (RE_Integer_Address),
Duplicate_Subexpr (Expr)),
Right_Opnd =>
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (E, Loc),
Attribute_Name => Name_Alignment)),
Right_Opnd => Make_Integer_Literal (Loc, Uint_0)),
Reason => PE_Misaligned_Address_Value),
Suppress => All_Checks);
end if;
end if;
return;
end Apply_Alignment_Check;
procedure Apply_Arithmetic_Overflow_Check (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
Typ : constant Entity_Id := Etype (N);
Rtyp : constant Entity_Id := Root_Type (Typ);
Siz : constant Int := UI_To_Int (Esize (Rtyp));
Dsiz : constant Int := Siz * 2;
Opnod : Node_Id;
Ctyp : Entity_Id;
Opnd : Node_Id;
Cent : RE_Id;
Lo : Uint;
Hi : Uint;
OK : Boolean;
begin
if Backend_Overflow_Checks_On_Target
or not Do_Overflow_Check (N)
or not Expander_Active
then
return;
end if;
Determine_Range (N, OK, Lo, Hi);
if OK
and then Lo > Expr_Value (Type_Low_Bound (Typ))
and then Hi < Expr_Value (Type_High_Bound (Typ))
then
return;
end if;
if Dsiz <= Standard_Integer_Size then
Ctyp := Standard_Integer;
elsif Dsiz <= Standard_Long_Long_Integer_Size then
Ctyp := Standard_Long_Long_Integer;
else
if Nkind (N) = N_Op_Add then
Cent := RE_Add_With_Ovflo_Check;
elsif Nkind (N) = N_Op_Multiply then
Cent := RE_Multiply_With_Ovflo_Check;
else
pragma Assert (Nkind (N) = N_Op_Subtract);
Cent := RE_Subtract_With_Ovflo_Check;
end if;
Rewrite (N,
OK_Convert_To (Typ,
Make_Function_Call (Loc,
Name => New_Reference_To (RTE (Cent), Loc),
Parameter_Associations => New_List (
OK_Convert_To (RTE (RE_Integer_64), Left_Opnd (N)),
OK_Convert_To (RTE (RE_Integer_64), Right_Opnd (N))))));
Analyze_And_Resolve (N, Typ);
return;
end if;
Opnod := Relocate_Node (N);
Opnd := OK_Convert_To (Ctyp, Left_Opnd (Opnod));
Analyze (Opnd);
Set_Etype (Opnd, Ctyp);
Set_Analyzed (Opnd, True);
Set_Left_Opnd (Opnod, Opnd);
Opnd := OK_Convert_To (Ctyp, Right_Opnd (Opnod));
Analyze (Opnd);
Set_Etype (Opnd, Ctyp);
Set_Analyzed (Opnd, True);
Set_Right_Opnd (Opnod, Opnd);
Set_Etype (Opnod, Base_Type (Ctyp));
Set_Do_Overflow_Check (Opnod, False);
Set_Analyzed (Opnod, True);
Opnd := OK_Convert_To (Typ, Opnod);
Analyze (Opnd);
Set_Etype (Opnd, Typ);
Set_Analyzed (Opnd, True);
Set_Do_Overflow_Check (Opnd, True);
Rewrite (N, Opnd);
end Apply_Arithmetic_Overflow_Check;
procedure Apply_Array_Size_Check (N : Node_Id; Typ : Entity_Id) is
Loc : constant Source_Ptr := Sloc (N);
Ctyp : constant Entity_Id := Component_Type (Typ);
Ent : constant Entity_Id := Defining_Identifier (N);
Decl : Node_Id;
Lo : Node_Id;
Hi : Node_Id;
Lob : Uint;
Hib : Uint;
Siz : Uint;
Xtyp : Entity_Id;
Indx : Node_Id;
Sizx : Node_Id;
Code : Node_Id;
Static : Boolean := True;
Umark : constant Uintp.Save_Mark := Uintp.Mark;
Check_Siz : Uint;
function Is_Address_Or_Import (Decl : Node_Id) return Boolean;
function Is_Address_Or_Import (Decl : Node_Id) return Boolean is
begin
if Nkind (Decl) = N_At_Clause then
return Chars (Identifier (Decl)) = Chars (Ent);
elsif Nkind (Decl) = N_Attribute_Definition_Clause then
return
Chars (Decl) = Name_Address
and then
Nkind (Name (Decl)) = N_Identifier
and then
Chars (Name (Decl)) = Chars (Ent);
elsif Nkind (Decl) = N_Pragma then
if (Chars (Decl) = Name_Import
or else
Chars (Decl) = Name_Interface)
and then Present (Pragma_Argument_Associations (Decl))
then
declare
F : constant Node_Id :=
First (Pragma_Argument_Associations (Decl));
begin
return
Present (F)
and then
Present (Next (F))
and then
Nkind (Expression (Next (F))) = N_Identifier
and then
Chars (Expression (Next (F))) = Chars (Ent);
end;
else
return False;
end if;
else
return False;
end if;
end Is_Address_Or_Import;
begin
if not Expander_Active
or else Storage_Checks_Suppressed (Typ)
then
return;
end if;
if Inside_Init_Proc then
return;
end if;
Decl := N;
for Ctr in 1 .. 20 loop
Next (Decl);
exit when No (Decl);
if Is_Address_Or_Import (Decl) then
return;
end if;
end loop;
Siz := Uint_1;
Indx := First_Index (Typ);
while Present (Indx) loop
Xtyp := Etype (Indx);
Lo := Type_Low_Bound (Xtyp);
Hi := Type_High_Bound (Xtyp);
if Raises_Constraint_Error (Lo)
or else
Raises_Constraint_Error (Hi)
then
Uintp.Release (Umark);
return;
end if;
if Is_Static_Expression (Lo) then
Lob := Expr_Value (Lo);
else
Lob := Expr_Value (Type_Low_Bound (Base_Type (Xtyp)));
Static := False;
end if;
if Is_Static_Expression (Hi) then
Hib := Expr_Value (Hi);
else
Hib := Expr_Value (Type_High_Bound (Base_Type (Xtyp)));
Static := False;
end if;
Siz := Siz * UI_Max (Hib - Lob + 1, Uint_0);
Next_Index (Indx);
end loop;
if Is_Subprogram (Scope (Ent)) then
Check_Siz := Uint_2 ** 27;
else
Check_Siz := Uint_2 ** 31;
end if;
if Static and then Siz >= Check_Siz then
Insert_Action (N,
Make_Raise_Storage_Error (Loc,
Reason => SE_Object_Too_Large));
Warn_On_Instance := True;
Error_Msg_N ("?Storage_Error will be raised at run-time", N);
Warn_On_Instance := False;
Uintp.Release (Umark);
return;
end if;
if Known_Esize (Ctyp)
and then Siz * Esize (Ctyp) < Check_Siz
then
Uintp.Release (Umark);
return;
end if;
Uintp.Release (Umark);
Sizx :=
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Ctyp, Loc),
Attribute_Name => Name_Size);
Indx := First_Index (Typ);
for J in 1 .. Number_Dimensions (Typ) loop
if Sloc (Etype (Indx)) = Sloc (N) then
Ensure_Defined (Etype (Indx), N);
end if;
Sizx :=
Make_Op_Multiply (Loc,
Left_Opnd => Sizx,
Right_Opnd =>
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Typ, Loc),
Attribute_Name => Name_Length,
Expressions => New_List (
Make_Integer_Literal (Loc, J))));
Next_Index (Indx);
end loop;
Code :=
Make_Raise_Storage_Error (Loc,
Condition =>
Make_Op_Ge (Loc,
Left_Opnd => Sizx,
Right_Opnd =>
Make_Integer_Literal (Loc, Check_Siz)),
Reason => SE_Object_Too_Large);
Set_Size_Check_Code (Defining_Identifier (N), Code);
Insert_Action (N, Code);
end Apply_Array_Size_Check;
procedure Apply_Constraint_Check
(N : Node_Id;
Typ : Entity_Id;
No_Sliding : Boolean := False)
is
Desig_Typ : Entity_Id;
begin
if Inside_A_Generic then
return;
elsif Is_Scalar_Type (Typ) then
Apply_Scalar_Range_Check (N, Typ);
elsif Is_Array_Type (Typ) then
if Nkind (N) = N_Aggregate
and then No (Expressions (N))
and then Nkind
(First (Choices (First (Component_Associations (N)))))
= N_Others_Choice
then
return;
end if;
if Is_Constrained (Typ) then
Apply_Length_Check (N, Typ);
if No_Sliding then
Apply_Range_Check (N, Typ);
end if;
else
Apply_Range_Check (N, Typ);
end if;
elsif (Is_Record_Type (Typ)
or else Is_Private_Type (Typ))
and then Has_Discriminants (Base_Type (Typ))
and then Is_Constrained (Typ)
then
Apply_Discriminant_Check (N, Typ);
elsif Is_Access_Type (Typ) then
Desig_Typ := Designated_Type (Typ);
if Nkind (N) = N_Null then
null;
elsif Is_Array_Type (Desig_Typ) then
if Is_Constrained (Desig_Typ) then
Apply_Length_Check (N, Typ);
end if;
Apply_Range_Check (N, Typ);
elsif Has_Discriminants (Base_Type (Desig_Typ))
and then Is_Constrained (Desig_Typ)
then
Apply_Discriminant_Check (N, Typ);
end if;
end if;
end Apply_Constraint_Check;
procedure Apply_Discriminant_Check
(N : Node_Id;
Typ : Entity_Id;
Lhs : Node_Id := Empty)
is
Loc : constant Source_Ptr := Sloc (N);
Do_Access : constant Boolean := Is_Access_Type (Typ);
S_Typ : Entity_Id := Etype (N);
Cond : Node_Id;
T_Typ : Entity_Id;
function Is_Aliased_Unconstrained_Component return Boolean;
function Is_Aliased_Unconstrained_Component return Boolean is
Comp : Entity_Id;
Pref : Node_Id;
begin
if Nkind (Lhs) /= N_Selected_Component then
return False;
else
Comp := Entity (Selector_Name (Lhs));
Pref := Prefix (Lhs);
end if;
if Ekind (Comp) /= E_Component
or else not Is_Aliased (Comp)
then
return False;
end if;
return not Comes_From_Source (Pref)
and then In_Instance
and then not Is_Constrained (Etype (Comp));
end Is_Aliased_Unconstrained_Component;
begin
if Do_Access then
T_Typ := Designated_Type (Typ);
else
T_Typ := Typ;
end if;
if not Expander_Active
or else Discriminant_Checks_Suppressed (T_Typ)
then
return;
end if;
if Nkind (N) = N_Null then
return;
elsif Is_Access_Type (S_Typ) then
S_Typ := Designated_Type (S_Typ);
if Ekind (S_Typ) = E_Incomplete_Type then
return;
end if;
end if;
if Present (Lhs)
and then (Present (Param_Entity (Lhs))
or else (not Is_Constrained (T_Typ)
and then Is_Aliased_View (Lhs)
and then not Is_Aliased_Unconstrained_Component))
then
T_Typ := Get_Actual_Subtype (Lhs);
end if;
if not Is_Constrained (T_Typ) then
return;
end if;
if Nkind (Original_Node (N)) /= N_Allocator
and then (No (Lhs)
or else not Is_Entity_Name (Lhs)
or else (Ekind (Entity (Lhs)) /= E_In_Out_Parameter
and then Ekind (Entity (Lhs)) /= E_Out_Parameter))
then
if (Etype (N) = Typ
or else (Do_Access and then Designated_Type (Typ) = S_Typ))
and then not Is_Aliased_View (Lhs)
then
return;
end if;
elsif Nkind (Original_Node (N)) = N_Allocator
and then Is_Entity_Name (Expression (Original_Node (N)))
then
declare
Alloc_Typ : Entity_Id := Entity (Expression (Original_Node (N)));
begin
if Alloc_Typ = T_Typ
or else (Nkind (Parent (T_Typ)) = N_Subtype_Declaration
and then Is_Entity_Name (
Subtype_Indication (Parent (T_Typ)))
and then Alloc_Typ = Base_Type (T_Typ))
then
return;
end if;
end;
end if;
if Is_Constrained (S_Typ)
and then Nkind (Original_Node (N)) /= N_Allocator
then
declare
DconT : Elmt_Id;
Discr : Entity_Id;
DconS : Elmt_Id;
ItemS : Node_Id;
ItemT : Node_Id;
begin
if Has_Discriminants (S_Typ) then
Discr := First_Discriminant (S_Typ);
DconS := First_Elmt (Discriminant_Constraint (S_Typ));
else
Discr := First_Discriminant (Underlying_Type (S_Typ));
DconS :=
First_Elmt
(Discriminant_Constraint (Underlying_Type (S_Typ)));
if No (DconS) then
return;
end if;
end if;
DconT := First_Elmt (Discriminant_Constraint (T_Typ));
while Present (Discr) loop
ItemS := Node (DconS);
ItemT := Node (DconT);
exit when
not Is_OK_Static_Expression (ItemS)
or else
not Is_OK_Static_Expression (ItemT);
if Expr_Value (ItemS) /= Expr_Value (ItemT) then
if Do_Access then exit;
else
Apply_Compile_Time_Constraint_Error
(N, "incorrect value for discriminant&?",
CE_Discriminant_Check_Failed, Ent => Discr);
return;
end if;
end if;
Next_Elmt (DconS);
Next_Elmt (DconT);
Next_Discriminant (Discr);
end loop;
if No (Discr) then
return;
end if;
end;
end if;
Cond := Build_Discriminant_Checks (N, T_Typ);
if Present (Param_Entity (Lhs)) then
Cond :=
Make_And_Then (Loc,
Left_Opnd =>
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Param_Entity (Lhs), Loc),
Attribute_Name => Name_Constrained),
Right_Opnd => Cond);
end if;
if Do_Access then
Cond := Guard_Access (Cond, Loc, N);
end if;
Insert_Action (N,
Make_Raise_Constraint_Error (Loc,
Condition => Cond,
Reason => CE_Discriminant_Check_Failed));
end Apply_Discriminant_Check;
procedure Apply_Divide_Check (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
Typ : constant Entity_Id := Etype (N);
Left : constant Node_Id := Left_Opnd (N);
Right : constant Node_Id := Right_Opnd (N);
LLB : Uint;
Llo : Uint;
Lhi : Uint;
LOK : Boolean;
Rlo : Uint;
Rhi : Uint;
ROK : Boolean;
begin
if Expander_Active
and not Backend_Divide_Checks_On_Target
then
Determine_Range (Right, ROK, Rlo, Rhi);
if Do_Division_Check (N) then
if (not ROK) or else (Rlo <= 0 and then 0 <= Rhi) then
Insert_Action (N,
Make_Raise_Constraint_Error (Loc,
Condition =>
Make_Op_Eq (Loc,
Left_Opnd => Duplicate_Subexpr (Right),
Right_Opnd => Make_Integer_Literal (Loc, 0)),
Reason => CE_Divide_By_Zero));
end if;
end if;
if Do_Overflow_Check (N) then
if Nkind (N) = N_Op_Divide
and then Is_Signed_Integer_Type (Typ)
then
Determine_Range (Left, LOK, Llo, Lhi);
LLB := Expr_Value (Type_Low_Bound (Base_Type (Typ)));
if ((not ROK) or else (Rlo <= (-1) and then (-1) <= Rhi))
and then
((not LOK) or else (Llo = LLB))
then
Insert_Action (N,
Make_Raise_Constraint_Error (Loc,
Condition =>
Make_And_Then (Loc,
Make_Op_Eq (Loc,
Left_Opnd => Duplicate_Subexpr (Left),
Right_Opnd => Make_Integer_Literal (Loc, LLB)),
Make_Op_Eq (Loc,
Left_Opnd => Duplicate_Subexpr (Right),
Right_Opnd =>
Make_Integer_Literal (Loc, -1))),
Reason => CE_Overflow_Check_Failed));
end if;
end if;
end if;
end if;
end Apply_Divide_Check;
procedure Apply_Length_Check
(Ck_Node : Node_Id;
Target_Typ : Entity_Id;
Source_Typ : Entity_Id := Empty)
is
begin
Apply_Selected_Length_Checks
(Ck_Node, Target_Typ, Source_Typ, Do_Static => False);
end Apply_Length_Check;
procedure Apply_Range_Check
(Ck_Node : Node_Id;
Target_Typ : Entity_Id;
Source_Typ : Entity_Id := Empty)
is
begin
Apply_Selected_Range_Checks
(Ck_Node, Target_Typ, Source_Typ, Do_Static => False);
end Apply_Range_Check;
procedure Apply_Scalar_Range_Check
(Expr : Node_Id;
Target_Typ : Entity_Id;
Source_Typ : Entity_Id := Empty;
Fixed_Int : Boolean := False)
is
Parnt : constant Node_Id := Parent (Expr);
S_Typ : Entity_Id;
Arr : Node_Id := Empty; Arr_Typ : Entity_Id := Empty; OK : Boolean;
Is_Subscr_Ref : Boolean;
Is_Unconstrained_Subscr_Ref : Boolean;
Int_Real : Boolean;
procedure Bad_Value;
procedure Bad_Value is
begin
Apply_Compile_Time_Constraint_Error
(Expr, "value not in range of}?", CE_Range_Check_Failed,
Ent => Target_Typ,
Typ => Target_Typ);
end Bad_Value;
begin
if Inside_A_Generic then
return;
elsif Target_Typ = Any_Type
or else not Is_Scalar_Type (Target_Typ)
or else Raises_Constraint_Error (Expr)
then
return;
end if;
Is_Subscr_Ref :=
Is_List_Member (Expr) and then Nkind (Parnt) = N_Indexed_Component;
if Is_Subscr_Ref then
Arr := Prefix (Parnt);
Arr_Typ := Get_Actual_Subtype_If_Available (Arr);
end if;
if not Do_Range_Check (Expr) then
if Is_Subscr_Ref then
if Index_Checks_Suppressed (Arr_Typ)
or else Suppress_Index_Checks (Base_Type (Arr_Typ))
then
return;
elsif Is_Entity_Name (Arr)
and then Suppress_Index_Checks (Entity (Arr))
then
return;
elsif Is_Entity_Name (Expr)
and then Suppress_Index_Checks (Entity (Expr))
then
return;
end if;
else
if Range_Checks_Suppressed (Target_Typ)
or else Suppress_Range_Checks (Base_Type (Target_Typ))
then
return;
elsif Is_Entity_Name (Expr)
and then Suppress_Range_Checks (Entity (Expr))
then
return;
elsif Nkind (Parnt) = N_Assignment_Statement
and then Is_Entity_Name (Name (Parnt))
and then Suppress_Range_Checks (Entity (Name (Parnt)))
then
return;
end if;
end if;
end if;
if No (Source_Typ) then
S_Typ := Etype (Expr);
else
S_Typ := Source_Typ;
end if;
if not Is_Scalar_Type (S_Typ) or else S_Typ = Any_Type then
return;
end if;
Is_Unconstrained_Subscr_Ref :=
Is_Subscr_Ref and then not Is_Constrained (Arr_Typ);
if Is_Floating_Point_Type (S_Typ)
and then Has_Infinities (S_Typ)
and then not Has_Infinities (Target_Typ)
then
Enable_Range_Check (Expr);
end if;
if Is_Discrete_Type (Target_Typ)
and then Is_Discrete_Type (Etype (Expr))
and then not Is_Unconstrained_Subscr_Ref
and then No (Source_Typ)
then
declare
Tlo : constant Node_Id := Type_Low_Bound (Target_Typ);
Thi : constant Node_Id := Type_High_Bound (Target_Typ);
Lo : Uint;
Hi : Uint;
begin
if Compile_Time_Known_Value (Tlo)
and then Compile_Time_Known_Value (Thi)
then
Determine_Range (Expr, OK, Lo, Hi);
if OK then
declare
Lov : constant Uint := Expr_Value (Tlo);
Hiv : constant Uint := Expr_Value (Thi);
begin
if Lo >= Lov and then Hi <= Hiv then
return;
elsif Lov > Hi or else Hiv < Lo then
Bad_Value;
return;
end if;
end;
end if;
end if;
end;
end if;
Int_Real :=
Is_Floating_Point_Type (S_Typ)
or else (Is_Fixed_Point_Type (S_Typ) and then not Fixed_Int);
if not Is_Unconstrained_Subscr_Ref
and then
Is_Discrete_Type (S_Typ) = Is_Discrete_Type (Target_Typ)
and then
(In_Subrange_Of (S_Typ, Target_Typ, Fixed_Int)
or else
Is_In_Range (Expr, Target_Typ, Fixed_Int, Int_Real))
then
return;
elsif Is_Out_Of_Range (Expr, Target_Typ, Fixed_Int, Int_Real) then
Bad_Value;
return;
elsif Nkind (Expr) = N_Unchecked_Type_Conversion
and then Kill_Range_Check (Expr)
then
return;
else
Enable_Range_Check (Expr);
return;
end if;
end Apply_Scalar_Range_Check;
procedure Apply_Selected_Length_Checks
(Ck_Node : Node_Id;
Target_Typ : Entity_Id;
Source_Typ : Entity_Id;
Do_Static : Boolean)
is
Cond : Node_Id;
R_Result : Check_Result;
R_Cno : Node_Id;
Loc : constant Source_Ptr := Sloc (Ck_Node);
Checks_On : constant Boolean :=
(not Index_Checks_Suppressed (Target_Typ))
or else
(not Length_Checks_Suppressed (Target_Typ));
begin
if not Expander_Active then
return;
end if;
R_Result :=
Selected_Length_Checks (Ck_Node, Target_Typ, Source_Typ, Empty);
for J in 1 .. 2 loop
R_Cno := R_Result (J);
exit when No (R_Cno);
if Ekind (Current_Scope) = E_Package
and then Is_Compilation_Unit (Current_Scope)
then
Ensure_Defined (Target_Typ, Ck_Node);
if Present (Source_Typ) then
Ensure_Defined (Source_Typ, Ck_Node);
elsif Is_Itype (Etype (Ck_Node)) then
Ensure_Defined (Etype (Ck_Node), Ck_Node);
end if;
end if;
if Nkind (R_Cno) = N_Raise_Constraint_Error
and then Present (Condition (R_Cno))
then
Cond := Condition (R_Cno);
if not Has_Dynamic_Length_Check (Ck_Node)
and then Checks_On
then
Insert_Action (Ck_Node, R_Cno);
if not Do_Static then
Set_Has_Dynamic_Length_Check (Ck_Node);
end if;
end if;
if Is_Entity_Name (Cond)
and then Entity (Cond) = Standard_True
then
Apply_Compile_Time_Constraint_Error
(Ck_Node, "wrong length for array of}?",
CE_Length_Check_Failed,
Ent => Target_Typ,
Typ => Target_Typ);
elsif Do_Static or else not Checks_On then
Rewrite (R_Cno, Make_Null_Statement (Loc));
end if;
else
Install_Static_Check (R_Cno, Loc);
end if;
end loop;
end Apply_Selected_Length_Checks;
procedure Apply_Selected_Range_Checks
(Ck_Node : Node_Id;
Target_Typ : Entity_Id;
Source_Typ : Entity_Id;
Do_Static : Boolean)
is
Cond : Node_Id;
R_Result : Check_Result;
R_Cno : Node_Id;
Loc : constant Source_Ptr := Sloc (Ck_Node);
Checks_On : constant Boolean :=
(not Index_Checks_Suppressed (Target_Typ))
or else
(not Range_Checks_Suppressed (Target_Typ));
begin
if not Expander_Active or else not Checks_On then
return;
end if;
R_Result :=
Selected_Range_Checks (Ck_Node, Target_Typ, Source_Typ, Empty);
for J in 1 .. 2 loop
R_Cno := R_Result (J);
exit when No (R_Cno);
if Nkind (R_Cno) = N_Raise_Constraint_Error
and then Present (Condition (R_Cno))
then
Cond := Condition (R_Cno);
if not Has_Dynamic_Range_Check (Ck_Node) then
Insert_Action (Ck_Node, R_Cno);
if not Do_Static then
Set_Has_Dynamic_Range_Check (Ck_Node);
end if;
end if;
if Is_Entity_Name (Cond)
and then Entity (Cond) = Standard_True
then
if Nkind (Ck_Node) = N_Range then
Apply_Compile_Time_Constraint_Error
(Low_Bound (Ck_Node), "static range out of bounds of}?",
CE_Range_Check_Failed,
Ent => Target_Typ,
Typ => Target_Typ);
Set_Raises_Constraint_Error (Ck_Node);
else
Apply_Compile_Time_Constraint_Error
(Ck_Node, "static value out of range of}?",
CE_Range_Check_Failed,
Ent => Target_Typ,
Typ => Target_Typ);
end if;
elsif Do_Static or else not Checks_On then
Rewrite (R_Cno, Make_Null_Statement (Loc));
end if;
else
Install_Static_Check (R_Cno, Loc);
end if;
end loop;
end Apply_Selected_Range_Checks;
procedure Apply_Static_Length_Check
(Expr : Node_Id;
Target_Typ : Entity_Id;
Source_Typ : Entity_Id := Empty)
is
begin
Apply_Selected_Length_Checks
(Expr, Target_Typ, Source_Typ, Do_Static => True);
end Apply_Static_Length_Check;
procedure Apply_Subscript_Validity_Checks (Expr : Node_Id) is
Sub : Node_Id;
begin
pragma Assert (Nkind (Expr) = N_Indexed_Component);
Sub := First (Expressions (Expr));
while Present (Sub) loop
Ensure_Valid (Sub, Holes_OK => True);
Sub := Next (Sub);
end loop;
end Apply_Subscript_Validity_Checks;
procedure Apply_Type_Conversion_Checks (N : Node_Id) is
Target_Type : constant Entity_Id := Etype (N);
Target_Base : constant Entity_Id := Base_Type (Target_Type);
Expr : constant Node_Id := Expression (N);
Expr_Type : constant Entity_Id := Etype (Expr);
begin
if Inside_A_Generic then
return;
elsif Serious_Errors_Detected > 0 then
return;
elsif Is_Scalar_Type (Target_Type) then
declare
Conv_OK : constant Boolean := Conversion_OK (N);
begin
if not Overflow_Checks_Suppressed (Target_Base)
and then not In_Subrange_Of (Expr_Type, Target_Base, Conv_OK)
then
Set_Do_Overflow_Check (N);
end if;
if not Range_Checks_Suppressed (Target_Type)
and then not Range_Checks_Suppressed (Expr_Type)
then
Apply_Scalar_Range_Check
(Expr, Target_Type, Fixed_Int => Conv_OK);
end if;
end;
elsif Comes_From_Source (N)
and then Is_Record_Type (Target_Type)
and then Is_Derived_Type (Target_Type)
and then not Is_Tagged_Type (Target_Type)
and then not Is_Constrained (Target_Type)
and then Present (Girder_Constraint (Target_Type))
then
declare
Loc : constant Source_Ptr := Sloc (N);
Cond : Node_Id;
Constraint : Elmt_Id;
Discr_Value : Node_Id;
Discr : Entity_Id;
New_Constraints : Elist_Id := New_Elmt_List;
Old_Constraints : Elist_Id := Discriminant_Constraint (Expr_Type);
begin
Constraint := First_Elmt (Girder_Constraint (Target_Type));
while Present (Constraint) loop
Discr_Value := Node (Constraint);
if Is_Entity_Name (Discr_Value)
and then Ekind (Entity (Discr_Value)) = E_Discriminant
then
Discr := Corresponding_Discriminant (Entity (Discr_Value));
if Present (Discr)
and then Scope (Discr) = Base_Type (Expr_Type)
then
Append_Elmt (
Make_Selected_Component (Loc,
Prefix =>
Duplicate_Subexpr (Expr, Name_Req => True),
Selector_Name =>
Make_Identifier (Loc, Chars (Discr))),
New_Constraints);
else
return;
end if;
else
Append_Elmt
(Duplicate_Subexpr (Discr_Value), New_Constraints);
end if;
Next_Elmt (Constraint);
end loop;
Set_Discriminant_Constraint (Expr_Type, New_Constraints);
Cond := Build_Discriminant_Checks (Expr, Expr_Type);
Set_Discriminant_Constraint (Expr_Type, Old_Constraints);
Insert_Action (N,
Make_Raise_Constraint_Error (Loc,
Condition => Cond,
Reason => CE_Discriminant_Check_Failed));
end;
else
null;
end if;
end Apply_Type_Conversion_Checks;
procedure Apply_Universal_Integer_Attribute_Checks (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
Typ : constant Entity_Id := Etype (N);
begin
if Inside_A_Generic then
return;
elsif Range_Checks_Suppressed (Typ)
and then Overflow_Checks_Suppressed (Typ)
then
return;
elsif not Comes_From_Source (N) then
return;
else
Set_Etype (N, Universal_Integer);
Set_Analyzed (N, True);
Rewrite (N,
Make_Type_Conversion (Loc,
Subtype_Mark => New_Occurrence_Of (Typ, Loc),
Expression => Relocate_Node (N)));
Analyze_And_Resolve (N, Typ);
return;
end if;
end Apply_Universal_Integer_Attribute_Checks;
function Build_Discriminant_Checks
(N : Node_Id;
T_Typ : Entity_Id)
return Node_Id
is
Loc : constant Source_Ptr := Sloc (N);
Cond : Node_Id;
Disc : Elmt_Id;
Disc_Ent : Entity_Id;
Dval : Node_Id;
begin
Cond := Empty;
Disc := First_Elmt (Discriminant_Constraint (T_Typ));
if Is_Private_Type (T_Typ)
and then No (Full_View (T_Typ))
then
Disc_Ent := First_Discriminant (Etype (Base_Type (T_Typ)));
else
Disc_Ent := First_Discriminant (T_Typ);
end if;
while Present (Disc) loop
Dval := Node (Disc);
if Nkind (Dval) = N_Identifier
and then Ekind (Entity (Dval)) = E_Discriminant
then
Dval := New_Occurrence_Of (Discriminal (Entity (Dval)), Loc);
else
Dval := Duplicate_Subexpr (Dval);
end if;
Evolve_Or_Else (Cond,
Make_Op_Ne (Loc,
Left_Opnd =>
Make_Selected_Component (Loc,
Prefix =>
Duplicate_Subexpr (N, Name_Req => True),
Selector_Name =>
Make_Identifier (Loc, Chars (Disc_Ent))),
Right_Opnd => Dval));
Next_Elmt (Disc);
Next_Discriminant (Disc_Ent);
end loop;
return Cond;
end Build_Discriminant_Checks;
procedure Check_Valid_Lvalue_Subscripts (Expr : Node_Id) is
begin
if Range_Checks_Suppressed (Etype (Expr)) then
return;
elsif not Comes_From_Source (Expr) then
return;
elsif Nkind (Expr) = N_Selected_Component then
Check_Valid_Lvalue_Subscripts (Prefix (Expr));
return;
elsif Nkind (Expr) = N_Indexed_Component then
Apply_Subscript_Validity_Checks (Expr);
Check_Valid_Lvalue_Subscripts (Prefix (Expr));
end if;
end Check_Valid_Lvalue_Subscripts;
Cache_Size : constant := 2 ** 10;
type Cache_Index is range 0 .. Cache_Size - 1;
Determine_Range_Cache_N : array (Cache_Index) of Node_Id;
Determine_Range_Cache_Lo : array (Cache_Index) of Uint;
Determine_Range_Cache_Hi : array (Cache_Index) of Uint;
procedure Determine_Range
(N : Node_Id;
OK : out Boolean;
Lo : out Uint;
Hi : out Uint)
is
Typ : constant Entity_Id := Etype (N);
Lo_Left : Uint;
Hi_Left : Uint;
Lo_Right : Uint;
Hi_Right : Uint;
Bound : Node_Id;
Hbound : Uint;
Lor : Uint;
Hir : Uint;
OK1 : Boolean;
Cindex : Cache_Index;
function OK_Operands return Boolean;
function OK_Operands return Boolean is
begin
Determine_Range (Left_Opnd (N), OK1, Lo_Left, Hi_Left);
if not OK1 then
return False;
end if;
Determine_Range (Right_Opnd (N), OK1, Lo_Right, Hi_Right);
return OK1;
end OK_Operands;
begin
Lo := No_Uint;
Hi := No_Uint;
Lor := No_Uint;
Hir := No_Uint;
if No (Typ) or else not Is_Discrete_Type (Typ)
or else Error_Posted (N)
then
OK := False;
return;
end if;
OK := True;
if Compile_Time_Known_Value (N) then
Lo := Expr_Value (N);
Hi := Lo;
return;
end if;
Cindex := Cache_Index (N mod Cache_Size);
if Determine_Range_Cache_N (Cindex) = N then
Lo := Determine_Range_Cache_Lo (Cindex);
Hi := Determine_Range_Cache_Hi (Cindex);
return;
end if;
Bound := Type_Low_Bound (Typ);
if Compile_Time_Known_Value (Bound) then
Lo := Expr_Value (Bound);
elsif Compile_Time_Known_Value (Type_Low_Bound (Base_Type (Typ))) then
Lo := Expr_Value (Type_Low_Bound (Base_Type (Typ)));
else
OK := False;
return;
end if;
Bound := Type_High_Bound (Typ);
if Compile_Time_Known_Value (Type_High_Bound (Base_Type (Typ))) then
Hbound := Expr_Value (Type_High_Bound (Base_Type (Typ)));
Hi := Hbound;
else
OK := False;
return;
end if;
if Compile_Time_Known_Value (Bound) then
Hi := Expr_Value (Bound);
end if;
case Nkind (N) is
when N_Op_Plus =>
Determine_Range (Right_Opnd (N), OK1, Lor, Hir);
when N_Op_Minus =>
Determine_Range (Right_Opnd (N), OK1, Lo_Right, Hi_Right);
if OK1 then
Lor := -Hi_Right;
Hir := -Lo_Right;
end if;
when N_Op_Add =>
if OK_Operands then
Lor := Lo_Left + Lo_Right;
Hir := Hi_Left + Hi_Right;
end if;
when N_Op_Divide =>
if OK_Operands then
if Lo_Right = Hi_Right
and then Lo_Right > 0
then
Lor := Lo_Left / Lo_Right;
Hir := Hi_Left / Lo_Right;
else
OK1 := False;
end if;
end if;
when N_Op_Subtract =>
if OK_Operands then
Lor := Lo_Left - Hi_Right;
Hir := Hi_Left - Lo_Right;
end if;
when N_Op_Mod =>
if OK_Operands then
if Lo_Right = Hi_Right then
if Lo_Right > 0 then
Lor := Uint_0;
Hir := Lo_Right - 1;
elsif Lo_Right < 0 then
Lor := Lo_Right + 1;
Hir := Uint_0;
end if;
else
OK1 := False;
end if;
end if;
when N_Op_Rem =>
if OK_Operands then
if Lo_Right = Hi_Right then
declare
Dval : constant Uint := (abs Lo_Right) - 1;
begin
if Lo_Left < 0 then
Lor := -Dval;
else
Lor := Uint_0;
end if;
if Hi_Left < 0 then
Hir := Uint_0;
else
Hir := Dval;
end if;
end;
else
OK1 := False;
end if;
end if;
when N_Attribute_Reference =>
case Attribute_Name (N) is
when Name_Pos | Name_Val =>
Determine_Range (First (Expressions (N)), OK1, Lor, Hir);
when Name_Length =>
declare
Atyp : Entity_Id := Etype (Prefix (N));
Inum : Nat;
Indx : Node_Id;
LL, LU : Uint;
UL, UU : Uint;
begin
if Is_Access_Type (Atyp) then
Atyp := Designated_Type (Atyp);
end if;
if Ekind (Atyp) = E_String_Literal_Subtype then
OK := True;
Lo := String_Literal_Length (Atyp);
Hi := String_Literal_Length (Atyp);
return;
end if;
if No (Expressions (N)) then
Inum := 1;
else
Inum :=
UI_To_Int (Expr_Value (First (Expressions (N))));
end if;
Indx := First_Index (Atyp);
for J in 2 .. Inum loop
Indx := Next_Index (Indx);
end loop;
Determine_Range
(Type_Low_Bound (Etype (Indx)), OK1, LL, LU);
if OK1 then
Determine_Range
(Type_High_Bound (Etype (Indx)), OK1, UL, UU);
if OK1 then
Hir := UI_Max (Uint_0, UU - LL);
if Is_Constrained (Atyp) then
Lor := UI_Max (Uint_0, UL - LU);
else
Lor := Uint_0;
end if;
end if;
end if;
end;
when others =>
OK1 := False;
end case;
when N_Type_Conversion =>
Determine_Range (Expression (N), OK1, Lor, Hir);
when others =>
OK1 := False;
Lor := No_Uint;
Hir := No_Uint;
end case;
if OK1 then
if Lor > Lo
and then not (Is_Modular_Integer_Type (Typ)
and then Hir > Hbound)
then
Lo := Lor;
end if;
if Hir < Hi
and then not (Is_Modular_Integer_Type (Typ)
and then Lor < Uint_0)
then
Hi := Hir;
end if;
end if;
Determine_Range_Cache_N (Cindex) := N;
Determine_Range_Cache_Lo (Cindex) := Lo;
Determine_Range_Cache_Hi (Cindex) := Hi;
return;
exception
when others =>
if Debug_Flag_K then
raise;
else
OK := False;
Lo := No_Uint;
Hi := No_Uint;
return;
end if;
end Determine_Range;
function Discriminant_Checks_Suppressed (E : Entity_Id) return Boolean is
begin
return Scope_Suppress.Discriminant_Checks
or else (Present (E) and then Suppress_Discriminant_Checks (E));
end Discriminant_Checks_Suppressed;
function Division_Checks_Suppressed (E : Entity_Id) return Boolean is
begin
return Scope_Suppress.Division_Checks
or else (Present (E) and then Suppress_Division_Checks (E));
end Division_Checks_Suppressed;
function Elaboration_Checks_Suppressed (E : Entity_Id) return Boolean is
begin
return Scope_Suppress.Elaboration_Checks
or else (Present (E) and then Suppress_Elaboration_Checks (E));
end Elaboration_Checks_Suppressed;
procedure Enable_Range_Check (N : Node_Id) is
begin
if Nkind (N) = N_Unchecked_Type_Conversion
and then Kill_Range_Check (N)
then
return;
else
Set_Do_Range_Check (N, True);
end if;
end Enable_Range_Check;
procedure Ensure_Valid (Expr : Node_Id; Holes_OK : Boolean := False) is
Typ : constant Entity_Id := Etype (Expr);
begin
if not Validity_Checks_On then
return;
elsif not Comes_From_Source (Expr)
and then (Nkind (Expr) /= N_Unchecked_Type_Conversion
or else Kill_Range_Check (Expr))
then
return;
elsif Expr_Known_Valid (Expr) then
return;
elsif Range_Checks_Suppressed (Typ) then
return;
elsif Is_Enumeration_Type (Typ)
and then Has_Non_Standard_Rep (Typ)
and then Holes_OK
then
return;
elsif Nkind (Parent (Expr)) = N_Assignment_Statement
and then Expr = Name (Parent (Expr))
then
return;
else
if Is_Scalar_Type (Typ) then
declare
P : Node_Id;
N : Node_Id;
E : Entity_Id;
F : Entity_Id;
A : Node_Id;
L : List_Id;
begin
N := Expr;
P := Parent (Expr);
if Nkind (P) = N_Parameter_Association then
N := P;
P := Parent (N);
end if;
if Nkind (P) = N_Procedure_Call_Statement then
L := Parameter_Associations (P);
E := Entity (Name (P));
if Is_Non_Empty_List (L)
and then Is_Subprogram (E)
then
F := First_Formal (E);
A := First (L);
while Present (F) loop
if Ekind (F) = E_Out_Parameter and then A = N then
return;
end if;
Next_Formal (F);
Next (A);
end loop;
end if;
end if;
end;
end if;
end if;
Insert_Valid_Check (Expr);
end Ensure_Valid;
function Expr_Known_Valid (Expr : Node_Id) return Boolean is
Typ : constant Entity_Id := Etype (Expr);
begin
if not Is_Scalar_Type (Typ) then
return True;
elsif not Validity_Checks_On then
return True;
elsif Is_Floating_Point_Type (Typ)
and then not Validity_Check_Floating_Point
then
return True;
elsif Is_Entity_Name (Expr)
and then Is_Known_Valid (Entity (Expr))
then
return True;
elsif Is_Known_Valid (Typ) then
if Is_Entity_Name (Expr)
and then Ekind (Entity (Expr)) = E_Variable
and then Esize (Entity (Expr)) > Esize (Typ)
then
return False;
else
return True;
end if;
elsif Nkind (Expr) = N_Integer_Literal
or else
Nkind (Expr) = N_Character_Literal
then
return True;
elsif Nkind (Expr) = N_Type_Conversion
or else
Nkind (Expr) = N_Qualified_Expression
then
return Expr_Known_Valid (Expression (Expr));
elsif Nkind (Expr) in N_Binary_Op
or else
Nkind (Expr) in N_Unary_Op
or else
Nkind (Expr) = N_Function_Call
then
return True;
else
return False;
end if;
end Expr_Known_Valid;
function Get_Discriminal (E : Entity_Id; Bound : Node_Id) return Node_Id is
Loc : constant Source_Ptr := Sloc (E);
D : Entity_Id;
Sc : Entity_Id;
begin
Sc := Scope (E);
if Ekind (Sc) /= E_Protected_Type then
Sc := Scope (Sc);
if Ekind (Sc) /= E_Protected_Type then
return Bound;
end if;
end if;
D := First_Discriminant (Sc);
while Present (D)
and then Chars (D) /= Chars (Bound)
loop
Next_Discriminant (D);
end loop;
return New_Occurrence_Of (Discriminal (D), Loc);
end Get_Discriminal;
function Guard_Access
(Cond : Node_Id;
Loc : Source_Ptr;
Ck_Node : Node_Id)
return Node_Id
is
begin
if Nkind (Cond) = N_Or_Else then
Set_Paren_Count (Cond, 1);
end if;
if Nkind (Ck_Node) = N_Allocator then
return Cond;
else
return
Make_And_Then (Loc,
Left_Opnd =>
Make_Op_Ne (Loc,
Left_Opnd => Duplicate_Subexpr (Ck_Node),
Right_Opnd => Make_Null (Loc)),
Right_Opnd => Cond);
end if;
end Guard_Access;
function Index_Checks_Suppressed (E : Entity_Id) return Boolean is
begin
return Scope_Suppress.Index_Checks
or else (Present (E) and then Suppress_Index_Checks (E));
end Index_Checks_Suppressed;
procedure Initialize is
begin
for J in Determine_Range_Cache_N'Range loop
Determine_Range_Cache_N (J) := Empty;
end loop;
end Initialize;
procedure Insert_Range_Checks
(Checks : Check_Result;
Node : Node_Id;
Suppress_Typ : Entity_Id;
Static_Sloc : Source_Ptr := No_Location;
Flag_Node : Node_Id := Empty;
Do_Before : Boolean := False)
is
Internal_Flag_Node : Node_Id := Flag_Node;
Internal_Static_Sloc : Source_Ptr := Static_Sloc;
Check_Node : Node_Id;
Checks_On : constant Boolean :=
(not Index_Checks_Suppressed (Suppress_Typ))
or else
(not Range_Checks_Suppressed (Suppress_Typ));
begin
if not Expander_Active or else not Checks_On then
return;
end if;
if Static_Sloc = No_Location then
Internal_Static_Sloc := Sloc (Node);
end if;
if No (Flag_Node) then
Internal_Flag_Node := Node;
end if;
for J in 1 .. 2 loop
exit when No (Checks (J));
if Nkind (Checks (J)) = N_Raise_Constraint_Error
and then Present (Condition (Checks (J)))
then
if not Has_Dynamic_Range_Check (Internal_Flag_Node) then
Check_Node := Checks (J);
Mark_Rewrite_Insertion (Check_Node);
if Do_Before then
Insert_Before_And_Analyze (Node, Check_Node);
else
Insert_After_And_Analyze (Node, Check_Node);
end if;
Set_Has_Dynamic_Range_Check (Internal_Flag_Node);
end if;
else
Check_Node :=
Make_Raise_Constraint_Error (Internal_Static_Sloc,
Reason => CE_Range_Check_Failed);
Mark_Rewrite_Insertion (Check_Node);
if Do_Before then
Insert_Before_And_Analyze (Node, Check_Node);
else
Insert_After_And_Analyze (Node, Check_Node);
end if;
end if;
end loop;
end Insert_Range_Checks;
procedure Insert_Valid_Check (Expr : Node_Id) is
Loc : constant Source_Ptr := Sloc (Expr);
Exp : Node_Id;
begin
if Range_Checks_Suppressed (Etype (Expr))
or else (not Validity_Checks_On)
then
return;
end if;
Exp := Expr;
while Nkind (Exp) = N_Type_Conversion loop
Exp := Expression (Exp);
end loop;
Validity_Checks_On := False;
Insert_Action
(Expr,
Make_Raise_Constraint_Error (Loc,
Condition =>
Make_Op_Not (Loc,
Right_Opnd =>
Make_Attribute_Reference (Loc,
Prefix =>
Duplicate_Subexpr (Exp, Name_Req => True),
Attribute_Name => Name_Valid)),
Reason => CE_Invalid_Data),
Suppress => All_Checks);
Validity_Checks_On := True;
end Insert_Valid_Check;
procedure Install_Static_Check (R_Cno : Node_Id; Loc : Source_Ptr) is
Stat : constant Boolean := Is_Static_Expression (R_Cno);
Typ : constant Entity_Id := Etype (R_Cno);
begin
Rewrite (R_Cno,
Make_Raise_Constraint_Error (Loc,
Reason => CE_Range_Check_Failed));
Set_Analyzed (R_Cno);
Set_Etype (R_Cno, Typ);
Set_Raises_Constraint_Error (R_Cno);
Set_Is_Static_Expression (R_Cno, Stat);
end Install_Static_Check;
function Length_Checks_Suppressed (E : Entity_Id) return Boolean is
begin
return Scope_Suppress.Length_Checks
or else (Present (E) and then Suppress_Length_Checks (E));
end Length_Checks_Suppressed;
function Overflow_Checks_Suppressed (E : Entity_Id) return Boolean is
begin
return Scope_Suppress.Overflow_Checks
or else (Present (E) and then Suppress_Overflow_Checks (E));
end Overflow_Checks_Suppressed;
function Range_Check
(Ck_Node : Node_Id;
Target_Typ : Entity_Id;
Source_Typ : Entity_Id := Empty;
Warn_Node : Node_Id := Empty)
return Check_Result
is
begin
return Selected_Range_Checks
(Ck_Node, Target_Typ, Source_Typ, Warn_Node);
end Range_Check;
function Range_Checks_Suppressed (E : Entity_Id) return Boolean is
begin
return Scope_Suppress.Range_Checks
or else (Present (E) and then Suppress_Range_Checks (E))
or else Vax_Float (E);
end Range_Checks_Suppressed;
procedure Remove_Checks (Expr : Node_Id) is
Discard : Traverse_Result;
function Process (N : Node_Id) return Traverse_Result;
function Traverse is new Traverse_Func (Process);
function Process (N : Node_Id) return Traverse_Result is
begin
if Nkind (N) not in N_Subexpr then
return Skip;
end if;
Set_Do_Range_Check (N, False);
case Nkind (N) is
when N_And_Then =>
Discard := Traverse (Left_Opnd (N));
return Skip;
when N_Attribute_Reference =>
Set_Do_Access_Check (N, False);
Set_Do_Overflow_Check (N, False);
when N_Explicit_Dereference =>
Set_Do_Access_Check (N, False);
when N_Function_Call =>
Set_Do_Tag_Check (N, False);
when N_Indexed_Component =>
Set_Do_Access_Check (N, False);
when N_Op =>
Set_Do_Overflow_Check (N, False);
case Nkind (N) is
when N_Op_Divide =>
Set_Do_Division_Check (N, False);
when N_Op_And =>
Set_Do_Length_Check (N, False);
when N_Op_Mod =>
Set_Do_Division_Check (N, False);
when N_Op_Or =>
Set_Do_Length_Check (N, False);
when N_Op_Rem =>
Set_Do_Division_Check (N, False);
when N_Op_Xor =>
Set_Do_Length_Check (N, False);
when others =>
null;
end case;
when N_Or_Else =>
Discard := Traverse (Left_Opnd (N));
return Skip;
when N_Selected_Component =>
Set_Do_Access_Check (N, False);
Set_Do_Discriminant_Check (N, False);
when N_Slice =>
Set_Do_Access_Check (N, False);
when N_Type_Conversion =>
Set_Do_Length_Check (N, False);
Set_Do_Overflow_Check (N, False);
Set_Do_Tag_Check (N, False);
when others =>
null;
end case;
return OK;
end Process;
begin
Discard := Traverse (Expr);
end Remove_Checks;
function Selected_Length_Checks
(Ck_Node : Node_Id;
Target_Typ : Entity_Id;
Source_Typ : Entity_Id;
Warn_Node : Node_Id)
return Check_Result
is
Loc : constant Source_Ptr := Sloc (Ck_Node);
S_Typ : Entity_Id;
T_Typ : Entity_Id;
Expr_Actual : Node_Id;
Exptyp : Entity_Id;
Cond : Node_Id := Empty;
Do_Access : Boolean := False;
Wnode : Node_Id := Warn_Node;
Ret_Result : Check_Result := (Empty, Empty);
Num_Checks : Natural := 0;
procedure Add_Check (N : Node_Id);
function Get_E_Length (E : Entity_Id; Indx : Nat) return Node_Id;
function Get_N_Length (N : Node_Id; Indx : Nat) return Node_Id;
function Same_Bounds (L : Node_Id; R : Node_Id) return Boolean;
function Length_E_Cond
(Exptyp : Entity_Id;
Typ : Entity_Id;
Indx : Nat)
return Node_Id;
function Length_N_Cond
(Expr : Node_Id;
Typ : Entity_Id;
Indx : Nat)
return Node_Id;
procedure Add_Check (N : Node_Id) is
begin
if Present (N) then
if Num_Checks = 2 then
return;
end if;
pragma Assert (Num_Checks <= 1);
Num_Checks := Num_Checks + 1;
Ret_Result (Num_Checks) := N;
end if;
end Add_Check;
function Get_E_Length (E : Entity_Id; Indx : Nat) return Node_Id is
N : Node_Id;
E1 : Entity_Id := E;
Pt : Entity_Id := Scope (Scope (E));
begin
if Ekind (Scope (E)) = E_Record_Type
and then Has_Discriminants (Scope (E))
then
N := Build_Discriminal_Subtype_Of_Component (E);
if Present (N) then
Insert_Action (Ck_Node, N);
E1 := Defining_Identifier (N);
end if;
end if;
if Ekind (E1) = E_String_Literal_Subtype then
return
Make_Integer_Literal (Loc,
Intval => String_Literal_Length (E1));
elsif Ekind (Pt) = E_Protected_Type
and then Has_Discriminants (Pt)
and then Has_Completion (Pt)
and then not Inside_Init_Proc
then
declare
Indx_Type : Node_Id;
Lo : Node_Id;
Hi : Node_Id;
Do_Expand : Boolean := False;
begin
Indx_Type := First_Index (E);
for J in 1 .. Indx - 1 loop
Next_Index (Indx_Type);
end loop;
Get_Index_Bounds (Indx_Type, Lo, Hi);
if Nkind (Lo) = N_Identifier
and then Ekind (Entity (Lo)) = E_In_Parameter
then
Lo := Get_Discriminal (E, Lo);
Do_Expand := True;
end if;
if Nkind (Hi) = N_Identifier
and then Ekind (Entity (Hi)) = E_In_Parameter
then
Hi := Get_Discriminal (E, Hi);
Do_Expand := True;
end if;
if Do_Expand then
if not Is_Entity_Name (Lo) then
Lo := Duplicate_Subexpr (Lo);
end if;
if not Is_Entity_Name (Hi) then
Lo := Duplicate_Subexpr (Hi);
end if;
N :=
Make_Op_Add (Loc,
Left_Opnd =>
Make_Op_Subtract (Loc,
Left_Opnd => Hi,
Right_Opnd => Lo),
Right_Opnd => Make_Integer_Literal (Loc, 1));
return N;
else
N :=
Make_Attribute_Reference (Loc,
Attribute_Name => Name_Length,
Prefix =>
New_Occurrence_Of (E1, Loc));
if Indx > 1 then
Set_Expressions (N, New_List (
Make_Integer_Literal (Loc, Indx)));
end if;
return N;
end if;
end;
else
N :=
Make_Attribute_Reference (Loc,
Attribute_Name => Name_Length,
Prefix =>
New_Occurrence_Of (E1, Loc));
if Indx > 1 then
Set_Expressions (N, New_List (
Make_Integer_Literal (Loc, Indx)));
end if;
return N;
end if;
end Get_E_Length;
function Get_N_Length (N : Node_Id; Indx : Nat) return Node_Id is
begin
return
Make_Attribute_Reference (Loc,
Attribute_Name => Name_Length,
Prefix =>
Duplicate_Subexpr (N, Name_Req => True),
Expressions => New_List (
Make_Integer_Literal (Loc, Indx)));
end Get_N_Length;
function Length_E_Cond
(Exptyp : Entity_Id;
Typ : Entity_Id;
Indx : Nat)
return Node_Id
is
begin
return
Make_Op_Ne (Loc,
Left_Opnd => Get_E_Length (Typ, Indx),
Right_Opnd => Get_E_Length (Exptyp, Indx));
end Length_E_Cond;
function Length_N_Cond
(Expr : Node_Id;
Typ : Entity_Id;
Indx : Nat)
return Node_Id
is
begin
return
Make_Op_Ne (Loc,
Left_Opnd => Get_E_Length (Typ, Indx),
Right_Opnd => Get_N_Length (Expr, Indx));
end Length_N_Cond;
function Same_Bounds (L : Node_Id; R : Node_Id) return Boolean is
begin
return
(Nkind (L) = N_Integer_Literal
and then Nkind (R) = N_Integer_Literal
and then Intval (L) = Intval (R))
or else
(Is_Entity_Name (L)
and then Ekind (Entity (L)) = E_Constant
and then ((Is_Entity_Name (R)
and then Entity (L) = Entity (R))
or else
(Nkind (R) = N_Type_Conversion
and then Is_Entity_Name (Expression (R))
and then Entity (L) = Entity (Expression (R)))))
or else
(Is_Entity_Name (R)
and then Ekind (Entity (R)) = E_Constant
and then Nkind (L) = N_Type_Conversion
and then Is_Entity_Name (Expression (L))
and then Entity (R) = Entity (Expression (L)))
or else
(Is_Entity_Name (L)
and then Is_Entity_Name (R)
and then Entity (L) = Entity (R)
and then Ekind (Entity (L)) = E_In_Parameter
and then Inside_Init_Proc);
end Same_Bounds;
begin
if not Expander_Active then
return Ret_Result;
end if;
if Target_Typ = Any_Type
or else Target_Typ = Any_Composite
or else Raises_Constraint_Error (Ck_Node)
then
return Ret_Result;
end if;
if No (Wnode) then
Wnode := Ck_Node;
end if;
T_Typ := Target_Typ;
if No (Source_Typ) then
S_Typ := Etype (Ck_Node);
else
S_Typ := Source_Typ;
end if;
if S_Typ = Any_Type or else S_Typ = Any_Composite then
return Ret_Result;
end if;
if Is_Access_Type (T_Typ) and then Is_Access_Type (S_Typ) then
S_Typ := Designated_Type (S_Typ);
T_Typ := Designated_Type (T_Typ);
Do_Access := True;
if Nkind (Ck_Node) = N_Null then
return Ret_Result;
end if;
end if;
if Is_Array_Type (T_Typ) and then Is_Array_Type (S_Typ) then
if Is_Constrained (T_Typ) then
Freeze_Before (Ck_Node, T_Typ);
Expr_Actual := Get_Referenced_Object (Ck_Node);
Exptyp := Get_Actual_Subtype (Expr_Actual);
if Is_Access_Type (Exptyp) then
Exptyp := Designated_Type (Exptyp);
end if;
if Nkind (Expr_Actual) = N_String_Literal then
Cond :=
Make_Op_Ne (Loc,
Left_Opnd => Get_E_Length (T_Typ, 1),
Right_Opnd =>
Make_Integer_Literal (Loc,
Intval =>
String_Literal_Length (Etype (Expr_Actual))));
elsif Is_Constrained (Exptyp) then
declare
L_Index : Node_Id;
R_Index : Node_Id;
Ndims : Nat := Number_Dimensions (T_Typ);
L_Low : Node_Id;
L_High : Node_Id;
R_Low : Node_Id;
R_High : Node_Id;
L_Length : Uint;
R_Length : Uint;
begin
L_Index := First_Index (T_Typ);
R_Index := First_Index (Exptyp);
for Indx in 1 .. Ndims loop
if not (Nkind (L_Index) = N_Raise_Constraint_Error
or else
Nkind (R_Index) = N_Raise_Constraint_Error)
then
Get_Index_Bounds (L_Index, L_Low, L_High);
Get_Index_Bounds (R_Index, R_Low, R_High);
if not Do_Access
and then Compile_Time_Known_Value (L_Low)
and then Compile_Time_Known_Value (L_High)
and then Compile_Time_Known_Value (R_Low)
and then Compile_Time_Known_Value (R_High)
then
if Expr_Value (L_High) >= Expr_Value (L_Low) then
L_Length := Expr_Value (L_High) -
Expr_Value (L_Low) + 1;
else
L_Length := UI_From_Int (0);
end if;
if Expr_Value (R_High) >= Expr_Value (R_Low) then
R_Length := Expr_Value (R_High) -
Expr_Value (R_Low) + 1;
else
R_Length := UI_From_Int (0);
end if;
if L_Length > R_Length then
Add_Check
(Compile_Time_Constraint_Error
(Wnode, "too few elements for}?", T_Typ));
elsif L_Length < R_Length then
Add_Check
(Compile_Time_Constraint_Error
(Wnode, "too many elements for}?", T_Typ));
end if;
elsif not
Subtypes_Statically_Match
(Etype (L_Index), Etype (R_Index))
and then not
(Same_Bounds (L_Low, R_Low)
and then Same_Bounds (L_High, R_High))
then
Evolve_Or_Else
(Cond, Length_E_Cond (Exptyp, T_Typ, Indx));
end if;
Next (L_Index);
Next (R_Index);
end if;
end loop;
end;
else
declare
Ndims : Nat := Number_Dimensions (T_Typ);
begin
for Indx in 1 .. Ndims loop
Evolve_Or_Else
(Cond, Length_N_Cond (Ck_Node, T_Typ, Indx));
end loop;
end;
end if;
end if;
end if;
if Present (Cond) then
if Do_Access then
Cond := Guard_Access (Cond, Loc, Ck_Node);
end if;
Add_Check
(Make_Raise_Constraint_Error (Loc,
Condition => Cond,
Reason => CE_Length_Check_Failed));
end if;
return Ret_Result;
end Selected_Length_Checks;
function Selected_Range_Checks
(Ck_Node : Node_Id;
Target_Typ : Entity_Id;
Source_Typ : Entity_Id;
Warn_Node : Node_Id)
return Check_Result
is
Loc : constant Source_Ptr := Sloc (Ck_Node);
S_Typ : Entity_Id;
T_Typ : Entity_Id;
Expr_Actual : Node_Id;
Exptyp : Entity_Id;
Cond : Node_Id := Empty;
Do_Access : Boolean := False;
Wnode : Node_Id := Warn_Node;
Ret_Result : Check_Result := (Empty, Empty);
Num_Checks : Integer := 0;
procedure Add_Check (N : Node_Id);
function Discrete_Range_Cond
(Expr : Node_Id;
Typ : Entity_Id)
return Node_Id;
function Discrete_Expr_Cond
(Expr : Node_Id;
Typ : Entity_Id)
return Node_Id;
function Get_E_First_Or_Last
(E : Entity_Id;
Indx : Nat;
Nam : Name_Id)
return Node_Id;
function Get_N_First (N : Node_Id; Indx : Nat) return Node_Id;
function Get_N_Last (N : Node_Id; Indx : Nat) return Node_Id;
function Range_E_Cond
(Exptyp : Entity_Id;
Typ : Entity_Id;
Indx : Nat)
return Node_Id;
function Range_Equal_E_Cond
(Exptyp : Entity_Id;
Typ : Entity_Id;
Indx : Nat)
return Node_Id;
function Range_N_Cond
(Expr : Node_Id;
Typ : Entity_Id;
Indx : Nat)
return Node_Id;
procedure Add_Check (N : Node_Id) is
begin
if Present (N) then
if Num_Checks = 2 then
return;
end if;
pragma Assert (Num_Checks <= 1);
Num_Checks := Num_Checks + 1;
Ret_Result (Num_Checks) := N;
end if;
end Add_Check;
function Discrete_Expr_Cond
(Expr : Node_Id;
Typ : Entity_Id)
return Node_Id
is
begin
return
Make_Or_Else (Loc,
Left_Opnd =>
Make_Op_Lt (Loc,
Left_Opnd =>
Convert_To (Base_Type (Typ), Duplicate_Subexpr (Expr)),
Right_Opnd =>
Convert_To (Base_Type (Typ),
Get_E_First_Or_Last (Typ, 0, Name_First))),
Right_Opnd =>
Make_Op_Gt (Loc,
Left_Opnd =>
Convert_To (Base_Type (Typ), Duplicate_Subexpr (Expr)),
Right_Opnd =>
Convert_To
(Base_Type (Typ),
Get_E_First_Or_Last (Typ, 0, Name_Last))));
end Discrete_Expr_Cond;
function Discrete_Range_Cond
(Expr : Node_Id;
Typ : Entity_Id)
return Node_Id
is
LB : Node_Id := Low_Bound (Expr);
HB : Node_Id := High_Bound (Expr);
Left_Opnd : Node_Id;
Right_Opnd : Node_Id;
begin
if Nkind (LB) = N_Identifier
and then Ekind (Entity (LB)) = E_Discriminant then
LB := New_Occurrence_Of (Discriminal (Entity (LB)), Loc);
end if;
if Nkind (HB) = N_Identifier
and then Ekind (Entity (HB)) = E_Discriminant then
HB := New_Occurrence_Of (Discriminal (Entity (HB)), Loc);
end if;
Left_Opnd :=
Make_Op_Lt (Loc,
Left_Opnd =>
Convert_To
(Base_Type (Typ), Duplicate_Subexpr (LB)),
Right_Opnd =>
Convert_To
(Base_Type (Typ), Get_E_First_Or_Last (Typ, 0, Name_First)));
if Base_Type (Typ) = Typ then
return Left_Opnd;
elsif Compile_Time_Known_Value (High_Bound (Scalar_Range (Typ)))
and then
Compile_Time_Known_Value (High_Bound (Scalar_Range
(Base_Type (Typ))))
then
if Is_Floating_Point_Type (Typ) then
if Expr_Value_R (High_Bound (Scalar_Range (Typ))) =
Expr_Value_R (High_Bound (Scalar_Range (Base_Type (Typ))))
then
return Left_Opnd;
end if;
else
if Expr_Value (High_Bound (Scalar_Range (Typ))) =
Expr_Value (High_Bound (Scalar_Range (Base_Type (Typ))))
then
return Left_Opnd;
end if;
end if;
end if;
Right_Opnd :=
Make_Op_Gt (Loc,
Left_Opnd =>
Convert_To
(Base_Type (Typ), Duplicate_Subexpr (HB)),
Right_Opnd =>
Convert_To
(Base_Type (Typ),
Get_E_First_Or_Last (Typ, 0, Name_Last)));
return Make_Or_Else (Loc, Left_Opnd, Right_Opnd);
end Discrete_Range_Cond;
function Get_E_First_Or_Last
(E : Entity_Id;
Indx : Nat;
Nam : Name_Id)
return Node_Id
is
N : Node_Id;
LB : Node_Id;
HB : Node_Id;
Bound : Node_Id;
begin
if Is_Array_Type (E) then
N := First_Index (E);
for J in 2 .. Indx loop
Next_Index (N);
end loop;
else
N := Scalar_Range (E);
end if;
if Nkind (N) = N_Subtype_Indication then
LB := Low_Bound (Range_Expression (Constraint (N)));
HB := High_Bound (Range_Expression (Constraint (N)));
elsif Is_Entity_Name (N) then
LB := Type_Low_Bound (Etype (N));
HB := Type_High_Bound (Etype (N));
else
LB := Low_Bound (N);
HB := High_Bound (N);
end if;
if Nam = Name_First then
Bound := LB;
else
Bound := HB;
end if;
if Nkind (Bound) = N_Identifier
and then Ekind (Entity (Bound)) = E_Discriminant
then
return New_Occurrence_Of (Discriminal (Entity (Bound)), Loc);
elsif Nkind (Bound) = N_Identifier
and then Ekind (Entity (Bound)) = E_In_Parameter
and then not Inside_Init_Proc
then
return Get_Discriminal (E, Bound);
elsif Nkind (Bound) = N_Integer_Literal then
return Make_Integer_Literal (Loc, Intval (Bound));
else
return Duplicate_Subexpr (Bound);
end if;
end Get_E_First_Or_Last;
function Get_N_First (N : Node_Id; Indx : Nat) return Node_Id is
begin
return
Make_Attribute_Reference (Loc,
Attribute_Name => Name_First,
Prefix =>
Duplicate_Subexpr (N, Name_Req => True),
Expressions => New_List (
Make_Integer_Literal (Loc, Indx)));
end Get_N_First;
function Get_N_Last (N : Node_Id; Indx : Nat) return Node_Id is
begin
return
Make_Attribute_Reference (Loc,
Attribute_Name => Name_Last,
Prefix =>
Duplicate_Subexpr (N, Name_Req => True),
Expressions => New_List (
Make_Integer_Literal (Loc, Indx)));
end Get_N_Last;
function Range_E_Cond
(Exptyp : Entity_Id;
Typ : Entity_Id;
Indx : Nat)
return Node_Id
is
begin
return
Make_Or_Else (Loc,
Left_Opnd =>
Make_Op_Lt (Loc,
Left_Opnd => Get_E_First_Or_Last (Exptyp, Indx, Name_First),
Right_Opnd => Get_E_First_Or_Last (Typ, Indx, Name_First)),
Right_Opnd =>
Make_Op_Gt (Loc,
Left_Opnd => Get_E_First_Or_Last (Exptyp, Indx, Name_Last),
Right_Opnd => Get_E_First_Or_Last (Typ, Indx, Name_Last)));
end Range_E_Cond;
function Range_Equal_E_Cond
(Exptyp : Entity_Id;
Typ : Entity_Id;
Indx : Nat)
return Node_Id
is
begin
return
Make_Or_Else (Loc,
Left_Opnd =>
Make_Op_Ne (Loc,
Left_Opnd => Get_E_First_Or_Last (Exptyp, Indx, Name_First),
Right_Opnd => Get_E_First_Or_Last (Typ, Indx, Name_First)),
Right_Opnd =>
Make_Op_Ne (Loc,
Left_Opnd => Get_E_First_Or_Last (Exptyp, Indx, Name_Last),
Right_Opnd => Get_E_First_Or_Last (Typ, Indx, Name_Last)));
end Range_Equal_E_Cond;
function Range_N_Cond
(Expr : Node_Id;
Typ : Entity_Id;
Indx : Nat)
return Node_Id
is
begin
return
Make_Or_Else (Loc,
Left_Opnd =>
Make_Op_Lt (Loc,
Left_Opnd => Get_N_First (Expr, Indx),
Right_Opnd => Get_E_First_Or_Last (Typ, Indx, Name_First)),
Right_Opnd =>
Make_Op_Gt (Loc,
Left_Opnd => Get_N_Last (Expr, Indx),
Right_Opnd => Get_E_First_Or_Last (Typ, Indx, Name_Last)));
end Range_N_Cond;
begin
if not Expander_Active then
return Ret_Result;
end if;
if Target_Typ = Any_Type
or else Target_Typ = Any_Composite
or else Raises_Constraint_Error (Ck_Node)
then
return Ret_Result;
end if;
if No (Wnode) then
Wnode := Ck_Node;
end if;
T_Typ := Target_Typ;
if No (Source_Typ) then
S_Typ := Etype (Ck_Node);
else
S_Typ := Source_Typ;
end if;
if S_Typ = Any_Type or else S_Typ = Any_Composite then
return Ret_Result;
end if;
if Is_Access_Type (T_Typ) and then Is_Access_Type (S_Typ) then
S_Typ := Designated_Type (S_Typ);
T_Typ := Designated_Type (T_Typ);
Do_Access := True;
if Nkind (Ck_Node) = N_Null then
return Ret_Result;
end if;
end if;
if Nkind (Ck_Node) = N_Range then
if Ck_Node = Scalar_Range (T_Typ) then
return Ret_Result;
end if;
declare
T_LB : constant Node_Id := Type_Low_Bound (T_Typ);
T_HB : constant Node_Id := Type_High_Bound (T_Typ);
LB : constant Node_Id := Low_Bound (Ck_Node);
HB : constant Node_Id := High_Bound (Ck_Node);
Null_Range : Boolean;
Out_Of_Range_L : Boolean;
Out_Of_Range_H : Boolean;
begin
if Compile_Time_Known_Value (LB)
and then Compile_Time_Known_Value (HB)
and then Compile_Time_Known_Value (T_LB)
and then Compile_Time_Known_Value (T_HB)
and then not Do_Access
then
if Is_Floating_Point_Type (S_Typ) then
Null_Range := Expr_Value_R (HB) < Expr_Value_R (LB);
Out_Of_Range_L :=
(Expr_Value_R (LB) < Expr_Value_R (T_LB))
or else
(Expr_Value_R (LB) > Expr_Value_R (T_HB));
Out_Of_Range_H :=
(Expr_Value_R (HB) > Expr_Value_R (T_HB))
or else
(Expr_Value_R (HB) < Expr_Value_R (T_LB));
else
Null_Range := Expr_Value (HB) < Expr_Value (LB);
Out_Of_Range_L :=
(Expr_Value (LB) < Expr_Value (T_LB))
or else
(Expr_Value (LB) > Expr_Value (T_HB));
Out_Of_Range_H :=
(Expr_Value (HB) > Expr_Value (T_HB))
or else
(Expr_Value (HB) < Expr_Value (T_LB));
end if;
if not Null_Range then
if Out_Of_Range_L then
if No (Warn_Node) then
Add_Check
(Compile_Time_Constraint_Error
(Low_Bound (Ck_Node),
"static value out of range of}?", T_Typ));
else
Add_Check
(Compile_Time_Constraint_Error
(Wnode,
"static range out of bounds of}?", T_Typ));
end if;
end if;
if Out_Of_Range_H then
if No (Warn_Node) then
Add_Check
(Compile_Time_Constraint_Error
(High_Bound (Ck_Node),
"static value out of range of}?", T_Typ));
else
Add_Check
(Compile_Time_Constraint_Error
(Wnode,
"static range out of bounds of}?", T_Typ));
end if;
end if;
end if;
else
declare
LB : Node_Id := Low_Bound (Ck_Node);
HB : Node_Id := High_Bound (Ck_Node);
begin
if Nkind (LB) = N_Identifier
and then Ekind (Entity (LB)) = E_Discriminant
then
if Current_Scope = Scope (Entity (LB)) then
return Ret_Result;
else
LB :=
New_Occurrence_Of (Discriminal (Entity (LB)), Loc);
end if;
end if;
if Nkind (HB) = N_Identifier
and then Ekind (Entity (HB)) = E_Discriminant
then
if Current_Scope = Scope (Entity (HB)) then
return Ret_Result;
else
HB :=
New_Occurrence_Of (Discriminal (Entity (HB)), Loc);
end if;
end if;
Cond := Discrete_Range_Cond (Ck_Node, T_Typ);
Set_Paren_Count (Cond, 1);
Cond :=
Make_And_Then (Loc,
Left_Opnd =>
Make_Op_Ge (Loc,
Left_Opnd => Duplicate_Subexpr (HB),
Right_Opnd => Duplicate_Subexpr (LB)),
Right_Opnd => Cond);
end;
end if;
end;
elsif Is_Scalar_Type (S_Typ) then
if Ekind (Base_Type (S_Typ)) /= Ekind (Base_Type (T_Typ)) then
Cond := Discrete_Expr_Cond (Ck_Node, T_Typ);
elsif Compile_Time_Known_Value (Ck_Node)
and then not Do_Access
then
declare
LB : constant Node_Id := Type_Low_Bound (T_Typ);
UB : constant Node_Id := Type_High_Bound (T_Typ);
Out_Of_Range : Boolean;
Static_Bounds : constant Boolean :=
Compile_Time_Known_Value (LB)
and Compile_Time_Known_Value (UB);
begin
if Static_Bounds then
if Is_Floating_Point_Type (S_Typ) then
Out_Of_Range :=
(Expr_Value_R (Ck_Node) < Expr_Value_R (LB))
or else
(Expr_Value_R (Ck_Node) > Expr_Value_R (UB));
else Out_Of_Range :=
Expr_Value (Ck_Node) < Expr_Value (LB)
or else
Expr_Value (Ck_Node) > Expr_Value (UB);
end if;
if Out_Of_Range then
if No (Warn_Node) then
Add_Check
(Compile_Time_Constraint_Error
(Ck_Node,
"static value out of range of}?", T_Typ));
else
Add_Check
(Compile_Time_Constraint_Error
(Wnode,
"static value out of range of}?", T_Typ));
end if;
end if;
else
Cond := Discrete_Expr_Cond (Ck_Node, T_Typ);
end if;
end;
else
if not In_Subrange_Of (S_Typ, T_Typ) then
Cond := Discrete_Expr_Cond (Ck_Node, T_Typ);
end if;
end if;
end if;
if Is_Array_Type (T_Typ) and then Is_Array_Type (S_Typ) then
if Is_Constrained (T_Typ) then
Expr_Actual := Get_Referenced_Object (Ck_Node);
Exptyp := Get_Actual_Subtype (Expr_Actual);
if Is_Access_Type (Exptyp) then
Exptyp := Designated_Type (Exptyp);
end if;
if Nkind (Expr_Actual) = N_String_Literal then
null;
elsif Is_Constrained (Exptyp) then
declare
L_Index : Node_Id;
R_Index : Node_Id;
Ndims : Nat := Number_Dimensions (T_Typ);
L_Low : Node_Id;
L_High : Node_Id;
R_Low : Node_Id;
R_High : Node_Id;
begin
L_Index := First_Index (T_Typ);
R_Index := First_Index (Exptyp);
for Indx in 1 .. Ndims loop
if not (Nkind (L_Index) = N_Raise_Constraint_Error
or else
Nkind (R_Index) = N_Raise_Constraint_Error)
then
Get_Index_Bounds (L_Index, L_Low, L_High);
Get_Index_Bounds (R_Index, R_Low, R_High);
if not
Subtypes_Statically_Match
(Etype (L_Index), Etype (R_Index))
then
if Is_Constrained (T_Typ) then
Evolve_Or_Else
(Cond,
Range_Equal_E_Cond (Exptyp, T_Typ, Indx));
else
Evolve_Or_Else
(Cond, Range_E_Cond (Exptyp, T_Typ, Indx));
end if;
end if;
Next (L_Index);
Next (R_Index);
end if;
end loop;
end;
else
declare
Ndims : Nat := Number_Dimensions (T_Typ);
begin
for Indx in 1 .. Ndims loop
Evolve_Or_Else
(Cond, Range_N_Cond (Ck_Node, T_Typ, Indx));
end loop;
end;
end if;
else
if Nkind (Parent (Ck_Node)) = N_Type_Conversion then
declare
Opnd_Index : Node_Id;
Targ_Index : Node_Id;
begin
Opnd_Index
:= First_Index (Get_Actual_Subtype (Ck_Node));
Targ_Index := First_Index (T_Typ);
while Opnd_Index /= Empty loop
if Nkind (Opnd_Index) = N_Range then
if Is_In_Range
(Low_Bound (Opnd_Index), Etype (Targ_Index))
and then
Is_In_Range
(High_Bound (Opnd_Index), Etype (Targ_Index))
then
null;
elsif Is_Out_Of_Range
(Low_Bound (Opnd_Index), Etype (Targ_Index))
or else
Is_Out_Of_Range
(High_Bound (Opnd_Index), Etype (Targ_Index))
then
Add_Check
(Compile_Time_Constraint_Error
(Wnode, "value out of range of}?", T_Typ));
else
Evolve_Or_Else
(Cond,
Discrete_Range_Cond
(Opnd_Index, Etype (Targ_Index)));
end if;
end if;
Next_Index (Opnd_Index);
Next_Index (Targ_Index);
end loop;
end;
end if;
end if;
end if;
if Present (Cond) then
if Do_Access then
Cond := Guard_Access (Cond, Loc, Ck_Node);
end if;
Add_Check
(Make_Raise_Constraint_Error (Loc,
Condition => Cond,
Reason => CE_Range_Check_Failed));
end if;
return Ret_Result;
end Selected_Range_Checks;
function Storage_Checks_Suppressed (E : Entity_Id) return Boolean is
begin
return Scope_Suppress.Storage_Checks
or else (Present (E) and then Suppress_Storage_Checks (E));
end Storage_Checks_Suppressed;
function Tag_Checks_Suppressed (E : Entity_Id) return Boolean is
begin
return Scope_Suppress.Tag_Checks
or else (Present (E) and then Suppress_Tag_Checks (E));
end Tag_Checks_Suppressed;
end Checks;