2400 lines
121 KiB
Ada
2400 lines
121 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S E M _ U T I L --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1992-2016, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING3. If not, go to --
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-- http://www.gnu.org/licenses for a complete copy of the license. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- Package containing utility procedures used throughout the semantics
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with Einfo; use Einfo;
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with Exp_Tss; use Exp_Tss;
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with Namet; use Namet;
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with Opt; use Opt;
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with Snames; use Snames;
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with Types; use Types;
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with Uintp; use Uintp;
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with Urealp; use Urealp;
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package Sem_Util is
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function Abstract_Interface_List (Typ : Entity_Id) return List_Id;
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-- Given a type that implements interfaces look for its associated
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-- definition node and return its list of interfaces.
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procedure Add_Access_Type_To_Process (E : Entity_Id; A : Entity_Id);
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-- Add A to the list of access types to process when expanding the
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-- freeze node of E.
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procedure Add_Block_Identifier (N : Node_Id; Id : out Entity_Id);
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-- Given a block statement N, generate an internal E_Block label and make
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-- it the identifier of the block. Id denotes the generated entity. If the
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-- block already has an identifier, Id returns the entity of its label.
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procedure Add_Global_Declaration (N : Node_Id);
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-- These procedures adds a declaration N at the library level, to be
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-- elaborated before any other code in the unit. It is used for example
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-- for the entity that marks whether a unit has been elaborated. The
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-- declaration is added to the Declarations list of the Aux_Decls_Node
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-- for the current unit. The declarations are added in the current scope,
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-- so the caller should push a new scope as required before the call.
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function Add_Suffix (E : Entity_Id; Suffix : Character) return Name_Id;
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-- Returns the name of E adding Suffix
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function Address_Integer_Convert_OK (T1, T2 : Entity_Id) return Boolean;
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-- Given two types, returns True if we are in Allow_Integer_Address mode
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-- and one of the types is (a descendant of) System.Address (and this type
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-- is private), and the other type is any integer type.
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function Address_Value (N : Node_Id) return Node_Id;
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-- Return the underlying value of the expression N of an address clause
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function Addressable (V : Uint) return Boolean;
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function Addressable (V : Int) return Boolean;
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pragma Inline (Addressable);
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-- Returns True if the value of V is the word size or an addressable factor
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-- of the word size (typically 8, 16, 32 or 64).
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procedure Aggregate_Constraint_Checks
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(Exp : Node_Id;
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Check_Typ : Entity_Id);
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-- Checks expression Exp against subtype Check_Typ. If Exp is an aggregate
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-- and Check_Typ a constrained record type with discriminants, we generate
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-- the appropriate discriminant checks. If Exp is an array aggregate then
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-- emit the appropriate length checks. If Exp is a scalar type, or a string
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-- literal, Exp is changed into Check_Typ'(Exp) to ensure that range checks
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-- are performed at run time. Also used for expressions in the argument of
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-- 'Update, which shares some of the features of an aggregate.
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function Alignment_In_Bits (E : Entity_Id) return Uint;
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-- If the alignment of the type or object E is currently known to the
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-- compiler, then this function returns the alignment value in bits.
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-- Otherwise Uint_0 is returned, indicating that the alignment of the
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-- entity is not yet known to the compiler.
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function All_Composite_Constraints_Static (Constr : Node_Id) return Boolean;
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-- Used to implement pragma Restrictions (No_Dynamic_Sized_Objects).
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-- Given a constraint or subtree of a constraint on a composite
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-- subtype/object, returns True if there are no nonstatic constraints,
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-- which might cause objects to be created with dynamic size.
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-- Called for subtype declarations (including implicit ones created for
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-- subtype indications in object declarations, as well as discriminated
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-- record aggregate cases). For record aggregates, only records containing
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-- discriminant-dependent arrays matter, because the discriminants must be
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-- static when governing a variant part. Access discriminants are
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-- irrelevant. Also called for array aggregates, but only named notation,
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-- because those are the only dynamic cases.
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procedure Append_Inherited_Subprogram (S : Entity_Id);
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-- If the parent of the operation is declared in the visible part of
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-- the current scope, the inherited operation is visible even though the
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-- derived type that inherits the operation may be completed in the private
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-- part of the current package.
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procedure Apply_Compile_Time_Constraint_Error
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(N : Node_Id;
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Msg : String;
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Reason : RT_Exception_Code;
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Ent : Entity_Id := Empty;
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Typ : Entity_Id := Empty;
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Loc : Source_Ptr := No_Location;
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Rep : Boolean := True;
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Warn : Boolean := False);
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-- N is a subexpression which will raise constraint error when evaluated
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-- at runtime. Msg is a message that explains the reason for raising the
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-- exception. The last character is ? if the message is always a warning,
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-- even in Ada 95, and is not a ? if the message represents an illegality
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-- (because of violation of static expression rules) in Ada 95 (but not
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-- in Ada 83). Typically this routine posts all messages at the Sloc of
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-- node N. However, if Loc /= No_Location, Loc is the Sloc used to output
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-- the message. After posting the appropriate message, and if the flag
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-- Rep is set, this routine replaces the expression with an appropriate
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-- N_Raise_Constraint_Error node using the given Reason code. This node
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-- is then marked as being static if the original node is static, but
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-- sets the flag Raises_Constraint_Error, preventing further evaluation.
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-- The error message may contain a } or & insertion character. This
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-- normally references Etype (N), unless the Ent argument is given
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-- explicitly, in which case it is used instead. The type of the raise
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-- node that is built is normally Etype (N), but if the Typ parameter
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-- is present, this is used instead. Warn is normally False. If it is
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-- True then the message is treated as a warning even though it does
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-- not end with a ? (this is used when the caller wants to parameterize
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-- whether an error or warning is given), or when the message should be
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-- treated as a warning even when SPARK_Mode is On (which otherwise would
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-- force an error).
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function Async_Readers_Enabled (Id : Entity_Id) return Boolean;
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-- Given the entity of an abstract state or a variable, determine whether
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-- Id is subject to external property Async_Readers and if it is, the
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-- related expression evaluates to True.
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function Async_Writers_Enabled (Id : Entity_Id) return Boolean;
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-- Given the entity of an abstract state or a variable, determine whether
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-- Id is subject to external property Async_Writers and if it is, the
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-- related expression evaluates to True.
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function Available_Full_View_Of_Component (T : Entity_Id) return Boolean;
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-- If at the point of declaration an array type has a private or limited
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-- component, several array operations are not avaiable on the type, and
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-- the array type is flagged accordingly. If in the immediate scope of
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-- the array type the component becomes non-private or non-limited, these
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-- operations become avaiable. This can happen if the scopes of both types
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-- are open, and the scope of the array is not outside the scope of the
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-- component.
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procedure Bad_Attribute
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(N : Node_Id;
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Nam : Name_Id;
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Warn : Boolean := False);
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-- Called when node N is expected to contain a valid attribute name, and
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-- Nam is found instead. If Warn is set True this is a warning, else this
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-- is an error.
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procedure Bad_Predicated_Subtype_Use
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(Msg : String;
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N : Node_Id;
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Typ : Entity_Id;
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Suggest_Static : Boolean := False);
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-- This is called when Typ, a predicated subtype, is used in a context
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-- which does not allow the use of a predicated subtype. Msg is passed to
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-- Error_Msg_FE to output an appropriate message using N as the location,
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-- and Typ as the entity. The caller must set up any insertions other than
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-- the & for the type itself. Note that if Typ is a generic actual type,
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-- then the message will be output as a warning, and a raise Program_Error
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-- is inserted using Insert_Action with node N as the insertion point. Node
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-- N also supplies the source location for construction of the raise node.
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-- If Typ does not have any predicates, the call has no effect. Set flag
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-- Suggest_Static when the context warrants an advice on how to avoid the
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-- use error.
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function Bad_Unordered_Enumeration_Reference
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(N : Node_Id;
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T : Entity_Id) return Boolean;
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-- Node N contains a potentially dubious reference to type T, either an
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-- explicit comparison, or an explicit range. This function returns True
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-- if the type T is an enumeration type for which No pragma Order has been
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-- given, and the reference N is not in the same extended source unit as
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-- the declaration of T.
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function Build_Actual_Subtype
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(T : Entity_Id;
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N : Node_Or_Entity_Id) return Node_Id;
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-- Build an anonymous subtype for an entity or expression, using the
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-- bounds of the entity or the discriminants of the enclosing record.
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-- T is the type for which the actual subtype is required, and N is either
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-- a defining identifier, or any subexpression.
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function Build_Actual_Subtype_Of_Component
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(T : Entity_Id;
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N : Node_Id) return Node_Id;
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-- Determine whether a selected component has a type that depends on
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-- discriminants, and build actual subtype for it if so.
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function Build_Default_Init_Cond_Call
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(Loc : Source_Ptr;
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Obj_Id : Entity_Id;
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Typ : Entity_Id) return Node_Id;
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-- Build a call to the default initial condition procedure of type Typ with
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-- Obj_Id as the actual parameter.
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procedure Build_Default_Init_Cond_Procedure_Bodies (Priv_Decls : List_Id);
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-- Inspect the contents of private declarations Priv_Decls and build the
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-- bodies the default initial condition procedures for all types subject
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-- to pragma Default_Initial_Condition.
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procedure Build_Default_Init_Cond_Procedure_Declaration (Typ : Entity_Id);
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-- If private type Typ is subject to pragma Default_Initial_Condition,
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-- build the declaration of the procedure which verifies the assumption
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-- of the pragma at runtime. The declaration is inserted after the related
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-- pragma.
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function Build_Default_Subtype
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(T : Entity_Id;
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N : Node_Id) return Entity_Id;
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-- If T is an unconstrained type with defaulted discriminants, build a
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-- subtype constrained by the default values, insert the subtype
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-- declaration in the tree before N, and return the entity of that
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-- subtype. Otherwise, simply return T.
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function Build_Discriminal_Subtype_Of_Component
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(T : Entity_Id) return Node_Id;
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-- Determine whether a record component has a type that depends on
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-- discriminants, and build actual subtype for it if so.
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procedure Build_Elaboration_Entity (N : Node_Id; Spec_Id : Entity_Id);
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-- Given a compilation unit node N, allocate an elaboration counter for
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-- the compilation unit, and install it in the Elaboration_Entity field
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-- of Spec_Id, the entity for the compilation unit.
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procedure Build_Explicit_Dereference
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(Expr : Node_Id;
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Disc : Entity_Id);
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-- AI05-139: Names with implicit dereference. If the expression N is a
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-- reference type and the context imposes the corresponding designated
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-- type, convert N into N.Disc.all. Such expressions are always over-
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-- loaded with both interpretations, and the dereference interpretation
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-- carries the name of the reference discriminant.
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function Cannot_Raise_Constraint_Error (Expr : Node_Id) return Boolean;
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-- Returns True if the expression cannot possibly raise Constraint_Error.
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-- The response is conservative in the sense that a result of False does
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-- not necessarily mean that CE could be raised, but a response of True
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-- means that for sure CE cannot be raised.
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procedure Check_Dynamically_Tagged_Expression
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(Expr : Node_Id;
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Typ : Entity_Id;
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Related_Nod : Node_Id);
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-- Check wrong use of dynamically tagged expression
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procedure Check_Fully_Declared (T : Entity_Id; N : Node_Id);
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-- Verify that the full declaration of type T has been seen. If not, place
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-- error message on node N. Used in object declarations, type conversions
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-- and qualified expressions.
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procedure Check_Function_With_Address_Parameter (Subp_Id : Entity_Id);
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-- A subprogram that has an Address parameter and is declared in a Pure
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-- package is not considered Pure, because the parameter may be used as a
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-- pointer and the referenced data may change even if the address value
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-- itself does not.
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-- If the programmer gave an explicit Pure_Function pragma, then we respect
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-- the pragma and leave the subprogram Pure.
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procedure Check_Function_Writable_Actuals (N : Node_Id);
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-- (Ada 2012): If the construct N has two or more direct constituents that
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-- are names or expressions whose evaluation may occur in an arbitrary
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-- order, at least one of which contains a function call with an in out or
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-- out parameter, then the construct is legal only if: for each name that
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-- is passed as a parameter of mode in out or out to some inner function
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-- call C2 (not including the construct N itself), there is no other name
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-- anywhere within a direct constituent of the construct C other than
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-- the one containing C2, that is known to refer to the same object (RM
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-- 6.4.1(6.17/3)).
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procedure Check_Implicit_Dereference (N : Node_Id; Typ : Entity_Id);
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-- AI05-139-2: Accessors and iterators for containers. This procedure
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-- checks whether T is a reference type, and if so it adds an interprettion
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-- to N whose type is the designated type of the reference_discriminant.
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-- If N is a generalized indexing operation, the interpretation is added
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-- both to the corresponding function call, and to the indexing node.
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procedure Check_Internal_Protected_Use (N : Node_Id; Nam : Entity_Id);
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-- Within a protected function, the current object is a constant, and
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-- internal calls to a procedure or entry are illegal. Similarly, other
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-- uses of a protected procedure in a renaming or a generic instantiation
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-- in the context of a protected function are illegal (AI05-0225).
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procedure Check_Later_Vs_Basic_Declarations
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(Decls : List_Id;
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During_Parsing : Boolean);
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-- If During_Parsing is True, check for misplacement of later vs basic
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-- declarations in Ada 83. If During_Parsing is False, and the SPARK
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-- restriction is set, do the same: although SPARK 95 removes the
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-- distinction between initial and later declarative items, the distinction
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-- remains in the Examiner (JB01-005). Note that the Examiner does not
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-- count package declarations in later declarative items.
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procedure Check_No_Hidden_State (Id : Entity_Id);
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-- Determine whether object or state Id introduces a hidden state. If this
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-- is the case, emit an error.
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procedure Check_Nonvolatile_Function_Profile (Func_Id : Entity_Id);
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-- Verify that the profile of nonvolatile function Func_Id does not contain
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-- effectively volatile parameters or return type.
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procedure Check_Part_Of_Reference (Var_Id : Entity_Id; Ref : Node_Id);
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-- Verify the legality of reference Ref to variable Var_Id when the
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-- variable is a constituent of a single protected/task type.
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procedure Check_Potentially_Blocking_Operation (N : Node_Id);
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-- N is one of the statement forms that is a potentially blocking
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-- operation. If it appears within a protected action, emit warning.
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procedure Check_Result_And_Post_State (Subp_Id : Entity_Id);
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-- Determine whether the contract of subprogram Subp_Id mentions attribute
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-- 'Result and it contains an expression that evaluates differently in pre-
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-- and post-state.
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procedure Check_State_Refinements
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(Context : Node_Id;
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Is_Main_Unit : Boolean := False);
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-- Verify that all abstract states declared in a block statement, entry
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-- body, package body, protected body, subprogram body, task body, or a
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-- package declaration denoted by Context have proper refinement. Emit an
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-- error if this is not the case. Flag Is_Main_Unit should be set when
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-- Context denotes the main compilation unit.
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procedure Check_Unused_Body_States (Body_Id : Entity_Id);
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-- Verify that all abstract states and objects declared in the state space
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-- of package body Body_Id are used as constituents. Emit an error if this
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-- is not the case.
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procedure Check_Unprotected_Access
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(Context : Node_Id;
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Expr : Node_Id);
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-- Check whether the expression is a pointer to a protected component,
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-- and the context is external to the protected operation, to warn against
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-- a possible unlocked access to data.
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function Collect_Body_States (Body_Id : Entity_Id) return Elist_Id;
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-- Gather the entities of all abstract states and objects declared in the
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-- body state space of package body Body_Id.
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procedure Collect_Interfaces
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(T : Entity_Id;
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Ifaces_List : out Elist_Id;
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Exclude_Parents : Boolean := False;
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Use_Full_View : Boolean := True);
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-- Ada 2005 (AI-251): Collect whole list of abstract interfaces that are
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-- directly or indirectly implemented by T. Exclude_Parents is used to
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-- avoid the addition of inherited interfaces to the generated list.
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-- Use_Full_View is used to collect the interfaces using the full-view
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-- (if available).
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procedure Collect_Interface_Components
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(Tagged_Type : Entity_Id;
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Components_List : out Elist_Id);
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-- Ada 2005 (AI-251): Collect all the tag components associated with the
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-- secondary dispatch tables of a tagged type.
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procedure Collect_Interfaces_Info
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(T : Entity_Id;
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Ifaces_List : out Elist_Id;
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Components_List : out Elist_Id;
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Tags_List : out Elist_Id);
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-- Ada 2005 (AI-251): Collect all the interfaces associated with T plus
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-- the record component and tag associated with each of these interfaces.
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-- On exit Ifaces_List, Components_List and Tags_List have the same number
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-- of elements, and elements at the same position on these tables provide
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-- information on the same interface type.
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procedure Collect_Parents
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(T : Entity_Id;
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List : out Elist_Id;
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Use_Full_View : Boolean := True);
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-- Collect all the parents of Typ. Use_Full_View is used to collect them
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-- using the full-view of private parents (if available).
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function Collect_Primitive_Operations (T : Entity_Id) return Elist_Id;
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-- Called upon type derivation and extension. We scan the declarative part
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-- in which the type appears, and collect subprograms that have one
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-- subsidiary subtype of the type. These subprograms can only appear after
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-- the type itself.
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function Compile_Time_Constraint_Error
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(N : Node_Id;
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Msg : String;
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Ent : Entity_Id := Empty;
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Loc : Source_Ptr := No_Location;
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Warn : Boolean := False) return Node_Id;
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-- This is similar to Apply_Compile_Time_Constraint_Error in that it
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-- generates a warning (or error) message in the same manner, but it does
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-- not replace any nodes. For convenience, the function always returns its
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-- first argument. The message is a warning if the message ends with ?, or
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-- we are operating in Ada 83 mode, or the Warn parameter is set to True.
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procedure Conditional_Delay (New_Ent, Old_Ent : Entity_Id);
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-- Sets the Has_Delayed_Freeze flag of New if the Delayed_Freeze flag of
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-- Old is set and Old has no yet been Frozen (i.e. Is_Frozen is false).
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function Contains_Refined_State (Prag : Node_Id) return Boolean;
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-- Determine whether pragma Prag contains a reference to the entity of an
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-- abstract state with a visible refinement. Prag must denote one of the
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-- following pragmas:
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-- Depends
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-- Global
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function Copy_Component_List
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(R_Typ : Entity_Id;
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Loc : Source_Ptr) return List_Id;
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-- Copy components from record type R_Typ that come from source. Used to
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-- create a new compatible record type. Loc is the source location assigned
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-- to the created nodes.
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function Copy_Parameter_List (Subp_Id : Entity_Id) return List_Id;
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-- Utility to create a parameter profile for a new subprogram spec, when
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-- the subprogram has a body that acts as spec. This is done for some cases
|
|
-- of inlining, and for private protected ops. Also used to create bodies
|
|
-- for stubbed subprograms.
|
|
|
|
function Copy_Subprogram_Spec (Spec : Node_Id) return Node_Id;
|
|
-- Replicate a function or a procedure specification denoted by Spec. The
|
|
-- resulting tree is an exact duplicate of the original tree. New entities
|
|
-- are created for the unit name and the formal parameters.
|
|
|
|
function Corresponding_Generic_Type (T : Entity_Id) return Entity_Id;
|
|
-- If a type is a generic actual type, return the corresponding formal in
|
|
-- the generic parent unit. There is no direct link in the tree for this
|
|
-- attribute, except in the case of formal private and derived types.
|
|
-- Possible optimization???
|
|
|
|
function Current_Entity (N : Node_Id) return Entity_Id;
|
|
pragma Inline (Current_Entity);
|
|
-- Find the currently visible definition for a given identifier, that is to
|
|
-- say the first entry in the visibility chain for the Chars of N.
|
|
|
|
function Current_Entity_In_Scope (N : Node_Id) return Entity_Id;
|
|
-- Find whether there is a previous definition for identifier N in the
|
|
-- current scope. Because declarations for a scope are not necessarily
|
|
-- contiguous (e.g. for packages) the first entry on the visibility chain
|
|
-- for N is not necessarily in the current scope.
|
|
|
|
function Current_Scope return Entity_Id;
|
|
-- Get entity representing current scope
|
|
|
|
function Current_Scope_No_Loops return Entity_Id;
|
|
-- Return the current scope ignoring internally generated loops
|
|
|
|
function Current_Subprogram return Entity_Id;
|
|
-- Returns current enclosing subprogram. If Current_Scope is a subprogram,
|
|
-- then that is what is returned, otherwise the Enclosing_Subprogram of the
|
|
-- Current_Scope is returned. The returned value is Empty if this is called
|
|
-- from a library package which is not within any subprogram.
|
|
|
|
function Deepest_Type_Access_Level (Typ : Entity_Id) return Uint;
|
|
-- Same as Type_Access_Level, except that if the type is the type of an Ada
|
|
-- 2012 stand-alone object of an anonymous access type, then return the
|
|
-- static accesssibility level of the object. In that case, the dynamic
|
|
-- accessibility level of the object may take on values in a range. The low
|
|
-- bound of that range is returned by Type_Access_Level; this function
|
|
-- yields the high bound of that range. Also differs from Type_Access_Level
|
|
-- in the case of a descendant of a generic formal type (returns Int'Last
|
|
-- instead of 0).
|
|
|
|
function Defining_Entity
|
|
(N : Node_Id;
|
|
Empty_On_Errors : Boolean := False) return Entity_Id;
|
|
-- Given a declaration N, returns the associated defining entity. If the
|
|
-- declaration has a specification, the entity is obtained from the
|
|
-- specification. If the declaration has a defining unit name, then the
|
|
-- defining entity is obtained from the defining unit name ignoring any
|
|
-- child unit prefixes.
|
|
--
|
|
-- Iterator loops also have a defining entity, which holds the list of
|
|
-- local entities declared during loop expansion. These entities need
|
|
-- debugging information, generated through Qualify_Entity_Names, and
|
|
-- the loop declaration must be placed in the table Name_Qualify_Units.
|
|
--
|
|
-- Set flag Empty_On_Error to change the behavior of this routine as
|
|
-- follows:
|
|
--
|
|
-- * True - A declaration that lacks a defining entity returns Empty.
|
|
-- A node that does not allow for a defining entity returns Empty.
|
|
--
|
|
-- * False - A declaration that lacks a defining entity is given a new
|
|
-- internally generated entity which is subsequently returned. A node
|
|
-- that does not allow for a defining entity raises Program_Error.
|
|
--
|
|
-- The former semantics is appropriate for the back end; the latter
|
|
-- semantics is appropriate for the front end.
|
|
|
|
function Denotes_Discriminant
|
|
(N : Node_Id;
|
|
Check_Concurrent : Boolean := False) return Boolean;
|
|
-- Returns True if node N is an Entity_Name node for a discriminant. If the
|
|
-- flag Check_Concurrent is true, function also returns true when N denotes
|
|
-- the discriminal of the discriminant of a concurrent type. This is needed
|
|
-- to disable some optimizations on private components of protected types,
|
|
-- and constraint checks on entry families constrained by discriminants.
|
|
|
|
function Denotes_Same_Object (A1, A2 : Node_Id) return Boolean;
|
|
-- Detect suspicious overlapping between actuals in a call, when both are
|
|
-- writable (RM 2012 6.4.1(6.4/3))
|
|
|
|
function Denotes_Same_Prefix (A1, A2 : Node_Id) return Boolean;
|
|
-- Functions to detect suspicious overlapping between actuals in a call,
|
|
-- when one of them is writable. The predicates are those proposed in
|
|
-- AI05-0144, to detect dangerous order dependence in complex calls.
|
|
-- I would add a parameter Warn which enables more extensive testing of
|
|
-- cases as we find appropriate when we are only warning ??? Or perhaps
|
|
-- return an indication of (Error, Warn, OK) ???
|
|
|
|
function Denotes_Variable (N : Node_Id) return Boolean;
|
|
-- Returns True if node N denotes a single variable without parentheses
|
|
|
|
function Depends_On_Discriminant (N : Node_Id) return Boolean;
|
|
-- Returns True if N denotes a discriminant or if N is a range, a subtype
|
|
-- indication or a scalar subtype where one of the bounds is a
|
|
-- discriminant.
|
|
|
|
function Designate_Same_Unit
|
|
(Name1 : Node_Id;
|
|
Name2 : Node_Id) return Boolean;
|
|
-- Returns True if Name1 and Name2 designate the same unit name; each of
|
|
-- these names is supposed to be a selected component name, an expanded
|
|
-- name, a defining program unit name or an identifier.
|
|
|
|
function Dynamic_Accessibility_Level (Expr : Node_Id) return Node_Id;
|
|
-- Expr should be an expression of an access type. Builds an integer
|
|
-- literal except in cases involving anonymous access types where
|
|
-- accessibility levels are tracked at runtime (access parameters and Ada
|
|
-- 2012 stand-alone objects).
|
|
|
|
function Effective_Extra_Accessibility (Id : Entity_Id) return Entity_Id;
|
|
-- Same as Einfo.Extra_Accessibility except thtat object renames
|
|
-- are looked through.
|
|
|
|
function Effective_Reads_Enabled (Id : Entity_Id) return Boolean;
|
|
-- Given the entity of an abstract state or a variable, determine whether
|
|
-- Id is subject to external property Effective_Reads and if it is, the
|
|
-- related expression evaluates to True.
|
|
|
|
function Effective_Writes_Enabled (Id : Entity_Id) return Boolean;
|
|
-- Given the entity of an abstract state or a variable, determine whether
|
|
-- Id is subject to external property Effective_Writes and if it is, the
|
|
-- related expression evaluates to True.
|
|
|
|
function Enclosing_Comp_Unit_Node (N : Node_Id) return Node_Id;
|
|
-- Returns the enclosing N_Compilation_Unit node that is the root of a
|
|
-- subtree containing N.
|
|
|
|
function Enclosing_CPP_Parent (Typ : Entity_Id) return Entity_Id;
|
|
-- Returns the closest ancestor of Typ that is a CPP type.
|
|
|
|
function Enclosing_Declaration (N : Node_Id) return Node_Id;
|
|
-- Returns the declaration node enclosing N (including possibly N itself),
|
|
-- if any, or Empty otherwise.
|
|
|
|
function Enclosing_Generic_Body
|
|
(N : Node_Id) return Node_Id;
|
|
-- Returns the Node_Id associated with the innermost enclosing generic
|
|
-- body, if any. If none, then returns Empty.
|
|
|
|
function Enclosing_Generic_Unit
|
|
(N : Node_Id) return Node_Id;
|
|
-- Returns the Node_Id associated with the innermost enclosing generic
|
|
-- unit, if any. If none, then returns Empty.
|
|
|
|
function Enclosing_Lib_Unit_Entity
|
|
(E : Entity_Id := Current_Scope) return Entity_Id;
|
|
-- Returns the entity of enclosing library unit node which is the root of
|
|
-- the current scope (which must not be Standard_Standard, and the caller
|
|
-- is responsible for ensuring this condition) or other specified entity.
|
|
|
|
function Enclosing_Lib_Unit_Node (N : Node_Id) return Node_Id;
|
|
-- Returns the N_Compilation_Unit node of the library unit that is directly
|
|
-- or indirectly (through a subunit) at the root of a subtree containing
|
|
-- N. This may be either the same as Enclosing_Comp_Unit_Node, or if
|
|
-- Enclosing_Comp_Unit_Node returns a subunit, then the corresponding
|
|
-- library unit. If no such item is found, returns Empty.
|
|
|
|
function Enclosing_Package (E : Entity_Id) return Entity_Id;
|
|
-- Utility function to return the Ada entity of the package enclosing
|
|
-- the entity E, if any. Returns Empty if no enclosing package.
|
|
|
|
function Enclosing_Package_Or_Subprogram (E : Entity_Id) return Entity_Id;
|
|
-- Returns the entity of the package or subprogram enclosing E, if any.
|
|
-- Returns Empty if no enclosing package or subprogram.
|
|
|
|
function Enclosing_Subprogram (E : Entity_Id) return Entity_Id;
|
|
-- Utility function to return the Ada entity of the subprogram enclosing
|
|
-- the entity E, if any. Returns Empty if no enclosing subprogram.
|
|
|
|
procedure Ensure_Freeze_Node (E : Entity_Id);
|
|
-- Make sure a freeze node is allocated for entity E. If necessary, build
|
|
-- and initialize a new freeze node and set Has_Delayed_Freeze True for E.
|
|
|
|
procedure Enter_Name (Def_Id : Entity_Id);
|
|
-- Insert new name in symbol table of current scope with check for
|
|
-- duplications (error message is issued if a conflict is found).
|
|
-- Note: Enter_Name is not used for overloadable entities, instead these
|
|
-- are entered using Sem_Ch6.Enter_Overloadable_Entity.
|
|
|
|
function Entity_Of (N : Node_Id) return Entity_Id;
|
|
-- Return the entity of N or Empty. If N is a renaming, return the entity
|
|
-- of the root renamed object.
|
|
|
|
procedure Explain_Limited_Type (T : Entity_Id; N : Node_Id);
|
|
-- This procedure is called after issuing a message complaining about an
|
|
-- inappropriate use of limited type T. If useful, it adds additional
|
|
-- continuation lines to the message explaining why type T is limited.
|
|
-- Messages are placed at node N.
|
|
|
|
type Extensions_Visible_Mode is
|
|
(Extensions_Visible_None,
|
|
-- Extensions_Visible does not yield a mode when SPARK_Mode is off. This
|
|
-- value acts as a default in a non-SPARK compilation.
|
|
|
|
Extensions_Visible_False,
|
|
-- A value of "False" signifies that Extensions_Visible is either
|
|
-- missing or the pragma is present and the value of its Boolean
|
|
-- expression is False.
|
|
|
|
Extensions_Visible_True);
|
|
-- A value of "True" signifies that Extensions_Visible is present and
|
|
-- the value of its Boolean expression is True.
|
|
|
|
function Extensions_Visible_Status
|
|
(Id : Entity_Id) return Extensions_Visible_Mode;
|
|
-- Given the entity of a subprogram or formal parameter subject to pragma
|
|
-- Extensions_Visible, return the Boolean value denoted by the expression
|
|
-- of the pragma.
|
|
|
|
procedure Find_Actual
|
|
(N : Node_Id;
|
|
Formal : out Entity_Id;
|
|
Call : out Node_Id);
|
|
-- Determines if the node N is an actual parameter of a function or a
|
|
-- procedure call. If so, then Formal points to the entity for the formal
|
|
-- (Ekind is E_In_Parameter, E_Out_Parameter, or E_In_Out_Parameter) and
|
|
-- Call is set to the node for the corresponding call. If the node N is not
|
|
-- an actual parameter then Formal and Call are set to Empty.
|
|
|
|
function Find_Specific_Type (CW : Entity_Id) return Entity_Id;
|
|
-- Find specific type of a class-wide type, and handle the case of an
|
|
-- incomplete type coming either from a limited_with clause or from an
|
|
-- incomplete type declaration. If resulting type is private return its
|
|
-- full view.
|
|
|
|
function Find_Body_Discriminal
|
|
(Spec_Discriminant : Entity_Id) return Entity_Id;
|
|
-- Given a discriminant of the record type that implements a task or
|
|
-- protected type, return the discriminal of the corresponding discriminant
|
|
-- of the actual concurrent type.
|
|
|
|
function Find_Corresponding_Discriminant
|
|
(Id : Node_Id;
|
|
Typ : Entity_Id) return Entity_Id;
|
|
-- Because discriminants may have different names in a generic unit and in
|
|
-- an instance, they are resolved positionally when possible. A reference
|
|
-- to a discriminant carries the discriminant that it denotes when it is
|
|
-- analyzed. Subsequent uses of this id on a different type denotes the
|
|
-- discriminant at the same position in this new type.
|
|
|
|
function Find_Enclosing_Iterator_Loop (Id : Entity_Id) return Entity_Id;
|
|
-- Given an arbitrary entity, try to find the nearest enclosing iterator
|
|
-- loop. If such a loop is found, return the entity of its identifier (the
|
|
-- E_Loop scope), otherwise return Empty.
|
|
|
|
function Find_Loop_In_Conditional_Block (N : Node_Id) return Node_Id;
|
|
-- Find the nested loop statement in a conditional block. Loops subject to
|
|
-- attribute 'Loop_Entry are transformed into blocks. Parts of the original
|
|
-- loop are nested within the block.
|
|
|
|
procedure Find_Overlaid_Entity
|
|
(N : Node_Id;
|
|
Ent : out Entity_Id;
|
|
Off : out Boolean);
|
|
-- The node N should be an address representation clause. Determines if
|
|
-- the target expression is the address of an entity with an optional
|
|
-- offset. If so, set Ent to the entity and, if there is an offset, set
|
|
-- Off to True, otherwise to False. If N is not an address representation
|
|
-- clause, or if it is not possible to determine that the address is of
|
|
-- this form, then set Ent to Empty.
|
|
|
|
function Find_Parameter_Type (Param : Node_Id) return Entity_Id;
|
|
-- Return the type of formal parameter Param as determined by its
|
|
-- specification.
|
|
|
|
-- The following type describes the placement of an arbitrary entity with
|
|
-- respect to SPARK visible / hidden state space.
|
|
|
|
type State_Space_Kind is
|
|
(Not_In_Package,
|
|
-- An entity is not in the visible, private or body state space when
|
|
-- the immediate enclosing construct is not a package.
|
|
|
|
Visible_State_Space,
|
|
-- An entity is in the visible state space when it appears immediately
|
|
-- within the visible declarations of a package or when it appears in
|
|
-- the visible state space of a nested package which in turn is declared
|
|
-- in the visible declarations of an enclosing package:
|
|
|
|
-- package Pack is
|
|
-- Visible_Variable : ...
|
|
-- package Nested
|
|
-- with Abstract_State => Visible_State
|
|
-- is
|
|
-- Visible_Nested_Variable : ...
|
|
-- end Nested;
|
|
-- end Pack;
|
|
|
|
-- Entities associated with a package instantiation inherit the state
|
|
-- space from the instance placement:
|
|
|
|
-- generic
|
|
-- package Gen is
|
|
-- Generic_Variable : ...
|
|
-- end Gen;
|
|
|
|
-- with Gen;
|
|
-- package Pack is
|
|
-- package Inst is new Gen;
|
|
-- -- Generic_Variable is in the visible state space of Pack
|
|
-- end Pack;
|
|
|
|
Private_State_Space,
|
|
-- An entity is in the private state space when it appears immediately
|
|
-- within the private declarations of a package or when it appears in
|
|
-- the visible state space of a nested package which in turn is declared
|
|
-- in the private declarations of an enclosing package:
|
|
|
|
-- package Pack is
|
|
-- private
|
|
-- Private_Variable : ...
|
|
-- package Nested
|
|
-- with Abstract_State => Private_State
|
|
-- is
|
|
-- Private_Nested_Variable : ...
|
|
-- end Nested;
|
|
-- end Pack;
|
|
|
|
-- The same placement principle applies to package instantiations
|
|
|
|
Body_State_Space);
|
|
-- An entity is in the body state space when it appears immediately
|
|
-- within the declarations of a package body or when it appears in the
|
|
-- visible state space of a nested package which in turn is declared in
|
|
-- the declarations of an enclosing package body:
|
|
|
|
-- package body Pack is
|
|
-- Body_Variable : ...
|
|
-- package Nested
|
|
-- with Abstract_State => Body_State
|
|
-- is
|
|
-- Body_Nested_Variable : ...
|
|
-- end Nested;
|
|
-- end Pack;
|
|
|
|
-- The same placement principle applies to package instantiations
|
|
|
|
procedure Find_Placement_In_State_Space
|
|
(Item_Id : Entity_Id;
|
|
Placement : out State_Space_Kind;
|
|
Pack_Id : out Entity_Id);
|
|
-- Determine the state space placement of an item. Item_Id denotes the
|
|
-- entity of an abstract state, object or package instantiation. Placement
|
|
-- captures the precise placement of the item in the enclosing state space.
|
|
-- If the state space is that of a package, Pack_Id denotes its entity,
|
|
-- otherwise Pack_Id is Empty.
|
|
|
|
function Find_Static_Alternative (N : Node_Id) return Node_Id;
|
|
-- N is a case statement whose expression is a compile-time value.
|
|
-- Determine the alternative chosen, so that the code of non-selected
|
|
-- alternatives, and the warnings that may apply to them, are removed.
|
|
|
|
function First_Actual (Node : Node_Id) return Node_Id;
|
|
-- Node is an N_Function_Call, N_Procedure_Call_Statement or
|
|
-- N_Entry_Call_Statement node. The result returned is the first actual
|
|
-- parameter in declaration order (not the order of parameters as they
|
|
-- appeared in the source, which can be quite different as a result of the
|
|
-- use of named parameters). Empty is returned for a call with no
|
|
-- parameters. The procedure for iterating through the actuals in
|
|
-- declaration order is to use this function to find the first actual, and
|
|
-- then use Next_Actual to obtain the next actual in declaration order.
|
|
-- Note that the value returned is always the expression (not the
|
|
-- N_Parameter_Association nodes, even if named association is used).
|
|
|
|
function Fix_Msg (Id : Entity_Id; Msg : String) return String;
|
|
-- Replace all occurrences of a particular word in string Msg depending on
|
|
-- the Ekind of Id as follows:
|
|
-- * Replace "subprogram" with
|
|
-- - "entry" when Id is an entry [family]
|
|
-- - "task type" when Id is a single task object, task type or task
|
|
-- body.
|
|
-- * Replace "protected" with
|
|
-- - "task" when Id is a single task object, task type or task body
|
|
-- All other non-matching words remain as is
|
|
|
|
procedure Gather_Components
|
|
(Typ : Entity_Id;
|
|
Comp_List : Node_Id;
|
|
Governed_By : List_Id;
|
|
Into : Elist_Id;
|
|
Report_Errors : out Boolean);
|
|
-- The purpose of this procedure is to gather the valid components in a
|
|
-- record type according to the values of its discriminants, in order to
|
|
-- validate the components of a record aggregate.
|
|
--
|
|
-- Typ is the type of the aggregate when its constrained discriminants
|
|
-- need to be collected, otherwise it is Empty.
|
|
--
|
|
-- Comp_List is an N_Component_List node.
|
|
--
|
|
-- Governed_By is a list of N_Component_Association nodes, where each
|
|
-- choice list contains the name of a discriminant and the expression
|
|
-- field gives its value. The values of the discriminants governing
|
|
-- the (possibly nested) variant parts in Comp_List are found in this
|
|
-- Component_Association List.
|
|
--
|
|
-- Into is the list where the valid components are appended. Note that
|
|
-- Into need not be an Empty list. If it's not, components are attached
|
|
-- to its tail.
|
|
--
|
|
-- Report_Errors is set to True if the values of the discriminants are
|
|
-- non-static.
|
|
--
|
|
-- This procedure is also used when building a record subtype. If the
|
|
-- discriminant constraint of the subtype is static, the components of the
|
|
-- subtype are only those of the variants selected by the values of the
|
|
-- discriminants. Otherwise all components of the parent must be included
|
|
-- in the subtype for semantic analysis.
|
|
|
|
function Get_Actual_Subtype (N : Node_Id) return Entity_Id;
|
|
-- Given a node for an expression, obtain the actual subtype of the
|
|
-- expression. In the case of a parameter where the formal is an
|
|
-- unconstrained array or discriminated type, this will be the previously
|
|
-- constructed subtype of the actual. Note that this is not quite the
|
|
-- "Actual Subtype" of the RM, since it is always a constrained type, i.e.
|
|
-- it is the subtype of the value of the actual. The actual subtype is also
|
|
-- returned in other cases where it has already been constructed for an
|
|
-- object. Otherwise the expression type is returned unchanged, except for
|
|
-- the case of an unconstrained array type, where an actual subtype is
|
|
-- created, using Insert_Actions if necessary to insert any associated
|
|
-- actions.
|
|
|
|
function Get_Actual_Subtype_If_Available (N : Node_Id) return Entity_Id;
|
|
-- This is like Get_Actual_Subtype, except that it never constructs an
|
|
-- actual subtype. If an actual subtype is already available, i.e. the
|
|
-- Actual_Subtype field of the corresponding entity is set, then it is
|
|
-- returned. Otherwise the Etype of the node is returned.
|
|
|
|
function Get_Body_From_Stub (N : Node_Id) return Node_Id;
|
|
-- Return the body node for a stub
|
|
|
|
function Get_Cursor_Type
|
|
(Aspect : Node_Id;
|
|
Typ : Entity_Id) return Entity_Id;
|
|
-- Find Cursor type in scope of type Typ with Iterable aspect, by locating
|
|
-- primitive operation First. For use in resolving the other primitive
|
|
-- operations of an Iterable type and expanding loops and quantified
|
|
-- expressions over formal containers.
|
|
|
|
function Get_Cursor_Type (Typ : Entity_Id) return Entity_Id;
|
|
-- Find Cursor type in scope of type Typ with Iterable aspect, by locating
|
|
-- primitive operation First. For use after resolving the primitive
|
|
-- operations of an Iterable type.
|
|
|
|
function Get_Default_External_Name (E : Node_Or_Entity_Id) return Node_Id;
|
|
-- This is used to construct the string literal node representing a
|
|
-- default external name, i.e. one that is constructed from the name of an
|
|
-- entity, or (in the case of extended DEC import/export pragmas, an
|
|
-- identifier provided as the external name. Letters in the name are
|
|
-- according to the setting of Opt.External_Name_Default_Casing.
|
|
|
|
function Get_Enclosing_Object (N : Node_Id) return Entity_Id;
|
|
-- If expression N references a part of an object, return this object.
|
|
-- Otherwise return Empty. Expression N should have been resolved already.
|
|
|
|
function Get_Generic_Entity (N : Node_Id) return Entity_Id;
|
|
-- Returns the true generic entity in an instantiation. If the name in the
|
|
-- instantiation is a renaming, the function returns the renamed generic.
|
|
|
|
function Get_Incomplete_View_Of_Ancestor (E : Entity_Id) return Entity_Id;
|
|
-- Implements the notion introduced ever-so briefly in RM 7.3.1 (5.2/3):
|
|
-- in a child unit a derived type is within the derivation class of an
|
|
-- ancestor declared in a parent unit, even if there is an intermediate
|
|
-- derivation that does not see the full view of that ancestor.
|
|
|
|
procedure Get_Index_Bounds (N : Node_Id; L, H : out Node_Id);
|
|
-- This procedure assigns to L and H respectively the values of the low and
|
|
-- high bounds of node N, which must be a range, subtype indication, or the
|
|
-- name of a scalar subtype. The result in L, H may be set to Error if
|
|
-- there was an earlier error in the range.
|
|
|
|
function Get_Enum_Lit_From_Pos
|
|
(T : Entity_Id;
|
|
Pos : Uint;
|
|
Loc : Source_Ptr) return Node_Id;
|
|
-- This function returns an identifier denoting the E_Enumeration_Literal
|
|
-- entity for the specified value from the enumeration type or subtype T.
|
|
-- The second argument is the Pos value, which is assumed to be in range.
|
|
-- The third argument supplies a source location for constructed nodes
|
|
-- returned by this function.
|
|
|
|
function Get_Iterable_Type_Primitive
|
|
(Typ : Entity_Id;
|
|
Nam : Name_Id) return Entity_Id;
|
|
-- Retrieve one of the primitives First, Next, Has_Element, Element from
|
|
-- the value of the Iterable aspect of a formal type.
|
|
|
|
procedure Get_Library_Unit_Name_String (Decl_Node : Node_Id);
|
|
-- Retrieve the fully expanded name of the library unit declared by
|
|
-- Decl_Node into the name buffer.
|
|
|
|
function Get_Name_Entity_Id (Id : Name_Id) return Entity_Id;
|
|
pragma Inline (Get_Name_Entity_Id);
|
|
-- An entity value is associated with each name in the name table. The
|
|
-- Get_Name_Entity_Id function fetches the Entity_Id of this entity, which
|
|
-- is the innermost visible entity with the given name. See the body of
|
|
-- Sem_Ch8 for further details on handling of entity visibility.
|
|
|
|
function Get_Name_From_CTC_Pragma (N : Node_Id) return String_Id;
|
|
-- Return the Name component of Test_Case pragma N
|
|
-- Bad name now that this no longer applies to Contract_Case ???
|
|
|
|
function Get_Parent_Entity (Unit : Node_Id) return Entity_Id;
|
|
-- Get defining entity of parent unit of a child unit. In most cases this
|
|
-- is the defining entity of the unit, but for a child instance whose
|
|
-- parent needs a body for inlining, the instantiation node of the parent
|
|
-- has not yet been rewritten as a package declaration, and the entity has
|
|
-- to be retrieved from the Instance_Spec of the unit.
|
|
|
|
function Get_Pragma_Id (N : Node_Id) return Pragma_Id;
|
|
pragma Inline (Get_Pragma_Id);
|
|
-- Obtains the Pragma_Id from the Chars field of Pragma_Identifier (N)
|
|
|
|
function Get_Qualified_Name
|
|
(Id : Entity_Id;
|
|
Suffix : Entity_Id := Empty) return Name_Id;
|
|
-- Obtain the fully qualified form of entity Id. The format is:
|
|
-- scope_of_id-1__scope_of_id__chars_of_id__chars_of_suffix
|
|
|
|
function Get_Qualified_Name
|
|
(Nam : Name_Id;
|
|
Suffix : Name_Id := No_Name;
|
|
Scop : Entity_Id := Current_Scope) return Name_Id;
|
|
-- Obtain the fully qualified form of name Nam assuming it appears in scope
|
|
-- Scop. The format is:
|
|
-- scop-1__scop__nam__suffix
|
|
|
|
procedure Get_Reason_String (N : Node_Id);
|
|
-- Recursive routine to analyze reason argument for pragma Warnings. The
|
|
-- value of the reason argument is appended to the current string using
|
|
-- Store_String_Chars. The reason argument is expected to be a string
|
|
-- literal or concatenation of string literals. An error is given for
|
|
-- any other form.
|
|
|
|
function Get_Reference_Discriminant (Typ : Entity_Id) return Entity_Id;
|
|
-- If Typ has Implicit_Dereference, return discriminant specified in the
|
|
-- corresponding aspect.
|
|
|
|
function Get_Referenced_Object (N : Node_Id) return Node_Id;
|
|
-- Given a node, return the renamed object if the node represents a renamed
|
|
-- object, otherwise return the node unchanged. The node may represent an
|
|
-- arbitrary expression.
|
|
|
|
function Get_Renamed_Entity (E : Entity_Id) return Entity_Id;
|
|
-- Given an entity for an exception, package, subprogram or generic unit,
|
|
-- returns the ultimately renamed entity if this is a renaming. If this is
|
|
-- not a renamed entity, returns its argument. It is an error to call this
|
|
-- with any other kind of entity.
|
|
|
|
function Get_Return_Object (N : Node_Id) return Entity_Id;
|
|
-- Given an extended return statement, return the corresponding return
|
|
-- object, identified as the one for which Is_Return_Object = True.
|
|
|
|
function Get_Subprogram_Entity (Nod : Node_Id) return Entity_Id;
|
|
-- Nod is either a procedure call statement, or a function call, or an
|
|
-- accept statement node. This procedure finds the Entity_Id of the related
|
|
-- subprogram or entry and returns it, or if no subprogram can be found,
|
|
-- returns Empty.
|
|
|
|
function Get_Task_Body_Procedure (E : Entity_Id) return Node_Id;
|
|
pragma Inline (Get_Task_Body_Procedure);
|
|
-- Given an entity for a task type or subtype, retrieves the
|
|
-- Task_Body_Procedure field from the corresponding task type declaration.
|
|
|
|
function Get_User_Defined_Eq (E : Entity_Id) return Entity_Id;
|
|
-- For a type entity, return the entity of the primitive equality function
|
|
-- for the type if it exists, otherwise return Empty.
|
|
|
|
procedure Get_Views
|
|
(Typ : Entity_Id;
|
|
Priv_Typ : out Entity_Id;
|
|
Full_Typ : out Entity_Id;
|
|
Full_Base : out Entity_Id;
|
|
CRec_Typ : out Entity_Id);
|
|
-- Obtain the partial and full view of type Typ and in addition any extra
|
|
-- types the full view may have. The return entities are as follows:
|
|
--
|
|
-- Priv_Typ - the partial view (a private type)
|
|
-- Full_Typ - the full view
|
|
-- Full_Base - the base type of the full view
|
|
-- CRec_Typ - the corresponding record type of the full view
|
|
|
|
function Has_Access_Values (T : Entity_Id) return Boolean;
|
|
-- Returns true if type or subtype T is an access type, or has a component
|
|
-- (at any recursive level) that is an access type. This is a conservative
|
|
-- predicate, if it is not known whether or not T contains access values
|
|
-- (happens for generic formals in some cases), then False is returned.
|
|
-- Note that tagged types return False. Even though the tag is implemented
|
|
-- as an access type internally, this function tests only for access types
|
|
-- known to the programmer. See also Has_Tagged_Component.
|
|
|
|
type Alignment_Result is (Known_Compatible, Unknown, Known_Incompatible);
|
|
-- Result of Has_Compatible_Alignment test, description found below. Note
|
|
-- that the values are arranged in increasing order of problematicness.
|
|
|
|
function Has_Compatible_Alignment
|
|
(Obj : Entity_Id;
|
|
Expr : Node_Id;
|
|
Layout_Done : Boolean) return Alignment_Result;
|
|
-- Obj is an object entity, and expr is a node for an object reference. If
|
|
-- the alignment of the object referenced by Expr is known to be compatible
|
|
-- with the alignment of Obj (i.e. is larger or the same), then the result
|
|
-- is Known_Compatible. If the alignment of the object referenced by Expr
|
|
-- is known to be less than the alignment of Obj, then Known_Incompatible
|
|
-- is returned. If neither condition can be reliably established at compile
|
|
-- time, then Unknown is returned. If Layout_Done is True, the function can
|
|
-- assume that the information on size and alignment of types and objects
|
|
-- is present in the tree. This is used to determine if alignment checks
|
|
-- are required for address clauses (Layout_Done is False in this case) as
|
|
-- well as to issue appropriate warnings for them in the post compilation
|
|
-- phase (Layout_Done is True in this case).
|
|
--
|
|
-- Note: Known_Incompatible does not mean that at run time the alignment
|
|
-- of Expr is known to be wrong for Obj, just that it can be determined
|
|
-- that alignments have been explicitly or implicitly specified which are
|
|
-- incompatible (whereas Unknown means that even this is not known). The
|
|
-- appropriate reaction of a caller to Known_Incompatible is to treat it as
|
|
-- Unknown, but issue a warning that there may be an alignment error.
|
|
|
|
function Has_Declarations (N : Node_Id) return Boolean;
|
|
-- Determines if the node can have declarations
|
|
|
|
function Has_Defaulted_Discriminants (Typ : Entity_Id) return Boolean;
|
|
-- Simple predicate to test for defaulted discriminants
|
|
|
|
function Has_Denormals (E : Entity_Id) return Boolean;
|
|
-- Determines if the floating-point type E supports denormal numbers.
|
|
-- Returns False if E is not a floating-point type.
|
|
|
|
function Has_Discriminant_Dependent_Constraint
|
|
(Comp : Entity_Id) return Boolean;
|
|
-- Returns True if and only if Comp has a constrained subtype that depends
|
|
-- on a discriminant.
|
|
|
|
function Has_Effectively_Volatile_Profile
|
|
(Subp_Id : Entity_Id) return Boolean;
|
|
-- Determine whether subprogram Subp_Id has an effectively volatile formal
|
|
-- parameter or returns an effectively volatile value.
|
|
|
|
function Has_Full_Default_Initialization (Typ : Entity_Id) return Boolean;
|
|
-- Determine whether type Typ defines "full default initialization" as
|
|
-- specified by SPARK RM 3.1. To qualify as such, the type must be
|
|
-- * A scalar type with specified Default_Value
|
|
-- * An array-of-scalar type with specified Default_Component_Value
|
|
-- * An array type whose element type defines full default initialization
|
|
-- * A protected type, record type or type extension whose components
|
|
-- either include a default expression or have a type which defines
|
|
-- full default initialization. In the case of type extensions, the
|
|
-- parent type defines full default initialization.
|
|
-- * A task type
|
|
-- * A private type whose Default_Initial_Condition is non-null
|
|
|
|
function Has_Infinities (E : Entity_Id) return Boolean;
|
|
-- Determines if the range of the floating-point type E includes
|
|
-- infinities. Returns False if E is not a floating-point type.
|
|
|
|
function Has_Interfaces
|
|
(T : Entity_Id;
|
|
Use_Full_View : Boolean := True) return Boolean;
|
|
-- Where T is a concurrent type or a record type, returns true if T covers
|
|
-- any abstract interface types. In case of private types the argument
|
|
-- Use_Full_View controls if the check is done using its full view (if
|
|
-- available).
|
|
|
|
function Has_No_Obvious_Side_Effects (N : Node_Id) return Boolean;
|
|
-- This is a simple minded function for determining whether an expression
|
|
-- has no obvious side effects. It is used only for determining whether
|
|
-- warnings are needed in certain situations, and is not guaranteed to
|
|
-- be accurate in either direction. Exceptions may mean an expression
|
|
-- does in fact have side effects, but this may be ignored and True is
|
|
-- returned, or a complex expression may in fact be side effect free
|
|
-- but we don't recognize it here and return False. The Side_Effect_Free
|
|
-- routine in Remove_Side_Effects is much more extensive and perhaps could
|
|
-- be shared, so that this routine would be more accurate.
|
|
|
|
function Has_Non_Null_Refinement (Id : Entity_Id) return Boolean;
|
|
-- Determine whether abstract state Id has at least one nonnull constituent
|
|
-- as expressed in pragma Refined_State. This function does not take into
|
|
-- account the visible refinement region of abstract state Id.
|
|
|
|
function Has_Null_Body (Proc_Id : Entity_Id) return Boolean;
|
|
-- Determine whether the body of procedure Proc_Id contains a sole
|
|
-- null statement, possibly followed by an optional return. Used to
|
|
-- optimize useless calls to assertion checks.
|
|
|
|
function Has_Null_Exclusion (N : Node_Id) return Boolean;
|
|
-- Determine whether node N has a null exclusion
|
|
|
|
function Has_Null_Refinement (Id : Entity_Id) return Boolean;
|
|
-- Determine whether abstract state Id has a null refinement as expressed
|
|
-- in pragma Refined_State. This function does not take into account the
|
|
-- visible refinement region of abstract state Id.
|
|
|
|
function Has_Overriding_Initialize (T : Entity_Id) return Boolean;
|
|
-- Predicate to determine whether a controlled type has a user-defined
|
|
-- Initialize primitive (and, in Ada 2012, whether that primitive is
|
|
-- non-null), which causes the type to not have preelaborable
|
|
-- initialization.
|
|
|
|
function Has_Preelaborable_Initialization (E : Entity_Id) return Boolean;
|
|
-- Return True iff type E has preelaborable initialization as defined in
|
|
-- Ada 2005 (see AI-161 for details of the definition of this attribute).
|
|
|
|
function Has_Private_Component (Type_Id : Entity_Id) return Boolean;
|
|
-- Check if a type has a (sub)component of a private type that has not
|
|
-- yet received a full declaration.
|
|
|
|
function Has_Signed_Zeros (E : Entity_Id) return Boolean;
|
|
-- Determines if the floating-point type E supports signed zeros.
|
|
-- Returns False if E is not a floating-point type.
|
|
|
|
function Has_Significant_Contract (Subp_Id : Entity_Id) return Boolean;
|
|
-- Determine whether subprogram [body] Subp_Id has a significant contract.
|
|
-- All subprograms have a N_Contract node, but this does not mean that the
|
|
-- contract is useful.
|
|
|
|
function Has_Static_Array_Bounds (Typ : Node_Id) return Boolean;
|
|
-- Return whether an array type has static bounds
|
|
|
|
function Has_Stream (T : Entity_Id) return Boolean;
|
|
-- Tests if type T is derived from Ada.Streams.Root_Stream_Type, or in the
|
|
-- case of a composite type, has a component for which this predicate is
|
|
-- True, and if so returns True. Otherwise a result of False means that
|
|
-- there is no Stream type in sight. For a private type, the test is
|
|
-- applied to the underlying type (or returns False if there is no
|
|
-- underlying type).
|
|
|
|
function Has_Suffix (E : Entity_Id; Suffix : Character) return Boolean;
|
|
-- Returns true if the last character of E is Suffix. Used in Assertions.
|
|
|
|
function Has_Tagged_Component (Typ : Entity_Id) return Boolean;
|
|
-- Returns True if Typ is a composite type (array or record) which is
|
|
-- either itself a tagged type, or has a component (recursively) which is
|
|
-- a tagged type. Returns False for non-composite type, or if no tagged
|
|
-- component is present. This function is used to check if "=" has to be
|
|
-- expanded into a bunch component comparisons.
|
|
|
|
function Has_Undefined_Reference (Expr : Node_Id) return Boolean;
|
|
-- Given arbitrary expression Expr, determine whether it contains at
|
|
-- least one name whose entity is Any_Id.
|
|
|
|
function Has_Volatile_Component (Typ : Entity_Id) return Boolean;
|
|
-- Given arbitrary type Typ, determine whether it contains at least one
|
|
-- volatile component.
|
|
|
|
function Implementation_Kind (Subp : Entity_Id) return Name_Id;
|
|
-- Subp is a subprogram marked with pragma Implemented. Return the specific
|
|
-- implementation requirement which the pragma imposes. The return value is
|
|
-- either Name_By_Any, Name_By_Entry or Name_By_Protected_Procedure.
|
|
|
|
function Implements_Interface
|
|
(Typ_Ent : Entity_Id;
|
|
Iface_Ent : Entity_Id;
|
|
Exclude_Parents : Boolean := False) return Boolean;
|
|
-- Returns true if the Typ_Ent implements interface Iface_Ent
|
|
|
|
function In_Assertion_Expression_Pragma (N : Node_Id) return Boolean;
|
|
-- Returns True if node N appears within a pragma that acts as an assertion
|
|
-- expression. See Sem_Prag for the list of qualifying pragmas.
|
|
|
|
function In_Instance return Boolean;
|
|
-- Returns True if the current scope is within a generic instance
|
|
|
|
function In_Instance_Body return Boolean;
|
|
-- Returns True if current scope is within the body of an instance, where
|
|
-- several semantic checks (e.g. accessibility checks) are relaxed.
|
|
|
|
function In_Instance_Not_Visible return Boolean;
|
|
-- Returns True if current scope is with the private part or the body of
|
|
-- an instance. Other semantic checks are suppressed in this context.
|
|
|
|
function In_Instance_Visible_Part return Boolean;
|
|
-- Returns True if current scope is within the visible part of a package
|
|
-- instance, where several additional semantic checks apply.
|
|
|
|
function In_Package_Body return Boolean;
|
|
-- Returns True if current scope is within a package body
|
|
|
|
function In_Parameter_Specification (N : Node_Id) return Boolean;
|
|
-- Returns True if node N belongs to a parameter specification
|
|
|
|
function In_Pragma_Expression (N : Node_Id; Nam : Name_Id) return Boolean;
|
|
-- Returns true if the expression N occurs within a pragma with name Nam
|
|
|
|
function In_Pre_Post_Condition (N : Node_Id) return Boolean;
|
|
-- Returns True if node N appears within a pre/postcondition pragma. Note
|
|
-- the pragma Check equivalents are NOT considered.
|
|
|
|
function In_Reverse_Storage_Order_Object (N : Node_Id) return Boolean;
|
|
-- Returns True if N denotes a component or subcomponent in a record or
|
|
-- array that has Reverse_Storage_Order.
|
|
|
|
function In_Subprogram_Or_Concurrent_Unit return Boolean;
|
|
-- Determines if the current scope is within a subprogram compilation unit
|
|
-- (inside a subprogram declaration, subprogram body, or generic subprogram
|
|
-- declaration) or within a task or protected body. The test is for
|
|
-- appearing anywhere within such a construct (that is it does not need
|
|
-- to be directly within).
|
|
|
|
function In_Visible_Part (Scope_Id : Entity_Id) return Boolean;
|
|
-- Determine whether a declaration occurs within the visible part of a
|
|
-- package specification. The package must be on the scope stack, and the
|
|
-- corresponding private part must not.
|
|
|
|
function Incomplete_Or_Partial_View (Id : Entity_Id) return Entity_Id;
|
|
-- Given the entity of a constant or a type, retrieve the incomplete or
|
|
-- partial view of the same entity. Note that Id may not have a partial
|
|
-- view in which case the function returns Empty.
|
|
|
|
function Indexed_Component_Bit_Offset (N : Node_Id) return Uint;
|
|
-- Given an N_Indexed_Component node, return the first bit position of the
|
|
-- component if it is known at compile time. A value of No_Uint means that
|
|
-- either the value is not yet known before back-end processing or it is
|
|
-- not known at compile time after back-end processing.
|
|
|
|
procedure Inherit_Default_Init_Cond_Procedure (Typ : Entity_Id);
|
|
-- Inherit the default initial condition procedure from the parent type of
|
|
-- derived type Typ.
|
|
|
|
procedure Inherit_Rep_Item_Chain (Typ : Entity_Id; From_Typ : Entity_Id);
|
|
-- Inherit the rep item chain of type From_Typ without clobbering any
|
|
-- existing rep items on Typ's chain. Typ is the destination type.
|
|
|
|
procedure Insert_Explicit_Dereference (N : Node_Id);
|
|
-- In a context that requires a composite or subprogram type and where a
|
|
-- prefix is an access type, rewrite the access type node N (which is the
|
|
-- prefix, e.g. of an indexed component) as an explicit dereference.
|
|
|
|
procedure Inspect_Deferred_Constant_Completion (Decls : List_Id);
|
|
-- Examine all deferred constants in the declaration list Decls and check
|
|
-- whether they have been completed by a full constant declaration or an
|
|
-- Import pragma. Emit the error message if that is not the case.
|
|
|
|
procedure Install_Generic_Formals (Subp_Id : Entity_Id);
|
|
-- Install both the generic formal parameters and the formal parameters of
|
|
-- generic subprogram Subp_Id into visibility.
|
|
|
|
function Is_Actual_Out_Parameter (N : Node_Id) return Boolean;
|
|
-- Determines if N is an actual parameter of out mode in a subprogram call
|
|
|
|
function Is_Actual_Parameter (N : Node_Id) return Boolean;
|
|
-- Determines if N is an actual parameter in a subprogram call
|
|
|
|
function Is_Actual_Tagged_Parameter (N : Node_Id) return Boolean;
|
|
-- Determines if N is an actual parameter of a formal of tagged type in a
|
|
-- subprogram call.
|
|
|
|
function Is_Aliased_View (Obj : Node_Id) return Boolean;
|
|
-- Determine if Obj is an aliased view, i.e. the name of an object to which
|
|
-- 'Access or 'Unchecked_Access can apply. Note that this routine uses the
|
|
-- rules of the language, it does not take into account the restriction
|
|
-- No_Implicit_Aliasing, so it can return True if the restriction is active
|
|
-- and Obj violates the restriction. The caller is responsible for calling
|
|
-- Restrict.Check_No_Implicit_Aliasing if True is returned, but there is a
|
|
-- requirement for obeying the restriction in the call context.
|
|
|
|
function Is_Ancestor_Package
|
|
(E1 : Entity_Id;
|
|
E2 : Entity_Id) return Boolean;
|
|
-- Determine whether package E1 is an ancestor of E2
|
|
|
|
function Is_Atomic_Object (N : Node_Id) return Boolean;
|
|
-- Determines if the given node denotes an atomic object in the sense of
|
|
-- the legality checks described in RM C.6(12).
|
|
|
|
function Is_Atomic_Or_VFA_Object (N : Node_Id) return Boolean;
|
|
-- Determines if the given node is an atomic object (Is_Atomic_Object true)
|
|
-- or else is an object for which VFA is present.
|
|
|
|
function Is_Attribute_Result (N : Node_Id) return Boolean;
|
|
-- Determine whether node N denotes attribute 'Result
|
|
|
|
function Is_Attribute_Update (N : Node_Id) return Boolean;
|
|
-- Determine whether node N denotes attribute 'Update
|
|
|
|
function Is_Body_Or_Package_Declaration (N : Node_Id) return Boolean;
|
|
-- Determine whether node N denotes a body or a package declaration
|
|
|
|
function Is_Bounded_String (T : Entity_Id) return Boolean;
|
|
-- True if T is a bounded string type. Used to make sure "=" composes
|
|
-- properly for bounded string types.
|
|
|
|
function Is_Constant_Bound (Exp : Node_Id) return Boolean;
|
|
-- Exp is the expression for an array bound. Determines whether the
|
|
-- bound is a compile-time known value, or a constant entity, or an
|
|
-- enumeration literal, or an expression composed of constant-bound
|
|
-- subexpressions which are evaluated by means of standard operators.
|
|
|
|
function Is_Container_Element (Exp : Node_Id) return Boolean;
|
|
-- This routine recognizes expressions that denote an element of one of
|
|
-- the predefined containers, when the source only contains an indexing
|
|
-- operation and an implicit dereference is inserted by the compiler.
|
|
-- In the absence of this optimization, the indexing creates a temporary
|
|
-- controlled cursor that sets the tampering bit of the container, and
|
|
-- restricts the use of the convenient notation C (X) to contexts that
|
|
-- do not check the tampering bit (e.g. C.Include (X, C (Y)). Exp is an
|
|
-- explicit dereference. The transformation applies when it has the form
|
|
-- F (X).Discr.all.
|
|
|
|
function Is_Contract_Annotation (Item : Node_Id) return Boolean;
|
|
-- Determine whether aspect specification or pragma Item is a contract
|
|
-- annotation.
|
|
|
|
function Is_Controlling_Limited_Procedure
|
|
(Proc_Nam : Entity_Id) return Boolean;
|
|
-- Ada 2005 (AI-345): Determine whether Proc_Nam is a primitive procedure
|
|
-- of a limited interface with a controlling first parameter.
|
|
|
|
function Is_CPP_Constructor_Call (N : Node_Id) return Boolean;
|
|
-- Returns True if N is a call to a CPP constructor
|
|
|
|
function Is_Child_Or_Sibling
|
|
(Pack_1 : Entity_Id;
|
|
Pack_2 : Entity_Id) return Boolean;
|
|
-- Determine the following relations between two arbitrary packages:
|
|
-- 1) One package is the parent of a child package
|
|
-- 2) Both packages are siblings and share a common parent
|
|
|
|
function Is_Concurrent_Interface (T : Entity_Id) return Boolean;
|
|
-- First determine whether type T is an interface and then check whether
|
|
-- it is of protected, synchronized or task kind.
|
|
|
|
function Is_Current_Instance (N : Node_Id) return Boolean;
|
|
-- Predicate is true if N legally denotes a type name within its own
|
|
-- declaration. Prior to Ada 2012 this covered only synchronized type
|
|
-- declarations. In Ada 2012 it also covers type and subtype declarations
|
|
-- with aspects: Invariant, Predicate, and Default_Initial_Condition.
|
|
|
|
function Is_Declaration (N : Node_Id) return Boolean;
|
|
-- Determine whether arbitrary node N denotes a declaration
|
|
|
|
function Is_Declared_Within_Variant (Comp : Entity_Id) return Boolean;
|
|
-- Returns True iff component Comp is declared within a variant part
|
|
|
|
function Is_Dependent_Component_Of_Mutable_Object
|
|
(Object : Node_Id) return Boolean;
|
|
-- Returns True if Object is the name of a subcomponent that depends on
|
|
-- discriminants of a variable whose nominal subtype is unconstrained and
|
|
-- not indefinite, and the variable is not aliased. Otherwise returns
|
|
-- False. The nodes passed to this function are assumed to denote objects.
|
|
|
|
function Is_Dereferenced (N : Node_Id) return Boolean;
|
|
-- N is a subexpression node of an access type. This function returns true
|
|
-- if N appears as the prefix of a node that does a dereference of the
|
|
-- access value (selected/indexed component, explicit dereference or a
|
|
-- slice), and false otherwise.
|
|
|
|
function Is_Descendant_Of (T1 : Entity_Id; T2 : Entity_Id) return Boolean;
|
|
-- Returns True if type T1 is a descendant of type T2, and false otherwise.
|
|
-- This is the RM definition, a type is a descendant of another type if it
|
|
-- is the same type or is derived from a descendant of the other type.
|
|
|
|
function Is_Descendant_Of_Suspension_Object
|
|
(Typ : Entity_Id) return Boolean;
|
|
-- Determine whether type Typ is a descendant of type Suspension_Object
|
|
-- defined in Ada.Synchronous_Task_Control. This version is different from
|
|
-- Is_Descendant_Of as the detection of Suspension_Object does not involve
|
|
-- an entity and by extension a call to RTSfind.
|
|
|
|
function Is_Double_Precision_Floating_Point_Type
|
|
(E : Entity_Id) return Boolean;
|
|
-- Return whether E is a double precision floating point type,
|
|
-- characterized by:
|
|
-- . machine_radix = 2
|
|
-- . machine_mantissa = 53
|
|
-- . machine_emax = 2**10
|
|
-- . machine_emin = 3 - machine_emax
|
|
|
|
function Is_Effectively_Volatile (Id : Entity_Id) return Boolean;
|
|
-- Determine whether a type or object denoted by entity Id is effectively
|
|
-- volatile (SPARK RM 7.1.2). To qualify as such, the entity must be either
|
|
-- * Volatile
|
|
-- * An array type subject to aspect Volatile_Components
|
|
-- * An array type whose component type is effectively volatile
|
|
-- * A protected type
|
|
-- * Descendant of type Ada.Synchronous_Task_Control.Suspension_Object
|
|
|
|
function Is_Effectively_Volatile_Object (N : Node_Id) return Boolean;
|
|
-- Determine whether an arbitrary node denotes an effectively volatile
|
|
-- object (SPARK RM 7.1.2).
|
|
|
|
function Is_Entry_Body (Id : Entity_Id) return Boolean;
|
|
-- Determine whether entity Id is the body entity of an entry [family]
|
|
|
|
function Is_Entry_Declaration (Id : Entity_Id) return Boolean;
|
|
-- Determine whether entity Id is the spec entity of an entry [family]
|
|
|
|
function Is_Expanded_Priority_Attribute (E : Entity_Id) return Boolean;
|
|
-- Check whether a function in a call is an expanded priority attribute,
|
|
-- which is transformed into an Rtsfind call to Get_Ceiling. This expansion
|
|
-- does not take place in a configurable runtime.
|
|
|
|
function Is_Expression_Function (Subp : Entity_Id) return Boolean;
|
|
-- Determine whether subprogram [body] Subp denotes an expression function
|
|
|
|
function Is_Expression_Function_Or_Completion
|
|
(Subp : Entity_Id) return Boolean;
|
|
-- Determine whether subprogram [body] Subp denotes an expression function
|
|
-- or is completed by an expression function body.
|
|
|
|
function Is_EVF_Expression (N : Node_Id) return Boolean;
|
|
-- Determine whether node N denotes a reference to a formal parameter of
|
|
-- a specific tagged type whose related subprogram is subject to pragma
|
|
-- Extensions_Visible with value "False" (SPARK RM 6.1.7). Several other
|
|
-- constructs fall under this category:
|
|
-- 1) A qualified expression whose operand is EVF
|
|
-- 2) A type conversion whose operand is EVF
|
|
-- 3) An if expression with at least one EVF dependent_expression
|
|
-- 4) A case expression with at least one EVF dependent_expression
|
|
|
|
function Is_False (U : Uint) return Boolean;
|
|
pragma Inline (Is_False);
|
|
-- The argument is a Uint value which is the Boolean'Pos value of a Boolean
|
|
-- operand (i.e. is either 0 for False, or 1 for True). This function tests
|
|
-- if it is False (i.e. zero).
|
|
|
|
function Is_Fixed_Model_Number (U : Ureal; T : Entity_Id) return Boolean;
|
|
-- Returns True iff the number U is a model number of the fixed-point type
|
|
-- T, i.e. if it is an exact multiple of Small.
|
|
|
|
function Is_Fully_Initialized_Type (Typ : Entity_Id) return Boolean;
|
|
-- Typ is a type entity. This function returns true if this type is fully
|
|
-- initialized, meaning that an object of the type is fully initialized.
|
|
-- Note that initialization resulting from use of pragma Normalize_Scalars
|
|
-- does not count. Note that this is only used for the purpose of issuing
|
|
-- warnings for objects that are potentially referenced uninitialized. This
|
|
-- means that the result returned is not crucial, but should err on the
|
|
-- side of thinking things are fully initialized if it does not know.
|
|
|
|
function Is_Generic_Declaration_Or_Body (Decl : Node_Id) return Boolean;
|
|
-- Determine whether arbitrary declaration Decl denotes a generic package,
|
|
-- a generic subprogram or a generic body.
|
|
|
|
function Is_Inherited_Operation (E : Entity_Id) return Boolean;
|
|
-- E is a subprogram. Return True is E is an implicit operation inherited
|
|
-- by a derived type declaration.
|
|
|
|
function Is_Inherited_Operation_For_Type
|
|
(E : Entity_Id;
|
|
Typ : Entity_Id) return Boolean;
|
|
-- E is a subprogram. Return True is E is an implicit operation inherited
|
|
-- by the derived type declaration for type Typ.
|
|
|
|
function Is_Iterator (Typ : Entity_Id) return Boolean;
|
|
-- AI05-0139-2: Check whether Typ is one of the predefined interfaces in
|
|
-- Ada.Iterator_Interfaces, or it is derived from one.
|
|
|
|
function Is_Iterator_Over_Array (N : Node_Id) return Boolean;
|
|
-- N is an iterator specification. Returns True iff N is an iterator over
|
|
-- an array, either inside a loop of the form 'for X of A' or a quantified
|
|
-- expression of the form 'for all/some X of A' where A is of array type.
|
|
|
|
type Is_LHS_Result is (Yes, No, Unknown);
|
|
function Is_LHS (N : Node_Id) return Is_LHS_Result;
|
|
-- Returns Yes if N is definitely used as Name in an assignment statement.
|
|
-- Returns No if N is definitely NOT used as a Name in an assignment
|
|
-- statement. Returns Unknown if we can't tell at this stage (happens in
|
|
-- the case where we don't know the type of N yet, and we have something
|
|
-- like N.A := 3, where this counts as N being used on the left side of
|
|
-- an assignment only if N is not an access type. If it is an access type
|
|
-- then it is N.all.A that is assigned, not N.
|
|
|
|
function Is_Library_Level_Entity (E : Entity_Id) return Boolean;
|
|
-- A library-level declaration is one that is accessible from Standard,
|
|
-- i.e. a library unit or an entity declared in a library package.
|
|
|
|
function Is_Limited_Class_Wide_Type (Typ : Entity_Id) return Boolean;
|
|
-- Determine whether a given type is a limited class-wide type, in which
|
|
-- case it needs a Master_Id, because extensions of its designated type
|
|
-- may include task components. A class-wide type that comes from a
|
|
-- limited view must be treated in the same way.
|
|
|
|
function Is_Local_Variable_Reference (Expr : Node_Id) return Boolean;
|
|
-- Determines whether Expr is a reference to a variable or IN OUT mode
|
|
-- parameter of the current enclosing subprogram.
|
|
-- Why are OUT parameters not considered here ???
|
|
|
|
function Is_Nontrivial_Default_Init_Cond_Procedure
|
|
(Id : Entity_Id) return Boolean;
|
|
-- Determine whether entity Id denotes the procedure that verifies the
|
|
-- assertion expression of pragma Default_Initial_Condition and if it does,
|
|
-- the encapsulated expression is nontrivial.
|
|
|
|
function Is_Null_Record_Type (T : Entity_Id) return Boolean;
|
|
-- Determine whether T is declared with a null record definition or a
|
|
-- null component list.
|
|
|
|
function Is_Object_Reference (N : Node_Id) return Boolean;
|
|
-- Determines if the tree referenced by N represents an object. Both
|
|
-- variable and constant objects return True (compare Is_Variable).
|
|
|
|
function Is_OK_Variable_For_Out_Formal (AV : Node_Id) return Boolean;
|
|
-- Used to test if AV is an acceptable formal for an OUT or IN OUT formal.
|
|
-- Note that the Is_Variable function is not quite the right test because
|
|
-- this is a case in which conversions whose expression is a variable (in
|
|
-- the Is_Variable sense) with an untagged type target are considered view
|
|
-- conversions and hence variables.
|
|
|
|
function Is_OK_Volatile_Context
|
|
(Context : Node_Id;
|
|
Obj_Ref : Node_Id) return Boolean;
|
|
-- Determine whether node Context denotes a "non-interfering context" (as
|
|
-- defined in SPARK RM 7.1.3(12)) where volatile reference Obj_Ref can
|
|
-- safely reside.
|
|
|
|
function Is_Package_Contract_Annotation (Item : Node_Id) return Boolean;
|
|
-- Determine whether aspect specification or pragma Item is one of the
|
|
-- following package contract annotations:
|
|
-- Abstract_State
|
|
-- Initial_Condition
|
|
-- Initializes
|
|
-- Refined_State
|
|
|
|
function Is_Partially_Initialized_Type
|
|
(Typ : Entity_Id;
|
|
Include_Implicit : Boolean := True) return Boolean;
|
|
-- Typ is a type entity. This function returns true if this type is partly
|
|
-- initialized, meaning that an object of the type is at least partly
|
|
-- initialized (in particular in the record case, that at least one
|
|
-- component has an initialization expression). Note that initialization
|
|
-- resulting from the use of pragma Normalize_Scalars does not count.
|
|
-- Include_Implicit controls whether implicit initialization of access
|
|
-- values to null, and of discriminant values, is counted as making the
|
|
-- type be partially initialized. For the default setting of True, these
|
|
-- implicit cases do count, and discriminated types or types containing
|
|
-- access values not explicitly initialized will return True. Otherwise
|
|
-- if Include_Implicit is False, these cases do not count as making the
|
|
-- type be partially initialized.
|
|
|
|
function Is_Potentially_Unevaluated (N : Node_Id) return Boolean;
|
|
-- Predicate to implement definition given in RM 6.1.1 (20/3)
|
|
|
|
function Is_Potentially_Persistent_Type (T : Entity_Id) return Boolean;
|
|
-- Determines if type T is a potentially persistent type. A potentially
|
|
-- persistent type is defined (recursively) as a scalar type, an untagged
|
|
-- record whose components are all of a potentially persistent type, or an
|
|
-- array with all static constraints whose component type is potentially
|
|
-- persistent. A private type is potentially persistent if the full type
|
|
-- is potentially persistent.
|
|
|
|
function Is_Protected_Self_Reference (N : Node_Id) return Boolean;
|
|
-- Return True if node N denotes a protected type name which represents
|
|
-- the current instance of a protected object according to RM 9.4(21/2).
|
|
|
|
function Is_RCI_Pkg_Spec_Or_Body (Cunit : Node_Id) return Boolean;
|
|
-- Return True if a compilation unit is the specification or the
|
|
-- body of a remote call interface package.
|
|
|
|
function Is_Remote_Access_To_Class_Wide_Type (E : Entity_Id) return Boolean;
|
|
-- Return True if E is a remote access-to-class-wide type
|
|
|
|
function Is_Remote_Access_To_Subprogram_Type (E : Entity_Id) return Boolean;
|
|
-- Return True if E is a remote access to subprogram type
|
|
|
|
function Is_Remote_Call (N : Node_Id) return Boolean;
|
|
-- Return True if N denotes a potentially remote call
|
|
|
|
function Is_Renamed_Entry (Proc_Nam : Entity_Id) return Boolean;
|
|
-- Return True if Proc_Nam is a procedure renaming of an entry
|
|
|
|
function Is_Renaming_Declaration (N : Node_Id) return Boolean;
|
|
-- Determine whether arbitrary node N denotes a renaming declaration
|
|
|
|
function Is_Reversible_Iterator (Typ : Entity_Id) return Boolean;
|
|
-- AI05-0139-2: Check whether Typ is derived from the predefined interface
|
|
-- Ada.Iterator_Interfaces.Reversible_Iterator.
|
|
|
|
function Is_Selector_Name (N : Node_Id) return Boolean;
|
|
-- Given an N_Identifier node N, determines if it is a Selector_Name.
|
|
-- As described in Sinfo, Selector_Names are special because they
|
|
-- represent use of the N_Identifier node for a true identifier, when
|
|
-- normally such nodes represent a direct name.
|
|
|
|
function Is_Single_Concurrent_Object (Id : Entity_Id) return Boolean;
|
|
-- Determine whether arbitrary entity Id denotes the anonymous object
|
|
-- created for a single protected or single task type.
|
|
|
|
function Is_Single_Concurrent_Type (Id : Entity_Id) return Boolean;
|
|
-- Determine whether arbitrary entity Id denotes a single protected or
|
|
-- single task type.
|
|
|
|
function Is_Single_Concurrent_Type_Declaration (N : Node_Id) return Boolean;
|
|
-- Determine whether arbitrary node N denotes the declaration of a single
|
|
-- protected type or single task type.
|
|
|
|
function Is_Single_Precision_Floating_Point_Type
|
|
(E : Entity_Id) return Boolean;
|
|
-- Return whether E is a single precision floating point type,
|
|
-- characterized by:
|
|
-- . machine_radix = 2
|
|
-- . machine_mantissa = 24
|
|
-- . machine_emax = 2**7
|
|
-- . machine_emin = 3 - machine_emax
|
|
|
|
function Is_Single_Protected_Object (Id : Entity_Id) return Boolean;
|
|
-- Determine whether arbitrary entity Id denotes the anonymous object
|
|
-- created for a single protected type.
|
|
|
|
function Is_Single_Task_Object (Id : Entity_Id) return Boolean;
|
|
-- Determine whether arbitrary entity Id denotes the anonymous object
|
|
-- created for a single task type.
|
|
|
|
function Is_SPARK_05_Initialization_Expr (N : Node_Id) return Boolean;
|
|
-- Determines if the tree referenced by N represents an initialization
|
|
-- expression in SPARK 2005, suitable for initializing an object in an
|
|
-- object declaration.
|
|
|
|
function Is_SPARK_05_Object_Reference (N : Node_Id) return Boolean;
|
|
-- Determines if the tree referenced by N represents an object in SPARK
|
|
-- 2005. This differs from Is_Object_Reference in that only variables,
|
|
-- constants, formal parameters, and selected_components of those are
|
|
-- valid objects in SPARK 2005.
|
|
|
|
function Is_Specific_Tagged_Type (Typ : Entity_Id) return Boolean;
|
|
-- Determine whether an arbitrary [private] type is specifically tagged
|
|
|
|
function Is_Statement (N : Node_Id) return Boolean;
|
|
pragma Inline (Is_Statement);
|
|
-- Check if the node N is a statement node. Note that this includes
|
|
-- the case of procedure call statements (unlike the direct use of
|
|
-- the N_Statement_Other_Than_Procedure_Call subtype from Sinfo).
|
|
-- Note that a label is *not* a statement, and will return False.
|
|
|
|
function Is_Subprogram_Contract_Annotation (Item : Node_Id) return Boolean;
|
|
-- Determine whether aspect specification or pragma Item is one of the
|
|
-- following subprogram contract annotations:
|
|
-- Contract_Cases
|
|
-- Depends
|
|
-- Extensions_Visible
|
|
-- Global
|
|
-- Post
|
|
-- Post_Class
|
|
-- Postcondition
|
|
-- Pre
|
|
-- Pre_Class
|
|
-- Precondition
|
|
-- Refined_Depends
|
|
-- Refined_Global
|
|
-- Refined_Post
|
|
-- Test_Case
|
|
|
|
function Is_Subprogram_Stub_Without_Prior_Declaration
|
|
(N : Node_Id) return Boolean;
|
|
-- Return True if N is a subprogram stub with no prior subprogram
|
|
-- declaration.
|
|
|
|
function Is_Suspension_Object (Id : Entity_Id) return Boolean;
|
|
-- Determine whether arbitrary entity Id denotes Suspension_Object defined
|
|
-- in Ada.Synchronous_Task_Control.
|
|
|
|
function Is_Synchronized_Object (Id : Entity_Id) return Boolean;
|
|
-- Determine whether entity Id denotes an object and if it does, whether
|
|
-- this object is synchronized as specified in SPARK RM 9.1. To qualify as
|
|
-- such, the object must be
|
|
-- * Of a type that yields a synchronized object
|
|
-- * An atomic object with enabled Async_Writers
|
|
-- * A constant
|
|
-- * A variable subject to pragma Constant_After_Elaboration
|
|
|
|
function Is_Synchronized_Tagged_Type (E : Entity_Id) return Boolean;
|
|
-- Returns True if E is a synchronized tagged type (AARM 3.9.4 (6/2))
|
|
|
|
function Is_Transfer (N : Node_Id) return Boolean;
|
|
-- Returns True if the node N is a statement which is known to cause an
|
|
-- unconditional transfer of control at runtime, i.e. the following
|
|
-- statement definitely will not be executed.
|
|
|
|
function Is_True (U : Uint) return Boolean;
|
|
pragma Inline (Is_True);
|
|
-- The argument is a Uint value which is the Boolean'Pos value of a Boolean
|
|
-- operand (i.e. is either 0 for False, or 1 for True). This function tests
|
|
-- if it is True (i.e. non-zero).
|
|
|
|
function Is_Unchecked_Conversion_Instance (Id : Entity_Id) return Boolean;
|
|
-- Determine whether an arbitrary entity denotes an instance of function
|
|
-- Ada.Unchecked_Conversion.
|
|
|
|
function Is_Universal_Numeric_Type (T : Entity_Id) return Boolean;
|
|
pragma Inline (Is_Universal_Numeric_Type);
|
|
-- True if T is Universal_Integer or Universal_Real
|
|
|
|
function Is_Variable_Size_Array (E : Entity_Id) return Boolean;
|
|
-- Returns true if E has variable size components
|
|
|
|
function Is_Variable_Size_Record (E : Entity_Id) return Boolean;
|
|
-- Returns true if E has variable size components
|
|
|
|
function Is_Variable
|
|
(N : Node_Id;
|
|
Use_Original_Node : Boolean := True) return Boolean;
|
|
-- Determines if the tree referenced by N represents a variable, i.e. can
|
|
-- appear on the left side of an assignment. There is one situation (formal
|
|
-- parameters) in which untagged type conversions are also considered
|
|
-- variables, but Is_Variable returns False for such cases, since it has
|
|
-- no knowledge of the context. Note that this is the point at which
|
|
-- Assignment_OK is checked, and True is returned for any tree thus marked.
|
|
-- Use_Original_Node is used to perform the test on Original_Node (N). By
|
|
-- default is True since this routine is commonly invoked as part of the
|
|
-- semantic analysis and it must not be disturbed by the rewriten nodes.
|
|
|
|
function Is_Visibly_Controlled (T : Entity_Id) return Boolean;
|
|
-- Check whether T is derived from a visibly controlled type. This is true
|
|
-- if the root type is declared in Ada.Finalization. If T is derived
|
|
-- instead from a private type whose full view is controlled, an explicit
|
|
-- Initialize/Adjust/Finalize subprogram does not override the inherited
|
|
-- one.
|
|
|
|
function Is_Volatile_Function (Func_Id : Entity_Id) return Boolean;
|
|
-- Determine whether [generic] function Func_Id is subject to enabled
|
|
-- pragma Volatile_Function. Protected functions are treated as volatile
|
|
-- (SPARK RM 7.1.2).
|
|
|
|
function Is_Volatile_Object (N : Node_Id) return Boolean;
|
|
-- Determines if the given node denotes an volatile object in the sense of
|
|
-- the legality checks described in RM C.6(12). Note that the test here is
|
|
-- for something actually declared as volatile, not for an object that gets
|
|
-- treated as volatile (see Einfo.Treat_As_Volatile).
|
|
|
|
function Itype_Has_Declaration (Id : Entity_Id) return Boolean;
|
|
-- Applies to Itypes. True if the Itype is attached to a declaration for
|
|
-- the type through its Parent field, which may or not be present in the
|
|
-- tree.
|
|
|
|
procedure Kill_Current_Values (Last_Assignment_Only : Boolean := False);
|
|
-- This procedure is called to clear all constant indications from all
|
|
-- entities in the current scope and in any parent scopes if the current
|
|
-- scope is a block or a package (and that recursion continues to the top
|
|
-- scope that is not a block or a package). This is used when the
|
|
-- sequential flow-of-control assumption is violated (occurrence of a
|
|
-- label, head of a loop, or start of an exception handler). The effect of
|
|
-- the call is to clear the Current_Value field (but we do not need to
|
|
-- clear the Is_True_Constant flag, since that only gets reset if there
|
|
-- really is an assignment somewhere in the entity scope). This procedure
|
|
-- also calls Kill_All_Checks, since this is a special case of needing to
|
|
-- forget saved values. This procedure also clears the Is_Known_Null and
|
|
-- Is_Known_Non_Null and Is_Known_Valid flags in variables, constants or
|
|
-- parameters since these are also not known to be trustable any more.
|
|
--
|
|
-- The Last_Assignment_Only flag is set True to clear only Last_Assignment
|
|
-- fields and leave other fields unchanged. This is used when we encounter
|
|
-- an unconditional flow of control change (return, goto, raise). In such
|
|
-- cases we don't need to clear the current values, since it may be that
|
|
-- the flow of control change occurs in a conditional context, and if it
|
|
-- is not taken, then it is just fine to keep the current values. But the
|
|
-- Last_Assignment field is different, if we have a sequence assign-to-v,
|
|
-- conditional-return, assign-to-v, we do not want to complain that the
|
|
-- second assignment clobbers the first.
|
|
|
|
procedure Kill_Current_Values
|
|
(Ent : Entity_Id;
|
|
Last_Assignment_Only : Boolean := False);
|
|
-- This performs the same processing as described above for the form with
|
|
-- no argument, but for the specific entity given. The call has no effect
|
|
-- if the entity Ent is not for an object. Last_Assignment_Only has the
|
|
-- same meaning as for the call with no Ent.
|
|
|
|
procedure Kill_Size_Check_Code (E : Entity_Id);
|
|
-- Called when an address clause or pragma Import is applied to an entity.
|
|
-- If the entity is a variable or a constant, and size check code is
|
|
-- present, this size check code is killed, since the object will not be
|
|
-- allocated by the program.
|
|
|
|
function Known_To_Be_Assigned (N : Node_Id) return Boolean;
|
|
-- The node N is an entity reference. This function determines whether the
|
|
-- reference is for sure an assignment of the entity, returning True if
|
|
-- so. This differs from May_Be_Lvalue in that it defaults in the other
|
|
-- direction. Cases which may possibly be assignments but are not known to
|
|
-- be may return True from May_Be_Lvalue, but False from this function.
|
|
|
|
function Last_Source_Statement (HSS : Node_Id) return Node_Id;
|
|
-- HSS is a handled statement sequence. This function returns the last
|
|
-- statement in Statements (HSS) that has Comes_From_Source set. If no
|
|
-- such statement exists, Empty is returned.
|
|
|
|
function Matching_Static_Array_Bounds
|
|
(L_Typ : Node_Id;
|
|
R_Typ : Node_Id) return Boolean;
|
|
-- L_Typ and R_Typ are two array types. Returns True when they have the
|
|
-- same number of dimensions, and the same static bounds for each index
|
|
-- position.
|
|
|
|
procedure Mark_Coextensions (Context_Nod : Node_Id; Root_Nod : Node_Id);
|
|
-- Given a node which designates the context of analysis and an origin in
|
|
-- the tree, traverse from Root_Nod and mark all allocators as either
|
|
-- dynamic or static depending on Context_Nod. Any incorrect marking is
|
|
-- cleaned up during resolution.
|
|
|
|
function May_Be_Lvalue (N : Node_Id) return Boolean;
|
|
-- Determines if N could be an lvalue (e.g. an assignment left hand side).
|
|
-- An lvalue is defined as any expression which appears in a context where
|
|
-- a name is required by the syntax, and the identity, rather than merely
|
|
-- the value of the node is needed (for example, the prefix of an Access
|
|
-- attribute is in this category). Note that, as implied by the name, this
|
|
-- test is conservative. If it cannot be sure that N is NOT an lvalue, then
|
|
-- it returns True. It tries hard to get the answer right, but it is hard
|
|
-- to guarantee this in all cases. Note that it is more possible to give
|
|
-- correct answer if the tree is fully analyzed.
|
|
|
|
function Needs_One_Actual (E : Entity_Id) return Boolean;
|
|
-- Returns True if a function has defaults for all but its first
|
|
-- formal. Used in Ada 2005 mode to solve the syntactic ambiguity that
|
|
-- results from an indexing of a function call written in prefix form.
|
|
|
|
function New_Copy_List_Tree (List : List_Id) return List_Id;
|
|
-- Copy recursively an analyzed list of nodes. Uses New_Copy_Tree defined
|
|
-- below. As for New_Copy_Tree, it is illegal to attempt to copy extended
|
|
-- nodes (entities) either directly or indirectly using this function.
|
|
|
|
function New_Copy_Tree
|
|
(Source : Node_Id;
|
|
Map : Elist_Id := No_Elist;
|
|
New_Sloc : Source_Ptr := No_Location;
|
|
New_Scope : Entity_Id := Empty) return Node_Id;
|
|
-- Given a node that is the root of a subtree, Copy_Tree copies the entire
|
|
-- syntactic subtree, including recursively any descendants whose parent
|
|
-- field references a copied node (descendants not linked to a copied node
|
|
-- by the parent field are not copied, instead the copied tree references
|
|
-- the same descendant as the original in this case, which is appropriate
|
|
-- for non-syntactic fields such as Etype). The parent pointers in the
|
|
-- copy are properly set. Copy_Tree (Empty/Error) returns Empty/Error.
|
|
-- The one exception to the rule of not copying semantic fields is that
|
|
-- any implicit types attached to the subtree are duplicated, so that
|
|
-- the copy contains a distinct set of implicit type entities. Thus this
|
|
-- function is used when it is necessary to duplicate an analyzed tree,
|
|
-- declared in the same or some other compilation unit. This function is
|
|
-- declared here rather than in atree because it uses semantic information
|
|
-- in particular concerning the structure of itypes and the generation of
|
|
-- public symbols.
|
|
|
|
-- The Map argument, if set to a non-empty Elist, specifies a set of
|
|
-- mappings to be applied to entities in the tree. The map has the form:
|
|
--
|
|
-- old entity 1
|
|
-- new entity to replace references to entity 1
|
|
-- old entity 2
|
|
-- new entity to replace references to entity 2
|
|
-- ...
|
|
--
|
|
-- The call destroys the contents of Map in this case
|
|
--
|
|
-- The parameter New_Sloc, if set to a value other than No_Location, is
|
|
-- used as the Sloc value for all nodes in the new copy. If New_Sloc is
|
|
-- set to its default value No_Location, then the Sloc values of the
|
|
-- nodes in the copy are simply copied from the corresponding original.
|
|
--
|
|
-- The Comes_From_Source indication is unchanged if New_Sloc is set to
|
|
-- the default No_Location value, but is reset if New_Sloc is given, since
|
|
-- in this case the result clearly is neither a source node or an exact
|
|
-- copy of a source node.
|
|
--
|
|
-- The parameter New_Scope, if set to a value other than Empty, is the
|
|
-- value to use as the Scope for any Itypes that are copied. The most
|
|
-- typical value for this parameter, if given, is Current_Scope.
|
|
|
|
function New_External_Entity
|
|
(Kind : Entity_Kind;
|
|
Scope_Id : Entity_Id;
|
|
Sloc_Value : Source_Ptr;
|
|
Related_Id : Entity_Id;
|
|
Suffix : Character;
|
|
Suffix_Index : Nat := 0;
|
|
Prefix : Character := ' ') return Entity_Id;
|
|
-- This function creates an N_Defining_Identifier node for an internal
|
|
-- created entity, such as an implicit type or subtype, or a record
|
|
-- initialization procedure. The entity name is constructed with a call
|
|
-- to New_External_Name (Related_Id, Suffix, Suffix_Index, Prefix), so
|
|
-- that the generated name may be referenced as a public entry, and the
|
|
-- Is_Public flag is set if needed (using Set_Public_Status). If the
|
|
-- entity is for a type or subtype, the size/align fields are initialized
|
|
-- to unknown (Uint_0).
|
|
|
|
function New_Internal_Entity
|
|
(Kind : Entity_Kind;
|
|
Scope_Id : Entity_Id;
|
|
Sloc_Value : Source_Ptr;
|
|
Id_Char : Character) return Entity_Id;
|
|
-- This function is similar to New_External_Entity, except that the
|
|
-- name is constructed by New_Internal_Name (Id_Char). This is used
|
|
-- when the resulting entity does not have to be referenced as a
|
|
-- public entity (and in this case Is_Public is not set).
|
|
|
|
procedure Next_Actual (Actual_Id : in out Node_Id);
|
|
pragma Inline (Next_Actual);
|
|
-- Next_Actual (N) is equivalent to N := Next_Actual (N). Note that we
|
|
-- inline this procedural form, but not the functional form that follows.
|
|
|
|
function Next_Actual (Actual_Id : Node_Id) return Node_Id;
|
|
-- Find next actual parameter in declaration order. As described for
|
|
-- First_Actual, this is the next actual in the declaration order, not
|
|
-- the call order, so this does not correspond to simply taking the
|
|
-- next entry of the Parameter_Associations list. The argument is an
|
|
-- actual previously returned by a call to First_Actual or Next_Actual.
|
|
-- Note that the result produced is always an expression, not a parameter
|
|
-- association node, even if named notation was used.
|
|
|
|
procedure Normalize_Actuals
|
|
(N : Node_Id;
|
|
S : Entity_Id;
|
|
Report : Boolean;
|
|
Success : out Boolean);
|
|
-- Reorders lists of actuals according to names of formals, value returned
|
|
-- in Success indicates success of reordering. For more details, see body.
|
|
-- Errors are reported only if Report is set to True.
|
|
|
|
procedure Note_Possible_Modification (N : Node_Id; Sure : Boolean);
|
|
-- This routine is called if the sub-expression N maybe the target of
|
|
-- an assignment (e.g. it is the left side of an assignment, used as
|
|
-- an out parameters, or used as prefixes of access attributes). It
|
|
-- sets May_Be_Modified in the associated entity if there is one,
|
|
-- taking into account the rule that in the case of renamed objects,
|
|
-- it is the flag in the renamed object that must be set.
|
|
--
|
|
-- The parameter Sure is set True if the modification is sure to occur
|
|
-- (e.g. target of assignment, or out parameter), and to False if the
|
|
-- modification is only potential (e.g. address of entity taken).
|
|
|
|
function Null_To_Null_Address_Convert_OK
|
|
(N : Node_Id;
|
|
Typ : Entity_Id := Empty) return Boolean;
|
|
-- Return True if we are compiling in relaxed RM semantics mode and:
|
|
-- 1) N is a N_Null node and Typ is a descendant of System.Address, or
|
|
-- 2) N is a comparison operator, one of the operands is null, and the
|
|
-- type of the other operand is a descendant of System.Address.
|
|
|
|
function Object_Access_Level (Obj : Node_Id) return Uint;
|
|
-- Return the accessibility level of the view of the object Obj. For
|
|
-- convenience, qualified expressions applied to object names are also
|
|
-- allowed as actuals for this function.
|
|
|
|
function Original_Aspect_Pragma_Name (N : Node_Id) return Name_Id;
|
|
-- Retrieve the name of aspect or pragma N taking into account a possible
|
|
-- rewrite and whether the pragma is generated from an aspect as the names
|
|
-- may be different. The routine also deals with 'Class in which case it
|
|
-- returns the following values:
|
|
--
|
|
-- Invariant -> Name_uInvariant
|
|
-- Post'Class -> Name_uPost
|
|
-- Pre'Class -> Name_uPre
|
|
-- Type_Invariant -> Name_uType_Invariant
|
|
-- Type_Invariant'Class -> Name_uType_Invariant
|
|
|
|
function Original_Corresponding_Operation (S : Entity_Id) return Entity_Id;
|
|
-- [Ada 2012: AI05-0125-1]: If S is an inherited dispatching primitive S2,
|
|
-- or overrides an inherited dispatching primitive S2, the original
|
|
-- corresponding operation of S is the original corresponding operation of
|
|
-- S2. Otherwise, it is S itself.
|
|
|
|
procedure Output_Entity (Id : Entity_Id);
|
|
-- Print entity Id to standard output. The name of the entity appears in
|
|
-- fully qualified form.
|
|
--
|
|
-- WARNING: this routine should be used in debugging scenarios such as
|
|
-- tracking down undefined symbols as it is fairly low level.
|
|
|
|
procedure Output_Name (Nam : Name_Id; Scop : Entity_Id := Current_Scope);
|
|
-- Print name Nam to standard output. The name appears in fully qualified
|
|
-- form assuming it appears in scope Scop. Note that this may not reflect
|
|
-- the final qualification as the entity which carries the name may be
|
|
-- relocated to a different scope.
|
|
--
|
|
-- WARNING: this routine should be used in debugging scenarios such as
|
|
-- tracking down undefined symbols as it is fairly low level.
|
|
|
|
function Policy_In_Effect (Policy : Name_Id) return Name_Id;
|
|
-- Given a policy, return the policy identifier associated with it. If no
|
|
-- such policy is in effect, the value returned is No_Name.
|
|
|
|
function Predicate_Tests_On_Arguments (Subp : Entity_Id) return Boolean;
|
|
-- Subp is the entity for a subprogram call. This function returns True if
|
|
-- predicate tests are required for the arguments in this call (this is the
|
|
-- normal case). It returns False for special cases where these predicate
|
|
-- tests should be skipped (see body for details).
|
|
|
|
function Primitive_Names_Match (E1, E2 : Entity_Id) return Boolean;
|
|
-- Returns True if the names of both entities correspond with matching
|
|
-- primitives. This routine includes support for the case in which one
|
|
-- or both entities correspond with entities built by Derive_Subprogram
|
|
-- with a special name to avoid being overridden (i.e. return true in case
|
|
-- of entities with names "nameP" and "name" or vice versa).
|
|
|
|
function Private_Component (Type_Id : Entity_Id) return Entity_Id;
|
|
-- Returns some private component (if any) of the given Type_Id.
|
|
-- Used to enforce the rules on visibility of operations on composite
|
|
-- types, that depend on the full view of the component type. For a
|
|
-- record type there may be several such components, we just return
|
|
-- the first one.
|
|
|
|
procedure Process_End_Label
|
|
(N : Node_Id;
|
|
Typ : Character;
|
|
Ent : Entity_Id);
|
|
-- N is a node whose End_Label is to be processed, generating all
|
|
-- appropriate cross-reference entries, and performing style checks
|
|
-- for any identifier references in the end label. Typ is either
|
|
-- 'e' or 't indicating the type of the cross-reference entity
|
|
-- (e for spec, t for body, see Lib.Xref spec for details). The
|
|
-- parameter Ent gives the entity to which the End_Label refers,
|
|
-- and to which cross-references are to be generated.
|
|
|
|
procedure Propagate_Invariant_Attributes
|
|
(Typ : Entity_Id;
|
|
From_Typ : Entity_Id);
|
|
-- Inherit all invariant-related attributes form type From_Typ. Typ is the
|
|
-- destination type.
|
|
|
|
procedure Propagate_Concurrent_Flags
|
|
(Typ : Entity_Id;
|
|
Comp_Typ : Entity_Id);
|
|
-- Set Has_Task, Has_Protected and Has_Timing_Event on Typ when the flags
|
|
-- are set on Comp_Typ. This follows the definition of these flags which
|
|
-- are set (recursively) on any composite type which has a component marked
|
|
-- by one of these flags. This procedure can only set flags for Typ, and
|
|
-- never clear them. Comp_Typ is the type of a component or a parent.
|
|
|
|
procedure Record_Possible_Part_Of_Reference
|
|
(Var_Id : Entity_Id;
|
|
Ref : Node_Id);
|
|
-- Save reference Ref to variable Var_Id when the variable is subject to
|
|
-- pragma Part_Of. If the variable is known to be a constituent of a single
|
|
-- protected/task type, the legality of the reference is verified and the
|
|
-- save does not take place.
|
|
|
|
function Referenced (Id : Entity_Id; Expr : Node_Id) return Boolean;
|
|
-- Determine whether entity Id is referenced within expression Expr
|
|
|
|
function References_Generic_Formal_Type (N : Node_Id) return Boolean;
|
|
-- Returns True if the expression Expr contains any references to a generic
|
|
-- type. This can only happen within a generic template.
|
|
|
|
procedure Remove_Homonym (E : Entity_Id);
|
|
-- Removes E from the homonym chain
|
|
|
|
procedure Remove_Overloaded_Entity (Id : Entity_Id);
|
|
-- Remove arbitrary entity Id from the homonym chain, the scope chain and
|
|
-- the primitive operations list of the associated controlling type. NOTE:
|
|
-- the removal performed by this routine does not affect the visibility of
|
|
-- existing homonyms.
|
|
|
|
function Remove_Suffix (E : Entity_Id; Suffix : Character) return Name_Id;
|
|
-- Returns the name of E without Suffix
|
|
|
|
procedure Replace_Null_By_Null_Address (N : Node_Id);
|
|
-- N is N_Null or a binary comparison operator, we are compiling in relaxed
|
|
-- RM semantics mode, and one of the operands is null. Replace null with
|
|
-- System.Null_Address.
|
|
|
|
function Rep_To_Pos_Flag (E : Entity_Id; Loc : Source_Ptr) return Node_Id;
|
|
-- This is used to construct the second argument in a call to Rep_To_Pos
|
|
-- which is Standard_True if range checks are enabled (E is an entity to
|
|
-- which the Range_Checks_Suppressed test is applied), and Standard_False
|
|
-- if range checks are suppressed. Loc is the location for the node that
|
|
-- is returned (which is a New_Occurrence of the appropriate entity).
|
|
--
|
|
-- Note: one might think that it would be fine to always use True and
|
|
-- to ignore the suppress in this case, but it is generally better to
|
|
-- believe a request to suppress exceptions if possible, and further
|
|
-- more there is at least one case in the generated code (the code for
|
|
-- array assignment in a loop) that depends on this suppression.
|
|
|
|
procedure Require_Entity (N : Node_Id);
|
|
-- N is a node which should have an entity value if it is an entity name.
|
|
-- If not, then check if there were previous errors. If so, just fill
|
|
-- in with Any_Id and ignore. Otherwise signal a program error exception.
|
|
-- This is used as a defense mechanism against ill-formed trees caused by
|
|
-- previous errors (particularly in -gnatq mode).
|
|
|
|
function Requires_Transient_Scope (Id : Entity_Id) return Boolean;
|
|
-- Id is a type entity. The result is True when temporaries of this type
|
|
-- need to be wrapped in a transient scope to be reclaimed properly when a
|
|
-- secondary stack is in use. Examples of types requiring such wrapping are
|
|
-- controlled types and variable-sized types including unconstrained
|
|
-- arrays.
|
|
|
|
procedure Reset_Analyzed_Flags (N : Node_Id);
|
|
-- Reset the Analyzed flags in all nodes of the tree whose root is N
|
|
|
|
procedure Restore_SPARK_Mode (Mode : SPARK_Mode_Type);
|
|
-- Set the current SPARK_Mode to whatever Mode denotes. This routime must
|
|
-- be used in tandem with Save_SPARK_Mode_And_Set.
|
|
|
|
function Returns_Unconstrained_Type (Subp : Entity_Id) return Boolean;
|
|
-- Return true if Subp is a function that returns an unconstrained type
|
|
|
|
function Root_Type_Of_Full_View (T : Entity_Id) return Entity_Id;
|
|
-- Similar to attribute Root_Type, but this version always follows the
|
|
-- Full_View of a private type (if available) while searching for the
|
|
-- ultimate derivation ancestor.
|
|
|
|
function Safe_To_Capture_Value
|
|
(N : Node_Id;
|
|
Ent : Entity_Id;
|
|
Cond : Boolean := False) return Boolean;
|
|
-- The caller is interested in capturing a value (either the current value,
|
|
-- or an indication that the value is non-null) for the given entity Ent.
|
|
-- This value can only be captured if sequential execution semantics can be
|
|
-- properly guaranteed so that a subsequent reference will indeed be sure
|
|
-- that this current value indication is correct. The node N is the
|
|
-- construct which resulted in the possible capture of the value (this
|
|
-- is used to check if we are in a conditional).
|
|
--
|
|
-- Cond is used to skip the test for being inside a conditional. It is used
|
|
-- in the case of capturing values from if/while tests, which already do a
|
|
-- proper job of handling scoping issues without this help.
|
|
--
|
|
-- The only entities whose values can be captured are OUT and IN OUT formal
|
|
-- parameters, and variables unless Cond is True, in which case we also
|
|
-- allow IN formals, loop parameters and constants, where we cannot ever
|
|
-- capture actual value information, but we can capture conditional tests.
|
|
|
|
function Same_Name (N1, N2 : Node_Id) return Boolean;
|
|
-- Determine if two (possibly expanded) names are the same name. This is
|
|
-- a purely syntactic test, and N1 and N2 need not be analyzed.
|
|
|
|
function Same_Object (Node1, Node2 : Node_Id) return Boolean;
|
|
-- Determine if Node1 and Node2 are known to designate the same object.
|
|
-- This is a semantic test and both nodes must be fully analyzed. A result
|
|
-- of True is decisively correct. A result of False does not necessarily
|
|
-- mean that different objects are designated, just that this could not
|
|
-- be reliably determined at compile time.
|
|
|
|
function Same_Type (T1, T2 : Entity_Id) return Boolean;
|
|
-- Determines if T1 and T2 represent exactly the same type. Two types
|
|
-- are the same if they are identical, or if one is an unconstrained
|
|
-- subtype of the other, or they are both common subtypes of the same
|
|
-- type with identical constraints. The result returned is conservative.
|
|
-- It is True if the types are known to be the same, but a result of
|
|
-- False is indecisive (e.g. the compiler may not be able to tell that
|
|
-- two constraints are identical).
|
|
|
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function Same_Value (Node1, Node2 : Node_Id) return Boolean;
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-- Determines if Node1 and Node2 are known to be the same value, which is
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-- true if they are both compile time known values and have the same value,
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-- or if they are the same object (in the sense of function Same_Object).
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-- A result of False does not necessarily mean they have different values,
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-- just that it is not possible to determine they have the same value.
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procedure Save_SPARK_Mode_And_Set
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(Context : Entity_Id;
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Mode : out SPARK_Mode_Type);
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-- Save the current SPARK_Mode in effect in Mode. Establish the SPARK_Mode
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-- (if any) of a package or a subprogram denoted by Context. This routine
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-- must be used in tandem with Restore_SPARK_Mode.
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function Scalar_Part_Present (T : Entity_Id) return Boolean;
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-- Tests if type T can be determined at compile time to have at least one
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-- scalar part in the sense of the Valid_Scalars attribute. Returns True if
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-- this is the case, and False if no scalar parts are present (meaning that
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-- the result of Valid_Scalars applied to T is always vacuously True).
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function Scope_Within_Or_Same (Scope1, Scope2 : Entity_Id) return Boolean;
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-- Determines if the entity Scope1 is the same as Scope2, or if it is
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-- inside it, where both entities represent scopes. Note that scopes
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-- are only partially ordered, so Scope_Within_Or_Same (A,B) and
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-- Scope_Within_Or_Same (B,A) can both be False for a given pair A,B.
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function Scope_Within (Scope1, Scope2 : Entity_Id) return Boolean;
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-- Like Scope_Within_Or_Same, except that this function returns
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-- False in the case where Scope1 and Scope2 are the same scope.
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procedure Set_Convention (E : Entity_Id; Val : Convention_Id);
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-- Same as Basic_Set_Convention, but with an extra check for access types.
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-- In particular, if E is an access-to-subprogram type, and Val is a
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-- foreign convention, then we set Can_Use_Internal_Rep to False on E.
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-- Also, if the Etype of E is set and is an anonymous access type with
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-- no convention set, this anonymous type inherits the convention of E.
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procedure Set_Current_Entity (E : Entity_Id);
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pragma Inline (Set_Current_Entity);
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-- Establish the entity E as the currently visible definition of its
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-- associated name (i.e. the Node_Id associated with its name).
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procedure Set_Debug_Info_Needed (T : Entity_Id);
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-- Sets the Debug_Info_Needed flag on entity T , and also on any entities
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-- that are needed by T (for an object, the type of the object is needed,
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-- and for a type, various subsidiary types are needed -- see body for
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-- details). Never has any effect on T if the Debug_Info_Off flag is set.
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-- This routine should always be used instead of Set_Needs_Debug_Info to
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-- ensure that subsidiary entities are properly handled.
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procedure Set_Entity_With_Checks (N : Node_Id; Val : Entity_Id);
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-- This procedure has the same calling sequence as Set_Entity, but it
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-- performs additional checks as follows:
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--
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-- If Style_Check is set, then it calls a style checking routine which
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-- can check identifier spelling style. This procedure also takes care
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-- of checking the restriction No_Implementation_Identifiers.
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--
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-- If restriction No_Abort_Statements is set, then it checks that the
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-- entity is not Ada.Task_Identification.Abort_Task.
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--
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-- If restriction No_Dynamic_Attachment is set, then it checks that the
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-- entity is not one of the restricted names for this restriction.
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--
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-- If restriction No_Long_Long_Integers is set, then it checks that the
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-- entity is not Standard.Long_Long_Integer.
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--
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-- If restriction No_Implementation_Identifiers is set, then it checks
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-- that the entity is not implementation defined.
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procedure Set_Name_Entity_Id (Id : Name_Id; Val : Entity_Id);
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pragma Inline (Set_Name_Entity_Id);
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-- Sets the Entity_Id value associated with the given name, which is the
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-- Id of the innermost visible entity with the given name. See the body
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|
-- of package Sem_Ch8 for further details on the handling of visibility.
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procedure Set_Next_Actual (Ass1_Id : Node_Id; Ass2_Id : Node_Id);
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|
-- The arguments may be parameter associations, whose descendants
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|
-- are the optional formal name and the actual parameter. Positional
|
|
-- parameters are already members of a list, and do not need to be
|
|
-- chained separately. See also First_Actual and Next_Actual.
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procedure Set_Optimize_Alignment_Flags (E : Entity_Id);
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|
pragma Inline (Set_Optimize_Alignment_Flags);
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|
-- Sets Optimize_Alignment_Space/Time flags in E from current settings
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|
|
|
procedure Set_Public_Status (Id : Entity_Id);
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|
-- If an entity (visible or otherwise) is defined in a library
|
|
-- package, or a package that is itself public, then this subprogram
|
|
-- labels the entity public as well.
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|
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procedure Set_Referenced_Modified (N : Node_Id; Out_Param : Boolean);
|
|
-- N is the node for either a left hand side (Out_Param set to False),
|
|
-- or an Out or In_Out parameter (Out_Param set to True). If there is
|
|
-- an assignable entity being referenced, then the appropriate flag
|
|
-- (Referenced_As_LHS if Out_Param is False, Referenced_As_Out_Parameter
|
|
-- if Out_Param is True) is set True, and the other flag set False.
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|
|
|
procedure Set_Scope_Is_Transient (V : Boolean := True);
|
|
-- Set the flag Is_Transient of the current scope
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|
|
|
procedure Set_Size_Info (T1, T2 : Entity_Id);
|
|
pragma Inline (Set_Size_Info);
|
|
-- Copies the Esize field and Has_Biased_Representation flag from sub(type)
|
|
-- entity T2 to (sub)type entity T1. Also copies the Is_Unsigned_Type flag
|
|
-- in the fixed-point and discrete cases, and also copies the alignment
|
|
-- value from T2 to T1. It does NOT copy the RM_Size field, which must be
|
|
-- separately set if this is required to be copied also.
|
|
|
|
function Scope_Is_Transient return Boolean;
|
|
-- True if the current scope is transient
|
|
|
|
function Static_Boolean (N : Node_Id) return Uint;
|
|
-- This function analyzes the given expression node and then resolves it
|
|
-- as Standard.Boolean. If the result is static, then Uint_1 or Uint_0 is
|
|
-- returned corresponding to the value, otherwise an error message is
|
|
-- output and No_Uint is returned.
|
|
|
|
function Static_Integer (N : Node_Id) return Uint;
|
|
-- This function analyzes the given expression node and then resolves it
|
|
-- as any integer type. If the result is static, then the value of the
|
|
-- universal expression is returned, otherwise an error message is output
|
|
-- and a value of No_Uint is returned.
|
|
|
|
function Statically_Different (E1, E2 : Node_Id) return Boolean;
|
|
-- Return True if it can be statically determined that the Expressions
|
|
-- E1 and E2 refer to different objects
|
|
|
|
function Subject_To_Loop_Entry_Attributes (N : Node_Id) return Boolean;
|
|
-- Determine whether node N is a loop statement subject to at least one
|
|
-- 'Loop_Entry attribute.
|
|
|
|
function Subprogram_Access_Level (Subp : Entity_Id) return Uint;
|
|
-- Return the accessibility level of the view denoted by Subp
|
|
|
|
function Support_Atomic_Primitives (Typ : Entity_Id) return Boolean;
|
|
-- Return True if Typ supports the GCC built-in atomic operations (i.e. if
|
|
-- Typ is properly sized and aligned).
|
|
|
|
procedure Trace_Scope (N : Node_Id; E : Entity_Id; Msg : String);
|
|
-- Print debugging information on entry to each unit being analyzed
|
|
|
|
procedure Transfer_Entities (From : Entity_Id; To : Entity_Id);
|
|
-- Move a list of entities from one scope to another, and recompute
|
|
-- Is_Public based upon the new scope.
|
|
|
|
function Type_Access_Level (Typ : Entity_Id) return Uint;
|
|
-- Return the accessibility level of Typ
|
|
|
|
function Type_Without_Stream_Operation
|
|
(T : Entity_Id;
|
|
Op : TSS_Name_Type := TSS_Null) return Entity_Id;
|
|
-- AI05-0161: In Ada 2012, if the restriction No_Default_Stream_Attributes
|
|
-- is active then we cannot generate stream subprograms for composite types
|
|
-- with elementary subcomponents that lack user-defined stream subprograms.
|
|
-- This predicate determines whether a type has such an elementary
|
|
-- subcomponent. If Op is TSS_Null, a type that lacks either Read or Write
|
|
-- prevents the construction of a composite stream operation. If Op is
|
|
-- specified we check only for the given stream operation.
|
|
|
|
function Unique_Defining_Entity (N : Node_Id) return Entity_Id;
|
|
-- Return the entity which represents declaration N, so that different
|
|
-- views of the same entity have the same unique defining entity:
|
|
-- * entry declaration and entry body
|
|
-- * package spec and body
|
|
-- * protected type declaration, protected body stub and protected body
|
|
-- * private view and full view of a deferred constant
|
|
-- * private view and full view of a type
|
|
-- * subprogram declaration, subprogram stub and subprogram body
|
|
-- * task type declaration, task body stub and task body
|
|
-- In other cases, return the defining entity for N.
|
|
|
|
function Unique_Entity (E : Entity_Id) return Entity_Id;
|
|
-- Return the unique entity for entity E, which would be returned by
|
|
-- Unique_Defining_Entity if applied to the enclosing declaration of E.
|
|
|
|
function Unique_Name (E : Entity_Id) return String;
|
|
-- Return a unique name for entity E, which could be used to identify E
|
|
-- across compilation units.
|
|
|
|
function Unit_Is_Visible (U : Entity_Id) return Boolean;
|
|
-- Determine whether a compilation unit is visible in the current context,
|
|
-- because there is a with_clause that makes the unit available. Used to
|
|
-- provide better messages on common visiblity errors on operators.
|
|
|
|
function Universal_Interpretation (Opnd : Node_Id) return Entity_Id;
|
|
-- Yields Universal_Integer or Universal_Real if this is a candidate
|
|
|
|
function Unqualify (Expr : Node_Id) return Node_Id;
|
|
pragma Inline (Unqualify);
|
|
-- Removes any qualifications from Expr. For example, for T1'(T2'(X)), this
|
|
-- returns X. If Expr is not a qualified expression, returns Expr.
|
|
|
|
function Visible_Ancestors (Typ : Entity_Id) return Elist_Id;
|
|
-- [Ada 2012:AI-0125-1]: Collect all the visible parents and progenitors
|
|
-- of a type extension or private extension declaration. If the full-view
|
|
-- of private parents and progenitors is available then it is used to
|
|
-- generate the list of visible ancestors; otherwise their partial
|
|
-- view is added to the resulting list.
|
|
|
|
function Within_Init_Proc return Boolean;
|
|
-- Determines if Current_Scope is within an init proc
|
|
|
|
function Within_Scope (E : Entity_Id; S : Entity_Id) return Boolean;
|
|
-- Returns True if entity E is declared within scope S
|
|
|
|
procedure Wrong_Type (Expr : Node_Id; Expected_Type : Entity_Id);
|
|
-- Output error message for incorrectly typed expression. Expr is the node
|
|
-- for the incorrectly typed construct (Etype (Expr) is the type found),
|
|
-- and Expected_Type is the entity for the expected type. Note that Expr
|
|
-- does not have to be a subexpression, anything with an Etype field may
|
|
-- be used.
|
|
|
|
function Yields_Synchronized_Object (Typ : Entity_Id) return Boolean;
|
|
-- Determine whether type Typ "yields synchronized object" as specified by
|
|
-- SPARK RM 9.1. To qualify as such, a type must be
|
|
-- * An array type whose element type yields a synchronized object
|
|
-- * A descendant of type Ada.Synchronous_Task_Control.Suspension_Object
|
|
-- * A protected type
|
|
-- * A record type or type extension without defaulted discriminants
|
|
-- whose components are of a type that yields a synchronized object.
|
|
-- * A synchronized interface type
|
|
-- * A task type
|
|
|
|
function Yields_Universal_Type (N : Node_Id) return Boolean;
|
|
-- Determine whether unanalyzed node N yields a universal type
|
|
|
|
end Sem_Util;
|