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------------------------------------------------------------------------------
-- --
-- ASIS-for-GNAT INTERFACE COMPONENTS --
-- --
-- A S I S . S T A T E M E N T S --
-- --
-- S p e c --
-- --
-- Copyright (C) 2006-2014, AdaCore --
-- --
-- This specification is adapted from the Ada Semantic Interface --
-- Specification Standard (ISO/IEC 15291) for use with GNAT. In accordance --
-- with the copyright of that document, you can freely copy and modify this --
-- specification, provided that if you redistribute a modified version, any --
-- changes that you have made are clearly indicated. --
-- --
-- This specification also contains suggestions and discussion items --
-- related to revising the ASIS Standard according to the changes proposed --
-- for the new revision of the Ada standard. The copyright notice above, --
-- and the license provisions that follow apply solely to these suggestions --
-- and discussion items that are separated by the corresponding comment --
-- sentinels --
-- --
-- ASIS-for-GNAT is free software; you can redistribute it and/or modify it --
-- under terms of the GNU General Public License as published by the Free --
-- Software Foundation; either version 3, or (at your option) any later --
-- version. ASIS-for-GNAT is distributed in the hope that it will be use- --
-- ful, but WITHOUT ANY WARRANTY; without even the implied warranty of MER- --
-- CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- --
-- --
-- --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- ASIS-for-GNAT was originally developed by the ASIS-for-GNAT team at the --
-- Software Engineering Laboratory of the Swiss Federal Institute of --
-- Technology (LGL-EPFL) in Lausanne, Switzerland, in cooperation with the --
-- Scientific Research Computer Center of Moscow State University (SRCC --
-- MSU), Russia, with funding partially provided by grants from the Swiss --
-- National Science Foundation and the Swiss Academy of Engineering --
-- Sciences. ASIS-for-GNAT is now maintained by AdaCore --
-- (http://www.adacore.com). --
-- --
------------------------------------------------------------------------------
------------------------------------------------------------------------------
-- 18 package Asis.Statements
-- Suggestions related to changing this specification to accept new Ada
-- features as defined in incoming revision of the Ada Standard (ISO 8652)
-- are marked by following comment sentinels:
--
-- --|A2005 start
-- ... the suggestion goes here ...
-- --|A2005 end
--
-- and the discussion items are marked by the comment sentinels of teh form:
--
-- --|D2005 start
-- ... the discussion item goes here ...
-- --|D2005 end
------------------------------------------------------------------------------
------------------------------------------------------------------------------
package Asis.Statements is
------------------------------------------------------------------------------
------------------------------------------------------------------------------
-- Asis.Statements encapsulates a set of queries that operate on A_Statement,
-- A_Path, and An_Exception_Handler elements.
------------------------------------------------------------------------------
------------------------------------------------------------------------------
-- 18.1 function Label_Names
------------------------------------------------------------------------------
function Label_Names
(Statement : Asis.Statement)
return Asis.Defining_Name_List;
------------------------------------------------------------------------------
-- Statement - Specifies the statement to query
--
-- Returns label_statement_identifier elements (A_Defining_Name elements) that
-- define the labels attached to the statement, in their order of appearance.
--
-- Returns a Nil_Element_List if there are no labels attached to the
-- statement.
--
-- The Enclosing_Element of the A_Defining_Name elements is the statement.
--
-- --|A2012 start
-- In case of 'floating' labels in Ada 2012 (labels that completes
-- sequence_of_statements and that are not attached to any statement) ASIS
-- treats them as being attached to the implicit A_Null_Statement element that
-- is the last Element in a statement list returned by the corresponding
-- structural query. Such an implicit A_Null_Statement can be the given as
-- the actual for this query to get 'floating' labels.
-- --|A2012 end
--
-- Appropriate Element_Kinds:
-- A_Statement
--
-- Returns Defining_Name_Kinds:
-- A_Defining_Identifier
--
------------------------------------------------------------------------------
-- 18.2 function Assignment_Variable_Name
------------------------------------------------------------------------------
function Assignment_Variable_Name
(Statement : Asis.Statement)
return Asis.Expression;
------------------------------------------------------------------------------
-- Statement - Specifies the assignment statement to query
--
-- Returns the expression that names the left hand side of the assignment.
--
-- Appropriate Element_Kinds:
-- A_Statement
--
-- Appropriate Statement_Kinds:
-- An_Assignment_Statement
--
-- Returns Element_Kinds:
-- An_Expression
--
------------------------------------------------------------------------------
-- 18.3 function Assignment_Expression
------------------------------------------------------------------------------
function Assignment_Expression
(Statement : Asis.Statement)
return Asis.Expression;
------------------------------------------------------------------------------
-- Statement - Specifies the assignment statement to query
--
-- Returns the expression from the right hand side of the assignment.
--
-- Appropriate Element_Kinds:
-- A_Statement
--
-- Appropriate Statement_Kinds:
-- An_Assignment_Statement
--
-- Returns Element_Kinds:
-- An_Expression
------------------------------------------------------------------------------
-- 18.4 function Statement_Paths
------------------------------------------------------------------------------
function Statement_Paths
(Statement : Asis.Statement;
Include_Pragmas : Boolean := False)
return Asis.Path_List;
------------------------------------------------------------------------------
-- Statement - Specifies the statement to query
-- Include_Pragmas - Specifies whether pragmas are to be returned
--
-- Returns a list of the execution paths of the statement, in
-- their order of appearance.
--
-- The only pragmas returned are those preceding the first alternative in
-- a case statement.
--
-- Appropriate Statement_Kinds:
-- An_If_Statement
-- A_Case_Statement
-- A_Selective_Accept_Statement
-- A_Timed_Entry_Call_Statement
-- A_Conditional_Entry_Call_Statement
-- An_Asynchronous_Select_Statement
--
-- Returns Element_Kinds:
-- A_Path
-- A_Pragma
--
------------------------------------------------------------------------------
-- 18.5 function Condition_Expression
------------------------------------------------------------------------------
function Condition_Expression
(Path : Asis.Path)
return Asis.Expression;
------------------------------------------------------------------------------
-- Path - Specifies the execution path to query
--
-- Returns the condition expression for an IF path or an ELSIF statement or
-- expression path.
--
-- Appropriate Path_Kinds:
-- An_If_Path
-- An_Elsif_Path
-- An_If_Expression_Path -- ASIS 2012
-- An_Elsif_Expression_Path -- ASIS 2012
--
-- Returns Element_Kinds:
-- An_Expression
--
------------------------------------------------------------------------------
-- 18.6 function Sequence_Of_Statements
------------------------------------------------------------------------------
function Sequence_Of_Statements
(Path : Asis.Path;
Include_Pragmas : Boolean := False)
return Asis.Statement_List;
------------------------------------------------------------------------------
-- Path - Specifies the execution path to query
-- Include_Pragmas - Specifies whether pragmas are to be returned
--
-- Returns a list of the statements and pragmas from an execution path,
-- in their order of appearance.
--
-- --|A2012 start
-- In case if a sequence_of_Statements in the argument Element contains
-- 'floating' labels (labels that completes sequence_of_statements and that
-- are not attached to any statement in the source code), the result list
-- contains as its last element an implicit A_Null_Statement element these
-- 'floating' labels are attached to. The Enclosing_Element of this implicit
-- A_Null_Statement element is the argument Element.
-- --|A2012 start
--
-- Appropriate Element_Kinds:
-- A_Path
--
-- Returns Element_Kinds:
-- A_Statement
-- A_Pragma
--
------------------------------------------------------------------------------
-- 18.7 function Case_Expression
------------------------------------------------------------------------------
function Case_Expression
(Statement : Asis.Statement)
return Asis.Expression;
------------------------------------------------------------------------------
-- Statement - Specifies the case statement to query
--
-- --|A2012 start
--
-- Adapted for Ada 2012:
-- Returns the expression of the case statement or case expression that
-- determines which execution path is taken or which alternative is used to
-- get the value of the expression.
--
-- Appropriate Element_Kinds:
-- A_Statement
-- An_Expression
--
-- Appropriate Statement_Kinds:
-- A_Case_Statement
--
-- Appropriate Expression_Kinds:
-- A_Case_Expression
--
-- Returns Element_Kinds:
-- An_Expression
--
-- --|A2012 end
------------------------------------------------------------------------------
-- 18.8 function Case_Statement_Alternative_Choices
------------------------------------------------------------------------------
function Case_Path_Alternative_Choices
(Path : Asis.Path)
return Asis.Element_List;
function Case_Statement_Alternative_Choices
(Path : Asis.Path)
return Asis.Element_List renames Case_Path_Alternative_Choices;
------------------------------------------------------------------------------
-- Path - Specifies the case alternative execution path to query
--
-- Returns a list of the 'when <choice> | <choice>' elements, in their
-- order of appearance.
--
-- Appropriate Path_Kinds:
-- A_Case_Path
-- A_Case_Expression_Path
--
-- Returns Element_Kinds:
-- An_Expression
-- A_Definition
--
-- Returns Definition_Kinds:
-- A_Discrete_Range
-- An_Others_Choice
--
------------------------------------------------------------------------------
-- 18.9 function Statement_Identifier
------------------------------------------------------------------------------
function Statement_Identifier
(Statement : Asis.Statement)
return Asis.Defining_Name;
------------------------------------------------------------------------------
-- Statement - Specifies the statement to query
--
-- Returns the identifier for the loop_statement or block_statement.
--
-- Returns a Nil_Element if the loop has no identifier.
--
-- The Enclosing_Element of the name is the statement.
--
-- Appropriate Statement_Kinds:
-- A_Loop_Statement
-- A_While_Loop_Statement
-- A_For_Loop_Statement
-- A_Block_Statement
--
-- Returns Defining_Name_Kinds:
-- Not_A_Defining_Name
-- A_Defining_Identifier
--
------------------------------------------------------------------------------
-- 18.10 function Is_Name_Repeated
------------------------------------------------------------------------------
function Is_Name_Repeated (Statement : Asis.Statement) return Boolean;
------------------------------------------------------------------------------
-- Statement - Specifies the statement to query
--
-- Returns True if the name of the accept, loop, or block is repeated after
-- the end of the statement. Always returns True for loop or block
-- statements since the name is required.
--
-- Returns False for any unexpected Element.
--
-- Expected Statement_Kinds:
-- A_Block_Statement
-- A_Loop_Statement
-- An_Accept_Statement
--
------------------------------------------------------------------------------
-- 18.11 function While_Condition
------------------------------------------------------------------------------
function While_Condition
(Statement : Asis.Statement)
return Asis.Expression;
------------------------------------------------------------------------------
-- Statement - Specifies the loop statement to query
--
-- Returns the condition expression associated with the while loop.
--
-- Appropriate Element_Kinds:
-- A_Statement
--
-- Appropriate Statement_Kinds:
-- A_While_Loop_Statement
--
-- Returns Element_Kinds:
-- An_Expression
--
------------------------------------------------------------------------------
-- 18.12 function For_Loop_Parameter_Specification
------------------------------------------------------------------------------
function For_Loop_Parameter_Specification
(Statement : Asis.Statement)
return Asis.Declaration;
------------------------------------------------------------------------------
-- Statement - Specifies the loop statement to query
--
-- Returns the declaration of the A_Loop_Parameter_Specification.
--
-- Appropriate Statement_Kinds:
-- A_For_Loop_Statement
--
-- Returns Declaration_Kinds:
-- A_Loop_Parameter_Specification
--
------------------------------------------------------------------------------
-- 18.13 function Loop_Statements
------------------------------------------------------------------------------
function Loop_Statements
(Statement : Asis.Statement;
Include_Pragmas : Boolean := False)
return Asis.Statement_List;
------------------------------------------------------------------------------
-- Statement - Specifies the loop statement to query
-- Include_Pragmas - Specifies whether pragmas are to be returned
--
-- Returns the sequence_of_statements and any pragmas from the loop_statement,
-- in their order of appearance.
--
-- --|A2012 start
-- In case if a sequence_of_Statements in the argument Element contains
-- 'floating' labels (labels that completes sequence_of_statements and that
-- are not attached to any statement in the source code), the result list
-- contains as its last element an implicit A_Null_Statement element these
-- 'floating' labels are attached to. The Enclosing_Element of this implicit
-- A_Null_Statement element is the argument Element.
-- --|A2012 start
--
-- Appropriate Statement_Kinds:
-- A_Loop_Statement
-- A_While_Loop_Statement
-- A_For_Loop_Statement
--
-- Returns Element_Kinds:
-- A_Pragma
-- A_Statement
--
------------------------------------------------------------------------------
-- 18.14 function Is_Declare_Block
------------------------------------------------------------------------------
function Is_Declare_Block (Statement : Asis.Statement) return Boolean;
------------------------------------------------------------------------------
-- Statement - Specifies the statement to query
--
-- Returns True if the statement is a block_statement and it was created with
-- the use of the "declare" reserved word. The presence or absence of any
-- declarative_item elements is not relevant.
--
-- Returns False if the "declare" reserved word does not appear in the
-- block_statement, or for any unexpected Element.
--
-- Expected Statement_Kinds:
-- A_Block_Statement
--
------------------------------------------------------------------------------
-- 18.15 function Block_Declarative_Items
------------------------------------------------------------------------------
function Block_Declarative_Items
(Statement : Asis.Statement;
Include_Pragmas : Boolean := False)
return Asis.Declarative_Item_List;
------------------------------------------------------------------------------
-- Statement - Specifies the block statement to query
-- Include_Pragmas - Specifies whether pragmas are to be returned
--
-- Returns a list of the declarations, representation_clause elements,
-- pragmas, and use_clause elements in the declarative_part of the
-- block_statement, in their order of appearance.
--
-- Returns a Nil_Element_List if there are no declarative items.
--
-- Appropriate Statement_Kinds:
-- A_Block_Statement
--
-- Returns Element_Kinds:
-- A_Declaration
-- A_Pragma
-- A_Clause
--
------------------------------------------------------------------------------
-- 18.16 function Block_Statements
------------------------------------------------------------------------------
function Block_Statements
(Statement : Asis.Statement;
Include_Pragmas : Boolean := False)
return Asis.Statement_List;
------------------------------------------------------------------------------
-- Statement - Specifies the block statement to query
-- Include_Pragmas - Specifies whether pragmas are to be returned
--
-- Returns a list of the statements and pragmas for the block_statement, in
-- their order of appearance.
--
-- Returns a Nil_Element_List if there are no statements or pragmas. This
-- can only occur for a block_statement obtained from the obsolescent query
-- Body_Block_Statement when its argument is a package_body
-- that has no sequence_of_statements.
--
-- --|A2012 start
-- In case if a sequence_of_Statements in the argument Element contains
-- 'floating' labels (labels that completes sequence_of_statements and that
-- are not attached to any statement in the source code), the result list
-- contains as its last element an implicit A_Null_Statement element these
-- 'floating' labels are attached to. The Enclosing_Element of this implicit
-- A_Null_Statement element is the argument Element.
-- --|A2012 start
--
-- Appropriate Statement_Kinds:
-- A_Block_Statement
--
-- Returns Element_Kinds:
-- A_Pragma
-- A_Statement
--
------------------------------------------------------------------------------
-- 18.17 function Block_Exception_Handlers
------------------------------------------------------------------------------
function Block_Exception_Handlers
(Statement : Asis.Statement;
Include_Pragmas : Boolean := False)
return Asis.Exception_Handler_List;
------------------------------------------------------------------------------
-- Statement - Specifies the block statement to query
-- Include_Pragmas - Specifies whether pragmas are to be returned
--
-- Returns a list of the exception_handler elements of the block_statement,
-- in their order of appearance.
--
-- The only pragmas returned are those following the reserved word "exception"
-- and preceding the reserved word "when" of first exception handler.
--
-- Returns a Nil_Element_List if there are no exception_handler elements.
--
-- Appropriate Statement_Kinds:
-- A_Block_Statement
--
-- Returns Element_Kinds:
-- An_Exception_Handler
-- A_Pragma
--
------------------------------------------------------------------------------
-- 18.18 function Exit_Loop_Name
------------------------------------------------------------------------------
function Exit_Loop_Name
(Statement : Asis.Statement)
return Asis.Expression;
------------------------------------------------------------------------------
-- Statement - Specifies the exit statement to query
--
-- Returns the name of the exited loop.
--
-- Returns a Nil_Element if no loop name is present.
--
-- Appropriate Statement_Kinds:
-- An_Exit_Statement
--
-- Returns Expression_Kinds:
-- Not_An_Expression
-- An_Identifier
-- A_Selected_Component
--
------------------------------------------------------------------------------
-- 18.19 function Exit_Condition
------------------------------------------------------------------------------
function Exit_Condition
(Statement : Asis.Statement)
return Asis.Expression;
------------------------------------------------------------------------------
-- Statement - Specifies the exit statement to query
--
-- Returns the "when" condition of the exit statement.
--
-- Returns a Nil_Element if no condition is present.
--
-- Appropriate Statement_Kinds:
-- An_Exit_Statement
--
-- Returns Element_Kinds:
-- Not_An_Element
-- An_Expression
--
------------------------------------------------------------------------------
-- 18.20 function Corresponding_Loop_Exited
------------------------------------------------------------------------------
function Corresponding_Loop_Exited
(Statement : Asis.Statement)
return Asis.Statement;
------------------------------------------------------------------------------
-- Statement - Specifies the exit statement to query
--
-- Returns the loop statement exited by the exit statement.
--
-- Appropriate Statement_Kinds:
-- An_Exit_Statement
--
-- Returns Statement_Kinds:
-- A_Loop_Statement
-- A_While_Loop_Statement
-- A_For_Loop_Statement
--
------------------------------------------------------------------------------
-- 18.21 function Return_Expression
------------------------------------------------------------------------------
function Return_Expression
(Statement : Asis.Statement)
return Asis.Expression;
------------------------------------------------------------------------------
-- Statement - Specifies the return statement to query
--
-- Returns the expression in the return statement.
--
-- Returns a Nil_Element if no expression is present.
--
-- Appropriate Statement_Kinds:
-- A_Return_Statement
--
-- Returns Element_Kinds:
-- Not_An_Element
-- An_Expression
--
-- |A2005 start
------------------------------------------------------------------------------
-- 18.#??? function Return_Object_Declaration
------------------------------------------------------------------------------
function Return_Object_Declaration
(Statement : Asis.Statement)
return Asis.Declaration;
------------------------------------------------------------------------------
-- Statement - Specifies the extended return statement to query
--
-- Returns the declaration of the return object.
--
-- Appropriate Statement_Kinds:
-- An_Extended_Return_Statement
--
-- Returns Declaration_Kinds:
-- A_Return_Object_Declaration
--
-- |D2005 end
-- It Ada 95 there was no notion of a return object, and it was quite logical
-- when ASIS returned An_Expression element for A_Return_Statement as a
-- value returned by a return statement. For An_Extended_Return_Statement
-- we do not have any An_Expression element to be returned as a returned
-- value, the only possibility is to return A_Declaration Element representing
-- the declaration of returned object. This corresponds to the semantics
-- of the return statement defined by Ada 2005.
--
-- So the problem is that for two forms of a return statement ASIS 2005
-- provides two different ways of providing information about what is returned
-- by the statement - an expression or a declaration. Moreover, the old
-- Return_Expression query in Ada 2005 does not correspond any more to the
-- (formal) semantic of the return statement.
--
-- I do not know how to improve this situation at the ASIS side. Probably,
-- we need an Application Note discussing this situation
-- |D2005 start
------------------------------------------------------------------------------
-- 18.#??? function Extended_Return_Statements
------------------------------------------------------------------------------
function Extended_Return_Statements
(Statement : Asis.Statement;
Include_Pragmas : Boolean := False)
return Asis.Statement_List;
------------------------------------------------------------------------------
-- Statement - Specifies the extended return statement to query
-- Include_Pragmas - Specifies whether pragmas are to be returned
--
-- Returns a list of the statements and pragmas from the extended return
-- statement, in their order of appearance.
--
-- Returns a Nil_Element_List if the argument extended return statement does
-- not include handled_sequence_of_statements.
--
-- --|A2012 start
-- In case if a sequence_of_Statements in the argument Element contains
-- 'floating' labels (labels that completes sequence_of_statements and that
-- are not attached to any statement in the source code), the result list
-- contains as its last element an implicit A_Null_Statement element these
-- 'floating' labels are attached to. The Enclosing_Element of this implicit
-- A_Null_Statement element is the argument Element.
-- --|A2012 start
--
-- Appropriate Statement_Kinds:
-- An_Extended_Return_Statement
--
-- Returns Element_Kinds:
-- A_Statement
-- A_Pragma
--
------------------------------------------------------------------------------
-- 18.#??? function Extended_Return_Exception_Handlers
------------------------------------------------------------------------------
function Extended_Return_Exception_Handlers
(Statement : Asis.Statement;
Include_Pragmas : Boolean := False)
return Asis.Exception_Handler_List;
------------------------------------------------------------------------------
-- Statement - Specifies the extended return statement to query
-- Include_Pragmas - Specifies whether pragmas are to be returned
--
-- Returns a list of the exception_handler elements of the extended return
-- statement, in their order of appearance.
--
-- The only pragmas returned are those following the reserved word "exception"
-- and preceding the reserved word "when" of first exception handler.
--
-- Returns a Nil_Element_List if there are no exception_handler elements.
--
-- Appropriate Statement_Kinds:
-- An_Extended_Return_Statement
--
-- Returns Element_Kinds:
-- An_Exception_Handler
-- A_Pragma
--
-- |D2005 start
-- These two proposed queries - Extended_Return_Statements and
-- Extended_Return_Exception_Handlers duplicates queries for getting statement
-- lists and exception handlers from block and accept statements. Can we
-- somehow avoid this duplication?
-- Are these query names - Extended_Return_Statements and
-- Extended_Return_Exception_Handlers - really good?
-- |D2005 end
-- |A2005 end
------------------------------------------------------------------------------
-- 18.22 function Goto_Label
------------------------------------------------------------------------------
function Goto_Label
(Statement : Asis.Statement)
return Asis.Expression;
------------------------------------------------------------------------------
-- Statement - Specifies the goto statement to query
--
-- Returns the expression reference for the label, as specified by the goto
-- statement.
--
-- Appropriate Statement_Kinds:
-- A_Goto_Statement
--
-- Returns Expression_Kinds:
-- An_Identifier
--
------------------------------------------------------------------------------
-- 18.23 function Corresponding_Destination_Statement
------------------------------------------------------------------------------
function Corresponding_Destination_Statement
(Statement : Asis.Statement)
return Asis.Statement;
------------------------------------------------------------------------------
-- Statement - Specifies the goto statement to query
--
-- Returns the target statement specified by the goto statement.
--
-- Appropriate Statement_Kinds:
-- A_Goto_Statement
--
-- Returns Element_Kinds:
-- A_Statement
--
-- --|AN Application Note:
-- --|AN
-- --|AN The Reference Manual allows a pragma between a statement and a label
-- --|AN attached to it. If so, when the label is passed as an actual
-- --|AN parameter to this query, the query returns the statement, but not
-- --|AN the label. The only way for an application to know that there are
-- --|AN any pragmas between a statement and its label is to get the spans
-- --|AN of these program elements and analyze the coverspending positions in
-- --|AN the source text.
--
------------------------------------------------------------------------------
-- 18.24 function Called_Name
------------------------------------------------------------------------------
function Called_Name
(Statement : Asis.Statement)
return Asis.Expression;
------------------------------------------------------------------------------
-- Statement - Specifies the procedure call or entry call statement to query
--
-- Returns the name of the called procedure or entry. The name of an entry
-- family takes the form of An_Indexed_Component.
--
-- Appropriate Statement_Kinds:
-- An_Entry_Call_Statement
-- A_Procedure_Call_Statement
--
-- Returns Element_Kinds:
-- An_Expression
--
------------------------------------------------------------------------------
-- 18.25 function Corresponding_Called_Entity
------------------------------------------------------------------------------
function Corresponding_Called_Entity
(Statement : Asis.Statement)
return Asis.Declaration;
------------------------------------------------------------------------------
-- Statement - Specifies the procedure_call_statement or
-- entry_call_statement to query
--
-- Returns the declaration of the procedure or entry denoted by the call.
--
-- Returns a Nil_Element if the:
--
-- - prefix of the call denotes an access to a procedure implicit
-- or explicit dereference,
--
-- - argument is a dispatching call,
--
-- - argument is a call to a dispatching operation of a tagged type which
-- is not statically determined.
--
-- If procedure_prefix denotes an attribute_reference, and if
-- the corresponding attribute is (re)defined by an attribute definition
-- clause, an implementation is encouraged, but not required, to return the
-- definition of the corresponding subprogram whose name is used after "use"
-- in this attribute definition clause. If an implementation cannot return
-- such a subprogram definition, a Nil_Element should be returned. For an
-- attribute reference which is not (re)defined by an attribute definition
-- clause, a Nil_Element should be returned.
--
-- --|D2005 start
-- If the arrument call is located in expanded generic and it is a call to an
-- artificial null procedure used as the default actual for a formal procedure
-- with null default, Nil_Element is returned.
--
-- If the argument call is a dispatching call, Nil_Element should be returned.
-- this is correct, but of no real help for a client. What about adding
-- another semantic query (let's say - Corresponding_Ancestor_Procedure), that
-- in case if the argument Is_Dispatching_Call returns the very beginning of
-- the chain of inherited/overriding procedures that may be called here. This
-- at least would allow a client to get some information about the profile
-- of the called procedure.
--
-- The same problem exists for dynamic calls (when a called subprogram is
-- pointed by an access value. It would be nice to get the called profile.
-- This problem would be solved if we would add
-- Corresponding_Expression_Type_Definition to Asis.Expression - we could
-- apply it to Called_Name.
--
-- The same problems exist for function calls -
-- Asis.Expressions.Corresponding_Called_Function (17.29) just return
-- Nil_Element for dispatching and dynamic calls, but a client may need a
-- profile.
--
-- May be, we need to clarify explicitly, that in case when a called
-- procedure is declared by subprogram instantiation, then
-- Corresponding_Called_Entity returns A_Procedure_Instantiation Element, but
-- not the corresponding expanded A_Procedure_Declaration (the same problem
-- exists for Asis.Expressions.Corresponding_Called_Function (17.29)
-- --|D2005 end
--
-- Appropriate Statement_Kinds:
-- An_Entry_Call_Statement
-- A_Procedure_Call_Statement
--
-- Returns Declaration_Kinds:
-- Not_A_Declaration
-- A_Procedure_Declaration
-- A_Procedure_Body_Declaration
-- A_Procedure_Body_Stub
-- A_Procedure_Renaming_Declaration
-- A_Procedure_Instantiation
-- A_Formal_Procedure_Declaration
-- An_Entry_Declaration
-- A_Generic_Procedure_Declaration
--
-- --|IP Implementation Permissions
-- --|IP
-- --|IP An implementation may choose to return any part of multi-part
-- --|IP declarations and definitions. Multi-part declaration/definitions
-- --|IP can occur for:
-- --|IP
-- --|IP - Subprogram specification in package specification, package body,
-- --|IP and subunits (is separate);
-- --|IP - Entries in package specification, package body, and subunits
-- --|IP (is separate);
-- --|IP - Private type and full type declarations;
-- --|IP - Incomplete type and full type declarations; and
-- --|IP - Deferred constant and full constant declarations.
-- --|IP
-- --|IP No guarantee is made that the element will be the first part or
-- --|IP that the determination will be made due to any visibility rules.
-- --|IP An application should make its own analysis for each case based
-- --|IP on which part is returned.
--
------------------------------------------------------------------------------
-- 18.26 function Call_Statement_Parameters
------------------------------------------------------------------------------
function Call_Statement_Parameters
(Statement : Asis.Statement;
Normalized : Boolean := False)
return Asis.Association_List;
------------------------------------------------------------------------------
-- Statement - Specifies the procedure_call_statement or
-- entry_call_statement to query
-- Normalized - Specifies whether the normalized form is desired
--
-- Returns a list of parameter_association elements of the call.
--
-- Returns a Nil_Element_List if there are no parameter_association elements.
--
-- An unnormalized list contains only explicit associations ordered as they
-- appear in the program text. Each unnormalized association has an optional
-- formal_parameter_selector_name and an explicit_actual_parameter component.
--
-- A normalized list contains artificial associations representing all
-- explicit and default associations. It has a length equal to the number of
-- parameter_specification elements of the formal_part of the
-- parameter_and_result_profile. The order of normalized associations matches
-- the order of parameter_specification elements.
--
-- Each normalized association represents a one on one mapping of a
-- parameter_specification elements to the explicit or default expression.
-- A normalized association has one A_Defining_Name component that denotes the
-- parameter_specification, and one An_Expression component that is either the
-- explicit_actual_parameter or a default_expression.
--
-- If the prefix of the call denotes an access to a procedure implicit or
-- explicit deference, normalized associations are constructed on the basis
-- of the formal_part of the parameter_profile from the corresponding
-- access_to_subprogram definition.
--
-- Returns Nil_Element for normalized associations in the case where
-- the called procedure can be determined only dynamically (dispatching
-- calls). ASIS cannot produce any meaningful result in this case.
--
--
-- The exception ASIS_Inappropriate_Element is raised when the procedure
-- call is an attribute reference and Is_Normalized is True.
--
-- Appropriate Statement_Kinds:
-- An_Entry_Call_Statement
-- A_Procedure_Call_Statement
--
-- Returns Element_Kinds:
-- A_Parameter_Association
--
-- --|IR Implementation Requirements:
-- --|IR
-- --|IR Normalized associations are Is_Normalized and Is_Part_Of_Implicit.
-- --|IR Normalized associations provided by default are
-- --|IR Is_Defaulted_Association. Normalized associations are never
-- --|IR Is_Equal to unnormalized associations.
-- --|IR
-- --|IP Implementation Permissions:
-- --|IP
-- --|IP An implementation may choose to always include default parameters in
-- --|IP its internal representation.
-- --|IP
-- --|IP An implementation may also choose to normalize its representation
-- --|IP to use defining_identifier elements rather than
-- --|IP formal_parameter_selector_name elements.
-- --|IP
-- --|IP In either case, this query will return Is_Normalized associations
-- --|IP even if Normalized is False, and the query
-- --|IP Call_Statement_Parameters_Normalized will return True.
--
------------------------------------------------------------------------------
-- 18.27 function Accept_Entry_Index
------------------------------------------------------------------------------
function Accept_Entry_Index
(Statement : Asis.Statement)
return Asis.Expression;
------------------------------------------------------------------------------
-- Statement - Specifies the accept statement to query
--
-- Returns the entry index expression in the accept statement.
--
-- Returns a Nil_Element if the statement has no explicit entry index,
--
-- Appropriate Statement_Kinds:
-- An_Accept_Statement
--
-- Returns Element_Kinds:
-- Not_An_Element
-- An_Expression
--
------------------------------------------------------------------------------
-- 18.28 function Accept_Entry_Direct_Name
------------------------------------------------------------------------------
function Accept_Entry_Direct_Name
(Statement : Asis.Statement)
return Asis.Name;
------------------------------------------------------------------------------
-- Statement - Specifies the accept statement to query
--
-- Returns the direct name of the entry. The name follows the reserved word
-- "accept".
--
-- Appropriate Statement_Kinds:
-- An_Accept_Statement
--
-- Returns Expression_Kinds:
-- An_Identifier
--
------------------------------------------------------------------------------
-- 18.29 function Accept_Parameters
------------------------------------------------------------------------------
function Accept_Parameters
(Statement : Asis.Statement)
return Asis.Parameter_Specification_List;
------------------------------------------------------------------------------
-- Statement - Specifies the accept statement to query
--
-- Returns a list of parameter specifications in the formal part of the accept
-- statement, in their order of appearance.
--
-- Returns a Nil_Element_List if the accept_statement has no parameters.
--
-- Results of this query may vary across ASIS implementations. Some
-- implementations normalize all multiple name parameter specifications into
-- an equivalent sequence of corresponding single name parameter
-- specifications. See Reference Manual 3.3.1(7).
--
-- Appropriate Statement_Kinds:
-- An_Accept_Statement
--
-- Returns Declaration_Kinds:
-- A_Parameter_Specification
--
------------------------------------------------------------------------------
-- 18.30 function Accept_Body_Statements
------------------------------------------------------------------------------
function Accept_Body_Statements
(Statement : Asis.Statement;
Include_Pragmas : Boolean := False)
return Asis.Statement_List;
------------------------------------------------------------------------------
-- Statement - Specifies the accept statement to query
-- Include_Pragmas - Specifies whether pragmas are to be returned
--
-- Returns the list of statements and pragmas from the body of the accept
-- statement, in their order of appearance.
--
-- --|A2012 start
-- In case if a sequence_of_Statements in the argument Element contains
-- 'floating' labels (labels that completes sequence_of_statements and that
-- are not attached to any statement in the source code), the result list
-- contains as its last element an implicit A_Null_Statement element these
-- 'floating' labels are attached to. The Enclosing_Element of this implicit
-- A_Null_Statement element is the argument Element.
-- --|A2012 start
--
-- Appropriate Statement_Kinds:
-- An_Accept_Statement
--
-- Returns Element_Kinds:
-- A_Pragma
-- A_Statement
--
------------------------------------------------------------------------------
-- 18.31 function Accept_Body_Exception_Handlers
------------------------------------------------------------------------------
function Accept_Body_Exception_Handlers
(Statement : Asis.Statement;
Include_Pragmas : Boolean := False)
return Asis.Statement_List;
------------------------------------------------------------------------------
-- Statement - Specifies the accept statement to query
-- Include_Pragmas - Specifies whether pragmas are to be returned
--
-- Returns the list of exception handlers and pragmas from the body of the
-- accept statement, in their order of appearance.
--
-- Appropriate Statement_Kinds:
-- An_Accept_Statement
--
-- Returns Element_Kinds:
-- A_Pragma
-- An_Exception_Handler
--
------------------------------------------------------------------------------
-- 18.32 function Corresponding_Entry
------------------------------------------------------------------------------
function Corresponding_Entry
(Statement : Asis.Statement)
return Asis.Declaration;
------------------------------------------------------------------------------
-- Statement - Specifies the accept statement to query
--
-- Returns the declaration of the entry accepted in this statement.
--
-- Appropriate Statement_Kinds:
-- An_Accept_Statement
--
-- Returns Declaration_Kinds:
-- An_Entry_Declaration
--
------------------------------------------------------------------------------
-- 18.33 function Requeue_Entry_Name
------------------------------------------------------------------------------
function Requeue_Entry_Name
(Statement : Asis.Statement)
return Asis.Name;
------------------------------------------------------------------------------
-- Statement - Specifies the requeue statement to query
--
-- Returns the entry name following the reserved word "accept". The name of
-- an entry family takes the form of An_Indexed_Component.
--
-- Appropriate Statement_Kinds:
-- A_Requeue_Statement
-- A_Requeue_Statement_With_Abort
--
-- Returns Element_Kinds:
-- An_Expression
--
------------------------------------------------------------------------------
-- 18.34 function Delay_Expression
------------------------------------------------------------------------------
function Delay_Expression
(Statement : Asis.Statement)
return Asis.Expression;
------------------------------------------------------------------------------
-- Statement - Specifies the delay statement to query
--
-- Returns the expression for the duration of the delay.
--
-- Appropriate Statement_Kinds:
-- A_Delay_Until_Statement
-- A_Delay_Relative_Statement
--
-- Returns Element_Kinds:
-- An_Expression
--
------------------------------------------------------------------------------
-- 18.35 function Guard
------------------------------------------------------------------------------
function Guard (Path : Asis.Path) return Asis.Expression;
------------------------------------------------------------------------------
-- Path - Specifies the select statement execution path to query
--
-- Returns the conditional expression guard for the path.
--
-- Returns a Nil_Element if there is no guard, or if the path is from a
-- timed_entry_call, a conditional_entry_call, or an asynchronous_select
-- statement where a guard is not legal.
--
-- Appropriate Path_Kinds:
-- A_Select_Path
-- An_Or_Path
--
-- Returns Element_Kinds:
-- Not_An_Element
-- An_Expression
--
------------------------------------------------------------------------------
-- 18.36 function Aborted_Tasks
------------------------------------------------------------------------------
function Aborted_Tasks
(Statement : Asis.Statement)
return Asis.Expression_List;
------------------------------------------------------------------------------
-- Statement - Specifies the abort statement to query
--
-- Returns a list of the task names from the ABORT statement, in their order
-- of appearance.
--
-- Appropriate Statement_Kinds:
-- An_Abort_Statement
--
-- Returns Element_Kinds:
-- An_Expression
--
------------------------------------------------------------------------------
-- 18.37 function Choice_Parameter_Specification
------------------------------------------------------------------------------
function Choice_Parameter_Specification
(Handler : Asis.Exception_Handler)
return Asis.Declaration;
------------------------------------------------------------------------------
-- Handler - Specifies the exception handler to query
--
-- Returns the choice parameter specification following the reserved word
-- "when" in the exception handler.
--
-- Returns a Nil_Element if there is no explicit choice parameter.
--
-- Appropriate Element_Kinds:
-- An_Exception_Handler
--
-- Returns Declaration_Kinds:
-- Not_A_Declaration
-- A_Choice_Parameter_Specification
--
------------------------------------------------------------------------------
-- 18.38 function Exception_Choices
------------------------------------------------------------------------------
function Exception_Choices
(Handler : Asis.Exception_Handler)
return Asis.Element_List;
------------------------------------------------------------------------------
-- Handler - Specifies the exception handler to query
--
-- Returns a list of the 'when <choice> | <choice>' elements, in their
-- order of appearance. Choices are either the exception name expression or
-- an others choice.
--
-- Appropriate Element_Kinds:
-- An_Exception_Handler
--
-- Returns Expression_Kinds:
-- An_Identifier
-- A_Selected_Component
--
-- Returns Definition_Kinds:
-- An_Others_Choice
--
------------------------------------------------------------------------------
-- 18.39 function Handler_Statements
------------------------------------------------------------------------------
function Handler_Statements
(Handler : Asis.Exception_Handler;
Include_Pragmas : Boolean := False)
return Asis.Statement_List;
------------------------------------------------------------------------------
-- Handler - Specifies the exception handler to query
-- Include_Pragmas - Specifies whether pragmas are to be returned
--
-- Returns the list of statements and pragmas from the body of the
-- exception handler, in their order of appearance.
--
-- --|A2012 start
-- In case if a sequence_of_Statements in the argument Element contains
-- 'floating' labels (labels that completes sequence_of_statements and that
-- are not attached to any statement in the source code), the result list
-- contains as its last element an implicit A_Null_Statement element these
-- 'floating' labels are attached to. The Enclosing_Element of this implicit
-- A_Null_Statement element is the argument Element.
-- --|A2012 start
--
-- Appropriate Element_Kinds:
-- An_Exception_Handler
--
-- Returns Element_Kinds:
-- A_Pragma
-- A_Statement
--
------------------------------------------------------------------------------
-- 18.40 function Raised_Exception
------------------------------------------------------------------------------
function Raised_Exception
(Statement : Asis.Statement)
return Asis.Expression;
------------------------------------------------------------------------------
-- Statement - Specifies the raise statement to query
--
-- Returns the expression that names the raised exception.
--
-- Returns a Nil_Element if there is no explicitly named exception.
--
-- Appropriate Statement_Kinds:
-- A_Raise_Statement
--
-- Appropriate Expression_Kinds:
-- A_Raise_Expression
--
-- Returns Expression_Kinds:
-- Not_An_Expression
-- An_Identifier
-- A_Selected_Component
--
------------------------------------------------------------------------------
-- |A2005 start
-- 18.40 function
------------------------------------------------------------------------------
function Associated_Message
(Statement : Asis.Statement)
return Asis.Expression;
------------------------------------------------------------------------------
-- Statement - Specifies the raise statement to query
--
-- Returns the string expression that is associated with the raised
-- exception and follows the WITH keyword in the raise statement
--
-- Returns a Nil_Element if there is no string expression.
--
-- Appropriate Statement_Kinds:
-- A_Raise_Statement
--
-- Appropriate Expression_Kinds:
-- A_Raise_Expression
--
-- Returns Element_Kinds:
-- Not_An_Element
-- An_Expression
--
-- |A2005 end
------------------------------------------------------------------------------
-- 18.41 function Qualified_Expression
------------------------------------------------------------------------------
function Qualified_Expression
(Statement : Asis.Statement)
return Asis.Expression;
------------------------------------------------------------------------------
-- Statement - Specifies the code statement to query
--
-- Returns the qualified aggregate expression representing the code statement.
--
-- Appropriate Statement_Kinds:
-- A_Code_Statement
--
-- Returns Expression_Kinds:
-- A_Qualified_Expression
--
------------------------------------------------------------------------------
-- 18.42 function Is_Dispatching_Call
------------------------------------------------------------------------------
function Is_Dispatching_Call (Call : Asis.Element) return Boolean;
------------------------------------------------------------------------------
-- Call - Specifies the element to query.
--
-- Returns True if the controlling tag of Call is dynamically determined.
--
-- This function shall always return False when pragma
-- Restrictions (No_Dispatch) applies.
--
-- Returns False for any unexpected Element.
--
-- Expected Element_Kinds:
-- A_Function_Call
-- A_Procedure_Call_Statement
--
------------------------------------------------------------------------------
-- 18.43 function Is_Call_On_Dispatching_Operation
------------------------------------------------------------------------------
function Is_Call_On_Dispatching_Operation
(Call : Asis.Element)
return Boolean;
------------------------------------------------------------------------------
-- Call - Specifies the element to query.
--
-- Returns True if the name or prefix of Call denotes the declaration of a
-- primitive operation of a tagged type.
--
-- Returns False for any unexpected Element.
--
-- Expected Element_Kinds:
-- A_Function_Call
-- A_Procedure_Call_Statement
--
------------------------------------------------------------------------------
end Asis.Statements;
|