------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S E M _ C A T -- -- -- -- S p e c -- -- -- -- Copyright (C) 1992-2010, Free Software Foundation, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 3, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- -- for more details. You should have received a copy of the GNU General -- -- Public License distributed with GNAT; see file COPYING3. If not, go to -- -- http://www.gnu.org/licenses for a complete copy of the license. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- This unit contains the routines used for checking for conformance with -- the semantic restrictions required for the categorization pragmas: -- -- Preelaborate -- Pure, -- Remote_Call_Interface -- Remote_Types -- Shared_Passive -- -- Note that we treat Preelaborate as a categorization pragma, even though -- strictly, according to RM E.2(2,3), the term does not apply in this case. with Exp_Tss; use Exp_Tss; with Types; use Types; package Sem_Cat is function Has_Stream_Attribute_Definition (Typ : Entity_Id; Nam : TSS_Name_Type; At_Any_Place : Boolean := False) return Boolean; -- True when there is a attribute definition clause specifying attribute -- Nam for Typ. In Ada 2005 mode, returns True only when the attribute -- definition clause is visible, unless At_Any_Place is True (in which case -- no visibility test is made, and True is returned as long as an attribute -- is visible at any place). Note that attribute definition clauses -- inherited from parent types are taken into account by this predicate -- (to test for presence of an attribute definition clause for one -- specific type, excluding inherited definitions, the flags -- Has_Specified_Stream_* can be used instead). function In_Preelaborated_Unit return Boolean; -- Determines if the current scope is within a preelaborated compilation -- unit, that is one to which one of the pragmas Preelaborate, Pure, -- Shared_Passive, Remote_Types, or inside a unit other than a package -- body with pragma Remote_Call_Interface. function In_Pure_Unit return Boolean; pragma Inline (In_Pure_Unit); -- Determines if the current scope is within pure compilation unit, -- that is, one to which the pragmas Pure is applied. function In_Subprogram_Task_Protected_Unit return Boolean; -- Determines if the current scope is within a subprogram, task -- or protected unit. Used to validate if the library unit is Pure -- (RM 10.2.1(16)). procedure Set_Categorization_From_Pragmas (N : Node_Id); -- Since validation of categorization dependency is done during Analyze, -- categorization flags from following pragmas should be set before -- validation begin. N is the N_Compilation_Unit node. procedure Set_Categorization_From_Scope (E : Entity_Id; Scop : Entity_Id); -- Set categorization flags Pure, Remote_Call_Interface and Remote_Types -- on entity E according to those of Scop. procedure Validate_Access_Type_Declaration (T : Entity_Id; N : Node_Id); -- Validate all constraints against declaration of access types in -- categorized library units. Usually this is a violation in Pure unit, -- Shared_Passive unit. N is the declaration node. procedure Validate_Ancestor_Part (N : Node_Id); -- Checks that a type given as the ancestor in an extension aggregate -- satisfies the restriction of 10.2.1(9). procedure Validate_Categorization_Dependency (N : Node_Id; E : Entity_Id); -- There are restrictions on lib unit that semantically depends on other -- units (RM E.2(5), 10.2.1(11). This procedure checks the restrictions -- on categorizations. N is the current unit node, and E is the current -- library unit entity. procedure Validate_Controlled_Object (E : Entity_Id); -- Given an entity for a library level controlled object, check that it is -- not in a preelaborated unit (prohibited by RM 10.2.1(9)). procedure Validate_Null_Statement_Sequence (N : Node_Id); -- Given N, a package body node, check that a handled statement sequence -- in a preelaborable body contains no statements other than labels or -- null statements, as required by RM 10.2.1(6). procedure Validate_Object_Declaration (N : Node_Id); -- Given N, an object declaration node, validates all the constraints in -- a preelaborable library unit, including creation of task objects etc. -- Note that this is called when the corresponding object is frozen since -- the checks cannot be made before knowing if the object is imported. procedure Validate_RCI_Declarations (P : Entity_Id); -- Apply semantic checks given in E2.3(10-14) procedure Validate_RCI_Subprogram_Declaration (N : Node_Id); -- Check RCI subprogram declarations for illegal inlining and formals not -- supporting external streaming. procedure Validate_Remote_Access_To_Class_Wide_Type (N : Node_Id); -- Checks that Storage_Pool and Storage_Size attribute references are -- not applied to remote access-to-class-wide types. And the expected -- type for an allocator shall not be a remote access-to-class-wide -- type. And a remote access-to-class-wide type shall not be an actual -- parameter for a generic formal access type. RM E.2.3(22). procedure Validate_RT_RAT_Component (N : Node_Id); -- Given N, the package library unit declaration node, we should check -- against RM:9.95 E.2.2(8): the full view of a type declared in the -- visible part of a Remote Types unit has a part that is of a non-remote -- access type which has no read/write. procedure Validate_Remote_Type_Type_Conversion (N : Node_Id); -- Check for remote-type type conversion constraints. First, a value of -- a remote access-to-subprogram type can be converted only to another -- type conformant remote access-to-subprogram type. Secondly, a value -- of a remote access-to-class-wide type can be converted only to another -- remote access-to-class-wide type (RM E.2.3(17,20)). procedure Validate_SP_Access_Object_Type_Decl (T : Entity_Id); -- Check validity of declaration if shared passive unit. It should not -- contain the declaration of an access-to-object type whose designated -- type is a class-wide type ,task type or protected type. E.2.1(7). -- T is the entity of the declared type. procedure Validate_Static_Object_Name (N : Node_Id); -- In the elaboration code of a preelaborated library unit, check that we -- do not have the evaluation of a primary that is a name of an object, -- unless the name is a static expression (RM 10.2.1(8)). Non-static -- constant and variable are the targets, generic parameters are not -- are not included because the generic declaration and body are -- preelaborable. procedure Validate_RACW_Primitives (T : Entity_Id); -- Enforce constraints on primitive operations of the designated type of -- an RACW. Note that since the complete set of primitive operations of the -- designated type needs to be known, we must defer these checks until the -- designated type is frozen. end Sem_Cat;