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Diffstat (limited to 'gcc-4.8.3/gcc/ada/sem_dim.ads')
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diff --git a/gcc-4.8.3/gcc/ada/sem_dim.ads b/gcc-4.8.3/gcc/ada/sem_dim.ads new file mode 100644 index 000000000..2fdfd30ee --- /dev/null +++ b/gcc-4.8.3/gcc/ada/sem_dim.ads @@ -0,0 +1,194 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- S E M _ D I M -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 2011-2012, 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 package provides support for numerical systems with dimensions. A +-- "dimension" is a compile-time property of a numerical type which represents +-- a relation between various quantifiers such as length, velocity, etc. + +-- Package System.Dim.Mks offers a ready-to-use system of SI base units. In +-- addition, the implementation of this feature offers the ability to define +-- an arbitrary system of units through the use of Ada 2012 aspects. + +-- Dimensionality checking is part of type analysis performed by the compiler. +-- It ensures that manipulation of quantified numeric values is sensible with +-- respect to the system of units. + +----------------------------- +-- Aspect_Dimension_System -- +----------------------------- + +-- In order to enable the user to create their own dimension system, a new +-- aspect: Aspect_Dimension_System has been created. + +-- Note that this aspect applies for type declaration of type derived from any +-- numeric type. + +-- It defines the names of each dimension + +---------------------- +-- Aspect_Dimension -- +---------------------- + +-- This new aspect applies for subtype and object declarations in order to +-- define new dimensions. + +-- Using this aspect, the user is able to create new subtype/object with any +-- dimension needed. + +-- Note that the base type of the subtype/object must be the type that defines +-- the corresponding dimension system. + +-- The expression of this aspect is an aggregate of rational values for each +-- dimension in the corresponding dimension system. + +------------------------------------------- +-- Dimensionality checking & propagation -- +------------------------------------------- + +-- For each node (when needed), a dimension analysis (Analyze_Dimension) is +-- performed as part of the Resolution routine or the Analysis routine if no +-- Resolution. + +-- The dimension analysis is divided into two phases: + +-- Phase 1: dimension checking + +-- Phase 2: propagation of dimensions + +-- Depending on the node kind, either none, one phase or two phases are +-- executed. + +-- Phase 2 is called only when the node allows a dimension (see body of +-- Sem_Dim to get the list of nodes that permit dimensions). + +with Types; use Types; + +package Sem_Dim is + + procedure Analyze_Aspect_Dimension + (N : Node_Id; + Id : Entity_Id; + Aggr : Node_Id); + -- Analyze the contents of aspect Dimension. Associate the provided values + -- and quantifiers with the related context N. Id is the corresponding + -- Aspect_Id (Aspect_Dimension) Aggr is the corresponding expression for + -- the aspect Dimension declared by the declaration of N. + + procedure Analyze_Aspect_Dimension_System + (N : Node_Id; + Id : Entity_Id; + Aggr : Node_Id); + -- Analyze the contents of aspect Dimension_System. Extract the numerical + -- type, unit name and corresponding symbol from each indivitual dimension. + -- Id is the corresponding Aspect_Id (Aspect_Dimension_System) + -- Aggr is the corresponding expression for the aspect Dimension_System + -- declared by the declaration of N. + + procedure Analyze_Dimension (N : Node_Id); + -- N may denote any of the following contexts: + -- * aggregate + -- * assignment statement + -- * attribute reference + -- * binary operator + -- * call + -- * compontent declaration + -- * extended return statement + -- * expanded name + -- * identifier + -- * indexed component + -- * object declaration + -- * object renaming declaration + -- * procedure call statement + -- * qualified expression + -- * selected component + -- * simple return statement + -- * slice + -- * subtype declaration + -- * type conversion + -- * unary operator + -- * unchecked type conversion + -- Depending on the context, ensure that all expressions and entities + -- involved do not violate the rules of a system. + + procedure Analyze_Dimension_Array_Aggregate + (N : Node_Id; + Comp_Typ : Entity_Id); + -- Check, for each component of the array aggregate denoted by N, the + -- dimensions of the component expression match the dimensions of the + -- component type Comp_Typ. + + procedure Analyze_Dimension_Call (N : Node_Id; Nam : Entity_Id); + -- This routine is split in two steps. Note the second step applies only to + -- function calls. + -- Step 1. Dimension checking: + -- * General case: check the dimensions of each actual parameter match + -- the dimensions of the corresponding formal parameter. + -- * Elementary function case: check each actual is dimensionless except + -- for Sqrt call. + -- Step 2. Dimension propagation (only for functions): + -- * General case: propagate the dimensions from the returned type to the + -- function call. + -- * Sqrt case: the resulting dimensions equal to half the dimensions of + -- the actual + + procedure Analyze_Dimension_Extension_Or_Record_Aggregate (N : Node_Id); + -- Check, for each component of the extension or record aggregate denoted + -- by N, the dimensions of the component expression match the dimensions of + -- the component type. + + procedure Analyze_Dimension_Formals (N : Node_Id; Formals : List_Id); + -- For sub spec N, issue a warning for each dimensioned formal with a + -- literal default value in the list of formals Formals. + + procedure Copy_Dimensions (From, To : Node_Id); + -- Copy dimension vector of node From to node To. Note that To must be a + -- node that is allowed to contain a dimension (see OK_For_Dimension in + -- body of Sem_Dim). + + procedure Eval_Op_Expon_For_Dimensioned_Type + (N : Node_Id; + Btyp : Entity_Id); + -- Evaluate the Expon operator for dimensioned type with rational exponent. + -- Indeed the regular Eval_Op_Expon routine (see package Sem_Eval) is + -- restricted to Integer exponent. This routine deals only with rational + -- exponent which is not an integer if Btyp is a dimensioned type. + + procedure Expand_Put_Call_With_Symbol (N : Node_Id); + -- Determine whether N denotes a subprogram call to one of the routines + -- defined in System.Dim.Float_IO or System.Dim.Integer_IO and add an + -- extra actual to the call to represent the symbolic representation of + -- a dimension. + + function Has_Dimension_System (Typ : Entity_Id) return Boolean; + -- Return True if type Typ has aspect Dimension_System applied to it + + function Is_Dim_IO_Package_Instantiation (N : Node_Id) return Boolean; + -- Return True if N is a package instantiation of System.Dim.Integer_IO or + -- of System.Dim.Float_IO. + + procedure Remove_Dimension_In_Statement (Stmt : Node_Id); + -- Remove the dimensions associated with Stmt + +end Sem_Dim; |