Mercurial > hg > CbC > CbC_gcc
diff gcc/ada/libgnat/s-stalib.ads @ 111:04ced10e8804
gcc 7
author | kono |
---|---|
date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | |
children | 84e7813d76e9 |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gcc/ada/libgnat/s-stalib.ads Fri Oct 27 22:46:09 2017 +0900 @@ -0,0 +1,263 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- S Y S T E M . S T A N D A R D _ L I B R A R Y -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 1992-2017, 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. -- +-- -- +-- As a special exception under Section 7 of GPL version 3, you are granted -- +-- additional permissions described in the GCC Runtime Library Exception, -- +-- version 3.1, as published by the Free Software Foundation. -- +-- -- +-- 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/>. -- +-- -- +-- GNAT was originally developed by the GNAT team at New York University. -- +-- Extensive contributions were provided by Ada Core Technologies Inc. -- +-- -- +------------------------------------------------------------------------------ + +-- This package is included in all programs. It contains declarations that +-- are required to be part of every Ada program. A special mechanism is +-- required to ensure that these are loaded, since it may be the case in +-- some programs that the only references to these required packages are +-- from C code or from code generated directly by Gigi, and in both cases +-- the binder is not aware of such references. + +-- System.Standard_Library also includes data that must be present in every +-- program, in particular data for all the standard exceptions, and also some +-- subprograms that must be present in every program. + +-- The binder unconditionally includes s-stalib.ali, which ensures that this +-- package and the packages it references are included in all Ada programs, +-- together with the included data. + +pragma Compiler_Unit_Warning; + +pragma Polling (Off); +-- We must turn polling off for this unit, because otherwise we get +-- elaboration circularities with Ada.Exceptions if polling is on. + +with Ada.Unchecked_Conversion; + +package System.Standard_Library is + + -- Historical note: pragma Preelaborate was surrounded by a pair of pragma + -- Warnings (Off/On) to circumvent a bootstrap issue. + + pragma Preelaborate; + + subtype Big_String is String (1 .. Positive'Last); + pragma Suppress_Initialization (Big_String); + -- Type used to obtain string access to given address. Initialization is + -- suppressed, since we never want to have variables of this type, and + -- we never want to attempt initialiazation of virtual variables of this + -- type (e.g. when pragma Normalize_Scalars is used). + + type Big_String_Ptr is access all Big_String; + for Big_String_Ptr'Storage_Size use 0; + -- We use this access type to pass a pointer to an area of storage to be + -- accessed as a string. Of course when this pointer is used, it is the + -- responsibility of the accessor to ensure proper bounds. The storage + -- size clause ensures we do not allocate variables of this type. + + function To_Ptr is + new Ada.Unchecked_Conversion (System.Address, Big_String_Ptr); + + ------------------------------------- + -- Exception Declarations and Data -- + ------------------------------------- + + type Raise_Action is access procedure; + -- A pointer to a procedure used in the Raise_Hook field + + type Exception_Data; + type Exception_Data_Ptr is access all Exception_Data; + -- An equivalent of Exception_Id that is public + + -- The following record defines the underlying representation of exceptions + + -- WARNING: Any changes to this may need to be reflected in the following + -- locations in the compiler and runtime code: + + -- 1. The Internal_Exception routine in s-exctab.adb + -- 2. The processing in gigi that tests Not_Handled_By_Others + -- 3. Expand_N_Exception_Declaration in Exp_Ch11 + -- 4. The construction of the exception type in Cstand + + type Exception_Data is record + Not_Handled_By_Others : Boolean; + -- Normally set False, indicating that the exception is handled in the + -- usual way by others (i.e. an others handler handles the exception). + -- Set True to indicate that this exception is not caught by others + -- handlers, but must be explicitly named in a handler. This latter + -- setting is currently used by the Abort_Signal. + + Lang : Character; + -- A character indicating the language raising the exception. + -- Set to "A" for exceptions defined by an Ada program. + -- Set to "C" for imported C++ exceptions. + + Name_Length : Natural; + -- Length of fully expanded name of exception + + Full_Name : System.Address; + -- Fully expanded name of exception, null terminated + -- You can use To_Ptr to convert this to a string. + + HTable_Ptr : Exception_Data_Ptr; + -- Hash table pointer used to link entries together in the hash table + -- built (by Register_Exception in s-exctab.adb) for converting between + -- identities and names. + + Foreign_Data : Address; + -- Data for imported exceptions. Not used in the Ada case. This + -- represents the address of the RTTI for the C++ case. + + Raise_Hook : Raise_Action; + -- This field can be used to place a "hook" on an exception. If the + -- value is non-null, then it points to a procedure which is called + -- whenever the exception is raised. This call occurs immediately, + -- before any other actions taken by the raise (and in particular + -- before any unwinding of the stack occurs). + end record; + + -- Definitions for standard predefined exceptions defined in Standard, + + -- Why are the NULs necessary here, seems like they should not be + -- required, since Gigi is supposed to add a Nul to each name ??? + + Constraint_Error_Name : constant String := "CONSTRAINT_ERROR" & ASCII.NUL; + Program_Error_Name : constant String := "PROGRAM_ERROR" & ASCII.NUL; + Storage_Error_Name : constant String := "STORAGE_ERROR" & ASCII.NUL; + Tasking_Error_Name : constant String := "TASKING_ERROR" & ASCII.NUL; + Abort_Signal_Name : constant String := "_ABORT_SIGNAL" & ASCII.NUL; + + Numeric_Error_Name : constant String := "NUMERIC_ERROR" & ASCII.NUL; + -- This is used only in the Ada 83 case, but it is not worth having a + -- separate version of s-stalib.ads for use in Ada 83 mode. + + Constraint_Error_Def : aliased Exception_Data := + (Not_Handled_By_Others => False, + Lang => 'A', + Name_Length => Constraint_Error_Name'Length, + Full_Name => Constraint_Error_Name'Address, + HTable_Ptr => null, + Foreign_Data => Null_Address, + Raise_Hook => null); + + Numeric_Error_Def : aliased Exception_Data := + (Not_Handled_By_Others => False, + Lang => 'A', + Name_Length => Numeric_Error_Name'Length, + Full_Name => Numeric_Error_Name'Address, + HTable_Ptr => null, + Foreign_Data => Null_Address, + Raise_Hook => null); + + Program_Error_Def : aliased Exception_Data := + (Not_Handled_By_Others => False, + Lang => 'A', + Name_Length => Program_Error_Name'Length, + Full_Name => Program_Error_Name'Address, + HTable_Ptr => null, + Foreign_Data => Null_Address, + Raise_Hook => null); + + Storage_Error_Def : aliased Exception_Data := + (Not_Handled_By_Others => False, + Lang => 'A', + Name_Length => Storage_Error_Name'Length, + Full_Name => Storage_Error_Name'Address, + HTable_Ptr => null, + Foreign_Data => Null_Address, + Raise_Hook => null); + + Tasking_Error_Def : aliased Exception_Data := + (Not_Handled_By_Others => False, + Lang => 'A', + Name_Length => Tasking_Error_Name'Length, + Full_Name => Tasking_Error_Name'Address, + HTable_Ptr => null, + Foreign_Data => Null_Address, + Raise_Hook => null); + + Abort_Signal_Def : aliased Exception_Data := + (Not_Handled_By_Others => True, + Lang => 'A', + Name_Length => Abort_Signal_Name'Length, + Full_Name => Abort_Signal_Name'Address, + HTable_Ptr => null, + Foreign_Data => Null_Address, + Raise_Hook => null); + + pragma Export (C, Constraint_Error_Def, "constraint_error"); + pragma Export (C, Numeric_Error_Def, "numeric_error"); + pragma Export (C, Program_Error_Def, "program_error"); + pragma Export (C, Storage_Error_Def, "storage_error"); + pragma Export (C, Tasking_Error_Def, "tasking_error"); + pragma Export (C, Abort_Signal_Def, "_abort_signal"); + + Local_Partition_ID : Natural := 0; + -- This variable contains the local Partition_ID that will be used when + -- building exception occurrences. In distributed mode, it will be + -- set by each partition to the correct value during the elaboration. + + type Exception_Trace_Kind is + (RM_Convention, + -- No particular trace is requested, only unhandled exceptions + -- in the environment task (following the RM) will be printed. + -- This is the default behavior. + + Every_Raise, + -- Denotes the initial raise event for any exception occurrence, either + -- explicit or due to a specific language rule, within the context of a + -- task or not. + + Unhandled_Raise, + -- Denotes the raise events corresponding to exceptions for which there + -- is no user defined handler. This includes unhandled exceptions in + -- task bodies. + + Unhandled_Raise_In_Main + -- Same as Unhandled_Raise, except exceptions in task bodies are not + -- included. Same as RM_Convention, except (1) the message is printed as + -- soon as the environment task completes due to an unhandled exception + -- (before awaiting the termination of dependent tasks, and before + -- library-level finalization), and (2) a symbolic traceback is given + -- if possible. This is the default behavior if the binder switch -E is + -- used. + ); + -- Provide a way to denote different kinds of automatic traces related + -- to exceptions that can be requested. + + Exception_Trace : Exception_Trace_Kind := RM_Convention; + pragma Atomic (Exception_Trace); + -- By default, follow the RM convention + + ----------------- + -- Subprograms -- + ----------------- + + procedure Abort_Undefer_Direct; + pragma Inline (Abort_Undefer_Direct); + -- A little procedure that just calls Abort_Undefer.all, for use in + -- clean up procedures, which only permit a simple subprogram name. + + procedure Adafinal; + -- Performs the Ada Runtime finalization the first time it is invoked. + -- All subsequent calls are ignored. + +end System.Standard_Library;