+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT RUN-TIME COMPONENTS --
--- --
--- S Y S T E M . M E M O R Y --
--- --
--- S p e c --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- Copyright (C) 2001 Free Software Foundation, Inc. --
--- --
--- This specification is derived from the Ada Reference Manual for use with --
--- GNAT. The copyright notice above, and the license provisions that follow --
--- apply solely to the contents of the part following the private keyword. --
--- --
--- 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 2, 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 COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- This is the default implementation of this package.
-
--- This implementation assumes that the underlying malloc/free/realloc
--- implementation is thread safe, and thus, no additional lock is required.
--- Note that we still need to defer abortion because on most systems,
--- an asynchronous signal (as used for implementing asynchronous abortion
--- of task) cannot safely be handled while malloc is executing.
-
--- If you are not using Ada constructs containing the "abort" keyword,
--- then you can remove the calls to Abort_Defer.all and Abort_Undefer.all
--- from this unit.
-
-with Ada.Exceptions;
-with System.Soft_Links;
-
-package body System.Memory is
-
- use Ada.Exceptions;
- use System.Soft_Links;
-
- function c_malloc (Size : size_t) return System.Address;
- pragma Import (C, c_malloc, "malloc");
-
- procedure c_free (Ptr : System.Address);
- pragma Import (C, c_free, "free");
-
- function c_realloc
- (Ptr : System.Address; Size : size_t) return System.Address;
- pragma Import (C, c_realloc, "realloc");
-
- -----------
- -- Alloc --
- -----------
-
- function Alloc (Size : size_t) return System.Address is
- Result : System.Address;
- Actual_Size : size_t := Size;
-
- begin
- if Size = size_t'Last then
- Raise_Exception (Storage_Error'Identity, "object too large");
- end if;
-
- -- Change size from zero to non-zero. We still want a proper pointer
- -- for the zero case because pointers to zero length objects have to
- -- be distinct, but we can't just go ahead and allocate zero bytes,
- -- since some malloc's return zero for a zero argument.
-
- if Size = 0 then
- Actual_Size := 1;
- end if;
-
- Abort_Defer.all;
- Result := c_malloc (Actual_Size);
- Abort_Undefer.all;
-
- if Result = System.Null_Address then
- Raise_Exception (Storage_Error'Identity, "heap exhausted");
- end if;
-
- return Result;
- end Alloc;
-
- ----------
- -- Free --
- ----------
-
- procedure Free (Ptr : System.Address) is
- begin
- Abort_Defer.all;
- c_free (Ptr);
- Abort_Undefer.all;
- end Free;
-
- -------------
- -- Realloc --
- -------------
-
- function Realloc
- (Ptr : System.Address;
- Size : size_t)
- return System.Address
- is
- Result : System.Address;
- Actual_Size : size_t := Size;
-
- begin
- if Size = size_t'Last then
- Raise_Exception (Storage_Error'Identity, "object too large");
- end if;
-
- Abort_Defer.all;
- Result := c_realloc (Ptr, Actual_Size);
- Abort_Undefer.all;
-
- if Result = System.Null_Address then
- Raise_Exception (Storage_Error'Identity, "heap exhausted");
- end if;
-
- return Result;
- end Realloc;
-
-end System.Memory;
projects / msp430-gcc.git / blobdiff