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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [ada/] [s-memory.adb] - Blame information for rev 281

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1 281 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT RUN-TIME COMPONENTS                         --
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--                                                                          --
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--                         S Y S T E M . M E M O R Y                        --
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--                                                                          --
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--                                 B o d y                                  --
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--                                                                          --
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--          Copyright (C) 2001-2009, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This is the default implementation of this package
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--  This implementation assumes that the underlying malloc/free/realloc
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--  implementation is thread safe, and thus, no additional lock is required.
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--  Note that we still need to defer abort because on most systems, an
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--  asynchronous signal (as used for implementing asynchronous abort of
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--  task) cannot safely be handled while malloc is executing.
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--  If you are not using Ada constructs containing the "abort" keyword, then
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--  you can remove the calls to Abort_Defer.all and Abort_Undefer.all from
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--  this unit.
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pragma Compiler_Unit;
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with Ada.Exceptions;
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with System.Soft_Links;
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with System.Parameters;
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with System.CRTL;
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package body System.Memory is
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   use Ada.Exceptions;
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   use System.Soft_Links;
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   function c_malloc (Size : System.CRTL.size_t) return System.Address
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    renames System.CRTL.malloc;
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   procedure c_free (Ptr : System.Address)
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     renames System.CRTL.free;
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   function c_realloc
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     (Ptr : System.Address; Size : System.CRTL.size_t) return System.Address
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     renames System.CRTL.realloc;
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   -----------
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   -- Alloc --
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   -----------
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   function Alloc (Size : size_t) return System.Address is
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      Result      : System.Address;
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      Actual_Size : size_t := Size;
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   begin
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      if Size = size_t'Last then
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         Raise_Exception (Storage_Error'Identity, "object too large");
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      end if;
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      --  Change size from zero to non-zero. We still want a proper pointer
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      --  for the zero case because pointers to zero length objects have to
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      --  be distinct, but we can't just go ahead and allocate zero bytes,
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      --  since some malloc's return zero for a zero argument.
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      if Size = 0 then
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         Actual_Size := 1;
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      end if;
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      if Parameters.No_Abort then
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         Result := c_malloc (System.CRTL.size_t (Actual_Size));
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      else
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         Abort_Defer.all;
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         Result := c_malloc (System.CRTL.size_t (Actual_Size));
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         Abort_Undefer.all;
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      end if;
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      if Result = System.Null_Address then
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         Raise_Exception (Storage_Error'Identity, "heap exhausted");
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      end if;
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      return Result;
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   end Alloc;
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   ----------
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   -- Free --
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   ----------
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   procedure Free (Ptr : System.Address) is
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   begin
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      if Parameters.No_Abort then
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         c_free (Ptr);
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      else
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         Abort_Defer.all;
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         c_free (Ptr);
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         Abort_Undefer.all;
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      end if;
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   end Free;
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   -------------
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   -- Realloc --
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   -------------
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   function Realloc
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     (Ptr  : System.Address;
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      Size : size_t)
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      return System.Address
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   is
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      Result      : System.Address;
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      Actual_Size : constant size_t := Size;
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   begin
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      if Size = size_t'Last then
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         Raise_Exception (Storage_Error'Identity, "object too large");
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      end if;
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      if Parameters.No_Abort then
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         Result := c_realloc (Ptr, System.CRTL.size_t (Actual_Size));
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      else
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         Abort_Defer.all;
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         Result := c_realloc (Ptr, System.CRTL.size_t (Actual_Size));
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         Abort_Undefer.all;
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      end if;
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      if Result = System.Null_Address then
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         Raise_Exception (Storage_Error'Identity, "heap exhausted");
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      end if;
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      return Result;
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   end Realloc;
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end System.Memory;

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