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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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