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-------------------------------------------------------------------------------
--- --
--- GNAT RUN-TIME COMPONENTS --
--- --
--- S Y S T E M . M E M O R Y --
--- --
--- B o d y --
--- --
--- Copyright (C) 2001-2009, 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 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 abort because on most systems, an
--- asynchronous signal (as used for implementing asynchronous abort 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.
-
-pragma Warnings (Off);
-pragma Compiler_Unit;
-pragma Warnings (On);
-
-with Ada.Exceptions;
-with System.Soft_Links;
-with System.Parameters;
-with System.CRTL;
-
-package body System.Memory is
-
- use Ada.Exceptions;
- use System.Soft_Links;
-
- function c_malloc (Size : System.CRTL.size_t) return System.Address
- renames System.CRTL.malloc;
-
- procedure c_free (Ptr : System.Address)
- renames System.CRTL.free;
-
- function c_realloc
- (Ptr : System.Address; Size : System.CRTL.size_t) return System.Address
- renames System.CRTL.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;
-
- if Parameters.No_Abort then
- Result := c_malloc (System.CRTL.size_t (Actual_Size));
- else
- Abort_Defer.all;
- Result := c_malloc (System.CRTL.size_t (Actual_Size));
- Abort_Undefer.all;
- end if;
-
- 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
- if Parameters.No_Abort then
- c_free (Ptr);
- else
- Abort_Defer.all;
- c_free (Ptr);
- Abort_Undefer.all;
- end if;
- end Free;
-
- -------------
- -- Realloc --
- -------------
-
- function Realloc
- (Ptr : System.Address;
- Size : size_t)
- return System.Address
- is
- Result : System.Address;
- Actual_Size : constant size_t := Size;
-
- begin
- if Size = size_t'Last then
- Raise_Exception (Storage_Error'Identity, "object too large");
- end if;
-
- if Parameters.No_Abort then
- Result := c_realloc (Ptr, System.CRTL.size_t (Actual_Size));
- else
- Abort_Defer.all;
- Result := c_realloc (Ptr, System.CRTL.size_t (Actual_Size));
- Abort_Undefer.all;
- end if;
-
- if Result = System.Null_Address then
- Raise_Exception (Storage_Error'Identity, "heap exhausted");
- end if;
-
- return Result;
- end Realloc;
-
-end System.Memory;