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[/] [scarts/] [trunk/] [toolchain/] [scarts-gcc/] [gcc-4.1.1/] [gcc/] [ada/] [s-memory.adb] - Rev 20
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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) 2001-2005 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 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, 51 Franklin Street, Fifth Floor, -- -- Boston, MA 02110-1301, 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 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. 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;
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