| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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; |
