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Diffstat (limited to 'gcc/ada/s-memory-mingw.adb')
| -rw-r--r-- | gcc/ada/s-memory-mingw.adb | 221 |
1 files changed, 0 insertions, 221 deletions
diff --git a/gcc/ada/s-memory-mingw.adb b/gcc/ada/s-memory-mingw.adb deleted file mode 100644 index 31fe0d8..0000000 --- a/gcc/ada/s-memory-mingw.adb +++ /dev/null @@ -1,221 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- 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 version provides ways to limit the amount of used memory for systems --- that do not have OS support for that. - --- The amount of available memory available for dynamic allocation is limited --- by setting the environment variable GNAT_MEMORY_LIMIT to the number of --- kilobytes that can be used. --- --- Windows is currently using this version. - -with Ada.Exceptions; -with System.Soft_Links; - -package body System.Memory is - - use Ada.Exceptions; - use System.Soft_Links; - - function c_malloc (Size : size_t) return System.Address; - pragma Import (C, c_malloc, "malloc"); - - procedure c_free (Ptr : System.Address); - pragma Import (C, c_free, "free"); - - function c_realloc - (Ptr : System.Address; Size : size_t) return System.Address; - pragma Import (C, c_realloc, "realloc"); - - function msize (Ptr : System.Address) return size_t; - pragma Import (C, msize, "_msize"); - - function getenv (Str : String) return System.Address; - pragma Import (C, getenv); - - function atoi (Str : System.Address) return Integer; - pragma Import (C, atoi); - - Available_Memory : size_t := 0; - -- Amount of memory that is available for heap allocations. - -- A value of 0 means that the amount is not yet initialized. - - Msize_Accuracy : constant := 4096; - -- Defines the amount of memory to add to requested allocation sizes, - -- because malloc may return a bigger block than requested. As msize - -- is used when by Free, it must be used on allocation as well. To - -- prevent underflow of available_memory we need to use a reserve. - - procedure Check_Available_Memory (Size : size_t); - -- This routine must be called while holding the task lock. When the - -- memory limit is not yet initialized, it will be set to the value of - -- the GNAT_MEMORY_LIMIT environment variable or to unlimited if that - -- does not exist. If the size is larger than the amount of available - -- memory, the task lock will be freed and a storage_error exception - -- will be raised. - - ----------- - -- 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; - - Lock_Task.all; - - if Actual_Size + Msize_Accuracy >= Available_Memory then - Check_Available_Memory (Size + Msize_Accuracy); - end if; - - Result := c_malloc (Actual_Size); - - if Result /= System.Null_Address then - Available_Memory := Available_Memory - msize (Result); - end if; - - Unlock_Task.all; - - if Result = System.Null_Address then - Raise_Exception (Storage_Error'Identity, "heap exhausted"); - end if; - - return Result; - end Alloc; - - ---------------------------- - -- Check_Available_Memory -- - ---------------------------- - - procedure Check_Available_Memory (Size : size_t) is - Gnat_Memory_Limit : System.Address; - - begin - if Available_Memory = 0 then - - -- The amount of available memory hasn't been initialized yet - - Gnat_Memory_Limit := getenv ("GNAT_MEMORY_LIMIT" & ASCII.NUL); - - if Gnat_Memory_Limit /= System.Null_Address then - Available_Memory := - size_t (atoi (Gnat_Memory_Limit)) * 1024 + Msize_Accuracy; - else - Available_Memory := size_t'Last; - end if; - end if; - - if Size >= Available_Memory then - - -- There is a memory overflow - - Unlock_Task.all; - Raise_Exception - (Storage_Error'Identity, "heap memory limit exceeded"); - end if; - end Check_Available_Memory; - - ---------- - -- Free -- - ---------- - - procedure Free (Ptr : System.Address) is - begin - Lock_Task.all; - - if Ptr /= System.Null_Address then - Available_Memory := Available_Memory + msize (Ptr); - end if; - - c_free (Ptr); - - Unlock_Task.all; - end Free; - - ------------- - -- Realloc -- - ------------- - - function Realloc - (Ptr : System.Address; - Size : size_t) - return System.Address - is - Result : System.Address; - Actual_Size : constant size_t := Size; - Old_Size : size_t; - - begin - if Size = size_t'Last then - Raise_Exception (Storage_Error'Identity, "object too large"); - end if; - - Lock_Task.all; - - Old_Size := msize (Ptr); - - -- Conservative check - no need to try to be precise here - - if Size + Msize_Accuracy >= Available_Memory then - Check_Available_Memory (Size + Msize_Accuracy); - end if; - - Result := c_realloc (Ptr, Actual_Size); - - if Result /= System.Null_Address then - Available_Memory := Available_Memory + Old_Size - msize (Result); - end if; - - Unlock_Task.all; - - if Result = System.Null_Address then - Raise_Exception (Storage_Error'Identity, "heap exhausted"); - end if; - - return Result; - end Realloc; - -end System.Memory; |