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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 version contains allocation tracking capability
+
+-- The object file corresponding to this instrumented version is to be found
+-- in libgmem.
+
+-- When enabled, the subsystem logs all the calls to __gnat_malloc and
+-- __gnat_free. This log can then be processed by gnatmem to detect
+-- dynamic memory leaks.
+
+-- To use this functionality, you must compile your application with -g
+-- and then link with this object file:
+
+-- gnatmake -g program -largs -lgmem
+
+-- After compilation, you may use your program as usual except that upon
+-- completion, it will generate in the current directory the file gmem.out.
+
+-- You can then investigate for possible memory leaks and mismatch by calling
+-- gnatmem with this file as an input:
+
+-- gnatmem -i gmem.out program
+
+-- See gnatmem section in the GNAT User's Guide for more details
+
+-- NOTE: This capability is currently supported on the following targets:
+
+-- Windows
+-- AIX
+-- GNU/Linux
+-- HP-UX
+-- Irix
+-- Solaris
+-- Tru64
+-- Alpha OpenVMS
+
+-- NOTE FOR FUTURE PLATFORMS SUPPORT: It is assumed that type Duration is
+-- 64 bit. If the need arises to support architectures where this assumption
+-- is incorrect, it will require changing the way timestamps of allocation
+-- events are recorded.
+
+pragma Source_File_Name (System.Memory, Body_File_Name => "memtrack.adb");
+
+with Ada.Exceptions;
+with System.Soft_Links;
+with System.Traceback;
+with System.Traceback_Entries;
+with GNAT.IO;
+with System.OS_Primitives;
+
+package body System.Memory is
+
+ use Ada.Exceptions;
+ use System.Soft_Links;
+ use System.Traceback;
+ use System.Traceback_Entries;
+ use GNAT.IO;
+
+ 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");
+
+ subtype File_Ptr is System.Address;
+
+ function fopen (Path : String; Mode : String) return File_Ptr;
+ pragma Import (C, fopen);
+
+ procedure OS_Exit (Status : Integer);
+ pragma Import (C, OS_Exit, "__gnat_os_exit");
+ pragma No_Return (OS_Exit);
+
+ procedure fwrite
+ (Ptr : System.Address;
+ Size : size_t;
+ Nmemb : size_t;
+ Stream : File_Ptr);
+
+ procedure fwrite
+ (Str : String;
+ Size : size_t;
+ Nmemb : size_t;
+ Stream : File_Ptr);
+ pragma Import (C, fwrite);
+
+ procedure fputc (C : Integer; Stream : File_Ptr);
+ pragma Import (C, fputc);
+
+ procedure fclose (Stream : File_Ptr);
+ pragma Import (C, fclose);
+
+ procedure Finalize;
+ pragma Export (C, Finalize, "__gnat_finalize");
+ -- Replace the default __gnat_finalize to properly close the log file
+
+ Address_Size : constant := System.Address'Max_Size_In_Storage_Elements;
+ -- Size in bytes of a pointer
+
+ Max_Call_Stack : constant := 200;
+ -- Maximum number of frames supported
+
+ Tracebk : aliased array (0 .. Max_Call_Stack) of Traceback_Entry;
+ Num_Calls : aliased Integer := 0;
+
+ Gmemfname : constant String := "gmem.out" & ASCII.NUL;
+ -- Allocation log of a program is saved in a file gmem.out
+ -- ??? What about Ada.Command_Line.Command_Name & ".out" instead of static
+ -- gmem.out
+
+ Gmemfile : File_Ptr;
+ -- Global C file pointer to the allocation log
+
+ Needs_Init : Boolean := True;
+ -- Reset after first call to Gmem_Initialize
+
+ procedure Gmem_Initialize;
+ -- Initialization routine; opens the file and writes a header string. This
+ -- header string is used as a magic-tag to know if the .out file is to be
+ -- handled by GDB or by the GMEM (instrumented malloc/free) implementation.
+
+ First_Call : Boolean := True;
+ -- Depending on implementation, some of the traceback routines may
+ -- themselves do dynamic allocation. We use First_Call flag to avoid
+ -- infinite recursion
+
+ -----------
+ -- Alloc --
+ -----------
+
+ function Alloc (Size : size_t) return System.Address is
+ Result : aliased System.Address;
+ Actual_Size : aliased size_t := Size;
+ Timestamp : aliased Duration;
+
+ 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;
+
+ Result := c_malloc (Actual_Size);
+
+ if First_Call then
+
+ -- Logs allocation call
+ -- format is:
+ -- 'A' <mem addr> <size chunk> <len backtrace> <addr1> ... <addrn>
+
+ First_Call := False;
+
+ if Needs_Init then
+ Gmem_Initialize;
+ end if;
+
+ Timestamp := System.OS_Primitives.Clock;
+ Call_Chain (Tracebk'Address, Max_Call_Stack, Num_Calls,
+ Skip_Frames => 2);
+ fputc (Character'Pos ('A'), Gmemfile);
+ fwrite (Result'Address, Address_Size, 1, Gmemfile);
+ fwrite (Actual_Size'Address, size_t'Max_Size_In_Storage_Elements, 1,
+ Gmemfile);
+ fwrite (Timestamp'Address, Duration'Max_Size_In_Storage_Elements, 1,
+ Gmemfile);
+ fwrite (Num_Calls'Address, Integer'Max_Size_In_Storage_Elements, 1,
+ Gmemfile);
+
+ for J in Tracebk'First .. Tracebk'First + Num_Calls - 1 loop
+ declare
+ Ptr : System.Address := PC_For (Tracebk (J));
+ begin
+ fwrite (Ptr'Address, Address_Size, 1, Gmemfile);
+ end;
+ end loop;
+
+ First_Call := True;
+
+ end if;
+
+ Unlock_Task.all;
+
+ if Result = System.Null_Address then
+ Raise_Exception (Storage_Error'Identity, "heap exhausted");
+ end if;
+
+ return Result;
+ end Alloc;
+
+ --------------
+ -- Finalize --
+ --------------
+
+ procedure Finalize is
+ begin
+ if not Needs_Init then
+ fclose (Gmemfile);
+ end if;
+ end Finalize;
+
+ ----------
+ -- Free --
+ ----------
+
+ procedure Free (Ptr : System.Address) is
+ Addr : aliased constant System.Address := Ptr;
+ Timestamp : aliased Duration;
+
+ begin
+ Lock_Task.all;
+
+ if First_Call then
+
+ -- Logs deallocation call
+ -- format is:
+ -- 'D' <mem addr> <len backtrace> <addr1> ... <addrn>
+
+ First_Call := False;
+
+ if Needs_Init then
+ Gmem_Initialize;
+ end if;
+
+ Call_Chain (Tracebk'Address, Max_Call_Stack, Num_Calls,
+ Skip_Frames => 2);
+ Timestamp := System.OS_Primitives.Clock;
+ fputc (Character'Pos ('D'), Gmemfile);
+ fwrite (Addr'Address, Address_Size, 1, Gmemfile);
+ fwrite (Timestamp'Address, Duration'Max_Size_In_Storage_Elements, 1,
+ Gmemfile);
+ fwrite (Num_Calls'Address, Integer'Max_Size_In_Storage_Elements, 1,
+ Gmemfile);
+
+ for J in Tracebk'First .. Tracebk'First + Num_Calls - 1 loop
+ declare
+ Ptr : System.Address := PC_For (Tracebk (J));
+ begin
+ fwrite (Ptr'Address, Address_Size, 1, Gmemfile);
+ end;
+ end loop;
+
+ c_free (Ptr);
+
+ First_Call := True;
+ end if;
+
+ Unlock_Task.all;
+ end Free;
+
+ ---------------------
+ -- Gmem_Initialize --
+ ---------------------
+
+ procedure Gmem_Initialize is
+ Timestamp : aliased Duration;
+
+ begin
+ if Needs_Init then
+ Needs_Init := False;
+ System.OS_Primitives.Initialize;
+ Timestamp := System.OS_Primitives.Clock;
+ Gmemfile := fopen (Gmemfname, "wb" & ASCII.NUL);
+
+ if Gmemfile = System.Null_Address then
+ Put_Line ("Couldn't open gnatmem log file for writing");
+ OS_Exit (255);
+ end if;
+
+ fwrite ("GMEM DUMP" & ASCII.LF, 10, 1, Gmemfile);
+ fwrite (Timestamp'Address, Duration'Max_Size_In_Storage_Elements, 1,
+ Gmemfile);
+ end if;
+ end Gmem_Initialize;
+
+ -------------
+ -- Realloc --
+ -------------
+
+ function Realloc
+ (Ptr : System.Address;
+ Size : size_t) return System.Address
+ is
+ Addr : aliased constant System.Address := Ptr;
+ Result : aliased System.Address;
+ Timestamp : aliased Duration;
+
+ begin
+ -- For the purposes of allocations logging, we treat realloc as a free
+ -- followed by malloc. This is not exactly accurate, but is a good way
+ -- to fit it into malloc/free-centered reports.
+
+ if Size = size_t'Last then
+ Raise_Exception (Storage_Error'Identity, "object too large");
+ end if;
+
+ Abort_Defer.all;
+ Lock_Task.all;
+
+ if First_Call then
+ First_Call := False;
+
+ -- We first log deallocation call
+
+ if Needs_Init then
+ Gmem_Initialize;
+ end if;
+ Call_Chain (Tracebk'Address, Max_Call_Stack, Num_Calls,
+ Skip_Frames => 2);
+ Timestamp := System.OS_Primitives.Clock;
+ fputc (Character'Pos ('D'), Gmemfile);
+ fwrite (Addr'Address, Address_Size, 1, Gmemfile);
+ fwrite (Timestamp'Address, Duration'Max_Size_In_Storage_Elements, 1,
+ Gmemfile);
+ fwrite (Num_Calls'Address, Integer'Max_Size_In_Storage_Elements, 1,
+ Gmemfile);
+
+ for J in Tracebk'First .. Tracebk'First + Num_Calls - 1 loop
+ declare
+ Ptr : System.Address := PC_For (Tracebk (J));
+ begin
+ fwrite (Ptr'Address, Address_Size, 1, Gmemfile);
+ end;
+ end loop;
+
+ -- Now perform actual realloc
+
+ Result := c_realloc (Ptr, Size);
+
+ -- Log allocation call using the same backtrace
+
+ fputc (Character'Pos ('A'), Gmemfile);
+ fwrite (Result'Address, Address_Size, 1, Gmemfile);
+ fwrite (Size'Address, size_t'Max_Size_In_Storage_Elements, 1,
+ Gmemfile);
+ fwrite (Timestamp'Address, Duration'Max_Size_In_Storage_Elements, 1,
+ Gmemfile);
+ fwrite (Num_Calls'Address, Integer'Max_Size_In_Storage_Elements, 1,
+ Gmemfile);
+
+ for J in Tracebk'First .. Tracebk'First + Num_Calls - 1 loop
+ declare
+ Ptr : System.Address := PC_For (Tracebk (J));
+ begin
+ fwrite (Ptr'Address, Address_Size, 1, Gmemfile);
+ end;
+ end loop;
+
+ First_Call := True;
+ end if;
+
+ Unlock_Task.all;
+ Abort_Undefer.all;
+
+ if Result = System.Null_Address then
+ Raise_Exception (Storage_Error'Identity, "heap exhausted");
+ end if;
+
+ return Result;
+ end Realloc;
+
+end System.Memory;