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    <p>Every compiler has its own memory management system. And, to be accurate, you can have several MM working on the same compiler. You can choose which MM to use, depending on your application purpose. For instance, in a Server you may be interested in a multi-thread scaling MM, but on a simple UI Client application, you'd like your MM just to be fast and not memory consuming.</p> <p>The internal Heap management provided by Windows was so slow (at least until XP) that every compiler/framework did implement its own memory manager.</p> <p>For Delphi, there was a "pure Borland" version since 2006, then an Open Source MM, named <a href="http://sourceforge.net/projects/fastmm" rel="nofollow">FastMM4</a>, has been included into the main "Delphi" IDE. </p> <p>With Delphi, it's very easy to change the memory manager. You just create a record of functions, then call the SetMemoryManager() to replace the current MM with the new one.</p> <p>For instance, here is how is installed <a href="http://blog.synopse.info/post/2010/12/04/SynScaleMM" rel="nofollow">our Open Source scaling Memory Manager</a> for Delphi:</p> <pre><code>{$if CompilerVersion &gt;= 17} {$define USEMEMMANAGEREX} {$ifend} var {$ifdef USEMEMMANAGEREX} OldMM: TMemoryManagerEx; {$else} OldMM: TMemoryManager; {$endif} const {$ifdef USEMEMMANAGEREX} ScaleMM_Ex: TMemoryManagerEx = ( GetMem: Scale_GetMem; FreeMem: Scale_FreeMem; ReallocMem: Scale_ReallocMem; AllocMem: Scale_AllocMem; RegisterExpectedMemoryLeak: Scale_RegisterMemoryLeak; UnregisterExpectedMemoryLeak: Scale_UnregisterMemoryLeak ); {$else} ScaleMM_Ex: TMemoryManager = ( GetMem: Scale_GetMem; FreeMem: Scale_FreeMem; ReallocMem: Scale_ReallocMem ); {$endif} procedure ScaleMMInstall; begin // Hook memory Manager GetMemoryManager(OldMM); if @OldMM &lt;&gt; @ScaleMM_Ex then SetMemoryManager(ScaleMM_Ex); // init main thread manager GlobalManager.Init; </code></pre> <p>This code will replace the Delphi MM by our own, via the custom <code>Scale_GetMem</code> / <code>Scale_FreeMem</code> / <code>Scale_ReallocMem</code> / <code>Scale_AllocMem</code> functions. You can just make a wrapper to the old MM by using the <code>OldMM</code> variable:</p> <pre><code>function Scale_GetMem(aSize: Integer): Pointer; begin // do some debugging here result := OldMM.GetMem(aSize); end; </code></pre> <p>The MM record structure changed in time, so you'll have to select the right one - we do this using the <code>USEMEMMANAGEREX</code> conditional.</p>
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    1. POHow to hook AllocMem(), FreeMem() etc... calls ? It can be by any kind of technique dll, executable, etc
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    1. USArnaud Bouchez
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    1. COI think the poster wants to hook externally.
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      1. USDavid Heffernan
    2. CO@David To hook externally, you would have to hook the System.pas _GetMem and _FreeMem functions. It'll be much more difficult to find out how to do that! The only reasonable way of implementing it could be to find out the original _GetMem/_FreeMem asm binary pattern (depending of the RTL version used), then search for it in the EXE, then patch in via some Win32 hooking mechanism. In Delphi, we don't have external libraries to handle the memory, like most C compilers use. This makes external hook much more difficult...
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      1. USArnaud Bouchez
    3. COOk, but it doesn't solve my problem, like A.Bouchez said I need to hook _GetMem and _FreeMem by an external program like I told on my post. Tks any way, your explanation will help others certainly
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      1. USRodrigo Farias Rezino
 

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