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1 INTRODUCTION TO THE TOOLS
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The capability of LeakDiag to support all these allocators makes it a very flexible tool to be used for memory leak detection Another significant difference from most other memory leak detection tools is the way in which LeakDiag collects memory-related activity Rather than relying on the operating system support for recording memory allocation stack traces, LeakDiag uses Microsoft s Detours technology to intercept calls to the memory allocators By doing so, LeakDiag eliminates the need to enable stack tracing support in the operating system Figure 11 shows the start screen of the GUI version of LeakDiag The LeakDiag interface has two main sections: the list of all running processes and the available memory allocators with associated action buttons To start memory allocation tracking, simply select one of the running processes followed by the memory allocator that you want to track Click the Start button, followed by the Log button Reproduce the memory leak and click the Log button once again When you are finished tracking, click the Stop button LeakDiag outputs all the information into log files in XML format By default, the log files are written to C:\LeakDiag\logs and the log files are named by LeakDiag itself to guarantee a unique filename for each run
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1
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As with most memory leak detection tools, LeakDiag works on the basis of snapshot comparisons By taking snapshots of all the memory allocations at regular intervals, LeakDiag is capable of taking a delta between snapshots to describe allocations that have not yet been freed (potential leaks) The Log button is the mechanism by which you take the snapshots LeakdDiag has a few options that allow you to customize the default behavior By selecting the Options menu item on the Tools menu, you are presented with the Options dialog, as shown in Figure 12
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Figure 12 In the Options dialog, you can change the location of the log files, as well as specify the symbol path As with most stack tracing tools, proper symbols are required for LeakDiag to be capable of producing useful stack traces If you incorrectly specify the symbol path or the symbols are wrong, you will see only the addresses for each frame in the stack trace Having said that, stack trace recording is an expensive operation that can dramatically alter the speed of execution As a matter of fact, at times, the speed of execution can be altered to the point where the memory leak will not even surface (if it is because of concurrency and/or timing related issues) Fortunately, a check box also exists that allows you to disable the symbol resolution while logging The Allocation size filter enables you to specify the range of allocation sizes that you want to track Finally, stack depth enables you to specify the number of frames per stack trace that will be outputted to the log file For a detailed description of the command-line mode of LeakDiag, as well as the log file format, see 9, Resource Leaks, where we use LeakDiag to analyze and nail down a real memory leak
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The Microsoft Detours Library
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Microsoft Detours is an innovative solution to the problem of instrumenting and/or improving existing code at the binary level Historically, instrumenting and/or improving code involved simply changing the source code and recompiling However, in today s world of commercial development, you will rarely (if ever) have access to the source code for a component or product Microsoft Detours allows you to intercept binary functions and provide your own detour function that can either completely replace the original function or add some code and then call the original function (via a trampoline) It does this seeming magic by replacing the first few instructions of the original function with an unconditional jump to the new function It is important to understand that this process happens at runtime and is not persisted, which in essence means that you can detour different instances of the same application independent of one another For more information on Microsoft Detours, please see http://researchmicrosoftcom/ sn/detours
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