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Common Assembly-Language Constructs Up to this point, I've just been covering basic assembly-language instructions Now I want to start looking at various assembly-language constructs that you'll encounter and explain how you identify them and translate them into higher-level operations FS Register Access In Win32 operating systems, the FS register is special because the pointer to the thread information block (TIB) is stored in it The TIB is also called the thread environment block (TEB) The TIB holds all the thread-specific data so that the operating system can keep your thread access straight This thread-specific data includes all the structured exception handling (SEH) chains, thread local storage, the thread stack, and other information needed internally For more information about SEH, see 13 For an example of thread local storage, see the MemStress discussion in 17.

Reflective support in AspectJ provides programmatic access to the static and dynamic information associated with the join points. For example, using reflection, you can access the name of the currently advised method as well as the argument objects to that method. The dynamic context that can be captured using reflective support is similar to that captured using this(), target(), and args() pointcuts only the mechanism to obtain the information is different. The most common use of this reflective information is in aspects that implement logging and similar functionaliy. We have already used simple reflective support to write the JoinPointTraceAspect in chapter 2. In this section, we examine the details of reflective support.

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The base aspect, IndentedLogging, was discussed in section 5.5.2. It provides the support for indenting the log statements according to their call depth. We need to define the loggedOperation() pointcut that was declared in the base IndentedLogging aspect. Later, we will add authentication and authorization logging to it as we develop the solution. We won t log more details about the activities (such as account number and amount involved), since the correctness of the core implementation is not the focus of this chapter.

The TIB is stored in a special memory segment, and when the operating system needs to access the TIB, it converts the FS register plus an offset into a normal linear address When you see an instruction accessing the FS register, one of the following operations is underway: an SEH frame is being created or destroyed, the TIB is being accessed, or thread local storage is being accessed Creating or Destroying an SEH Frame The first instructions after setting up the stack frame are often something like the following code, which is standard code to start a __try block The first node in the chain of SEH handlers is at offset 0 in the TIB In the following disassembly, the compiler is pushing a data value and a pointer to a function on the stack That function is __except_handler3 in Windows 2000 code.

# Reference the common Framework libraries /r:Accessibility.dll /r:Microsoft.CSharp.dll /r:System.Configuration.dll /r:System.Configuration.Install.dll /r:System.Core.dll /r:System.Data.dll /r:System.Data.DataSetExtensions.dll /r:System.Data.Linq.dll /r:System.Deployment.dll /r:System.Device.dll /r:System.DirectoryServices.dll /r:System.dll /r:System.Drawing.dll /r:System.EnterpriseServices.dll /r:System.Management.dll /r:System.Messaging.dll /r:System.Numerics.dll /r:System.Runtime.Remoting.dll /r:System.Runtime.Serialization.dll /r:System.Runtime.Serialization.Formatters.Soap.dll /r:System.Security.dll

Subsequent headers do a lot of negotiation, with the client telling the server what content types, character sets, and so on it can understand. Because I ve visited Google before, it also sends a cookie, a short message telling Google who I am. The response headers, shown here, also contain quite a lot of information:

In Windows XP operating system code, the special function is _SEH_prolog The first MOV instruction is accessing the TIB; the offset of 0 indicates that a node is being added to the top of the exception chain The last two instructions indicate where the code moves the actual node to the chain PUSH 004060d0 PUSH 004014a0 MOV MOV EAX , FS:[00000000] DWORD PTR FS:[0] , ESP PUSH EAX.

Low-level access to page content, aka direct content Convenience methods for writing direct content Using the ColumnText object Reusing content with the PdfTemplate object

Analyze="True"

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