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leaked unintentionally because it was called incorrectly, but there are also good leaks In fact, the _alloca function in C + + is designed specifically to push extra stack In C+ + , I use stack allocation whenever I can because it greatly reduces the number of heap allocations during the program Since VB doesn't care about stack pushed during a vtable call, you can write a stack allocation routine for use in VB code without being punished immediately, as you would be with an API call Before looking at the StackAlloc code, a short discussion of how the stack is used might make you more comfortable with moving the stack pointer during a function call You will also see that unmanaged stack leaks can wreak havoc with calling functions There are two CPU registers that are used to control stack: esp (stack pointer) and ebp (base pointer), esp is the current position of the stack Pushing stack (that is, adding new data to the stack) decreases the value of esp Popping stack increases the value in this register, ebp is called the stack frame and is used to give every function a base reference point in the stack The first instructions to run in a function are known as prolog code The standard prolog code looks something like the following push ebp mov ebp,esp sub esp, push ebx push esi push edi ;push the current stack frame ;ebp=esp, use the stack position as the ;new frame localsize ;esp=esp-localsize, push stack for local ;variables ;save the ebx register on the stack ;save the esi register on the stack ;save the edi register on the stack

Identification Patterns To avoid performance bottlenecks and single points of failure, clients should use LOOKUP sparsely. For example, you should only register factory objects, in the sense of Factory Method [GHJV95] and Abstract Factory [GHJV95], and obtain further references through them. To further reduce the chances for failure, lookup services are typically replicated and/or federated across several hosts. Keeping the replicas consistent does incur a performance overhead, which is another reason for storing only a few important initial objects in the LOOKUP service. This pattern was originally documented in POSA3 [KJ04].

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The standard prolog code saves the current stack frame by pushing it on the stack, moves the frame up to the current stack position, and pushes enough stack to handle its local variables Then the registers that must be maintained across function calls are pushed on the stack After the prolog code, the stack looks like this, with the current stack pointer at the top of this list previous value of edi (stack pointer after prolog) previous value of esi previous value of ebx local variable 2

The three patterns introduced in this chapter are used for locating objects. The use of the OBJECT ID pattern has already been implicitly shown in the sequence diagram examples in 3, Basic Remoting Patterns, where the OBJECT ID was used by the INVOKER to find the target remote object in its list of instances. The following sequence diagram shows how a server application registers the reference of a remote object in LOOKUP and how a client uses the lookup service to retrieve this reference. The ABSOLUTE OBJECT REFERENCE of the lookup service has been configured manually, both in the server application and in the client application. Both server application and client use a framework facade to retrieve the initial reference to the lookup service. Here the framework facade acts a utility class providing access to the middleware s core features. The lookup service is itself implemented as a remote object, offering the operations bind for registering remote objects and lookup for looking up ABSOLUTE OBJECT REFERENCES of remote objects.

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Framework Facade (Client) Server Application init() create l := getService("Lookup") aor := getAOR(ro) init() l := getService("Lookup") lookup("example/myObject" ) someOperation(x) bind("example/myObject", aor) Framework Facade (Server) ro:Remote Object

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The next illustration shows how a client invokes an operation of a remote object, passing another remote object as parameter. The MARSHALLER gets the invocation parameters and recognizes that some of them are remote objects located on a server. In this example, the

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