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  SQL Server Tips by Burleson

The debug toolbar

When in debug mode the debug toolbar will show up and it is more intuitive than using the menus from the IDE. The toolbar has the following options:

The “Registers” button opens a window with the current values of the machine registers (in Assembly language, registers are similar to variables but there is a limited number of them and some have very specific uses). For the examples in this section only three registers are worth considering:

ESP Stack Pointer EBP base pointer EIP Instruction Pointer Table 24.1 – registers to consider for the next examples

A brief description of the registers involved in managing call stacks:

The ESP register contains the address of the top of the stack. Each element in the stack is 32-bits and the last inserted element is the first to be removed (LIFO structure). When an element is inserted (pushed) the ESP register will point to that element in memory and the same thing will happen when removing (popping) as element.

The EBP register points to the top of the stack when the function call starts. The stack will store both function parameters passed to the function and local variables. This particular stack location is known as SFP (Saved Frame Pointer). When a function ends, ESP will get the EBP value and EBP will get the value previously stored in the stack.

The EIP register points to the current memory position where an Assembly language instruction is under execution.

The above book excerpt is from:

Super SQL Server Systems
Turbocharge Database Performance with C++ External Procedures

ISBN: 0-9761573-2-2
Joseph Gama, P. J. Naughter  

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