Compilers: Principles and Practice by Pearson

190 Compilers – Principles and Practice

addressing within the called function. The call arguments are available at (BP) + 4, (BP) + 6 and

(BP) + 8. The return address is at (BP) + 2 and the caller’s BP is at (BP).

The actions within the called function are:

1. Push BP: the caller’s BP is saved in the stack;

2. Copy SP to BP: set up the current frame (base) pointer;

3. Do whatever computation for this function, but do not disturb BP;

4. Pop BP, the caller’s BP restored;

5. Return from this function. Note that the return address will be at TOS.

The relevant code in function test(), assuming that it does not use any local variables, is:

test:

pushw ...