Are local frame variables zero ?

[BlackVortex]

As the topic says, when I use for example :

Code Select Expand

MyFunction FRAME Input1
USES EBX,ESI,EDI
LOCALS Var1

Is Var1 always zero, or do I have to zero it myself ? I hope I don't sound stupid, I'm kinda tired etc  :toothy

[BogdanOntanu]

You have to zero it yourself.

Locals are usually implemented as stack locations and because of this they can contain garbage from stack's previouse contents.

[BlackVortex]

Ok, thanks, got to remember that.

[donkey]

Hi BlackVortex,

If you include macros.h you can call ClearLocals in your stack frame and it will clear all local variables to zero. For example:

Code Select Expand

MyFunction FRAME SomeParam
    uses edi,esi,ebx
    LOCAL LOC1,LOC2,LOC3
    ClearLocals
    ....
ENDF

[BlackVortex]

Hmm, sounds useful, gonna try it tomorrow and check the resulting assembly.