Clearing all entries on the data stack

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Clearing all entries on the data stack

Forum: Open Discussion

Creator: Simon Whittam

Created: 2021-08-20

Updated: 2021-08-20

Simon Whittam - 2021-08-20

In a compiled word, is there a way to clear all entries on the data stack simultaneously without using the 'drop' word ?

Thinking of a situation where one passes multiple entries on the data stack when calling a word and exits prematurely without using all the entries on the data stack.

Does it involve adjusting the data Stack Pointer ?

Out of curiosity I see the words SP@ and SP! mentioned in FF quick reference guides but it's not apparent SP! is available when listing 'words sp' from the FF terminal connection.

TIA, Simon.

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Mikael Nordman - 2021-08-20

Normally you would use drop. It adjusts the stack pointer.

You could use also SP!.

sp@ 10 - sp!

For some reason I removed it from the wordlist.
I guess I thought it is not needed in practice by application code.
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Simon Whittam - 2021-08-20

So SP! is not available in the current version of FF ?

SP! is not recognised by my FF either interactively or compiled.

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Mikael Nordman - 2021-08-20

It is not available. I will put it back when I get back to maintaining FF.
If you are in a hurry you can modify the FF source and recompile.

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