mirror of https://github.com/hsoft/collapseos.git
17 lines
640 B
Plaintext
17 lines
640 B
Plaintext
EXECUTING A WORD
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At it's core, executing a word is pushing the wordref on PS and
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calling EXECUTE. Then, we let the word do its things. Some
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words are special, but most of them are of the compiledWord
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type, and that's their execution that we describe here.
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First of all, at all time during execution, the Interpreter
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Pointer (IP) points to the wordref we're executing next.
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When we execute a compiledWord, the first thing we do is push
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IP to the Return Stack (RS). Therefore, RS' top of stack will
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contain a wordref to execute next, after we EXIT.
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At the end of every compiledWord is an EXIT. This pops RS, sets
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IP to it, and continues.
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