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