From: Jonas Hvid <mail@johv.dk>
Date: Thu, 14 Nov 2019 17:28:11 +0000 (+0100)
Subject: Add notes on how literals are handled
X-Git-Url: https://git.rrq.au/?a=commitdiff_plain;h=1da54a4e8c55400181194a2db2cce4b96e479d61;p=rrq%2Fjonasforth.git

Add notes on how literals are handled
---

diff --git a/notes b/notes
index 378a31d..6906550 100644
--- a/notes
+++ b/notes
@@ -90,3 +90,10 @@ Here, DOCOL (the codeword) is address of the simple interpreter described above,
 while EXIT a word (implemented in assembly) that takes care of popping ESI and
 continuing execution. Note that DOCOL, DUP, + and EXIT are all stored as
 addresses which point to codewords.
+
+## Literals
+
+Literals are handled in a special way. There is a word in Forth, called LIT,
+implemented in assembly. When executed, this word looks at the next Forth
+instruction (i.e. the value of ESI), and places that on the stack as a literal,
+and then manipulates ESI to skip over the literal value.