feat: Execute fib, add dec instruction, fix constants in memory creation

2 files changed, 15 insertions, 3 deletions

diff --git a/vm/src/vm/memory.rs b/vm/src/vm/memory.rs
index 33a6de6..319b647 100644
--- a/vm/src/vm/memory.rs
+++ b/vm/src/vm/memory.rs
@@ -3,6 +3,8 @@ use std::{
     ops::Index,
 };
 
+use super::primitive::spa;
+
 pub(crate) type Word = i64;
 
 // Size of each memory block in words
@@ -40,9 +42,13 @@ impl Memory {
     }
 
     fn new() -> Memory {
-        Memory {
+        let mut out = Memory {
             sparse_pages: HashMap::from([(0, Default::default())]),
-        }
+        };
+        *out.get_mut(spa::Z) = 0;
+        *out.get_mut(spa::E) = 1;
+        *out.get_mut(spa::N) = -1;
+        out
     }
 
     pub(crate) fn new_from(mem: &Vec<Word>) -> Memory {
@@ -50,6 +56,9 @@ impl Memory {
         for (i, chunk) in mem.chunks(PAGE_SIZE).enumerate() {
             memobj.sparse_pages.insert(i, Page::new(chunk));
         }
+        *memobj.get_mut(spa::Z) = 0;
+        *memobj.get_mut(spa::E) = 1;
+        *memobj.get_mut(spa::N) = -1;
         memobj
     }
 
diff --git a/vm/src/vm/primitive.rs b/vm/src/vm/primitive.rs
index 43f217f..3e41bd0 100644
--- a/vm/src/vm/primitive.rs
+++ b/vm/src/vm/primitive.rs
@@ -2,7 +2,10 @@ use crate::vm::memory::{ Memory, Word };
 
 // Special addrs
 pub mod spa {
-    pub(crate) const PROGRAM_COUNTER: usize = 2;
+    pub(crate) const Z: usize = 0;
+    pub(crate) const E: usize = 1;
+    pub(crate) const N: usize = 2;
+    pub(crate) const PROGRAM_COUNTER: usize = 3;
 }
 
 #[derive(Debug, PartialEq, Eq)]