From c6c9aa4e5f3e5a01fcb9ccabf6dbd2f6da277650 Mon Sep 17 00:00:00 2001
From: Miquel Sabaté Solà <mikisabate@gmail.com>
Date: Mon, 15 Jul 2024 08:55:57 +0200
Subject: Add the notion of mapping
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Mappings and segments are fundamental blocks on how code is distributed
both on the actual ROM File and in the memory layout.

Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
---
 lib/xixanta/src/mapping.rs | 66 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 lib/xixanta/src/mapping.rs

(limited to 'lib/xixanta/src/mapping.rs')

diff --git a/lib/xixanta/src/mapping.rs b/lib/xixanta/src/mapping.rs
new file mode 100644
index 0000000..56acf18
--- /dev/null
+++ b/lib/xixanta/src/mapping.rs
@@ -0,0 +1,66 @@
+use crate::instruction::{Fill, Node, PString};
+use std::collections::HashMap;
+
+use crate::errors::ParseError;
+type Result<T> = std::result::Result<T, ParseError>;
+
+#[derive(Debug, Clone, Eq, Ord, PartialEq, PartialOrd)]
+pub struct Segment {
+    pub name: String,
+    pub start: u16,
+    pub size: usize,
+    pub fill_value: Option<Fill>,
+}
+
+#[derive(Debug)]
+pub struct Mapping {
+    pub segments: Vec<Segment>,
+    pub nodes: HashMap<String, Vec<Node>>,
+    current: String,
+}
+
+impl Mapping {
+    pub fn new(mut segments: Vec<Segment>) -> Self {
+        segments.sort_by(|a, b| b.start.cmp(&a.start));
+
+        let mut nodes = HashMap::new();
+        for segment in segments.iter() {
+            nodes.insert(segment.name.clone(), vec![]);
+        }
+
+        let current_segment = &segments.first().unwrap().name.clone();
+
+        Mapping {
+            segments,
+            nodes,
+            current: current_segment.to_string(),
+        }
+    }
+
+    pub fn reset(&mut self) {
+        // TODO
+    }
+
+    pub fn switch(&mut self, id: &PString) -> Result<()> {
+        if !self.nodes.contains_key(&id.value) {
+            return Err(
+                id.parser_error(format!("segment '{}' has not been defined", id.value).as_str())
+            );
+        }
+
+        id.value.clone_into(&mut self.current);
+        Ok(())
+    }
+
+    pub fn current(&self) -> &Vec<Node> {
+        self.nodes.get(&self.current).unwrap()
+    }
+
+    pub fn current_mut(&mut self) -> &mut Vec<Node> {
+        self.nodes.get_mut(&self.current).unwrap()
+    }
+
+    pub fn push(&mut self, node: Node) {
+        self.nodes.get_mut(&self.current).unwrap().push(node);
+    }
+}
-- 
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