From 01daee374a299646c595dd245c8e4a4990769002 Mon Sep 17 00:00:00 2001
From: David Li <li.davidm96@gmail.com>
Date: Sun, 26 Nov 2017 19:59:00 -0500
Subject: Translate variable bindings

---
 src/semantic/frame.rs | 33 +++++++++++++++++++++++++++++----
 1 file changed, 29 insertions(+), 4 deletions(-)

(limited to 'src/semantic/frame.rs')

diff --git a/src/semantic/frame.rs b/src/semantic/frame.rs
index ddfc330..95d18a1 100644
--- a/src/semantic/frame.rs
+++ b/src/semantic/frame.rs
@@ -1,3 +1,4 @@
+use super::ir;
 use super::temp;
 
 pub enum Location {
@@ -16,17 +17,20 @@ pub trait Frame {
     fn new(name: temp::TempLabel, formals: Vec<Escape>) -> Self;
     fn name(&self) -> temp::TempLabel;
     fn formals(&self) -> &[Location];
-    fn alloc_local(&mut self, escapes: Escape) -> Location;
+    fn alloc_local(&mut self, temp: &mut temp::Temp, escapes: Escape) -> Location;
+    fn location_to_exp(&mut self, location: Location) -> ir::Expression;
 }
 
 pub struct Amd64Frame {
+    offset: u64,
     name: temp::TempLabel,
 }
 
 impl Frame for Amd64Frame {
     fn new(name: temp::TempLabel, formals: Vec<Escape>) -> Self {
         Amd64Frame {
-            name,
+            offset: 0,
+            name: name,
         }
     }
 
@@ -38,7 +42,28 @@ impl Frame for Amd64Frame {
         unimplemented!();
     }
 
-    fn alloc_local(&mut self, escapes: Escape) -> Location {
-        unimplemented!();
+    fn alloc_local(&mut self, temp: &mut temp::Temp, escapes: Escape) -> Location {
+        // TODO: this is WRONG
+        Location::InFrame { offset: 0 }
+    }
+
+    fn location_to_exp(&mut self, location: Location) -> ir::Expression {
+        match location {
+            Location::InFrame { offset } => {
+                ir::Expression::Memory(
+                    Box::new(
+                        ir::Expression::BinOp(
+                            ir::BinOp::Plus,
+                            Box::new(ir::Expression::Const(self.offset)),
+                            Box::new(ir::Expression::Const(offset as u64)),
+                        )
+                    )
+                )
+            }
+            Location::Register(name) => {
+                ir::Expression::Temp(name)
+            }
+        }
+
     }
 }
-- 
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