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/analysis.rs  | 12 +++++++-----
 src/semantic/frame.rs     | 33 +++++++++++++++++++++++++++++----
 src/semantic/translate.rs | 14 ++++++++++++++
 3 files changed, 50 insertions(+), 9 deletions(-)

diff --git a/src/semantic/analysis.rs b/src/semantic/analysis.rs
index 973e703..152ede9 100644
--- a/src/semantic/analysis.rs
+++ b/src/semantic/analysis.rs
@@ -75,7 +75,7 @@ fn trans_decl<'a, 'b, F: frame::Frame>(
     level: &mut Level<'b, F>,
     venv: &mut TypeEnvironment<'a>,
     tenv: &mut TypeEnvironment<'a>,
-    decl: &WithLocation<ast::Declaration>) -> Result<Ty> {
+    decl: &WithLocation<ast::Declaration>) -> Result<(translate::Expression, Ty)> {
     match decl.declaration {
         ast::DeclarationBody::Fun { ref ty, ref params, ref body } => {
             let declared_ty = if let &Some(ref ty) = ty {
@@ -103,10 +103,12 @@ fn trans_decl<'a, 'b, F: frame::Frame>(
                 }
             }
 
-            Ok(Ty::Function(arg_types, Box::new(body_ty)))
+            return err!(decl, TypeError::Unimplemented);
+            // Ok(Ty::Function(arg_types, Box::new(body_ty)))
         }
         ast::DeclarationBody::Ty { ref ty } => {
-            trans_ty(venv, tenv, ty)
+            return err!(decl, TypeError::Unimplemented);
+            // trans_ty(venv, tenv, ty)
         }
         ast::DeclarationBody::Var { ref ty, ref value } => {
             let (var_exp, actual_ty) =
@@ -120,7 +122,7 @@ fn trans_decl<'a, 'b, F: frame::Frame>(
                     });
                 }
             }
-            Ok(actual_ty)
+            Ok((tr.alloc_local(level, frame::Escape::Yes), actual_ty))
         }
     }
 }
@@ -139,7 +141,7 @@ fn trans_exp<'a, 'b, F: frame::Frame>(
             let mut new_venv = TypeEnvironment::new(Some(venv));
             let mut new_tenv = TypeEnvironment::new(Some(tenv));
             for decl in decls.iter() {
-                let decl_ty = trans_decl(tr, level, &mut new_venv, &mut new_tenv, decl)?;
+                let (decl_exp, decl_ty) = trans_decl(tr, level, &mut new_venv, &mut new_tenv, decl)?;
                 match decl.declaration {
                     ast::DeclarationBody::Fun { .. } | ast::DeclarationBody::Var { .. } => {
                         new_venv.add_binding(decl.name.clone(), decl_ty);
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)
+            }
+        }
+
     }
 }
diff --git a/src/semantic/translate.rs b/src/semantic/translate.rs
index 57581a4..5e68f36 100644
--- a/src/semantic/translate.rs
+++ b/src/semantic/translate.rs
@@ -59,4 +59,18 @@ impl<F: frame::Frame> Translate<F> {
             _ => panic!("Can't make binop from Void"),
         }
     }
+
+    pub fn alloc_local<'a>(&mut self,
+                           level: &mut Level<'a, F>,
+                           escapes: frame::Escape) -> Expression {
+        match level {
+            &mut Level::Top => {
+                panic!("Can't allocate in toplevel frame")
+            },
+            &mut Level::Level { parent: _, ref mut frame, .. } => {
+                let access = frame.alloc_local(&mut self.temp, escapes);
+                Expression::Exp(frame.location_to_exp(access))
+            }
+        }
+    }
 }
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