From 4c6fd6e670264b01a84ee76e99e28d6be7789f1a Mon Sep 17 00:00:00 2001
From: David Li <li.davidm96@gmail.com>
Date: Tue, 7 Nov 2017 16:50:39 -0500
Subject: Add stub of frame module

---
 src/semantic/frame.rs | 44 ++++++++++++++++++++++++++++++++++++++++++++
 src/semantic/mod.rs   |  2 ++
 src/semantic/temp.rs  | 26 ++++++++++++++++++++++++++
 3 files changed, 72 insertions(+)
 create mode 100644 src/semantic/frame.rs
 create mode 100644 src/semantic/temp.rs

diff --git a/src/semantic/frame.rs b/src/semantic/frame.rs
new file mode 100644
index 0000000..ddfc330
--- /dev/null
+++ b/src/semantic/frame.rs
@@ -0,0 +1,44 @@
+use super::temp;
+
+pub enum Location {
+    InFrame {
+        offset: usize,
+    },
+    Register(temp::TempName),
+}
+
+pub enum Escape {
+    No,
+    Yes,
+}
+
+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;
+}
+
+pub struct Amd64Frame {
+    name: temp::TempLabel,
+}
+
+impl Frame for Amd64Frame {
+    fn new(name: temp::TempLabel, formals: Vec<Escape>) -> Self {
+        Amd64Frame {
+            name,
+        }
+    }
+
+    fn name(&self) -> temp::TempLabel {
+        self.name
+    }
+
+    fn formals(&self) -> &[Location] {
+        unimplemented!();
+    }
+
+    fn alloc_local(&mut self, escapes: Escape) -> Location {
+        unimplemented!();
+    }
+}
diff --git a/src/semantic/mod.rs b/src/semantic/mod.rs
index e2edc24..afc56ef 100644
--- a/src/semantic/mod.rs
+++ b/src/semantic/mod.rs
@@ -4,5 +4,7 @@
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 pub mod environment;
+pub mod frame;
+pub mod temp;
 pub mod translate;
 pub mod types;
diff --git a/src/semantic/temp.rs b/src/semantic/temp.rs
new file mode 100644
index 0000000..abd7e86
--- /dev/null
+++ b/src/semantic/temp.rs
@@ -0,0 +1,26 @@
+pub struct Temp {
+    counter: usize,
+}
+
+#[derive(Copy,Clone,Debug,Eq,PartialEq)]
+pub struct TempName(usize);
+#[derive(Copy,Clone,Debug,Eq,PartialEq)]
+pub struct TempLabel(usize);
+
+impl Temp {
+    pub fn new() -> Temp {
+        Temp { counter: 0 }
+    }
+
+    pub fn next_name(&mut self) -> TempName {
+        let idx = self.counter;
+        self.counter += 1;
+        TempName(idx)
+    }
+
+    pub fn next_label(&mut self) -> TempLabel {
+        let idx = self.counter;
+        self.counter += 1;
+        TempLabel(idx)
+    }
+}
-- 
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