Rename term to object

src/main.rs

@@ -2,7 +2,7 @@ struct VM<'p> {
     program: &'p Program, 
     block: u32, ip: u32, 
     heap: Heap<'p>,
-    locals: Term,
+    locals: Object,
     stack: Vec<StackItem>, 
     status: Status 
 }
@@ -17,12 +17,12 @@ enum Status {
 
 #[derive(Clone, Copy, Debug)]
 enum StackItem {
-    Term(Term),
+    Object(Object),
     Integer(u32),
 }
 impl StackItem {
-    fn term(self) -> Option<Term> {
-        if let StackItem::Term(t) = self { return Some(t) }
+    fn object(self) -> Option<Object> {
+        if let StackItem::Object(t) = self { return Some(t) }
         return None
     }
     
@@ -33,7 +33,7 @@ impl StackItem {
 }
 
 #[derive(Clone, Copy, Debug)]
-struct Term { index: u32 }  
+struct Object { index: u32 }  
 struct Program { 
     blocks: Vec<BlockData>,
     types: Vec<TypeData>,
@@ -49,7 +49,7 @@ enum Instruction {
     // push an integer to the stack
     PushInteger(u32),
 
-    // push a new term to the stack with the given type
+    // push a new object to the stack with the given type
     PushNew(Type),
 
     // get the locals register
@@ -79,7 +79,7 @@ enum Op11 { Get(u32) }
 enum Op21 { Add, Set(u32) }
 
 const TY_NULL: Type = Type { id: 0x0 };
-const NULL: Term = Term { index: 0 };
+const NULL: Object = Object { index: 0 };
 
 const SYSCALL_DBG: u32 = 0x1000;
 
@@ -160,7 +160,7 @@ fn host_program(p: &Program) -> Result<(), String> {
 
 impl<'p> VM<'p> {
     pub fn start(program: &'p Program) -> VM<'p> {
-        let mut heap = Heap::new(program);
+        let heap = Heap::new(program);
 
         VM {
             program,
@@ -193,7 +193,7 @@ impl<'p> VM<'p> {
 
         match instruction {
             &Instruction::PushNull => {
-                self.stack.push(StackItem::Term(NULL))
+                self.stack.push(StackItem::Object(NULL))
             }
 
             &Instruction::PushInteger(int) => {
@@ -201,16 +201,16 @@ impl<'p> VM<'p> {
             }
 
             &Instruction::PushNew(ty) => {
-                let t = self.heap.term_create(ty);
-                self.stack.push(StackItem::Term(t))
+                let t = self.heap.object_create(ty);
+                self.stack.push(StackItem::Object(t))
             }
 
             Instruction::PushLocals => {
-                self.stack.push(StackItem::Term(self.locals))
+                self.stack.push(StackItem::Object(self.locals))
             }
             
             Instruction::PopLocals => {
-                let t0 = self.stack.pop().ok_or("t0 must be present")?.term().ok_or("t0 must be a term")?;
+                let t0 = self.stack.pop().ok_or("t0 must be present")?.object().ok_or("t0 must be a object")?;
                 self.locals = t0;
             }
 
@@ -267,8 +267,8 @@ impl Op11 {
     fn perform(&self, heap: &mut Heap, v0: StackItem) -> Result<StackItem, &'static str> {
         match self {
             &Op11::Get(ix) => {
-                let t0 = v0.term().ok_or("must be a term")?;
-                Ok(heap.term_get_arg(t0, ix))
+                let t0 = v0.object().ok_or("must be a object")?;
+                Ok(heap.object_get_arg(t0, ix))
             }
        }
     }
@@ -284,8 +284,8 @@ impl Op21 {
                 Ok(StackItem::Integer(i0.wrapping_add(i1)))
             }
             &Op21::Set(ix) => {
-                let t0 = v0.term().ok_or("must be a term")?;
-                heap.term_set_arg(t0, ix, v1);
+                let t0 = v0.object().ok_or("must be a object")?;
+                heap.object_set_arg(t0, ix, v1);
                 Ok(v0)
             }
         }
@@ -347,23 +347,23 @@ impl<'p> Heap<'p> {
             program: p,
             data: vec![],
         };
-        let null = h.term_create(TY_NULL);
+        let null = h.object_create(TY_NULL);
         assert_eq!(NULL.index, null.index);
         h
     }
 
-    fn term_create(&mut self, ty: Type) -> Term {
+    fn object_create(&mut self, ty: Type) -> Object {
         let td = self.program.type_get(ty);
         let index = self.data.len() as u32;
         self.data.push(HeapItem::Type(ty));
         for _ in 0..td.len {
-            self.data.push(HeapItem::StackItem(StackItem::Term(NULL)));
+            self.data.push(HeapItem::StackItem(StackItem::Object(NULL)));
         }
-        Term { index }
+        Object { index }
     }
 
-    fn term_get_type(&self, term: Term) -> Type {
-        let header = self.data.get(term.index as usize).expect("term should have been valid");
+    fn object_get_type(&self, object: Object) -> Type {
+        let header = self.data.get(object.index as usize).expect("object should have been valid");
         if let &HeapItem::Type(ty) = header {
             ty
         } else {
@@ -371,12 +371,12 @@ impl<'p> Heap<'p> {
         }
     }
 
-    fn term_get_arg(&self, term: Term, ix: u32) -> StackItem {
-        let ty = self.term_get_type(term);
+    fn object_get_arg(&self, object: Object, ix: u32) -> StackItem {
+        let ty = self.object_get_type(object);
         let td = self.program.type_get(ty);
 
         if ix < td.len {
-            let value = self.data.get((term.index + ix + 1) as usize).expect("should have been present");
+            let value = self.data.get((object.index + ix + 1) as usize).expect("should have been present");
             match value {
                 &HeapItem::StackItem(si) => si,
                 _ => panic!("should have been a StackItem")
@@ -386,12 +386,12 @@ impl<'p> Heap<'p> {
         }
     }
 
-    fn term_set_arg(&mut self, term: Term, ix: u32, arg: StackItem) {
-        let ty = self.term_get_type(term);
+    fn object_set_arg(&mut self, object: Object, ix: u32, arg: StackItem) {
+        let ty = self.object_get_type(object);
         let td = self.program.type_get(ty);
 
         if ix < td.len {
-            let slot = self.data.get_mut((term.index + ix + 1) as usize).expect("should have been present");
+            let slot = self.data.get_mut((object.index + ix + 1) as usize).expect("should have been present");
             *slot = HeapItem::StackItem(arg)
         } else {
             panic!("invalid ix: {}", ix)