bjoernager/rust
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Implement unary operators for integers.

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This commit is contained in:
Scott Olson 2015-11-12 17:24:43 -06:00
parent b099391aaf
commit 71f70e95ed
2 changed files with 37 additions and 19 deletions
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51
src/interpreter.rs
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@ -8,7 +8,7 @@ use syntax::attr::AttrMetaMethods;
enum Value {
Uninit,
Bool(bool),
Int(i64),
Int(i64), // FIXME: Should be bit-width aware.
}
struct Interpreter<'tcx> {
@ -58,32 +58,45 @@ impl<'tcx> Interpreter<'tcx> {
fn eval_rvalue(&mut self, rvalue: &mir::Rvalue) -> Value {
use rustc_mir::repr::Rvalue::*;
use rustc_mir::repr::BinOp::*;
use rustc_mir::repr::UnOp::*;
match *rvalue {
Use(ref operand) => self.eval_operand(operand),
BinaryOp(bin_op, ref left, ref right) => {
match (self.eval_operand(left), self.eval_operand(right)) {
(Value::Int(l), Value::Int(r)) => match bin_op {
Add => Value::Int(l + r),
Sub => Value::Int(l - r),
Mul => Value::Int(l * r),
Div => Value::Int(l / r),
Rem => Value::Int(l % r),
BitXor => Value::Int(l ^ r),
BitAnd => Value::Int(l & r),
BitOr => Value::Int(l | r),
Shl => Value::Int(l << r),
Shr => Value::Int(l >> r),
Eq => Value::Bool(l == r),
Lt => Value::Bool(l < r),
Le => Value::Bool(l <= r),
Ne => Value::Bool(l != r),
Ge => Value::Bool(l >= r),
Gt => Value::Bool(l > r),
},
(Value::Int(l), Value::Int(r)) => {
match bin_op {
Add => Value::Int(l + r),
Sub => Value::Int(l - r),
Mul => Value::Int(l * r),
Div => Value::Int(l / r),
Rem => Value::Int(l % r),
BitXor => Value::Int(l ^ r),
BitAnd => Value::Int(l & r),
BitOr => Value::Int(l | r),
Shl => Value::Int(l << r),
Shr => Value::Int(l >> r),
Eq => Value::Bool(l == r),
Lt => Value::Bool(l < r),
Le => Value::Bool(l <= r),
Ne => Value::Bool(l != r),
Ge => Value::Bool(l >= r),
Gt => Value::Bool(l > r),
}
}
_ => unimplemented!(),
}
}
UnaryOp(un_op, ref operand) => {
match (un_op, self.eval_operand(operand)) {
(Not, Value::Int(n)) => Value::Int(!n),
(Neg, Value::Int(n)) => Value::Int(-n),
_ => unimplemented!(),
}
}
_ => unimplemented!(),
}
}