Refactor PrimVal::bits() out of existence.

src/cast.rs

@@ -20,9 +20,9 @@ pub(super) fn cast_primval(
             F32 => self.cast_float(val.to_f32()? as f64, dest_ty),
             F64 => self.cast_float(val.to_f64()?, dest_ty),
 
-            I8 | I16 | I32 | I64 => self.cast_signed_int(val.bits() as i64, dest_ty),
+            I8 | I16 | I32 | I64 => self.cast_signed_int(val.to_i64()?, dest_ty),
 
-            Bool | Char | U8 | U16 | U32 | U64 => self.cast_int(val.bits(), dest_ty, false),
+            Bool | Char | U8 | U16 | U32 | U64 => self.cast_int(val.to_u64()?, dest_ty, false),
 
             FnPtr | Ptr => self.cast_ptr(val.to_ptr()?, dest_ty),
         }

src/eval_context.rs

@@ -1093,10 +1093,10 @@ pub(super) fn ty_to_primval_kind(&self, ty: Ty<'tcx>) -> EvalResult<'tcx, PrimVa
 
     fn ensure_valid_value(&self, val: PrimVal, ty: Ty<'tcx>) -> EvalResult<'tcx, ()> {
         match ty.sty {
-            ty::TyBool if val.bits() > 1 => Err(EvalError::InvalidBool),
+            ty::TyBool if val.to_bytes()? > 1 => Err(EvalError::InvalidBool),
 
-            ty::TyChar if ::std::char::from_u32(val.bits() as u32).is_none()
-                => Err(EvalError::InvalidChar(val.bits() as u32 as u64)),
+            ty::TyChar if ::std::char::from_u32(val.to_bytes()? as u32).is_none()
+                => Err(EvalError::InvalidChar(val.to_bytes()? as u32 as u64)),
 
             _ => Ok(()),
         }

src/memory.rs

@@ -77,8 +77,7 @@ pub fn points_to_zst(&self) -> bool {
 
     pub fn to_int<'tcx>(&self) -> EvalResult<'tcx, u64> {
         match self.alloc_id {
-            NEVER_ALLOC_ID |
-            ZST_ALLOC_ID => Ok(self.offset),
+            NEVER_ALLOC_ID => Ok(self.offset),
             _ => Err(EvalError::ReadPointerAsBytes),
         }
     }

src/operator.rs

@@ -139,16 +139,38 @@ pub fn binary_op<'tcx>(
     use rustc::mir::BinOp::*;
     use value::PrimValKind::*;
 
-    // If the pointers are into the same allocation, fall through to the more general match
-    // later, which will do comparisons on the `bits` fields, which are the pointer offsets
-    // in this case.
-    let left_ptr = left.to_ptr()?;
-    let right_ptr = right.to_ptr()?;
-    if left_ptr.alloc_id != right_ptr.alloc_id {
-        return Ok((unrelated_ptr_ops(bin_op, left_ptr, right_ptr)?, false));
+    // FIXME(solson): Temporary hack. It will go away when we get rid of Pointer's ability to store
+    // plain bytes, and leave that to PrimVal::Bytes.
+    fn normalize(val: PrimVal) -> PrimVal {
+        if let PrimVal::Ptr(ptr) = val {
+            if let Ok(bytes) = ptr.to_int() {
+                return PrimVal::Bytes(bytes);
+            }
+        }
+        val
     }
+    let (left, right) = (normalize(left), normalize(right));
+
+    let (l, r) = match (left, right) {
+        (PrimVal::Bytes(left_bytes), PrimVal::Bytes(right_bytes)) => (left_bytes, right_bytes),
+
+        (PrimVal::Ptr(left_ptr), PrimVal::Ptr(right_ptr)) => {
+            if left_ptr.alloc_id == right_ptr.alloc_id {
+                // If the pointers are into the same allocation, fall through to the more general
+                // match later, which will do comparisons on the pointer offsets.
+                (left_ptr.offset, right_ptr.offset)
+            } else {
+                return Ok((unrelated_ptr_ops(bin_op, left_ptr, right_ptr)?, false));
+            }
+        }
+
+        (PrimVal::Ptr(ptr), PrimVal::Bytes(bytes)) |
+        (PrimVal::Bytes(bytes), PrimVal::Ptr(ptr)) => {
+            return Ok((unrelated_ptr_ops(bin_op, ptr, Pointer::from_int(bytes))?, false));
+        }
 
-    let (l, r) = (left.bits(), right.bits());
+        (PrimVal::Undef, _) | (_, PrimVal::Undef) => return Err(EvalError::ReadUndefBytes),
+    };
 
     // These ops can have an RHS with a different numeric type.
     if bin_op == Shl || bin_op == Shr {
@@ -165,11 +187,11 @@ pub fn binary_op<'tcx>(
 
         // Cast to `u32` because `overflowing_sh{l,r}` only take `u32`, then apply the bitmask
         // to ensure it's within the valid shift value range.
-        let r = (right.bits() as u32) & (type_bits - 1);
+        let masked_shift_width = (r as u32) & (type_bits - 1);
 
         return match bin_op {
-            Shl => int_shift!(left_kind, overflowing_shl, l, r),
-            Shr => int_shift!(left_kind, overflowing_shr, l, r),
+            Shl => int_shift!(left_kind, overflowing_shl, l, masked_shift_width),
+            Shr => int_shift!(left_kind, overflowing_shr, l, masked_shift_width),
             _ => bug!("it has already been checked that this is a shift op"),
         };
     }
@@ -253,26 +275,28 @@ pub fn unary_op<'tcx>(
     use rustc::mir::UnOp::*;
     use value::PrimValKind::*;
 
-    let bits = match (un_op, val_kind) {
-        (Not, Bool) => !bits_to_bool(val.bits()) as u64,
+    let bytes = val.to_bytes()?;
+
+    let result_bytes = match (un_op, val_kind) {
+        (Not, Bool) => !bits_to_bool(bytes) as u64,
 
-        (Not, U8)  => !(val.bits() as u8) as u64,
-        (Not, U16) => !(val.bits() as u16) as u64,
-        (Not, U32) => !(val.bits() as u32) as u64,
-        (Not, U64) => !val.bits(),
+        (Not, U8)  => !(bytes as u8) as u64,
+        (Not, U16) => !(bytes as u16) as u64,
+        (Not, U32) => !(bytes as u32) as u64,
+        (Not, U64) => !bytes,
 
-        (Not, I8)  => !(val.bits() as i8) as u64,
-        (Not, I16) => !(val.bits() as i16) as u64,
-        (Not, I32) => !(val.bits() as i32) as u64,
-        (Not, I64) => !(val.bits() as i64) as u64,
+        (Not, I8)  => !(bytes as i8) as u64,
+        (Not, I16) => !(bytes as i16) as u64,
+        (Not, I32) => !(bytes as i32) as u64,
+        (Not, I64) => !(bytes as i64) as u64,
 
-        (Neg, I8)  => -(val.bits() as i8) as u64,
-        (Neg, I16) => -(val.bits() as i16) as u64,
-        (Neg, I32) => -(val.bits() as i32) as u64,
-        (Neg, I64) => -(val.bits() as i64) as u64,
+        (Neg, I8)  => -(bytes as i8) as u64,
+        (Neg, I16) => -(bytes as i16) as u64,
+        (Neg, I32) => -(bytes as i32) as u64,
+        (Neg, I64) => -(bytes as i64) as u64,
 
-        (Neg, F32) => f32_to_bits(-bits_to_f32(val.bits())),
-        (Neg, F64) => f64_to_bits(-bits_to_f64(val.bits())),
+        (Neg, F32) => f32_to_bits(-bits_to_f32(bytes)),
+        (Neg, F64) => f64_to_bits(-bits_to_f64(bytes)),
 
         _ => {
             let msg = format!("unimplemented unary op: {:?}, {:?}", un_op, val);
@@ -280,5 +304,5 @@ pub fn unary_op<'tcx>(
         }
     };
 
-    Ok(PrimVal::Bytes(bits))
+    Ok(PrimVal::Bytes(result_bytes))
 }

src/terminator/intrinsic.rs

@@ -163,7 +163,7 @@ pub(super) fn call_intrinsic(
                 let ty = substs.type_at(0);
                 let num = self.value_to_primval(arg_vals[0], ty)?;
                 let kind = self.ty_to_primval_kind(ty)?;
-                let num = numeric_intrinsic(intrinsic_name, num, kind);
+                let num = numeric_intrinsic(intrinsic_name, num, kind)?;
                 self.write_primval(dest, num, ty)?;
             }
 
@@ -501,33 +501,40 @@ fn field_ty(
     }
 }
 
-macro_rules! integer_intrinsic {
-    ($name:expr, $val:expr, $kind:expr, $method:ident) => ({
-        let val = $val;
-
-        use value::PrimValKind::*;
-        let bits = match $kind {
-            I8 => (val.bits() as i8).$method() as u64,
-            U8 => (val.bits() as u8).$method() as u64,
-            I16 => (val.bits() as i16).$method() as u64,
-            U16 => (val.bits() as u16).$method() as u64,
-            I32 => (val.bits() as i32).$method() as u64,
-            U32 => (val.bits() as u32).$method() as u64,
-            I64 => (val.bits() as i64).$method() as u64,
-            U64 => (val.bits() as u64).$method() as u64,
-            _ => bug!("invalid `{}` argument: {:?}", $name, val),
-        };
-
-        PrimVal::Bytes(bits)
-    });
-}
+fn numeric_intrinsic<'tcx>(
+    name: &str,
+    val: PrimVal,
+    kind: PrimValKind
+) -> EvalResult<'tcx, PrimVal> {
+    macro_rules! integer_intrinsic {
+        ($name:expr, $val:expr, $kind:expr, $method:ident) => ({
+            let val = $val;
+            let bytes = val.to_bytes()?;
+
+            use value::PrimValKind::*;
+            let result_bytes = match $kind {
+                I8 => (bytes as i8).$method() as u64,
+                U8 => (bytes as u8).$method() as u64,
+                I16 => (bytes as i16).$method() as u64,
+                U16 => (bytes as u16).$method() as u64,
+                I32 => (bytes as i32).$method() as u64,
+                U32 => (bytes as u32).$method() as u64,
+                I64 => (bytes as i64).$method() as u64,
+                U64 => bytes.$method() as u64,
+                _ => bug!("invalid `{}` argument: {:?}", $name, val),
+            };
+
+            PrimVal::Bytes(result_bytes)
+        });
+    }
 
-fn numeric_intrinsic(name: &str, val: PrimVal, kind: PrimValKind) -> PrimVal {
-    match name {
+    let result_val = match name {
         "bswap" => integer_intrinsic!("bswap", val, kind, swap_bytes),
         "ctlz"  => integer_intrinsic!("ctlz",  val, kind, leading_zeros),
         "ctpop" => integer_intrinsic!("ctpop", val, kind, count_ones),
         "cttz"  => integer_intrinsic!("cttz",  val, kind, trailing_zeros),
         _       => bug!("not a numeric intrinsic: {}", name),
-    }
+    };
+
+    Ok(result_val)
 }

src/terminator/mod.rs

@@ -53,7 +53,7 @@ pub(super) fn eval_terminator(
                 for (index, const_val) in values.iter().enumerate() {
                     let val = self.const_to_value(const_val)?;
                     let prim = self.value_to_primval(val, discr_ty)?;
-                    if discr_prim.bits() == prim.bits() {
+                    if discr_prim.to_bytes()? == prim.to_bytes()? {
                         target_block = targets[index];
                         break;
                     }

src/value.rs

@@ -117,16 +117,6 @@ pub(super) fn expect_slice(&self, mem: &Memory<'a, 'tcx>) -> EvalResult<'tcx, (P
 }
 
 impl<'tcx> PrimVal {
-    // FIXME(solson): Remove this. It's a temporary function to aid refactoring, but it shouldn't
-    // stick around with this name.
-    pub fn bits(self) -> u64 {
-        match self {
-            PrimVal::Bytes(b) => b,
-            PrimVal::Ptr(p) => p.offset,
-            PrimVal::Undef => panic!(".bits()() on PrimVal::Undef"),
-        }
-    }
-
     pub fn from_u64(n: u64) -> Self {
         PrimVal::Bytes(n)
     }
@@ -151,7 +141,7 @@ pub fn from_char(c: char) -> Self {
         PrimVal::Bytes(c as u64)
     }
 
-    fn to_bytes(self) -> EvalResult<'tcx, u64> {
+    pub fn to_bytes(self) -> EvalResult<'tcx, u64> {
         match self {
             PrimVal::Bytes(b) => Ok(b),
             PrimVal::Ptr(p) => p.to_int(),