Auto merge of #50967 - oli-obk:miri_api_refactor, r=eddyb

Miri api refactor

r? @eddyb

cc @Zoxc

based on #50916

src/librustc/ich/impls_ty.rs

@@ -394,10 +394,10 @@ for ::mir::interpret::ConstValue<'gcx> {
         mem::discriminant(self).hash_stable(hcx, hasher);
 
         match *self {
-            ByVal(val) => {
+            Scalar(val) => {
                 val.hash_stable(hcx, hasher);
             }
-            ByValPair(a, b) => {
+            ScalarPair(a, b) => {
                 a.hash_stable(hcx, hasher);
                 b.hash_stable(hcx, hasher);
             }
@@ -410,12 +410,12 @@ for ::mir::interpret::ConstValue<'gcx> {
 }
 
 impl_stable_hash_for!(enum mir::interpret::Value {
-    ByVal(v),
-    ByValPair(a, b),
+    Scalar(v),
+    ScalarPair(a, b),
     ByRef(ptr, align)
 });
 
-impl_stable_hash_for!(struct mir::interpret::MemoryPointer {
+impl_stable_hash_for!(struct mir::interpret::Pointer {
     alloc_id,
     offset
 });
@@ -473,13 +473,24 @@ impl_stable_hash_for!(enum ::syntax::ast::Mutability {
     Mutable
 });
 
-impl_stable_hash_for!(struct mir::interpret::Pointer{primval});
 
-impl_stable_hash_for!(enum mir::interpret::PrimVal {
-    Bytes(b),
-    Ptr(p),
-    Undef
-});
+impl<'a> HashStable<StableHashingContext<'a>>
+for ::mir::interpret::Scalar {
+    fn hash_stable<W: StableHasherResult>(&self,
+                                          hcx: &mut StableHashingContext<'a>,
+                                          hasher: &mut StableHasher<W>) {
+        use mir::interpret::Scalar::*;
+
+        mem::discriminant(self).hash_stable(hcx, hasher);
+        match *self {
+            Bits { bits, defined } => {
+                bits.hash_stable(hcx, hasher);
+                defined.hash_stable(hcx, hasher);
+            },
+            Ptr(ptr) => ptr.hash_stable(hcx, hasher),
+        }
+    }
+}
 
 impl_stable_hash_for!(struct ty::Const<'tcx> {
     ty,

src/librustc/lib.rs

@@ -68,6 +68,7 @@
 #![feature(trusted_len)]
 #![feature(catch_expr)]
 #![feature(test)]
+#![feature(in_band_lifetimes)]
 
 #![recursion_limit="512"]
 

src/librustc/mir/interpret/error.rs

@@ -5,7 +5,7 @@ use ty::{FnSig, Ty, layout};
 use ty::layout::{Size, Align};
 
 use super::{
-    MemoryPointer, Lock, AccessKind
+    Pointer, Lock, AccessKind
 };
 
 use backtrace::Backtrace;
@@ -38,15 +38,15 @@ pub enum EvalErrorKind<'tcx, O> {
     MachineError(String),
     FunctionPointerTyMismatch(FnSig<'tcx>, FnSig<'tcx>),
     NoMirFor(String),
-    UnterminatedCString(MemoryPointer),
+    UnterminatedCString(Pointer),
     DanglingPointerDeref,
     DoubleFree,
     InvalidMemoryAccess,
     InvalidFunctionPointer,
     InvalidBool,
     InvalidDiscriminant,
     PointerOutOfBounds {
-        ptr: MemoryPointer,
+        ptr: Pointer,
         access: bool,
         allocation_size: Size,
     },
@@ -76,26 +76,26 @@ pub enum EvalErrorKind<'tcx, O> {
         has: Align,
     },
     MemoryLockViolation {
-        ptr: MemoryPointer,
+        ptr: Pointer,
         len: u64,
         frame: usize,
         access: AccessKind,
         lock: Lock,
     },
     MemoryAcquireConflict {
-        ptr: MemoryPointer,
+        ptr: Pointer,
         len: u64,
         kind: AccessKind,
         lock: Lock,
     },
     InvalidMemoryLockRelease {
-        ptr: MemoryPointer,
+        ptr: Pointer,
         len: u64,
         frame: usize,
         lock: Lock,
     },
     DeallocatedLockedMemory {
-        ptr: MemoryPointer,
+        ptr: Pointer,
         lock: Lock,
     },
     ValidationFailure(String),

src/librustc/mir/interpret/mod.rs

@@ -10,7 +10,7 @@ mod value;
 
 pub use self::error::{EvalError, EvalResult, EvalErrorKind, AssertMessage};
 
-pub use self::value::{PrimVal, PrimValKind, Value, Pointer, ConstValue};
+pub use self::value::{Scalar, Value, ConstValue};
 
 use std::fmt;
 use mir;
@@ -110,42 +110,49 @@ impl<T: layout::HasDataLayout> PointerArithmetic for T {}
 
 
 #[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd, RustcEncodable, RustcDecodable, Hash)]
-pub struct MemoryPointer {
+pub struct Pointer {
     pub alloc_id: AllocId,
     pub offset: Size,
 }
 
-impl<'tcx> MemoryPointer {
+/// Produces a `Pointer` which points to the beginning of the Allocation
+impl From<AllocId> for Pointer {
+    fn from(alloc_id: AllocId) -> Self {
+        Pointer::new(alloc_id, Size::ZERO)
+    }
+}
+
+impl<'tcx> Pointer {
     pub fn new(alloc_id: AllocId, offset: Size) -> Self {
-        MemoryPointer { alloc_id, offset }
+        Pointer { alloc_id, offset }
     }
 
     pub(crate) fn wrapping_signed_offset<C: HasDataLayout>(self, i: i64, cx: C) -> Self {
-        MemoryPointer::new(
+        Pointer::new(
             self.alloc_id,
             Size::from_bytes(cx.data_layout().wrapping_signed_offset(self.offset.bytes(), i)),
         )
     }
 
     pub fn overflowing_signed_offset<C: HasDataLayout>(self, i: i128, cx: C) -> (Self, bool) {
         let (res, over) = cx.data_layout().overflowing_signed_offset(self.offset.bytes(), i);
-        (MemoryPointer::new(self.alloc_id, Size::from_bytes(res)), over)
+        (Pointer::new(self.alloc_id, Size::from_bytes(res)), over)
     }
 
     pub(crate) fn signed_offset<C: HasDataLayout>(self, i: i64, cx: C) -> EvalResult<'tcx, Self> {
-        Ok(MemoryPointer::new(
+        Ok(Pointer::new(
             self.alloc_id,
             Size::from_bytes(cx.data_layout().signed_offset(self.offset.bytes(), i)?),
         ))
     }
 
     pub fn overflowing_offset<C: HasDataLayout>(self, i: Size, cx: C) -> (Self, bool) {
         let (res, over) = cx.data_layout().overflowing_offset(self.offset.bytes(), i.bytes());
-        (MemoryPointer::new(self.alloc_id, Size::from_bytes(res)), over)
+        (Pointer::new(self.alloc_id, Size::from_bytes(res)), over)
     }
 
     pub fn offset<C: HasDataLayout>(self, i: Size, cx: C) -> EvalResult<'tcx, Self> {
-        Ok(MemoryPointer::new(
+        Ok(Pointer::new(
             self.alloc_id,
             Size::from_bytes(cx.data_layout().offset(self.offset.bytes(), i.bytes())?),
         ))
@@ -355,7 +362,7 @@ pub struct Allocation {
 
 impl Allocation {
     pub fn from_bytes(slice: &[u8], align: Align) -> Self {
-        let mut undef_mask = UndefMask::new(Size::from_bytes(0));
+        let mut undef_mask = UndefMask::new(Size::ZERO);
         undef_mask.grow(Size::from_bytes(slice.len() as u64), true);
         Self {
             bytes: slice.to_owned(),
@@ -467,7 +474,7 @@ impl UndefMask {
     pub fn new(size: Size) -> Self {
         let mut m = UndefMask {
             blocks: vec![],
-            len: Size::from_bytes(0),
+            len: Size::ZERO,
         };
         m.grow(size, false);
         m