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-rw-r--r--compiler/rustc_middle/src/mir/interpret/value.rs651
1 files changed, 651 insertions, 0 deletions
diff --git a/compiler/rustc_middle/src/mir/interpret/value.rs b/compiler/rustc_middle/src/mir/interpret/value.rs
new file mode 100644
index 000000000..834c114ee
--- /dev/null
+++ b/compiler/rustc_middle/src/mir/interpret/value.rs
@@ -0,0 +1,651 @@
+use std::convert::{TryFrom, TryInto};
+use std::fmt;
+
+use rustc_apfloat::{
+ ieee::{Double, Single},
+ Float,
+};
+use rustc_macros::HashStable;
+use rustc_target::abi::{HasDataLayout, Size};
+
+use crate::ty::{Lift, ParamEnv, ScalarInt, Ty, TyCtxt};
+
+use super::{
+ AllocId, AllocRange, ConstAllocation, InterpResult, Pointer, PointerArithmetic, Provenance,
+ ScalarSizeMismatch,
+};
+
+/// Represents the result of const evaluation via the `eval_to_allocation` query.
+#[derive(Copy, Clone, HashStable, TyEncodable, TyDecodable, Debug, Hash, Eq, PartialEq)]
+pub struct ConstAlloc<'tcx> {
+ // the value lives here, at offset 0, and that allocation definitely is an `AllocKind::Memory`
+ // (so you can use `AllocMap::unwrap_memory`).
+ pub alloc_id: AllocId,
+ pub ty: Ty<'tcx>,
+}
+
+/// Represents a constant value in Rust. `Scalar` and `Slice` are optimizations for
+/// array length computations, enum discriminants and the pattern matching logic.
+#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord, TyEncodable, TyDecodable, Hash)]
+#[derive(HashStable)]
+pub enum ConstValue<'tcx> {
+ /// Used only for types with `layout::abi::Scalar` ABI.
+ ///
+ /// Not using the enum `Value` to encode that this must not be `Uninit`.
+ Scalar(Scalar),
+
+ /// Only used for ZSTs.
+ ZeroSized,
+
+ /// Used only for `&[u8]` and `&str`
+ Slice { data: ConstAllocation<'tcx>, start: usize, end: usize },
+
+ /// A value not represented/representable by `Scalar` or `Slice`
+ ByRef {
+ /// The backing memory of the value, may contain more memory than needed for just the value
+ /// in order to share `ConstAllocation`s between values
+ alloc: ConstAllocation<'tcx>,
+ /// Offset into `alloc`
+ offset: Size,
+ },
+}
+
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
+static_assert_size!(ConstValue<'_>, 32);
+
+impl<'a, 'tcx> Lift<'tcx> for ConstValue<'a> {
+ type Lifted = ConstValue<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<ConstValue<'tcx>> {
+ Some(match self {
+ ConstValue::Scalar(s) => ConstValue::Scalar(s),
+ ConstValue::ZeroSized => ConstValue::ZeroSized,
+ ConstValue::Slice { data, start, end } => {
+ ConstValue::Slice { data: tcx.lift(data)?, start, end }
+ }
+ ConstValue::ByRef { alloc, offset } => {
+ ConstValue::ByRef { alloc: tcx.lift(alloc)?, offset }
+ }
+ })
+ }
+}
+
+impl<'tcx> ConstValue<'tcx> {
+ #[inline]
+ pub fn try_to_scalar(&self) -> Option<Scalar<AllocId>> {
+ match *self {
+ ConstValue::ByRef { .. } | ConstValue::Slice { .. } | ConstValue::ZeroSized => None,
+ ConstValue::Scalar(val) => Some(val),
+ }
+ }
+
+ pub fn try_to_scalar_int(&self) -> Option<ScalarInt> {
+ Some(self.try_to_scalar()?.assert_int())
+ }
+
+ pub fn try_to_bits(&self, size: Size) -> Option<u128> {
+ self.try_to_scalar_int()?.to_bits(size).ok()
+ }
+
+ pub fn try_to_bool(&self) -> Option<bool> {
+ self.try_to_scalar_int()?.try_into().ok()
+ }
+
+ pub fn try_to_machine_usize(&self, tcx: TyCtxt<'tcx>) -> Option<u64> {
+ self.try_to_scalar_int()?.try_to_machine_usize(tcx).ok()
+ }
+
+ pub fn try_to_bits_for_ty(
+ &self,
+ tcx: TyCtxt<'tcx>,
+ param_env: ParamEnv<'tcx>,
+ ty: Ty<'tcx>,
+ ) -> Option<u128> {
+ let size = tcx.layout_of(param_env.with_reveal_all_normalized(tcx).and(ty)).ok()?.size;
+ self.try_to_bits(size)
+ }
+
+ pub fn from_bool(b: bool) -> Self {
+ ConstValue::Scalar(Scalar::from_bool(b))
+ }
+
+ pub fn from_u64(i: u64) -> Self {
+ ConstValue::Scalar(Scalar::from_u64(i))
+ }
+
+ pub fn from_machine_usize(i: u64, cx: &impl HasDataLayout) -> Self {
+ ConstValue::Scalar(Scalar::from_machine_usize(i, cx))
+ }
+}
+
+/// A `Scalar` represents an immediate, primitive value existing outside of a
+/// `memory::Allocation`. It is in many ways like a small chunk of an `Allocation`, up to 16 bytes in
+/// size. Like a range of bytes in an `Allocation`, a `Scalar` can either represent the raw bytes
+/// of a simple value or a pointer into another `Allocation`
+///
+/// These variants would be private if there was a convenient way to achieve that in Rust.
+/// Do *not* match on a `Scalar`! Use the various `to_*` methods instead.
+#[derive(Clone, Copy, Eq, PartialEq, Ord, PartialOrd, TyEncodable, TyDecodable, Hash)]
+#[derive(HashStable)]
+pub enum Scalar<Prov = AllocId> {
+ /// The raw bytes of a simple value.
+ Int(ScalarInt),
+
+ /// A pointer into an `Allocation`. An `Allocation` in the `memory` module has a list of
+ /// relocations, but a `Scalar` is only large enough to contain one, so we just represent the
+ /// relocation and its associated offset together as a `Pointer` here.
+ ///
+ /// We also store the size of the pointer, such that a `Scalar` always knows how big it is.
+ /// The size is always the pointer size of the current target, but this is not information
+ /// that we always have readily available.
+ Ptr(Pointer<Prov>, u8),
+}
+
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
+static_assert_size!(Scalar, 24);
+
+// We want the `Debug` output to be readable as it is used by `derive(Debug)` for
+// all the Miri types.
+impl<Prov: Provenance> fmt::Debug for Scalar<Prov> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ match self {
+ Scalar::Ptr(ptr, _size) => write!(f, "{:?}", ptr),
+ Scalar::Int(int) => write!(f, "{:?}", int),
+ }
+ }
+}
+
+impl<Prov: Provenance> fmt::Display for Scalar<Prov> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ match self {
+ Scalar::Ptr(ptr, _size) => write!(f, "pointer to {:?}", ptr),
+ Scalar::Int(int) => write!(f, "{}", int),
+ }
+ }
+}
+
+impl<Prov: Provenance> fmt::LowerHex for Scalar<Prov> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ match self {
+ Scalar::Ptr(ptr, _size) => write!(f, "pointer to {:?}", ptr),
+ Scalar::Int(int) => write!(f, "{:#x}", int),
+ }
+ }
+}
+
+impl<Prov> From<Single> for Scalar<Prov> {
+ #[inline(always)]
+ fn from(f: Single) -> Self {
+ Scalar::from_f32(f)
+ }
+}
+
+impl<Prov> From<Double> for Scalar<Prov> {
+ #[inline(always)]
+ fn from(f: Double) -> Self {
+ Scalar::from_f64(f)
+ }
+}
+
+impl<Prov> From<ScalarInt> for Scalar<Prov> {
+ #[inline(always)]
+ fn from(ptr: ScalarInt) -> Self {
+ Scalar::Int(ptr)
+ }
+}
+
+impl<Prov> Scalar<Prov> {
+ #[inline(always)]
+ pub fn from_pointer(ptr: Pointer<Prov>, cx: &impl HasDataLayout) -> Self {
+ Scalar::Ptr(ptr, u8::try_from(cx.pointer_size().bytes()).unwrap())
+ }
+
+ /// Create a Scalar from a pointer with an `Option<_>` provenance (where `None` represents a
+ /// plain integer / "invalid" pointer).
+ pub fn from_maybe_pointer(ptr: Pointer<Option<Prov>>, cx: &impl HasDataLayout) -> Self {
+ match ptr.into_parts() {
+ (Some(prov), offset) => Scalar::from_pointer(Pointer::new(prov, offset), cx),
+ (None, offset) => {
+ Scalar::Int(ScalarInt::try_from_uint(offset.bytes(), cx.pointer_size()).unwrap())
+ }
+ }
+ }
+
+ #[inline]
+ pub fn null_ptr(cx: &impl HasDataLayout) -> Self {
+ Scalar::Int(ScalarInt::null(cx.pointer_size()))
+ }
+
+ #[inline]
+ pub fn from_bool(b: bool) -> Self {
+ Scalar::Int(b.into())
+ }
+
+ #[inline]
+ pub fn from_char(c: char) -> Self {
+ Scalar::Int(c.into())
+ }
+
+ #[inline]
+ pub fn try_from_uint(i: impl Into<u128>, size: Size) -> Option<Self> {
+ ScalarInt::try_from_uint(i, size).map(Scalar::Int)
+ }
+
+ #[inline]
+ pub fn from_uint(i: impl Into<u128>, size: Size) -> Self {
+ let i = i.into();
+ Self::try_from_uint(i, size)
+ .unwrap_or_else(|| bug!("Unsigned value {:#x} does not fit in {} bits", i, size.bits()))
+ }
+
+ #[inline]
+ pub fn from_u8(i: u8) -> Self {
+ Scalar::Int(i.into())
+ }
+
+ #[inline]
+ pub fn from_u16(i: u16) -> Self {
+ Scalar::Int(i.into())
+ }
+
+ #[inline]
+ pub fn from_u32(i: u32) -> Self {
+ Scalar::Int(i.into())
+ }
+
+ #[inline]
+ pub fn from_u64(i: u64) -> Self {
+ Scalar::Int(i.into())
+ }
+
+ #[inline]
+ pub fn from_machine_usize(i: u64, cx: &impl HasDataLayout) -> Self {
+ Self::from_uint(i, cx.data_layout().pointer_size)
+ }
+
+ #[inline]
+ pub fn try_from_int(i: impl Into<i128>, size: Size) -> Option<Self> {
+ ScalarInt::try_from_int(i, size).map(Scalar::Int)
+ }
+
+ #[inline]
+ pub fn from_int(i: impl Into<i128>, size: Size) -> Self {
+ let i = i.into();
+ Self::try_from_int(i, size)
+ .unwrap_or_else(|| bug!("Signed value {:#x} does not fit in {} bits", i, size.bits()))
+ }
+
+ #[inline]
+ pub fn from_i32(i: i32) -> Self {
+ Self::from_int(i, Size::from_bits(32))
+ }
+
+ #[inline]
+ pub fn from_i64(i: i64) -> Self {
+ Self::from_int(i, Size::from_bits(64))
+ }
+
+ #[inline]
+ pub fn from_machine_isize(i: i64, cx: &impl HasDataLayout) -> Self {
+ Self::from_int(i, cx.data_layout().pointer_size)
+ }
+
+ #[inline]
+ pub fn from_f32(f: Single) -> Self {
+ Scalar::Int(f.into())
+ }
+
+ #[inline]
+ pub fn from_f64(f: Double) -> Self {
+ Scalar::Int(f.into())
+ }
+
+ /// This is almost certainly not the method you want! You should dispatch on the type
+ /// and use `to_{u8,u16,...}`/`scalar_to_ptr` to perform ptr-to-int / int-to-ptr casts as needed.
+ ///
+ /// This method only exists for the benefit of low-level operations that truly need to treat the
+ /// scalar in whatever form it is.
+ ///
+ /// This throws UB (instead of ICEing) on a size mismatch since size mismatches can arise in
+ /// Miri when someone declares a function that we shim (such as `malloc`) with a wrong type.
+ #[inline]
+ pub fn to_bits_or_ptr_internal(
+ self,
+ target_size: Size,
+ ) -> Result<Result<u128, Pointer<Prov>>, ScalarSizeMismatch> {
+ assert_ne!(target_size.bytes(), 0, "you should never look at the bits of a ZST");
+ Ok(match self {
+ Scalar::Int(int) => Ok(int.to_bits(target_size).map_err(|size| {
+ ScalarSizeMismatch { target_size: target_size.bytes(), data_size: size.bytes() }
+ })?),
+ Scalar::Ptr(ptr, sz) => {
+ if target_size.bytes() != u64::from(sz) {
+ return Err(ScalarSizeMismatch {
+ target_size: target_size.bytes(),
+ data_size: sz.into(),
+ });
+ }
+ Err(ptr)
+ }
+ })
+ }
+}
+
+impl<'tcx, Prov: Provenance> Scalar<Prov> {
+ pub fn to_pointer(self, cx: &impl HasDataLayout) -> InterpResult<'tcx, Pointer<Option<Prov>>> {
+ match self
+ .to_bits_or_ptr_internal(cx.pointer_size())
+ .map_err(|s| err_ub!(ScalarSizeMismatch(s)))?
+ {
+ Err(ptr) => Ok(ptr.into()),
+ Ok(bits) => {
+ let addr = u64::try_from(bits).unwrap();
+ Ok(Pointer::from_addr(addr))
+ }
+ }
+ }
+
+ /// Fundamental scalar-to-int (cast) operation. Many convenience wrappers exist below, that you
+ /// likely want to use instead.
+ ///
+ /// Will perform ptr-to-int casts if needed and possible.
+ /// If that fails, we know the offset is relative, so we return an "erased" Scalar
+ /// (which is useful for error messages but not much else).
+ #[inline]
+ pub fn try_to_int(self) -> Result<ScalarInt, Scalar<AllocId>> {
+ match self {
+ Scalar::Int(int) => Ok(int),
+ Scalar::Ptr(ptr, sz) => {
+ if Prov::OFFSET_IS_ADDR {
+ Ok(ScalarInt::try_from_uint(ptr.offset.bytes(), Size::from_bytes(sz)).unwrap())
+ } else {
+ // We know `offset` is relative, since `OFFSET_IS_ADDR == false`.
+ let (prov, offset) = ptr.into_parts();
+ // Because `OFFSET_IS_ADDR == false`, this unwrap can never fail.
+ Err(Scalar::Ptr(Pointer::new(prov.get_alloc_id().unwrap(), offset), sz))
+ }
+ }
+ }
+ }
+
+ #[inline(always)]
+ pub fn assert_int(self) -> ScalarInt {
+ self.try_to_int().unwrap()
+ }
+
+ /// This throws UB (instead of ICEing) on a size mismatch since size mismatches can arise in
+ /// Miri when someone declares a function that we shim (such as `malloc`) with a wrong type.
+ #[inline]
+ pub fn to_bits(self, target_size: Size) -> InterpResult<'tcx, u128> {
+ assert_ne!(target_size.bytes(), 0, "you should never look at the bits of a ZST");
+ self.try_to_int().map_err(|_| err_unsup!(ReadPointerAsBytes))?.to_bits(target_size).map_err(
+ |size| {
+ err_ub!(ScalarSizeMismatch(ScalarSizeMismatch {
+ target_size: target_size.bytes(),
+ data_size: size.bytes(),
+ }))
+ .into()
+ },
+ )
+ }
+
+ #[inline(always)]
+ pub fn assert_bits(self, target_size: Size) -> u128 {
+ self.to_bits(target_size).unwrap()
+ }
+
+ pub fn to_bool(self) -> InterpResult<'tcx, bool> {
+ let val = self.to_u8()?;
+ match val {
+ 0 => Ok(false),
+ 1 => Ok(true),
+ _ => throw_ub!(InvalidBool(val)),
+ }
+ }
+
+ pub fn to_char(self) -> InterpResult<'tcx, char> {
+ let val = self.to_u32()?;
+ match std::char::from_u32(val) {
+ Some(c) => Ok(c),
+ None => throw_ub!(InvalidChar(val)),
+ }
+ }
+
+ /// Converts the scalar to produce an unsigned integer of the given size.
+ /// Fails if the scalar is a pointer.
+ #[inline]
+ pub fn to_uint(self, size: Size) -> InterpResult<'tcx, u128> {
+ self.to_bits(size)
+ }
+
+ /// Converts the scalar to produce a `u8`. Fails if the scalar is a pointer.
+ pub fn to_u8(self) -> InterpResult<'tcx, u8> {
+ self.to_uint(Size::from_bits(8)).map(|v| u8::try_from(v).unwrap())
+ }
+
+ /// Converts the scalar to produce a `u16`. Fails if the scalar is a pointer.
+ pub fn to_u16(self) -> InterpResult<'tcx, u16> {
+ self.to_uint(Size::from_bits(16)).map(|v| u16::try_from(v).unwrap())
+ }
+
+ /// Converts the scalar to produce a `u32`. Fails if the scalar is a pointer.
+ pub fn to_u32(self) -> InterpResult<'tcx, u32> {
+ self.to_uint(Size::from_bits(32)).map(|v| u32::try_from(v).unwrap())
+ }
+
+ /// Converts the scalar to produce a `u64`. Fails if the scalar is a pointer.
+ pub fn to_u64(self) -> InterpResult<'tcx, u64> {
+ self.to_uint(Size::from_bits(64)).map(|v| u64::try_from(v).unwrap())
+ }
+
+ /// Converts the scalar to produce a `u128`. Fails if the scalar is a pointer.
+ pub fn to_u128(self) -> InterpResult<'tcx, u128> {
+ self.to_uint(Size::from_bits(128))
+ }
+
+ /// Converts the scalar to produce a machine-pointer-sized unsigned integer.
+ /// Fails if the scalar is a pointer.
+ pub fn to_machine_usize(self, cx: &impl HasDataLayout) -> InterpResult<'tcx, u64> {
+ let b = self.to_uint(cx.data_layout().pointer_size)?;
+ Ok(u64::try_from(b).unwrap())
+ }
+
+ /// Converts the scalar to produce a signed integer of the given size.
+ /// Fails if the scalar is a pointer.
+ #[inline]
+ pub fn to_int(self, size: Size) -> InterpResult<'tcx, i128> {
+ let b = self.to_bits(size)?;
+ Ok(size.sign_extend(b) as i128)
+ }
+
+ /// Converts the scalar to produce an `i8`. Fails if the scalar is a pointer.
+ pub fn to_i8(self) -> InterpResult<'tcx, i8> {
+ self.to_int(Size::from_bits(8)).map(|v| i8::try_from(v).unwrap())
+ }
+
+ /// Converts the scalar to produce an `i16`. Fails if the scalar is a pointer.
+ pub fn to_i16(self) -> InterpResult<'tcx, i16> {
+ self.to_int(Size::from_bits(16)).map(|v| i16::try_from(v).unwrap())
+ }
+
+ /// Converts the scalar to produce an `i32`. Fails if the scalar is a pointer.
+ pub fn to_i32(self) -> InterpResult<'tcx, i32> {
+ self.to_int(Size::from_bits(32)).map(|v| i32::try_from(v).unwrap())
+ }
+
+ /// Converts the scalar to produce an `i64`. Fails if the scalar is a pointer.
+ pub fn to_i64(self) -> InterpResult<'tcx, i64> {
+ self.to_int(Size::from_bits(64)).map(|v| i64::try_from(v).unwrap())
+ }
+
+ /// Converts the scalar to produce an `i128`. Fails if the scalar is a pointer.
+ pub fn to_i128(self) -> InterpResult<'tcx, i128> {
+ self.to_int(Size::from_bits(128))
+ }
+
+ /// Converts the scalar to produce a machine-pointer-sized signed integer.
+ /// Fails if the scalar is a pointer.
+ pub fn to_machine_isize(self, cx: &impl HasDataLayout) -> InterpResult<'tcx, i64> {
+ let b = self.to_int(cx.data_layout().pointer_size)?;
+ Ok(i64::try_from(b).unwrap())
+ }
+
+ #[inline]
+ pub fn to_f32(self) -> InterpResult<'tcx, Single> {
+ // Going through `u32` to check size and truncation.
+ Ok(Single::from_bits(self.to_u32()?.into()))
+ }
+
+ #[inline]
+ pub fn to_f64(self) -> InterpResult<'tcx, Double> {
+ // Going through `u64` to check size and truncation.
+ Ok(Double::from_bits(self.to_u64()?.into()))
+ }
+}
+
+#[derive(Clone, Copy, Eq, PartialEq, TyEncodable, TyDecodable, HashStable, Hash)]
+pub enum ScalarMaybeUninit<Prov = AllocId> {
+ Scalar(Scalar<Prov>),
+ Uninit,
+}
+
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
+static_assert_size!(ScalarMaybeUninit, 24);
+
+impl<Prov> From<Scalar<Prov>> for ScalarMaybeUninit<Prov> {
+ #[inline(always)]
+ fn from(s: Scalar<Prov>) -> Self {
+ ScalarMaybeUninit::Scalar(s)
+ }
+}
+
+// We want the `Debug` output to be readable as it is used by `derive(Debug)` for
+// all the Miri types.
+impl<Prov: Provenance> fmt::Debug for ScalarMaybeUninit<Prov> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ match self {
+ ScalarMaybeUninit::Uninit => write!(f, "<uninitialized>"),
+ ScalarMaybeUninit::Scalar(s) => write!(f, "{:?}", s),
+ }
+ }
+}
+
+impl<Prov: Provenance> fmt::LowerHex for ScalarMaybeUninit<Prov> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ match self {
+ ScalarMaybeUninit::Uninit => write!(f, "uninitialized bytes"),
+ ScalarMaybeUninit::Scalar(s) => write!(f, "{:x}", s),
+ }
+ }
+}
+
+impl<Prov> ScalarMaybeUninit<Prov> {
+ #[inline]
+ pub fn from_pointer(ptr: Pointer<Prov>, cx: &impl HasDataLayout) -> Self {
+ ScalarMaybeUninit::Scalar(Scalar::from_pointer(ptr, cx))
+ }
+
+ #[inline]
+ pub fn from_maybe_pointer(ptr: Pointer<Option<Prov>>, cx: &impl HasDataLayout) -> Self {
+ ScalarMaybeUninit::Scalar(Scalar::from_maybe_pointer(ptr, cx))
+ }
+
+ #[inline]
+ pub fn check_init<'tcx>(self) -> InterpResult<'tcx, Scalar<Prov>> {
+ match self {
+ ScalarMaybeUninit::Scalar(scalar) => Ok(scalar),
+ ScalarMaybeUninit::Uninit => throw_ub!(InvalidUninitBytes(None)),
+ }
+ }
+}
+
+impl<'tcx, Prov: Provenance> ScalarMaybeUninit<Prov> {
+ #[inline(always)]
+ pub fn to_pointer(self, cx: &impl HasDataLayout) -> InterpResult<'tcx, Pointer<Option<Prov>>> {
+ self.check_init()?.to_pointer(cx)
+ }
+
+ #[inline(always)]
+ pub fn to_bool(self) -> InterpResult<'tcx, bool> {
+ self.check_init()?.to_bool()
+ }
+
+ #[inline(always)]
+ pub fn to_char(self) -> InterpResult<'tcx, char> {
+ self.check_init()?.to_char()
+ }
+
+ #[inline(always)]
+ pub fn to_f32(self) -> InterpResult<'tcx, Single> {
+ self.check_init()?.to_f32()
+ }
+
+ #[inline(always)]
+ pub fn to_f64(self) -> InterpResult<'tcx, Double> {
+ self.check_init()?.to_f64()
+ }
+
+ #[inline(always)]
+ pub fn to_u8(self) -> InterpResult<'tcx, u8> {
+ self.check_init()?.to_u8()
+ }
+
+ #[inline(always)]
+ pub fn to_u16(self) -> InterpResult<'tcx, u16> {
+ self.check_init()?.to_u16()
+ }
+
+ #[inline(always)]
+ pub fn to_u32(self) -> InterpResult<'tcx, u32> {
+ self.check_init()?.to_u32()
+ }
+
+ #[inline(always)]
+ pub fn to_u64(self) -> InterpResult<'tcx, u64> {
+ self.check_init()?.to_u64()
+ }
+
+ #[inline(always)]
+ pub fn to_machine_usize(self, cx: &impl HasDataLayout) -> InterpResult<'tcx, u64> {
+ self.check_init()?.to_machine_usize(cx)
+ }
+
+ #[inline(always)]
+ pub fn to_i8(self) -> InterpResult<'tcx, i8> {
+ self.check_init()?.to_i8()
+ }
+
+ #[inline(always)]
+ pub fn to_i16(self) -> InterpResult<'tcx, i16> {
+ self.check_init()?.to_i16()
+ }
+
+ #[inline(always)]
+ pub fn to_i32(self) -> InterpResult<'tcx, i32> {
+ self.check_init()?.to_i32()
+ }
+
+ #[inline(always)]
+ pub fn to_i64(self) -> InterpResult<'tcx, i64> {
+ self.check_init()?.to_i64()
+ }
+
+ #[inline(always)]
+ pub fn to_machine_isize(self, cx: &impl HasDataLayout) -> InterpResult<'tcx, i64> {
+ self.check_init()?.to_machine_isize(cx)
+ }
+}
+
+/// Gets the bytes of a constant slice value.
+pub fn get_slice_bytes<'tcx>(cx: &impl HasDataLayout, val: ConstValue<'tcx>) -> &'tcx [u8] {
+ if let ConstValue::Slice { data, start, end } = val {
+ let len = end - start;
+ data.inner()
+ .get_bytes(
+ cx,
+ AllocRange { start: Size::from_bytes(start), size: Size::from_bytes(len) },
+ )
+ .unwrap_or_else(|err| bug!("const slice is invalid: {:?}", err))
+ } else {
+ bug!("expected const slice, but found another const value");
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-12 09:07:18 +0000