| use std::convert::TryFrom; |
| use std::fmt; |
| |
| use rustc_apfloat::{ |
| ieee::{Double, Single}, |
| Float, |
| }; |
| use rustc_macros::HashStable; |
| use rustc_target::abi::TargetDataLayout; |
| |
| use crate::ty::{ |
| layout::{HasDataLayout, Size}, |
| ParamEnv, Ty, TyCtxt, |
| }; |
| |
| use super::{sign_extend, truncate, AllocId, Allocation, InterpResult, Pointer, PointerArithmetic}; |
| |
| /// Represents the result of a raw const operation, pre-validation. |
| #[derive(Clone, HashStable)] |
| pub struct RawConst<'tcx> { |
| // the value lives here, at offset 0, and that allocation definitely is a `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, RustcEncodable, RustcDecodable, Hash)] |
| #[derive(HashStable)] |
| pub enum ConstValue<'tcx> { |
| /// Used only for types with `layout::abi::Scalar` ABI and ZSTs. |
| /// |
| /// Not using the enum `Value` to encode that this must not be `Undef`. |
| Scalar(Scalar), |
| |
| /// Used only for `&[u8]` and `&str` |
| Slice { data: &'tcx Allocation, 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 `Allocation`s between values |
| alloc: &'tcx Allocation, |
| /// Offset into `alloc` |
| offset: Size, |
| }, |
| } |
| |
| #[cfg(target_arch = "x86_64")] |
| static_assert_size!(ConstValue<'_>, 32); |
| |
| impl<'tcx> ConstValue<'tcx> { |
| #[inline] |
| pub fn try_to_scalar(&self) -> Option<Scalar> { |
| match *self { |
| ConstValue::ByRef { .. } | ConstValue::Slice { .. } => None, |
| ConstValue::Scalar(val) => Some(val), |
| } |
| } |
| |
| pub fn try_to_bits(&self, size: Size) -> Option<u128> { |
| self.try_to_scalar()?.to_bits(size).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().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 a `Allocation`, up to 8 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` |
| #[derive(Clone, Copy, Eq, PartialEq, Ord, PartialOrd, RustcEncodable, RustcDecodable, Hash)] |
| #[derive(HashStable)] |
| pub enum Scalar<Tag = (), Id = AllocId> { |
| /// The raw bytes of a simple value. |
| Raw { |
| /// The first `size` bytes of `data` are the value. |
| /// Do not try to read less or more bytes than that. The remaining bytes must be 0. |
| data: u128, |
| size: u8, |
| }, |
| |
| /// 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. |
| Ptr(Pointer<Tag, Id>), |
| } |
| |
| #[cfg(target_arch = "x86_64")] |
| static_assert_size!(Scalar, 24); |
| |
| impl<Tag: fmt::Debug, Id: fmt::Debug> fmt::Debug for Scalar<Tag, Id> { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| match self { |
| Scalar::Ptr(ptr) => write!(f, "{:?}", ptr), |
| &Scalar::Raw { data, size } => { |
| Scalar::check_data(data, size); |
| if size == 0 { |
| write!(f, "<ZST>") |
| } else { |
| // Format as hex number wide enough to fit any value of the given `size`. |
| // So data=20, size=1 will be "0x14", but with size=4 it'll be "0x00000014". |
| write!(f, "0x{:>0width$x}", data, width = (size * 2) as usize) |
| } |
| } |
| } |
| } |
| } |
| |
| impl<Tag> fmt::Display for Scalar<Tag> { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| match self { |
| Scalar::Ptr(_) => write!(f, "a pointer"), |
| Scalar::Raw { data, .. } => write!(f, "{}", data), |
| } |
| } |
| } |
| |
| impl<Tag> From<Single> for Scalar<Tag> { |
| #[inline(always)] |
| fn from(f: Single) -> Self { |
| Scalar::from_f32(f) |
| } |
| } |
| |
| impl<Tag> From<Double> for Scalar<Tag> { |
| #[inline(always)] |
| fn from(f: Double) -> Self { |
| Scalar::from_f64(f) |
| } |
| } |
| |
| impl Scalar<()> { |
| /// Make sure the `data` fits in `size`. |
| /// This is guaranteed by all constructors here, but since the enum variants are public, |
| /// it could still be violated (even though no code outside this file should |
| /// construct `Scalar`s). |
| #[inline(always)] |
| fn check_data(data: u128, size: u8) { |
| debug_assert_eq!( |
| truncate(data, Size::from_bytes(u64::from(size))), |
| data, |
| "Scalar value {:#x} exceeds size of {} bytes", |
| data, |
| size |
| ); |
| } |
| |
| /// Tag this scalar with `new_tag` if it is a pointer, leave it unchanged otherwise. |
| /// |
| /// Used by `MemPlace::replace_tag`. |
| #[inline] |
| pub fn with_tag<Tag>(self, new_tag: Tag) -> Scalar<Tag> { |
| match self { |
| Scalar::Ptr(ptr) => Scalar::Ptr(ptr.with_tag(new_tag)), |
| Scalar::Raw { data, size } => Scalar::Raw { data, size }, |
| } |
| } |
| } |
| |
| impl<'tcx, Tag> Scalar<Tag> { |
| /// Erase the tag from the scalar, if any. |
| /// |
| /// Used by error reporting code to avoid having the error type depend on `Tag`. |
| #[inline] |
| pub fn erase_tag(self) -> Scalar { |
| match self { |
| Scalar::Ptr(ptr) => Scalar::Ptr(ptr.erase_tag()), |
| Scalar::Raw { data, size } => Scalar::Raw { data, size }, |
| } |
| } |
| |
| #[inline] |
| pub fn null_ptr(cx: &impl HasDataLayout) -> Self { |
| Scalar::Raw { data: 0, size: cx.data_layout().pointer_size.bytes() as u8 } |
| } |
| |
| #[inline] |
| pub fn zst() -> Self { |
| Scalar::Raw { data: 0, size: 0 } |
| } |
| |
| #[inline(always)] |
| fn ptr_op( |
| self, |
| dl: &TargetDataLayout, |
| f_int: impl FnOnce(u64) -> InterpResult<'tcx, u64>, |
| f_ptr: impl FnOnce(Pointer<Tag>) -> InterpResult<'tcx, Pointer<Tag>>, |
| ) -> InterpResult<'tcx, Self> { |
| match self { |
| Scalar::Raw { data, size } => { |
| assert_eq!(u64::from(size), dl.pointer_size.bytes()); |
| Ok(Scalar::Raw { data: u128::from(f_int(u64::try_from(data).unwrap())?), size }) |
| } |
| Scalar::Ptr(ptr) => Ok(Scalar::Ptr(f_ptr(ptr)?)), |
| } |
| } |
| |
| #[inline] |
| pub fn ptr_offset(self, i: Size, cx: &impl HasDataLayout) -> InterpResult<'tcx, Self> { |
| let dl = cx.data_layout(); |
| self.ptr_op(dl, |int| dl.offset(int, i.bytes()), |ptr| ptr.offset(i, dl)) |
| } |
| |
| #[inline] |
| pub fn ptr_wrapping_offset(self, i: Size, cx: &impl HasDataLayout) -> Self { |
| let dl = cx.data_layout(); |
| self.ptr_op( |
| dl, |
| |int| Ok(dl.overflowing_offset(int, i.bytes()).0), |
| |ptr| Ok(ptr.wrapping_offset(i, dl)), |
| ) |
| .unwrap() |
| } |
| |
| #[inline] |
| pub fn ptr_signed_offset(self, i: i64, cx: &impl HasDataLayout) -> InterpResult<'tcx, Self> { |
| let dl = cx.data_layout(); |
| self.ptr_op(dl, |int| dl.signed_offset(int, i), |ptr| ptr.signed_offset(i, dl)) |
| } |
| |
| #[inline] |
| pub fn ptr_wrapping_signed_offset(self, i: i64, cx: &impl HasDataLayout) -> Self { |
| let dl = cx.data_layout(); |
| self.ptr_op( |
| dl, |
| |int| Ok(dl.overflowing_signed_offset(int, i).0), |
| |ptr| Ok(ptr.wrapping_signed_offset(i, dl)), |
| ) |
| .unwrap() |
| } |
| |
| #[inline] |
| pub fn from_bool(b: bool) -> Self { |
| // Guaranteed to be truncated and does not need sign extension. |
| Scalar::Raw { data: b as u128, size: 1 } |
| } |
| |
| #[inline] |
| pub fn from_char(c: char) -> Self { |
| // Guaranteed to be truncated and does not need sign extension. |
| Scalar::Raw { data: c as u128, size: 4 } |
| } |
| |
| #[inline] |
| pub fn try_from_uint(i: impl Into<u128>, size: Size) -> Option<Self> { |
| let i = i.into(); |
| if truncate(i, size) == i { |
| Some(Scalar::Raw { data: i, size: size.bytes() as u8 }) |
| } else { |
| None |
| } |
| } |
| |
| #[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 { |
| // Guaranteed to be truncated and does not need sign extension. |
| Scalar::Raw { data: i.into(), size: 1 } |
| } |
| |
| #[inline] |
| pub fn from_u16(i: u16) -> Self { |
| // Guaranteed to be truncated and does not need sign extension. |
| Scalar::Raw { data: i.into(), size: 2 } |
| } |
| |
| #[inline] |
| pub fn from_u32(i: u32) -> Self { |
| // Guaranteed to be truncated and does not need sign extension. |
| Scalar::Raw { data: i.into(), size: 4 } |
| } |
| |
| #[inline] |
| pub fn from_u64(i: u64) -> Self { |
| // Guaranteed to be truncated and does not need sign extension. |
| Scalar::Raw { data: i.into(), size: 8 } |
| } |
| |
| #[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> { |
| let i = i.into(); |
| // `into` performed sign extension, we have to truncate |
| let truncated = truncate(i as u128, size); |
| if sign_extend(truncated, size) as i128 == i { |
| Some(Scalar::Raw { data: truncated, size: size.bytes() as u8 }) |
| } else { |
| None |
| } |
| } |
| |
| #[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_i8(i: i8) -> Self { |
| Self::from_int(i, Size::from_bits(8)) |
| } |
| |
| #[inline] |
| pub fn from_i16(i: i16) -> Self { |
| Self::from_int(i, Size::from_bits(16)) |
| } |
| |
| #[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 { |
| // We trust apfloat to give us properly truncated data. |
| Scalar::Raw { data: f.to_bits(), size: 4 } |
| } |
| |
| #[inline] |
| pub fn from_f64(f: Double) -> Self { |
| // We trust apfloat to give us properly truncated data. |
| Scalar::Raw { data: f.to_bits(), size: 8 } |
| } |
| |
| /// This is very rarely the method you want! You should dispatch on the type |
| /// and use `force_bits`/`assert_bits`/`force_ptr`/`assert_ptr`. |
| /// This method only exists for the benefit of low-level memory operations |
| /// as well as the implementation of the `force_*` methods. |
| #[inline] |
| pub fn to_bits_or_ptr( |
| self, |
| target_size: Size, |
| cx: &impl HasDataLayout, |
| ) -> Result<u128, Pointer<Tag>> { |
| assert_ne!(target_size.bytes(), 0, "you should never look at the bits of a ZST"); |
| match self { |
| Scalar::Raw { data, size } => { |
| assert_eq!(target_size.bytes(), u64::from(size)); |
| Scalar::check_data(data, size); |
| Ok(data) |
| } |
| Scalar::Ptr(ptr) => { |
| assert_eq!(target_size, cx.data_layout().pointer_size); |
| Err(ptr) |
| } |
| } |
| } |
| |
| /// This method is intentionally private! |
| /// It is just a helper for other methods in this file. |
| #[inline] |
| 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"); |
| match self { |
| Scalar::Raw { data, size } => { |
| assert_eq!(target_size.bytes(), u64::from(size)); |
| Scalar::check_data(data, size); |
| Ok(data) |
| } |
| Scalar::Ptr(_) => throw_unsup!(ReadPointerAsBytes), |
| } |
| } |
| |
| #[inline(always)] |
| pub fn assert_bits(self, target_size: Size) -> u128 { |
| self.to_bits(target_size).expect("expected Raw bits but got a Pointer") |
| } |
| |
| #[inline] |
| pub fn assert_ptr(self) -> Pointer<Tag> { |
| match self { |
| Scalar::Ptr(p) => p, |
| Scalar::Raw { .. } => bug!("expected a Pointer but got Raw bits"), |
| } |
| } |
| |
| /// Do not call this method! Dispatch based on the type instead. |
| #[inline] |
| pub fn is_bits(self) -> bool { |
| match self { |
| Scalar::Raw { .. } => true, |
| _ => false, |
| } |
| } |
| |
| /// Do not call this method! Dispatch based on the type instead. |
| #[inline] |
| pub fn is_ptr(self) -> bool { |
| match self { |
| Scalar::Ptr(_) => true, |
| _ => false, |
| } |
| } |
| |
| 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)), |
| } |
| } |
| |
| #[inline] |
| fn to_unsigned_with_bit_width(self, bits: u64) -> InterpResult<'static, u128> { |
| let sz = Size::from_bits(bits); |
| self.to_bits(sz) |
| } |
| |
| /// Converts the scalar to produce an `u8`. Fails if the scalar is a pointer. |
| pub fn to_u8(self) -> InterpResult<'static, u8> { |
| self.to_unsigned_with_bit_width(8).map(|v| u8::try_from(v).unwrap()) |
| } |
| |
| /// Converts the scalar to produce an `u16`. Fails if the scalar is a pointer. |
| pub fn to_u16(self) -> InterpResult<'static, u16> { |
| self.to_unsigned_with_bit_width(16).map(|v| u16::try_from(v).unwrap()) |
| } |
| |
| /// Converts the scalar to produce an `u32`. Fails if the scalar is a pointer. |
| pub fn to_u32(self) -> InterpResult<'static, u32> { |
| self.to_unsigned_with_bit_width(32).map(|v| u32::try_from(v).unwrap()) |
| } |
| |
| /// Converts the scalar to produce an `u64`. Fails if the scalar is a pointer. |
| pub fn to_u64(self) -> InterpResult<'static, u64> { |
| self.to_unsigned_with_bit_width(64).map(|v| u64::try_from(v).unwrap()) |
| } |
| |
| pub fn to_machine_usize(self, cx: &impl HasDataLayout) -> InterpResult<'static, u64> { |
| let b = self.to_bits(cx.data_layout().pointer_size)?; |
| Ok(u64::try_from(b).unwrap()) |
| } |
| |
| #[inline] |
| fn to_signed_with_bit_width(self, bits: u64) -> InterpResult<'static, i128> { |
| let sz = Size::from_bits(bits); |
| let b = self.to_bits(sz)?; |
| Ok(sign_extend(b, sz) as i128) |
| } |
| |
| /// Converts the scalar to produce an `i8`. Fails if the scalar is a pointer. |
| pub fn to_i8(self) -> InterpResult<'static, i8> { |
| self.to_signed_with_bit_width(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<'static, i16> { |
| self.to_signed_with_bit_width(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<'static, i32> { |
| self.to_signed_with_bit_width(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<'static, i64> { |
| self.to_signed_with_bit_width(64).map(|v| i64::try_from(v).unwrap()) |
| } |
| |
| pub fn to_machine_isize(self, cx: &impl HasDataLayout) -> InterpResult<'static, i64> { |
| let sz = cx.data_layout().pointer_size; |
| let b = self.to_bits(sz)?; |
| let b = sign_extend(b, sz) as i128; |
| Ok(i64::try_from(b).unwrap()) |
| } |
| |
| #[inline] |
| pub fn to_f32(self) -> InterpResult<'static, Single> { |
| // Going through `u32` to check size and truncation. |
| Ok(Single::from_bits(self.to_u32()?.into())) |
| } |
| |
| #[inline] |
| pub fn to_f64(self) -> InterpResult<'static, Double> { |
| // Going through `u64` to check size and truncation. |
| Ok(Double::from_bits(self.to_u64()?.into())) |
| } |
| } |
| |
| impl<Tag> From<Pointer<Tag>> for Scalar<Tag> { |
| #[inline(always)] |
| fn from(ptr: Pointer<Tag>) -> Self { |
| Scalar::Ptr(ptr) |
| } |
| } |
| |
| #[derive(Clone, Copy, Eq, PartialEq, RustcEncodable, RustcDecodable, HashStable, Hash)] |
| pub enum ScalarMaybeUndef<Tag = (), Id = AllocId> { |
| Scalar(Scalar<Tag, Id>), |
| Undef, |
| } |
| |
| impl<Tag> From<Scalar<Tag>> for ScalarMaybeUndef<Tag> { |
| #[inline(always)] |
| fn from(s: Scalar<Tag>) -> Self { |
| ScalarMaybeUndef::Scalar(s) |
| } |
| } |
| |
| impl<Tag> From<Pointer<Tag>> for ScalarMaybeUndef<Tag> { |
| #[inline(always)] |
| fn from(s: Pointer<Tag>) -> Self { |
| ScalarMaybeUndef::Scalar(s.into()) |
| } |
| } |
| |
| impl<Tag: fmt::Debug, Id: fmt::Debug> fmt::Debug for ScalarMaybeUndef<Tag, Id> { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| match self { |
| ScalarMaybeUndef::Undef => write!(f, "Undef"), |
| ScalarMaybeUndef::Scalar(s) => write!(f, "{:?}", s), |
| } |
| } |
| } |
| |
| impl<Tag> fmt::Display for ScalarMaybeUndef<Tag> { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| match self { |
| ScalarMaybeUndef::Undef => write!(f, "uninitialized bytes"), |
| ScalarMaybeUndef::Scalar(s) => write!(f, "{}", s), |
| } |
| } |
| } |
| |
| impl<'tcx, Tag> ScalarMaybeUndef<Tag> { |
| /// Erase the tag from the scalar, if any. |
| /// |
| /// Used by error reporting code to avoid having the error type depend on `Tag`. |
| #[inline] |
| pub fn erase_tag(self) -> ScalarMaybeUndef { |
| match self { |
| ScalarMaybeUndef::Scalar(s) => ScalarMaybeUndef::Scalar(s.erase_tag()), |
| ScalarMaybeUndef::Undef => ScalarMaybeUndef::Undef, |
| } |
| } |
| |
| #[inline] |
| pub fn not_undef(self) -> InterpResult<'static, Scalar<Tag>> { |
| match self { |
| ScalarMaybeUndef::Scalar(scalar) => Ok(scalar), |
| ScalarMaybeUndef::Undef => throw_ub!(InvalidUndefBytes(None)), |
| } |
| } |
| |
| #[inline(always)] |
| pub fn to_bool(self) -> InterpResult<'tcx, bool> { |
| self.not_undef()?.to_bool() |
| } |
| |
| #[inline(always)] |
| pub fn to_char(self) -> InterpResult<'tcx, char> { |
| self.not_undef()?.to_char() |
| } |
| |
| #[inline(always)] |
| pub fn to_f32(self) -> InterpResult<'tcx, Single> { |
| self.not_undef()?.to_f32() |
| } |
| |
| #[inline(always)] |
| pub fn to_f64(self) -> InterpResult<'tcx, Double> { |
| self.not_undef()?.to_f64() |
| } |
| |
| #[inline(always)] |
| pub fn to_u8(self) -> InterpResult<'tcx, u8> { |
| self.not_undef()?.to_u8() |
| } |
| |
| #[inline(always)] |
| pub fn to_u16(self) -> InterpResult<'tcx, u16> { |
| self.not_undef()?.to_u16() |
| } |
| |
| #[inline(always)] |
| pub fn to_u32(self) -> InterpResult<'tcx, u32> { |
| self.not_undef()?.to_u32() |
| } |
| |
| #[inline(always)] |
| pub fn to_u64(self) -> InterpResult<'tcx, u64> { |
| self.not_undef()?.to_u64() |
| } |
| |
| #[inline(always)] |
| pub fn to_machine_usize(self, cx: &impl HasDataLayout) -> InterpResult<'tcx, u64> { |
| self.not_undef()?.to_machine_usize(cx) |
| } |
| |
| #[inline(always)] |
| pub fn to_i8(self) -> InterpResult<'tcx, i8> { |
| self.not_undef()?.to_i8() |
| } |
| |
| #[inline(always)] |
| pub fn to_i16(self) -> InterpResult<'tcx, i16> { |
| self.not_undef()?.to_i16() |
| } |
| |
| #[inline(always)] |
| pub fn to_i32(self) -> InterpResult<'tcx, i32> { |
| self.not_undef()?.to_i32() |
| } |
| |
| #[inline(always)] |
| pub fn to_i64(self) -> InterpResult<'tcx, i64> { |
| self.not_undef()?.to_i64() |
| } |
| |
| #[inline(always)] |
| pub fn to_machine_isize(self, cx: &impl HasDataLayout) -> InterpResult<'tcx, i64> { |
| self.not_undef()?.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.get_bytes( |
| cx, |
| // invent a pointer, only the offset is relevant anyway |
| Pointer::new(AllocId(0), Size::from_bytes(start)), |
| Size::from_bytes(len), |
| ) |
| .unwrap_or_else(|err| bug!("const slice is invalid: {:?}", err)) |
| } else { |
| bug!("expected const slice, but found another const value"); |
| } |
| } |