Merge #52
52: Refactor ToPrimitive range checks r=cuviper a=cuviper This is a rebase and continuation of PR #28. The primary benefit is that floats finally check for overflow before casting to integers, avoiding undefined behavior. Fixes #12. The inter-integer conversions and all of the macros for these have also been tweaked, hopefully improving readability. Exhaustive tests have been added for good and bad conversions around the target MIN and MAX values.
This commit is contained in:
bors[bot]
commit
fcc33a3577
470
src/cast.rs
470
src/cast.rs
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@ -1,8 +1,9 @@
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use core::{i8, i16, i32, i64, isize};
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use core::{u8, u16, u32, u64, usize};
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use core::{f32, f64};
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use core::mem::size_of;
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use core::num::Wrapping;
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use identities::Zero;
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use bounds::Bounded;
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use float::FloatCore;
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/// A generic trait for converting a value to a number.
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@ -76,62 +77,52 @@ pub trait ToPrimitive {
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}
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macro_rules! impl_to_primitive_int_to_int {
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($SrcT:ty, $DstT:ty, $slf:expr) => (
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{
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if size_of::<$SrcT>() <= size_of::<$DstT>() {
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Some($slf as $DstT)
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} else {
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let n = $slf as i64;
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let min_value: $DstT = Bounded::min_value();
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let max_value: $DstT = Bounded::max_value();
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if min_value as i64 <= n && n <= max_value as i64 {
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Some($slf as $DstT)
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} else {
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None
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}
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}
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}
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)
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}
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macro_rules! impl_to_primitive_int_to_uint {
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($SrcT:ty, $DstT:ty, $slf:expr) => (
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{
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let zero: $SrcT = Zero::zero();
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let max_value: $DstT = Bounded::max_value();
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if zero <= $slf && $slf as u64 <= max_value as u64 {
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Some($slf as $DstT)
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($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
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#[inline]
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fn $method(&self) -> Option<$DstT> {
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let min = $DstT::MIN as $SrcT;
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let max = $DstT::MAX as $SrcT;
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if size_of::<$SrcT>() <= size_of::<$DstT>() || (min <= *self && *self <= max) {
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Some(*self as $DstT)
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} else {
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None
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}
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}
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)
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)*}
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}
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macro_rules! impl_to_primitive_int_to_uint {
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($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
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#[inline]
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fn $method(&self) -> Option<$DstT> {
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let max = $DstT::MAX as u64;
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if 0 <= *self && (size_of::<$SrcT>() < size_of::<$DstT>() || *self as u64 <= max) {
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Some(*self as $DstT)
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} else {
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None
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}
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}
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)*}
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}
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macro_rules! impl_to_primitive_int {
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($T:ty) => (
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($T:ident) => (
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impl ToPrimitive for $T {
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#[inline]
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fn to_isize(&self) -> Option<isize> { impl_to_primitive_int_to_int!($T, isize, *self) }
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#[inline]
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fn to_i8(&self) -> Option<i8> { impl_to_primitive_int_to_int!($T, i8, *self) }
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#[inline]
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fn to_i16(&self) -> Option<i16> { impl_to_primitive_int_to_int!($T, i16, *self) }
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#[inline]
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fn to_i32(&self) -> Option<i32> { impl_to_primitive_int_to_int!($T, i32, *self) }
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#[inline]
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fn to_i64(&self) -> Option<i64> { impl_to_primitive_int_to_int!($T, i64, *self) }
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impl_to_primitive_int_to_int! { $T:
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fn to_isize -> isize;
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fn to_i8 -> i8;
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fn to_i16 -> i16;
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fn to_i32 -> i32;
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fn to_i64 -> i64;
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}
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#[inline]
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fn to_usize(&self) -> Option<usize> { impl_to_primitive_int_to_uint!($T, usize, *self) }
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#[inline]
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fn to_u8(&self) -> Option<u8> { impl_to_primitive_int_to_uint!($T, u8, *self) }
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#[inline]
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fn to_u16(&self) -> Option<u16> { impl_to_primitive_int_to_uint!($T, u16, *self) }
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#[inline]
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fn to_u32(&self) -> Option<u32> { impl_to_primitive_int_to_uint!($T, u32, *self) }
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#[inline]
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fn to_u64(&self) -> Option<u64> { impl_to_primitive_int_to_uint!($T, u64, *self) }
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impl_to_primitive_int_to_uint! { $T:
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fn to_usize -> usize;
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fn to_u8 -> u8;
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fn to_u16 -> u16;
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fn to_u32 -> u32;
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fn to_u64 -> u64;
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}
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#[inline]
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fn to_f32(&self) -> Option<f32> { Some(*self as f32) }
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@ -148,62 +139,51 @@ impl_to_primitive_int!(i32);
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impl_to_primitive_int!(i64);
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macro_rules! impl_to_primitive_uint_to_int {
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($DstT:ty, $slf:expr) => (
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{
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let max_value: $DstT = Bounded::max_value();
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if $slf as u64 <= max_value as u64 {
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Some($slf as $DstT)
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($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
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#[inline]
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fn $method(&self) -> Option<$DstT> {
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let max = $DstT::MAX as u64;
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if size_of::<$SrcT>() < size_of::<$DstT>() || *self as u64 <= max {
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Some(*self as $DstT)
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} else {
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None
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}
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}
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)
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)*}
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}
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macro_rules! impl_to_primitive_uint_to_uint {
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($SrcT:ty, $DstT:ty, $slf:expr) => (
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{
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if size_of::<$SrcT>() <= size_of::<$DstT>() {
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Some($slf as $DstT)
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($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
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#[inline]
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fn $method(&self) -> Option<$DstT> {
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let max = $DstT::MAX as $SrcT;
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if size_of::<$SrcT>() <= size_of::<$DstT>() || *self <= max {
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Some(*self as $DstT)
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} else {
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let zero: $SrcT = Zero::zero();
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let max_value: $DstT = Bounded::max_value();
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if zero <= $slf && $slf as u64 <= max_value as u64 {
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Some($slf as $DstT)
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} else {
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None
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}
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None
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}
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}
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)
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)*}
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}
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macro_rules! impl_to_primitive_uint {
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($T:ty) => (
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($T:ident) => (
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impl ToPrimitive for $T {
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#[inline]
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fn to_isize(&self) -> Option<isize> { impl_to_primitive_uint_to_int!(isize, *self) }
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#[inline]
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fn to_i8(&self) -> Option<i8> { impl_to_primitive_uint_to_int!(i8, *self) }
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#[inline]
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fn to_i16(&self) -> Option<i16> { impl_to_primitive_uint_to_int!(i16, *self) }
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#[inline]
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fn to_i32(&self) -> Option<i32> { impl_to_primitive_uint_to_int!(i32, *self) }
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#[inline]
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fn to_i64(&self) -> Option<i64> { impl_to_primitive_uint_to_int!(i64, *self) }
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#[inline]
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fn to_usize(&self) -> Option<usize> {
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impl_to_primitive_uint_to_uint!($T, usize, *self)
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impl_to_primitive_uint_to_int! { $T:
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fn to_isize -> isize;
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fn to_i8 -> i8;
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fn to_i16 -> i16;
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fn to_i32 -> i32;
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fn to_i64 -> i64;
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}
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impl_to_primitive_uint_to_uint! { $T:
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fn to_usize -> usize;
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fn to_u8 -> u8;
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fn to_u16 -> u16;
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fn to_u32 -> u32;
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fn to_u64 -> u64;
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}
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#[inline]
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fn to_u8(&self) -> Option<u8> { impl_to_primitive_uint_to_uint!($T, u8, *self) }
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#[inline]
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fn to_u16(&self) -> Option<u16> { impl_to_primitive_uint_to_uint!($T, u16, *self) }
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#[inline]
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fn to_u32(&self) -> Option<u32> { impl_to_primitive_uint_to_uint!($T, u32, *self) }
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#[inline]
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fn to_u64(&self) -> Option<u64> { impl_to_primitive_uint_to_uint!($T, u64, *self) }
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#[inline]
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fn to_f32(&self) -> Option<f32> { Some(*self as f32) }
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@ -220,53 +200,99 @@ impl_to_primitive_uint!(u32);
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impl_to_primitive_uint!(u64);
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macro_rules! impl_to_primitive_float_to_float {
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($SrcT:ident, $DstT:ident, $slf:expr) => (
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if size_of::<$SrcT>() <= size_of::<$DstT>() {
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Some($slf as $DstT)
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} else {
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// Make sure the value is in range for the cast.
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// NaN and +-inf are cast as they are.
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let n = $slf as f64;
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let max_value: $DstT = ::core::$DstT::MAX;
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if !FloatCore::is_finite(n) || (-max_value as f64 <= n && n <= max_value as f64)
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{
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Some($slf as $DstT)
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} else {
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None
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($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
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#[inline]
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fn $method(&self) -> Option<$DstT> {
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// Only finite values that are reducing size need to worry about overflow.
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if size_of::<$SrcT>() > size_of::<$DstT>() && FloatCore::is_finite(*self) {
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let n = *self as f64;
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if n < $DstT::MIN as f64 || n > $DstT::MAX as f64 {
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return None;
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}
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}
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// We can safely cast NaN, +-inf, and finite values in range.
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Some(*self as $DstT)
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}
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)
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)*}
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}
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macro_rules! impl_to_primitive_float_to_signed_int {
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($f:ident : $( fn $method:ident -> $i:ident ; )*) => {$(
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#[inline]
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fn $method(&self) -> Option<$i> {
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// Float as int truncates toward zero, so we want to allow values
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// in the exclusive range `(MIN-1, MAX+1)`.
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if size_of::<$f>() > size_of::<$i>() {
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// With a larger size, we can represent the range exactly.
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const MIN_M1: $f = $i::MIN as $f - 1.0;
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const MAX_P1: $f = $i::MAX as $f + 1.0;
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if *self > MIN_M1 && *self < MAX_P1 {
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return Some(*self as $i);
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}
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} else {
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// We can't represent `MIN-1` exactly, but there's no fractional part
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// at this magnitude, so we can just use a `MIN` inclusive boundary.
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const MIN: $f = $i::MIN as $f;
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// We can't represent `MAX` exactly, but it will round up to exactly
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// `MAX+1` (a power of two) when we cast it.
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const MAX_P1: $f = $i::MAX as $f;
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if *self >= MIN && *self < MAX_P1 {
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return Some(*self as $i);
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}
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}
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None
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}
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)*}
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}
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macro_rules! impl_to_primitive_float_to_unsigned_int {
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($f:ident : $( fn $method:ident -> $u:ident ; )*) => {$(
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#[inline]
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fn $method(&self) -> Option<$u> {
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// Float as int truncates toward zero, so we want to allow values
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// in the exclusive range `(-1, MAX+1)`.
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if size_of::<$f>() > size_of::<$u>() {
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// With a larger size, we can represent the range exactly.
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const MAX_P1: $f = $u::MAX as $f + 1.0;
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if *self > -1.0 && *self < MAX_P1 {
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return Some(*self as $u);
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}
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} else {
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// We can't represent `MAX` exactly, but it will round up to exactly
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// `MAX+1` (a power of two) when we cast it.
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const MAX_P1: $f = $u::MAX as $f;
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if *self > -1.0 && *self < MAX_P1 {
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return Some(*self as $u);
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}
|
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}
|
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None
|
||||
}
|
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)*}
|
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}
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macro_rules! impl_to_primitive_float {
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($T:ident) => (
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impl ToPrimitive for $T {
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#[inline]
|
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fn to_isize(&self) -> Option<isize> { Some(*self as isize) }
|
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#[inline]
|
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fn to_i8(&self) -> Option<i8> { Some(*self as i8) }
|
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#[inline]
|
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fn to_i16(&self) -> Option<i16> { Some(*self as i16) }
|
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#[inline]
|
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fn to_i32(&self) -> Option<i32> { Some(*self as i32) }
|
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#[inline]
|
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fn to_i64(&self) -> Option<i64> { Some(*self as i64) }
|
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impl_to_primitive_float_to_signed_int! { $T:
|
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fn to_isize -> isize;
|
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fn to_i8 -> i8;
|
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fn to_i16 -> i16;
|
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fn to_i32 -> i32;
|
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fn to_i64 -> i64;
|
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}
|
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|
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#[inline]
|
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fn to_usize(&self) -> Option<usize> { Some(*self as usize) }
|
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#[inline]
|
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fn to_u8(&self) -> Option<u8> { Some(*self as u8) }
|
||||
#[inline]
|
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fn to_u16(&self) -> Option<u16> { Some(*self as u16) }
|
||||
#[inline]
|
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fn to_u32(&self) -> Option<u32> { Some(*self as u32) }
|
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#[inline]
|
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fn to_u64(&self) -> Option<u64> { Some(*self as u64) }
|
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impl_to_primitive_float_to_unsigned_int! { $T:
|
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fn to_usize -> usize;
|
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fn to_u8 -> u8;
|
||||
fn to_u16 -> u16;
|
||||
fn to_u32 -> u32;
|
||||
fn to_u64 -> u64;
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn to_f32(&self) -> Option<f32> { impl_to_primitive_float_to_float!($T, f32, *self) }
|
||||
#[inline]
|
||||
fn to_f64(&self) -> Option<f64> { impl_to_primitive_float_to_float!($T, f64, *self) }
|
||||
impl_to_primitive_float_to_float! { $T:
|
||||
fn to_f32 -> f32;
|
||||
fn to_f64 -> f64;
|
||||
}
|
||||
}
|
||||
)
|
||||
}
|
||||
|
|
@ -591,3 +617,191 @@ fn as_primitive() {
|
|||
let x: u8 = (768i16).as_();
|
||||
assert_eq!(x, 0);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn float_to_integer_checks_overflow() {
|
||||
// This will overflow an i32
|
||||
let source: f64 = 1.0e+123f64;
|
||||
|
||||
// Expect the overflow to be caught
|
||||
assert_eq!(cast::<f64, i32>(source), None);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn cast_to_int_checks_overflow() {
|
||||
let big_f: f64 = 1.0e123;
|
||||
let normal_f: f64 = 1.0;
|
||||
let small_f: f64 = -1.0e123;
|
||||
assert_eq!(None, cast::<f64, isize>(big_f));
|
||||
assert_eq!(None, cast::<f64, i8>(big_f));
|
||||
assert_eq!(None, cast::<f64, i16>(big_f));
|
||||
assert_eq!(None, cast::<f64, i32>(big_f));
|
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assert_eq!(None, cast::<f64, i64>(big_f));
|
||||
|
||||
assert_eq!(Some(normal_f as isize), cast::<f64, isize>(normal_f));
|
||||
assert_eq!(Some(normal_f as i8), cast::<f64, i8>(normal_f));
|
||||
assert_eq!(Some(normal_f as i16), cast::<f64, i16>(normal_f));
|
||||
assert_eq!(Some(normal_f as i32), cast::<f64, i32>(normal_f));
|
||||
assert_eq!(Some(normal_f as i64), cast::<f64, i64>(normal_f));
|
||||
|
||||
assert_eq!(None, cast::<f64, isize>(small_f));
|
||||
assert_eq!(None, cast::<f64, i8>(small_f));
|
||||
assert_eq!(None, cast::<f64, i16>(small_f));
|
||||
assert_eq!(None, cast::<f64, i32>(small_f));
|
||||
assert_eq!(None, cast::<f64, i64>(small_f));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn cast_to_unsigned_int_checks_overflow() {
|
||||
let big_f: f64 = 1.0e123;
|
||||
let normal_f: f64 = 1.0;
|
||||
let small_f: f64 = -1.0e123;
|
||||
assert_eq!(None, cast::<f64, usize>(big_f));
|
||||
assert_eq!(None, cast::<f64, u8>(big_f));
|
||||
assert_eq!(None, cast::<f64, u16>(big_f));
|
||||
assert_eq!(None, cast::<f64, u32>(big_f));
|
||||
assert_eq!(None, cast::<f64, u64>(big_f));
|
||||
|
||||
assert_eq!(Some(normal_f as usize), cast::<f64, usize>(normal_f));
|
||||
assert_eq!(Some(normal_f as u8), cast::<f64, u8>(normal_f));
|
||||
assert_eq!(Some(normal_f as u16), cast::<f64, u16>(normal_f));
|
||||
assert_eq!(Some(normal_f as u32), cast::<f64, u32>(normal_f));
|
||||
assert_eq!(Some(normal_f as u64), cast::<f64, u64>(normal_f));
|
||||
|
||||
assert_eq!(None, cast::<f64, usize>(small_f));
|
||||
assert_eq!(None, cast::<f64, u8>(small_f));
|
||||
assert_eq!(None, cast::<f64, u16>(small_f));
|
||||
assert_eq!(None, cast::<f64, u32>(small_f));
|
||||
assert_eq!(None, cast::<f64, u64>(small_f));
|
||||
}
|
||||
|
||||
#[cfg(all(test, feature = "std"))]
|
||||
fn dbg(args: ::core::fmt::Arguments) {
|
||||
println!("{}", args);
|
||||
}
|
||||
|
||||
#[cfg(all(test, not(feature = "std")))]
|
||||
fn dbg(_: ::core::fmt::Arguments) {}
|
||||
|
||||
// Rust 1.8 doesn't handle cfg on macros correctly
|
||||
// #[cfg(test)]
|
||||
#[allow(unused)]
|
||||
macro_rules! dbg { ($($tok:tt)*) => { dbg(format_args!($($tok)*)) } }
|
||||
|
||||
#[test]
|
||||
fn cast_float_to_int_edge_cases() {
|
||||
use core::mem::transmute;
|
||||
|
||||
trait RawOffset: Sized {
|
||||
type Raw;
|
||||
fn raw_offset(self, offset: Self::Raw) -> Self;
|
||||
}
|
||||
impl RawOffset for f32 {
|
||||
type Raw = i32;
|
||||
fn raw_offset(self, offset: Self::Raw) -> Self {
|
||||
unsafe {
|
||||
let raw: Self::Raw = transmute(self);
|
||||
transmute(raw + offset)
|
||||
}
|
||||
}
|
||||
}
|
||||
impl RawOffset for f64 {
|
||||
type Raw = i64;
|
||||
fn raw_offset(self, offset: Self::Raw) -> Self {
|
||||
unsafe {
|
||||
let raw: Self::Raw = transmute(self);
|
||||
transmute(raw + offset)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
macro_rules! test_edge {
|
||||
($f:ident -> $($t:ident)+) => { $({
|
||||
dbg!("testing cast edge cases for {} -> {}", stringify!($f), stringify!($t));
|
||||
|
||||
let small = if $t::MIN == 0 || size_of::<$t>() < size_of::<$f>() {
|
||||
$t::MIN as $f - 1.0
|
||||
} else {
|
||||
($t::MIN as $f).raw_offset(1).floor()
|
||||
};
|
||||
let fmin = small.raw_offset(-1);
|
||||
dbg!(" testing min {}\n\tvs. {:.16}\n\tand {:.16}", $t::MIN, fmin, small);
|
||||
assert_eq!(Some($t::MIN), cast::<$f, $t>($t::MIN as $f));
|
||||
assert_eq!(Some($t::MIN), cast::<$f, $t>(fmin));
|
||||
assert_eq!(None, cast::<$f, $t>(small));
|
||||
|
||||
let (max, large) = if size_of::<$t>() < size_of::<$f>() {
|
||||
($t::MAX, $t::MAX as $f + 1.0)
|
||||
} else {
|
||||
let large = $t::MAX as $f; // rounds up!
|
||||
let max = large.raw_offset(-1) as $t; // the next smallest possible
|
||||
assert_eq!(max.count_ones(), $f::MANTISSA_DIGITS);
|
||||
(max, large)
|
||||
};
|
||||
let fmax = large.raw_offset(-1);
|
||||
dbg!(" testing max {}\n\tvs. {:.16}\n\tand {:.16}", max, fmax, large);
|
||||
assert_eq!(Some(max), cast::<$f, $t>(max as $f));
|
||||
assert_eq!(Some(max), cast::<$f, $t>(fmax));
|
||||
assert_eq!(None, cast::<$f, $t>(large));
|
||||
|
||||
dbg!(" testing non-finite values");
|
||||
assert_eq!(None, cast::<$f, $t>($f::NAN));
|
||||
assert_eq!(None, cast::<$f, $t>($f::INFINITY));
|
||||
assert_eq!(None, cast::<$f, $t>($f::NEG_INFINITY));
|
||||
})+}
|
||||
}
|
||||
|
||||
test_edge!(f32 -> isize i8 i16 i32 i64);
|
||||
test_edge!(f32 -> usize u8 u16 u32 u64);
|
||||
test_edge!(f64 -> isize i8 i16 i32 i64);
|
||||
test_edge!(f64 -> usize u8 u16 u32 u64);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn cast_int_to_int_edge_cases() {
|
||||
use core::cmp::Ordering::*;
|
||||
|
||||
macro_rules! test_edge {
|
||||
($f:ident -> $($t:ident)+) => { $({
|
||||
fn test_edge() {
|
||||
dbg!("testing cast edge cases for {} -> {}", stringify!($f), stringify!($t));
|
||||
|
||||
match ($f::MIN as i64).cmp(&($t::MIN as i64)) {
|
||||
Greater => {
|
||||
assert_eq!(Some($f::MIN as $t), cast::<$f, $t>($f::MIN));
|
||||
}
|
||||
Equal => {
|
||||
assert_eq!(Some($t::MIN), cast::<$f, $t>($f::MIN));
|
||||
}
|
||||
Less => {
|
||||
let min = $t::MIN as $f;
|
||||
assert_eq!(Some($t::MIN), cast::<$f, $t>(min));
|
||||
assert_eq!(None, cast::<$f, $t>(min - 1));
|
||||
}
|
||||
}
|
||||
|
||||
match ($f::MAX as u64).cmp(&($t::MAX as u64)) {
|
||||
Greater => {
|
||||
let max = $t::MAX as $f;
|
||||
assert_eq!(Some($t::MAX), cast::<$f, $t>(max));
|
||||
assert_eq!(None, cast::<$f, $t>(max + 1));
|
||||
}
|
||||
Equal => {
|
||||
assert_eq!(Some($t::MAX), cast::<$f, $t>($f::MAX));
|
||||
}
|
||||
Less => {
|
||||
assert_eq!(Some($f::MAX as $t), cast::<$f, $t>($f::MAX));
|
||||
}
|
||||
}
|
||||
}
|
||||
test_edge();
|
||||
})+};
|
||||
($( $from:ident )+) => { $({
|
||||
test_edge!($from -> isize i8 i16 i32 i64);
|
||||
test_edge!($from -> usize u8 u16 u32 u64);
|
||||
})+}
|
||||
}
|
||||
|
||||
test_edge!(isize i8 i16 i32 i64);
|
||||
test_edge!(usize u8 u16 u32 u64);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue