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authoriximeow <me@iximeow.net>2021-06-14 17:51:58 -0700
committeriximeow <me@iximeow.net>2021-06-14 17:51:58 -0700
commit7c53435a1c346fb224e9f5ef08304016e240be62 (patch)
treee3084c970b01e2d62a0e46e7716e0d14d84aa31d
parent354940536d4f700e7f441090435362e8f6ca219d (diff)
address diff is an u64 thingy that can be added to addressesnonbyte-words
-rw-r--r--src/address/mod.rs91
1 files changed, 73 insertions, 18 deletions
diff --git a/src/address/mod.rs b/src/address/mod.rs
index d3f5113..e44ca13 100644
--- a/src/address/mod.rs
+++ b/src/address/mod.rs
@@ -5,7 +5,7 @@ use core::fmt;
use core::ops::{Add, Sub, AddAssign, SubAssign};
use num_traits::identities;
-use num_traits::{Bounded, WrappingAdd, WrappingSub, CheckedAdd, CheckedSub};
+use num_traits::{Bounded, WrappingAdd, WrappingSub, CheckedAdd, Zero, One};
#[cfg(feature="use-serde")]
use serde::{Deserialize, Serialize};
@@ -37,11 +37,11 @@ impl AddressDiffAmount for usize {}
/// which is to say, `yaxpeax` assumes associativity holds when `diff` yields a `Some`.
#[cfg(feature="use-serde")]
#[derive(Copy, Clone, PartialEq, PartialOrd, Eq, Ord, Serialize, Deserialize)]
-pub struct AddressDiff<T: AddressDiffAmount> {
+pub struct AddressDiff<T: AddressBase> {
// the AddressDiffAmount trait fools `Deserialize`'s proc macro, so we have to explicitly write
// the bound serde should use.
- #[serde(bound(deserialize = "T: AddressDiffAmount"))]
- amount: T,
+ #[serde(bound(deserialize = "T::Diff: AddressDiffAmount"))]
+ amount: T::Diff,
}
/// a struct describing the differece between some pair of `A: Address`. this is primarily useful
/// in describing the size of an instruction, or the relative offset of a branch.
@@ -60,32 +60,32 @@ pub struct AddressDiff<T: AddressDiffAmount> {
/// which is to say, `yaxpeax` assumes associativity holds when `diff` yields a `Some`.
#[cfg(not(feature="use-serde"))]
#[derive(Copy, Clone, PartialEq, PartialOrd, Eq, Ord)]
-pub struct AddressDiff<T: AddressDiffAmount> {
- amount: T,
+pub struct AddressDiff<T: AddressBase> {
+ amount: T::Diff,
}
-impl<T: AddressDiffAmount> AddressDiff<T> {
- pub fn from_const(amount: T) -> Self {
+impl<T: Address> AddressDiff<T> {
+ pub fn from_const(amount: T::Diff) -> Self {
AddressDiff { amount }
}
}
-impl<T: AddressDiffAmount + fmt::Debug> fmt::Debug for AddressDiff<T> {
+impl<T: Address> fmt::Debug for AddressDiff<T> where T::Diff: fmt::Debug {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "AddressDiff({:?})", self.amount)
}
}
-impl<T: AddressDiffAmount> AddressDiff<T> {
+impl<T: Address> AddressDiff<T> {
pub fn one() -> Self {
AddressDiff {
- amount: T::one(),
+ amount: <T as AddressBase>::Diff::one(),
}
}
pub fn zero() -> Self {
AddressDiff {
- amount: T::zero(),
+ amount: <T as AddressBase>::Diff::zero(),
}
}
}
@@ -208,11 +208,9 @@ pub trait AddressBase where Self:
Ord + Eq + PartialEq + Bounded +
Add<AddressDiff<Self>, Output=Self> + Sub<AddressDiff<Self>, Output=Self> +
AddAssign<AddressDiff<Self>> + SubAssign<AddressDiff<Self>> +
- WrappingAdd + WrappingSub +
- CheckedAdd + CheckedSub +
identities::Zero +
- AddressDiffAmount +
Hash {
+ type Diff: AddressDiffAmount;
fn to_linear(&self) -> usize;
/// compute the `AddressDiff` beetween `self` and `other`.
@@ -220,17 +218,26 @@ pub trait AddressBase where Self:
/// may return `None` if the two addresses aren't comparable. for example, if a pair of
/// addresses are a data-space address and code-space address, there may be no scalar that can
/// describe the difference between them.
- fn diff(&self, other: &Self) -> Option<AddressDiff<Self>> {
+ fn diff(&self, other: &Self) -> Option<AddressDiff<Self>>;
+ /*
+ {
Some(AddressDiff { amount: self.wrapping_sub(other) })
}
+ */
- fn wrapping_offset(&self, other: AddressDiff<Self>) -> Self {
+ fn wrapping_offset(&self, other: AddressDiff<Self>) -> Self;
+ /*
+ {
self.wrapping_add(&other.amount)
}
+ */
- fn checked_offset(&self, other: AddressDiff<Self>) -> Option<Self> {
+ fn checked_offset(&self, other: AddressDiff<Self>) -> Option<Self>;
+ /*
+ {
self.checked_add(&other.amount)
}
+ */
}
#[cfg(all(feature="use-serde", feature="address-parse"))]
@@ -255,25 +262,73 @@ pub trait Address where Self:
pub trait Address where Self: AddressBase { }
impl AddressBase for u16 {
+ type Diff = Self;
fn to_linear(&self) -> usize { *self as usize }
+
+ fn diff(&self, other: &Self) -> Option<AddressDiff<Self>> {
+ Some(AddressDiff { amount: self.wrapping_sub(other) })
+ }
+ fn wrapping_offset(&self, other: AddressDiff<Self>) -> Self {
+ self.wrapping_add(&other.amount)
+ }
+
+ fn checked_offset(&self, other: AddressDiff<Self>) -> Option<Self> {
+ self.checked_add(&other.amount)
+ }
}
impl Address for u16 {}
impl AddressBase for u32 {
+ type Diff = Self;
fn to_linear(&self) -> usize { *self as usize }
+
+ fn diff(&self, other: &Self) -> Option<AddressDiff<Self>> {
+ Some(AddressDiff { amount: self.wrapping_sub(other) })
+ }
+ fn wrapping_offset(&self, other: AddressDiff<Self>) -> Self {
+ self.wrapping_add(&other.amount)
+ }
+
+ fn checked_offset(&self, other: AddressDiff<Self>) -> Option<Self> {
+ self.checked_add(&other.amount)
+ }
}
impl Address for u32 {}
impl AddressBase for u64 {
+ type Diff = Self;
fn to_linear(&self) -> usize { *self as usize }
+
+ fn diff(&self, other: &Self) -> Option<AddressDiff<Self>> {
+ Some(AddressDiff { amount: self.wrapping_sub(other) })
+ }
+ fn wrapping_offset(&self, other: AddressDiff<Self>) -> Self {
+ self.wrapping_add(&other.amount)
+ }
+
+ fn checked_offset(&self, other: AddressDiff<Self>) -> Option<Self> {
+ self.checked_add(&other.amount)
+ }
}
impl Address for u64 {}
impl AddressBase for usize {
+ type Diff = Self;
fn to_linear(&self) -> usize { *self }
+
+ fn diff(&self, other: &Self) -> Option<AddressDiff<Self>> {
+ Some(AddressDiff { amount: self.wrapping_sub(other) })
+ }
+ fn wrapping_offset(&self, other: AddressDiff<Self>) -> Self {
+ self.wrapping_add(&other.amount)
+ }
+
+ fn checked_offset(&self, other: AddressDiff<Self>) -> Option<Self> {
+ self.checked_add(&other.amount)
+ }
}
impl Address for usize {}