Struct MaybeRelSourceLoc 

pub struct MaybeRelSourceLoc(/* private fields */);

A source location that is either a RelSourceLoc or SourceLoc.

This is used to represent a source location in the MachBuffer that is initially relative to some base and is later relocated. We do this to permit better code caching during incremental compilation: the MachBuffer records the first SourceLoc it is given as a base, and if the same function IR is later compiled but with a different starting SourceLoc, we can reuse the cached compilation result and just relocate (offset) the SourceLocs.

This relocation is an in-place update pass, so we want a “union” type, essentially, but we don’t want to pay the overhead of a true enum (8 bytes rather than 4 in a large array), so we bitpack this representation.

Implementations

impl MaybeRelSourceLoc

pub fn rel(loc: RelSourceLoc) -> Self

Create a relative SourceLoc.

pub fn abs(loc: SourceLoc) -> Self

Create an absolute SourceLoc.

pub fn is_rel(&self) -> bool

Is this a relative SourceLoc?

pub fn is_abs(&self) -> bool

Is this an absolute SourceLoc?

pub fn as_rel(&self) -> RelSourceLoc

Unwrap a relative SourceLoc.

Panics

Panics if this is not a relative SourceLoc.

pub fn as_abs(&self) -> SourceLoc

Unwrap an absolute SourceLoc.

Panics

Panics if this is not an absolute SourceLoc.

pub fn relocate(&self, base: SourceLoc) -> SourceLoc

Map a relative to an absolute SourceLoc, given another absolute SourceLoc as a base.

Panics

Panics if this is not a relative SourceLoc.

Trait Implementations

impl Clone for MaybeRelSourceLoc

fn clone(&self) -> MaybeRelSourceLoc

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for MaybeRelSourceLoc

impl Debug for MaybeRelSourceLoc

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for MaybeRelSourceLoc

Available on crate feature enable-serde only.

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for MaybeRelSourceLoc

impl Hash for MaybeRelSourceLoc

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for MaybeRelSourceLoc

fn eq(&self, other: &MaybeRelSourceLoc) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for MaybeRelSourceLoc

Available on crate feature enable-serde only.

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for MaybeRelSourceLoc