mirror of
https://github.com/rust-lang/rust.git
synced 2025-10-31 04:57:19 +00:00
36b495f3cf
This reduces peak memory usage significantly for some programs with very large functions, such as: - `keccak`, `unicode_normalization`, and `match-stress-enum`, from the `rustc-perf` benchmark suite; - `http-0.2.6` from crates.io. The new type is used in the analyses where the bitsets can get huge (e.g. 10s of thousands of bits): `MaybeInitializedPlaces`, `MaybeUninitializedPlaces`, and `EverInitializedPlaces`. Some refactoring was required in `rustc_mir_dataflow`. All existing analysis domains are either `BitSet` or a trivial wrapper around `BitSet`, and access in a few places is done via `Borrow<BitSet>` or `BorrowMut<BitSet>`. Now that some of these domains are `ClusterBitSet`, that no longer works. So this commit replaces the `Borrow`/`BorrowMut` usage with a new trait `BitSetExt` containing the needed bitset operations. The impls just forward these to the underlying bitset type. This required fiddling with trait bounds in a few places. The commit also: - Moves `static_assert_size` from `rustc_data_structures` to `rustc_index` so it can be used in the latter; the former now re-exports it so existing users are unaffected. - Factors out some common "clear excess bits in the final word" functionality in `bit_set.rs`. - Uses `fill` in a few places instead of loops.
38 lines
973 B
Rust
38 lines
973 B
Rust
#[macro_export]
|
|
macro_rules! enum_from_u32 {
|
|
($(#[$attr:meta])* pub enum $name:ident {
|
|
$($(#[$var_attr:meta])* $variant:ident = $e:expr,)*
|
|
}) => {
|
|
$(#[$attr])*
|
|
pub enum $name {
|
|
$($(#[$var_attr])* $variant = $e),*
|
|
}
|
|
|
|
impl $name {
|
|
pub fn from_u32(u: u32) -> Option<$name> {
|
|
$(if u == $name::$variant as u32 {
|
|
return Some($name::$variant)
|
|
})*
|
|
None
|
|
}
|
|
}
|
|
};
|
|
($(#[$attr:meta])* pub enum $name:ident {
|
|
$($(#[$var_attr:meta])* $variant:ident,)*
|
|
}) => {
|
|
$(#[$attr])*
|
|
pub enum $name {
|
|
$($(#[$var_attr])* $variant,)*
|
|
}
|
|
|
|
impl $name {
|
|
pub fn from_u32(u: u32) -> Option<$name> {
|
|
$(if u == $name::$variant as u32 {
|
|
return Some($name::$variant)
|
|
})*
|
|
None
|
|
}
|
|
}
|
|
}
|
|
}
|