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15c411d7
编写于
7月 05, 2017
作者:
F
Felix S. Klock II
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Added some documentation for the `struct BlockSets` in `rustc_mir::dataflow`.
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src/librustc_mir/dataflow/mod.rs
src/librustc_mir/dataflow/mod.rs
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src/librustc_mir/dataflow/mod.rs
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15c411d7
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@@ -446,9 +446,28 @@ pub struct AllSets<E: Idx> {
on_entry_sets
:
Bits
<
E
>
,
}
/// Triple of sets associated with a given block.
///
/// Generally, one sets up `on_entry`, `gen_set`, and `kill_set` for
/// each block individually, and then runs the dataflow analysis which
/// iteratively modifies the various `on_entry` sets (but leaves the
/// other two sets unchanged, since they represent the effect of the
/// block, which should be invariant over the course of the analysis).
///
/// It is best to ensure that the intersection of `gen_set` and
/// `kill_set` is empty; otherwise the results of the dataflow will
/// have a hidden dependency on what order the bits are generated and
/// killed during the iteration. (This is such a good idea that the
/// `fn gen` and `fn kill` methods that set their state enforce this
/// for you.)
pub
struct
BlockSets
<
'a
,
E
:
Idx
>
{
/// Dataflow state immediately before control flow enters the given block.
pub
(
crate
)
on_entry
:
&
'a
mut
IdxSet
<
E
>
,
/// Bits that are set to 1 by the time we exit the given block.
pub
(
crate
)
gen_set
:
&
'a
mut
IdxSet
<
E
>
,
/// Bits that are set to 0 by the time we exit the given block.
pub
(
crate
)
kill_set
:
&
'a
mut
IdxSet
<
E
>
,
}
...
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