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Camelid 2020-09-16 15:31:56 -07:00
parent c051f61d3c
commit 57eb29cd2d
1 changed files with 6 additions and 2 deletions
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8
compiler/rustc_middle/src/mir/mod.rs
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@ -1076,20 +1076,24 @@ pub struct VarDebugInfo<'tcx> {
// BasicBlock // BasicBlock
rustc_index::newtype_index! { rustc_index::newtype_index! {
/// The unit of the MIR [control-flow graph][CFG]. /// A node in the MIR [control-flow graph][CFG].
/// ///
/// There are no branches (e.g., `if`s, function calls, etc.) within a basic block, which makes /// There are no branches (e.g., `if`s, function calls, etc.) within a basic block, which makes
/// it easier to do [data-flow analyses] and optimizations. Instead, branches are represented /// it easier to do [data-flow analyses] and optimizations. Instead, branches are represented
/// as an edge in a graph between basic blocks. /// as an edge in a graph between basic blocks.
/// ///
/// Basic blocks consist of a series of [statements][Statement], ending with a /// Basic blocks consist of a series of [statements][Statement], ending with a
/// [terminator][Terminator]. Basic blocks can have multiple predecessors and successors. /// [terminator][Terminator]. Basic blocks can have multiple predecessors and successors,
/// however there is a MIR pass ([`CriticalCallEdges`]) that removes *critical edges*, which
/// are edges that go from a multi-successor node to a multi-predecessor node. This pass is
/// needed because some analyses require that there are no critical edges in the CFG.
/// ///
/// Read more about basic blocks in the [rustc-dev-guide][guide-mir]. /// Read more about basic blocks in the [rustc-dev-guide][guide-mir].
/// ///
/// [CFG]: https://rustc-dev-guide.rust-lang.org/appendix/background.html#cfg /// [CFG]: https://rustc-dev-guide.rust-lang.org/appendix/background.html#cfg
/// [data-flow analyses]: /// [data-flow analyses]:
/// https://rustc-dev-guide.rust-lang.org/appendix/background.html#what-is-a-dataflow-analysis /// https://rustc-dev-guide.rust-lang.org/appendix/background.html#what-is-a-dataflow-analysis
/// [`CriticalCallEdges`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir/transform/add_call_guards/enum.AddCallGuards.html#variant.CriticalCallEdges
/// [guide-mir]: https://rustc-dev-guide.rust-lang.org/mir/ /// [guide-mir]: https://rustc-dev-guide.rust-lang.org/mir/
pub struct BasicBlock { pub struct BasicBlock {
derive [HashStable] derive [HashStable]