Remove reachable coverage without counters #99711
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Remove reachable coverage without counters to maintain invariant that
either there is no coverage at all or there is a live coverage counter
left that provides the function source hash.
The motivating example would be a following closure:
```rust
let f = |x: bool| {
debug_assert!(x);
};
```
Which, with span changes from rust-lang#93967, with disabled debug assertions,
after the final CFG simplifications but before removal of dead blocks,
gives rise to MIR:
```rust
fn main::{closure#0}(_1: &[closure@a.rs:2:13: 2:22], _2: bool) -> () {
debug x => _2;
let mut _0: ();
bb0: {
Coverage::Expression(4294967295) = 1 - 2;
return;
}
...
}
```
rustbot
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|
Some changes occurred to MIR optimizations cc @rust-lang/wg-mir-opt |
rust-highfive
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wesleywiser
approved these changes
Jul 25, 2022
|
@bors r+ |
bors
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Dylan-DPC
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to Dylan-DPC/rust
that referenced
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Jul 25, 2022
Remove reachable coverage without counters
Remove reachable coverage without counters to maintain invariant that
either there is no coverage at all or there is a live coverage counter
left that provides the function source hash.
The motivating example would be a following closure:
```rust
let f = |x: bool| {
debug_assert!(x);
};
```
Which, with span changes from rust-lang#93967, with disabled debug assertions,
after the final CFG simplifications but before removal of dead blocks,
gives rise to MIR:
```rust
fn main::{closure#0}(_1: &[closure@a.rs:2:13: 2:22], _2: bool) -> () {
debug x => _2;
let mut _0: ();
bb0: {
Coverage::Expression(4294967295) = 1 - 2;
return;
}
...
}
```
Which also makes the initial instrumentation quite suspect, although
this pull request doesn't attempt to address that aspect directly.
Fixes rust-lang#98833.
r? `@wesleywiser` `@richkadel`
bors
added a commit
to rust-lang-ci/rust
that referenced
this pull request
Jul 26, 2022
Rollup of 7 pull requests Successful merges: - rust-lang#98211 (Implement `fs::get_path` for FreeBSD.) - rust-lang#99353 (Slightly improve mismatched GAT where clause error) - rust-lang#99593 (Suggest removing the tuple struct field for the unwrapped value) - rust-lang#99615 (Remove some explicit `self.infcx` for `FnCtxt`, which already derefs into `InferCtxt`) - rust-lang#99711 (Remove reachable coverage without counters) - rust-lang#99718 (Avoid `&str`/`Symbol` to `String` conversions) - rust-lang#99720 (Sync rustc_codegen_cranelift) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
bjorn3
pushed a commit
to bjorn3/rust
that referenced
this pull request
Aug 24, 2022
Rollup of 7 pull requests Successful merges: - rust-lang#98211 (Implement `fs::get_path` for FreeBSD.) - rust-lang#99353 (Slightly improve mismatched GAT where clause error) - rust-lang#99593 (Suggest removing the tuple struct field for the unwrapped value) - rust-lang#99615 (Remove some explicit `self.infcx` for `FnCtxt`, which already derefs into `InferCtxt`) - rust-lang#99711 (Remove reachable coverage without counters) - rust-lang#99718 (Avoid `&str`/`Symbol` to `String` conversions) - rust-lang#99720 (Sync rustc_codegen_cranelift) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Remove reachable coverage without counters to maintain invariant that
either there is no coverage at all or there is a live coverage counter
left that provides the function source hash.
The motivating example would be a following closure:
Which, with span changes from #93967, with disabled debug assertions,
after the final CFG simplifications but before removal of dead blocks,
gives rise to MIR:
Which also makes the initial instrumentation quite suspect, although
this pull request doesn't attempt to address that aspect directly.
Fixes #98833.
r? @wesleywiser @richkadel