bootstrap: Remove commit hash from LLVM version suffix to avoid rebuilds
The custom LLVM version suffix was introduced to avoid unintentional
library names conflicts. By default it included the LLVM submodule
commit hash. Changing the version suffix requires the complete LLVM
rebuild, and since then every change to the submodules required it as
well.
Remove the commit hash from version suffix to avoid complete rebuilds,
while leaving the `rust` string, the release number and release channel
to disambiguate the library name.
Context: version suffix was introduced by #59173 as solution to #59034.
Resolves#68715.
Use new dataflow framework for generators
#65672 introduced a new dataflow framework that can handle arbitrarily complex transfer functions as well as ones expressed as a series of gen/kill operations. This PR ports the analyses used to implement generators to the new framework so that we can remove the old one. See #68241 for a prior example of this. The new framework has some superficial API changes, but this shouldn't alter the generator passes in any way.
r? @tmandry
Skip `Drop` terminators for enum variants without drop glue
Split out from #68528.
When doing drop elaboration for an `enum` that may or may not be moved out of (an open drop), we check the discriminant of the `enum` to see whether the live variant has any drop flags and then check the drop flags to see whether we need to drop each field. Sometimes, however, the live
variant has no move paths and thus no drop flags. In this case, we still emit a drop terminator
for the entire enum after checking the enum discriminant. This drop shim will check the discriminant of the enum *again* and then drop the fields of the active variant. If the active variant has no drop glue, nothing will be done.
This commit skips emitting the drop terminator during drop elaboration when the "otherwise" variants, those without move paths, have no drop glue. A common example of this scenario is when an `Option` is moved from, since `Option::None` never needs drop glue. Below is a fragment the pre-codegen CFG for `Option::unwrap_or` in which we check the drop flag (`_5`) for `self` (`_1`), before and after the change.
Before:
After:
This change doesn't do much on its own, but it is a prerequisite to get the perf gains from #68528.
cc @arielb1
Rename `libsyntax` to `librustc_ast`
This was the last rustc crate that wasn't following the `rustc_*` naming convention.
Follow-up to https://github.com/rust-lang/rust/pull/67763.
Implementes suggeseted changes by Centril.
This checks whether the memory location of the cast remains the same
after atttempting to parse a postfix operator after a cast has been
parsed. If the address is not the same, an illegal postfix operator
was parsed.
Previously the code generated a hash of the pointer, which was overly
complex and inefficent. Casting the pointers and comparing them
is simpler and more effcient.
rustc_parse: Tweak the function parameter name check
The function doesn't need a full token, only its edition.
Noticed while implementing https://github.com/rust-lang/rust/pull/69384.
I'm still not sure whether normalized or unnormalized token is a better fit for the edition check here, so https://github.com/rust-lang/rust/pull/69384 and this PR just keep the status quo behavior.
r? @Centril
Correct comment to match behavior
Corrects the header comment on `saturating_duration_since` to match the behavior of returning 0 if the other timestamp is _later_ than the invocant, not earlier,
This is purely a documentation change, so hopefully it doesn't require an issue; if it does, I'll open one and resubmit.
fix aliasing violation in align_to_mut
Fixes https://github.com/rust-lang/rust/issues/68549
I decided to add the testcase here to make it all one PR, but if you prefer I can also add that test case in the Miri repo instead.
perf: Buffer stderr when writing json errors/warnings
Since `stderr` is unbuffered, writing out json messages actually take up
about ~10%/0.1s of the runtime of the `inflate` benchmark as it generates a fair number of warnings.
cc #64413
