WebAssembly supports saturating floating point to integer casts behind a
target feature. The feature is already available on many browsers.
Beginning with 1.45 Rust will start defining the behavior of floating
point to integer casts to be saturating as well. For this Rust
constructs additional checks on top of the `fptoui` / `fptosi`
instructions it emits. Here we introduce the possibility for the codegen
backend to construct saturating casts itself and only fall back to
constructing the checks ourselves if that is not possible.
Fix wasm32 being broken due to a NodeJS version bump
Emscripten's SDK [recently bumped the version of NodeJS they shipped](https://github.com/emscripten-core/emsdk/pull/529), but our Dockerfile for the wasm32 builder hardcoded the version number. This will cause consistent CI failures once the currently cached image is rebuilt (either due to a change or due to the cache expiring).
This PR fixes the problem by finding the latest version of NodeJS in the Emscripten SDK and symlinking it to a "latest" directory, which is then added to the `PATH`.
Compile rustdoc less often.
Previously rustdoc was built 3 times with `x.py test`:
1. stage2 (using stage1 compiler) for compiletest tests (stage1-tools copied to stage2).
2. stage1 (using stage0 compiler) for std crate tests (stage0-tools copied to stage1).
3. stage2 test (using stage2 compiler) for rustdoc crate tests and error_index_generator (stage2-tools).
This PR removes the majority of number 3, where it will instead use the stage1 compiler, which will share the artifacts from number 1.
This matches the behavior of the libstd crate tests. I don't think it is entirely necessary to run the tests using stage2.
At `-j2`, the last build step goes from about 300s to 70s on my machine. It's not a huge win, but shaving 4 minutes isn't bad.
The other two builds would be pretty difficult (or undesired or impossible) to unify. It looks like std tests use stage1 very intentionally (see `force_use_stage1` and its history), and compiletests use the top stage very intentionally.
Unfortunately the linkchecker builds all docs at stage2 (stage2-tools), which means a few build script artifacts are not shared. It's not really clear to me how to fix that (because it uses `default_doc`, there doesn't seem to be any control over the stages).
---
For `x.py doc`, rustdoc was previously built three times (with compiler-docs):
1. stage2 (using stage1 compiler) for normal documentation output (stage1-tools copied to stage2).
2. stage1 (using stage0 compiler) for compiler-docs
3. stage2 (using stage2 compiler) for error_index_generator (stage2-tools)
This PR combines these so that they consistently use the "top stage" rustdoc. I don't know why the compiler-docs was written to use stage minus one, but it seems better to be consistent across the doc steps.
---
I've tried to test this with a variety of commands (`x.py doc`, `x.py test`, different `--stage` flags, `full-bootstrap`, setting `--target`, etc.) to try to make sure there aren't significant regressions here. It's tricky since there are so many variables, and this stuff is difficult for me to fully understand.
Closes#70799 (I think)
add spans to injected coverage counters, extract with CoverageData query
This is the next iteration on the Rust Coverage implementation, and follows PR #73488
@tmandry @wesleywiser
I came up with an approach for coverage spans, pushing them through the Call terminator as additional args so they can be extracted by the CoverageData query.
I'm using an IndexVec to store them in CoverageData such that there can be only one per index (even if parts of the MIR get duplicated during optimization).
If this approach works for you, I can quickly expand on this to build a separate IndexVec for counter expressions, using a separate call that will be ignored during code generation, but from which I can extract the counter expression values.
Let me know your thoughts. Thanks!
r? @tmandry
Rust compiler MCP rust-lang/compiler-team#278
Relevant issue: #34701 - Implement support for LLVMs code coverage instrumentation
Deny unsafe ops in unsafe fns in libcore
After `liballoc`, It's time for `libcore` :D
I planned to do this bit by bit to avoid having a big chunk of diffs, so to make reviews easier, and to make the unsafe blocks narrower and take the time to document them properly.
r? @nikomatsakis cc @RalfJung
Rewrite a few manual index loops with while-let
There were a few instances of this pattern:
```rust
while index < vec.len() {
let item = &vec[index];
// ...
}
```
These can be indexed at once:
```rust
while let Some(item) = vec.get(index) {
// ...
}
```
Particularly in `ObligationForest::process_obligations`, this mitigates
a codegen regression found with LLVM 11 (#73526).
`#[deny(unsafe_op_in_unsafe_fn)]` in libstd/fs.rs
The `libstd/fs.rs` part of https://github.com/rust-lang/rust/issues/73904 . Wraps the two calls to an unsafe fn `Initializer::nop()` in an `unsafe` block.
Followed instructions in parent issue, ran `./x.py check src/libstd/` after adding the lint and two warnings were given. After adding these changes, those disappear.
Split and expand nonstandard-style lints unicode unit test.
RFC 2457 requested that the `nonstandard_style` series of linted be adjusted to cover the non_ascii_identifier case. However when i read the code of those implementations, it seems they're already supporting non_ascii_identifiers. But the exact rules is a little different than what's proposed in RFC 2457.
So I splitted and expanded the existing test case to try to exercise every branch in the code. I think it'll also be easier to examine the cases in these unit tests to see whether it's ok to just leave them as is, or some adjustments are needed.
r? @Manishearth
Recover extra trailing angle brackets in struct definition
This commit applies the existing 'extra angle bracket recovery' logic
when parsing fields in struct definitions. This allows us to continue
parsing the struct's fields, avoiding spurious 'missing field' errors in
code that tries to use the struct.
Handle `macro_rules!` tokens consistently across crates
When we serialize a `macro_rules!` macro, we used a 'lowered' `TokenStream` for its body, which has all `Nonterminal`s expanded in-place via `nt_to_tokenstream`. This matters when an 'outer' `macro_rules!` macro expands to an 'inner' `macro_rules!` macro - the inner macro may use tokens captured from the 'outer' macro in its definition.
This means that invoking a foreign `macro_rules!` macro may use a different body `TokenStream` than when the same `macro_rules!` macro is invoked in the same crate. This difference is observable by proc-macros invoked by a `macro_rules!` macro - a `None`-delimited group will be seen in the same-crate case (inserted when convering `Nonterminal`s to the `proc_macro` crate's structs), but no `None`-delimited group in the cross-crate case.
To fix this inconsistency, we now insert `None`-delimited groups when 'lowering' a `Nonterminal` `macro_rules!` body, just as we do in `proc_macro_server`. Additionally, we no longer print extra spaces for `None`-delimited groups - as far as pretty-printing is concerned, they don't exist (only their contents do). This ensures that `Display` output of a `TokenStream` does not depend on which crate a `macro_rules!` macro was invoked from.
This PR is necessary in order to patch the `solana-genesis-programs` for the upcoming hygiene serialization breakage (https://github.com/rust-lang/rust/pull/72121#issuecomment-646924847). The `solana-genesis-programs` crate will need to use a proc macro to re-span certain tokens in a nested `macro_rules!`, which requires us to consistently use a `None`-delimited group.
See `src/test/ui/proc-macro/nested-macro-rules.rs` for an example of the kind of nested `macro_rules!` affected by this crate.
Provide more information on duplicate lang item error.
This gives some notes on the location of the files where the lang items were loaded from. Some duplicate lang item errors can be a little confusing, and this might help in diagnosing what has happened.
Here's an example when hitting a bug with Cargo's build-std:
```
error: duplicate lang item in crate `core` (which `rustc_std_workspace_core` depends on): `try`.
|
= note: the lang item is first defined in crate `core` (which `z10` depends on)
= note: first definition in `core` loaded from /Users/eric/Proj/rust/cargo/scratch/z10/target/target/debug/deps/libcore-a764da499c7385f4.rmeta
= note: second definition in `core` loaded from /Users/eric/Proj/rust/cargo/scratch/z10/target/target/debug/deps/libcore-5b082675aea34986.rmeta
```
expand: Stop using nonterminals for passing tokens to attribute and derive macros
Make one more step towards fully token-based expansion and fix issues described in https://github.com/rust-lang/rust/issues/72545#issuecomment-640276791.
Now `struct S;` is passed to `foo!(struct S;)` and `#[foo] struct S;` in the same way - as a token stream `struct S ;`, rather than a single non-terminal token `NtItem` which is then broken into parts later.
The cost is making pretty-printing of token streams less pretty.
Some of the pretty-printing regressions will be recovered by keeping jointness with each token, which we will need to do anyway.
Unfortunately, this is not exactly the same thing as https://github.com/rust-lang/rust/pull/73102.
One more observable effect is how `$crate` is printed in the attribute input.
Inside `NtItem` was printed as `crate` or `that_crate`, now as a part of a token stream it's printed as `$crate` (there are good reasons for these differences, see https://github.com/rust-lang/rust/pull/62393 and related PRs).
This may break old proc macros (custom derives) written before the main portion of the proc macro API (macros 1.2) was stabilized, those macros did `input.to_string()` and reparsed the result, now that result can contain `$crate` which cannot be reparsed.
So, I think we should do this regardless, but we need to run crater first.
r? @Aaron1011
Remove legacy InnoSetup GUI installer
On Windows the InnoSetup `.exe` installer was superseded by the MSI installer long ago. It's no longer needed.
The `.exe` installer hasn't been linked from the [other installation methods](https://forge.rust-lang.org/infra/other-installation-methods.html#standalone) page in many years. As far as I can tell the intent was always to remove this installer once the MSI proved itself. Though admittedly both installers feel very "legacy" at this point.
Removing this would mean we only maintain one Windows GUI installer and would speed up the distribution phase.
As a result of removing InnoSetup, this closes#24397
Test UI tests for pass=check
I'm going to just compare the builder times since I wasn't able to get this working nicely locally (hit some obscure linker error).
Fixes part of #69823
