Upstream change
llvm/llvm-project@6b539f5eb8 changed
`isSectionBitcode` works and it now only respects `.llvm.lto` sections
instead of also `.llvmbc`, which it says was never intended to be used
for LTO. We instead load sections by name, and sniff for raw bitcode by
hand.
r? @nikic
@rustbot label: +llvm-main
Represent MIR composite debuginfo as projections instead of aggregates
Composite debuginfo for MIR is currently represented as
```
debug name => Type { projection1 => place1, projection2 => place2 };
```
ie. a single `VarDebugInfo` object with that name, and its value a `VarDebugInfoContents::Composite`.
This PR proposes to reverse the representation to be
```
debug name.projection1 => place1;
debug name.projection2 => place2;
```
ie. multiple `VarDebugInfo` objects with each their projection.
This simplifies the handling of composite debuginfo by the compiler by avoiding weird nesting.
Based on https://github.com/rust-lang/rust/pull/115139
Add `FreezeLock` type and use it to store `Definitions`
This adds a `FreezeLock` type which allows mutation using a lock until the value is frozen where it can be accessed lock-free. It's used to store `Definitions` in `Untracked` instead of a `RwLock`. Unlike the current scheme of leaking read guards this doesn't deadlock if definitions is written to after no mutation are expected.
Implement SMIR generic parameter instantiation
Also demonstrates the use of it with a test.
This required a few smaller changes that may conflict with `@ericmarkmartin` work, but should be easy to resolve any conflicts on my end if their stuff lands first.
replace doc occurrences of ItemLikeVisitor
Solves #114885
ItemLikeVisitor used to have comments describing visit patterns. After it was removed, it was moved to `rustc_hir::intravisit` but references in `intravisit.rs` weren't updated.
Fix error report for size overflow from transmute
Fixes#115402
The span in the error reporting always points to the `dst`, this is an old issue, I may open another PR to fix it.
Make if let guard parsing consistent with normal guards
- Add tests that struct expressions are not allowed in `if let` and `while let` (no change, consistent with `if` and `while`)
- Allow struct expressions in `if let` guards (consistent with `if` guards).
r? `@cjgillot`
Closes#93817
cc #51114
Use relative positions inside a SourceFile.
This allows to remove the normalization of start positions for hashing, and simplify allocation of global address space.
cc `@Zoxc`
Rollup of 3 pull requests
Successful merges:
- #114794 (clarify safety documentation of ptr::swap and ptr::copy)
- #115397 (Add support to return value in StableMIR interface and not crash due to compilation error)
- #115559 (implied bounds: do not ICE on unconstrained region vars)
Failed merges:
- #115532 (Implement SMIR generic parameter instantiation)
r? `@ghost`
`@rustbot` modify labels: rollup
Add support to return value in StableMIR interface and not crash due to compilation error
Invoking `StableMir::run()` on a crate that has any compilation error was crashing the entire process. Instead, return a `CompilerError` so the user knows compilation did not succeed. I believe ICE will also be converted to `CompilerError`.
I'm also adding a possibility for the callback to return a value. I think it will be handy for users (at least it was for my current task of implementing a tool to validate stable-mir). However, if people disagree, I can remove that.
Currently we stop compilation, but some users might want to keep going.
This is needed for us to test against rustc tests. Other tools, such as
Kani, also implements parts of their logic as a backend so it is
important for compilation to continue.
Invoking StableMir::run() on a crate that has any compilation error was
crashing the entire process. Instead, return a `CompilerError` so the
user knows compilation did not succeed.
I believe ICE will also be converted to `CompilerError`.
I'm also adding a return value to the callback, because I think it will
be handy for users (at least it was for my current task of implementing
a tool to validate stable-mir). However, if people disagree,
I can remove that.
coverage: Explicitly test the coverage maps produced by codegen/LLVM
Our existing coverage tests verify the output of end-to-end coverage reports, but we don't have any way to test the specific mapping information (code regions and their associated counters) that are emitted by `rustc_codegen_llvm` and LLVM. That makes it harder to to be confident in changes that would modify those mappings (whether deliberately or accidentally).
This PR addresses that by adding a new `coverage-map` test suite that does the following:
- Compiles test files to LLVM IR assembly (`.ll`)
- Feeds those IR files to a custom tool (`src/tools/coverage-dump`) that extracts and decodes coverage mappings, and prints them in a more human-readable format
- Checks the output of that tool against known-good snapshots
---
I recommend excluding the last commit while reviewing the main changes, because that last commit is just ~40 test files copied over from `tests/run-coverage`, plus their blessed coverage-map snapshots and a readme file. Those snapshots aren't really intended to be checked by hand; they're mostly there to increase the chances that an unintended change to coverage maps will be observable (even if it requires relatively specific circumstances to manifest).
Rollup of 7 pull requests
Successful merges:
- #113510 (Document soundness of Integer -> Pointer -> Integer conversions in `const` contexts.)
- #114412 (document our assumptions about symbols provided by the libc)
- #114813 (explain why we can mutate the FPU control word)
- #115523 (improve `AttrTokenStream`)
- #115536 (interpret: make MemPlace, Place, Operand types private to the interpreter)
- #115540 (Support debuginfo for custom MIR.)
- #115563 (llvm-wrapper: adapt for LLVM API change)
r? `@ghost`
`@rustbot` modify labels: rollup
support `{disable,enable}-patch-binaries-for-nix` in configure.py
Provide the control of `patch-binaries-for-nix` flag from configure.py without requiring manual editing.
It's useful when:
bf1e3f31f9/src/bootstrap/bootstrap.py (L661-L667)
Add `fmease` to rustdoc review rotations
`@fmease` asked me if it was okay for them to be part of the rustdoc review rotation. Since they are already reviewing a lot of rustdoc PRs, I think it's fine to add them to the rotation.
What do you think `@rust-lang/rustdoc` ?
r? rust-lang/rustdoc
Retry download of rustc-perf in opt-dist
This should help resolving spurious network errors. It also increases the timeout for the archive download.
r? `@Mark-Simulacrum`
