Rollup of 7 pull requests #95911
Closed
Rollup of 7 pull requests #95911
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This is currently a wrapper to `SymbolExportLevel` but it allows later addition of extra information.
We may sometimes emit an `invoke` instead of a `call` for inline assembly during the MIR -> LLVM IR lowering. But we failed to update the IR builder's current basic block before writing the results to the outputs. This would result in invalid IR because the basic block would end in a `store` instruction, which isn't a valid terminator.
Implement sym operands for global_asm! Tracking issue: rust-lang#93333 This PR is pretty much a complete rewrite of `sym` operand support for inline assembly so that the same implementation can be shared by `asm!` and `global_asm!`. The main changes are: - At the AST level, `sym` is represented as a special `InlineAsmSym` AST node containing a path instead of an `Expr`. - At the HIR level, `sym` is split into `SymStatic` and `SymFn` depending on whether the path resolves to a static during AST lowering (defaults to `SynFn` if `get_early_res` fails). - `SymFn` is just an `AnonConst`. It runs through typeck and we just collect the resulting type at the end. An error is emitted if the type is not a `FnDef`. - `SymStatic` directly holds a path and the `DefId` of the `static` that it is pointing to. - The representation at the MIR level is mostly unchanged. There is a minor change to THIR where `SymFn` is a constant instead of an expression. - At the codegen level we need to apply the target's symbol mangling to the result of `tcx.symbol_name()` depending on the target. This is done by calling the LLVM name mangler, which handles all of the details. - On Mach-O, all symbols have a leading underscore. - On x86 Windows, different mangling is used for cdecl, stdcall, fastcall and vectorcall. - No mangling is needed on other platforms. r? ``@nagisa`` cc ``@eddyb``
Generate synthetic object file to ensure all exported and used symbols participate in the linking Fix rust-lang#50007 and rust-lang#47384 This is the synthetic object file approach that I described in rust-lang#95363 (comment), allowing all exported and used symbols to be linked while still allowing them to be GCed. Related rust-lang#93791, rust-lang#95363 r? `@petrochenkov` cc `@carbotaniuman`
feat: Allow usage of sudo [while not accessing root] in x.py # Fixes This PR should fix rust-lang#93344 # Info Allows usage of sudo (while not accessing root) in x.py
…bank Only suggest removing semicolon when expression is compatible with `impl Trait` rust-lang#54771 (comment) > It still needs checking that the last statement's expr can actually conform to the trait, but the naïve behavior is there. Only suggest removing a semicolon when the type behind the semicolon actually implements the trait in an RPIT `-> impl Trait`. Also upgrade the label that suggests removing the semicolon to a suggestion (should it be verbose?). cc rust-lang#54771
…an-DPC Note that CI tests Windows 10 Currently being [discussed on Zulip](https://rust-lang.zulipchat.com/#narrow/stream/219381-t-libs/topic/Windows.207). r? `@joshtriplett`
…compile, r=Amanieu
Fix miscompilation of inline assembly with outputs in cases where we emit an invoke instead of call instruction.
We ran into this bug where rustc would segfault while trying to compile certain uses of inline assembly.
Here is a simple repro that demonstrates the issue:
```rust
#![feature(asm_unwind)]
fn main() {
let _x = String::from("string here just cause we need something with a non-trivial drop");
let foo: u64;
unsafe {
std::arch::asm!(
"mov {}, 1",
out(reg) foo,
options(may_unwind)
);
}
println!("{}", foo);
}
```
([playground link](https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=7d6641e83370d2536a07234aca2498ff))
But crucially `feature(asm_unwind)` is not actually needed and this can be triggered on stable as a result of the way async functions/generators are handled in the compiler. e.g.:
```rust
extern crate futures; // 0.3.21
async fn bar() {
let foo: u64;
unsafe {
std::arch::asm!(
"mov {}, 1",
out(reg) foo,
);
}
println!("{}", foo);
}
fn main() {
futures::executor::block_on(bar());
}
```
([playground link](https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=1c7781c34dd4a3e80ae4bd936a0c82fc))
An example of the incorrect LLVM generated:
```llvm
bb1: ; preds = %start
%1 = invoke i64 asm sideeffect alignstack inteldialect unwind "mov ${0:q}, 1", "=&r,~{dirflag},~{fpsr},~{flags},~{memory}"()
to label %bb2 unwind label %cleanup, !srcloc !9
store i64 %1, i64* %foo, align 8
bb2:
[...snip...]
```
The store should not be placed after the asm invoke but rather should be in the normal control flow basic block (`bb2` in this case).
[Here](https://gist.github.com/luqmana/be1af5b64d2cda5a533e3e23a7830b44) is a writeup of the investigation that lead to finding this.
…rmat, r=compiler-errors Use `to_string` instead of `format!`
rustbot
added
T-compiler
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Successful merges:
impl Trait#95758 (Only suggest removing semicolon when expression is compatible withimpl Trait)to_stringinstead offormat!#95881 (Useto_stringinstead offormat!)Failed merges:
r? @ghost
@rustbot modify labels: rollup
Create a similar rollup