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- Consolidate calculation of the effective value.
- Check the target `DebuginfoKind` instead of using `is_like_msvc`.
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show linker output even if the linker succeeds
Show stderr and stderr by default, controlled by a new `linker_messages` lint.
fixes https://github.com/rust-lang/rust/issues/83436. fixes https://github.com/rust-lang/rust/issues/38206. cc https://rust-lang.zulipchat.com/#narrow/stream/233931-t-compiler.2Fmajor-changes/topic/uplift.20some.20-Zverbose.20calls.20and.20rename.20to.E2.80.A6.20compiler-team.23706/near/408986134
<!-- try-job: dist-x86_64-msvc -->
try-job: aarch64-apple
r? `@bjorn3`
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note that this still ICEs when passed `-Z link-only --error-format json` because i can't be bothered to fix it right now
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It only exists to pass some information from one part of the driver to
another part. We can directly pass this information to the function that
needs it to reduce the amount of mutation of the Session.
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It is effectively a global resource and the jobserver::Client in Session
was a clone of GLOBAL_CLIENT anyway.
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And pass this to the individual emitters when necessary.
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rust_for_linux: -Zreg-struct-return commandline flag for X86 (#116973)
Command line flag `-Zreg-struct-return` for X86 (32-bit) for rust-for-linux.
This flag enables the same behavior as the `abi_return_struct_as_int` target spec key.
- Tracking issue: https://github.com/rust-lang/rust/issues/116973
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for small rustc_driver programs, most of their imports will currently be related to diagnostics. this change simplifiers their code so it's more clear what in the driver is modified from the default.
this is especially important for external drivers which are out of tree and not updated in response to breaking changes. for these drivers, each import is a liability for future code, since it can be broken when refactors happen.
here is an example driver which is simplified by these changes:
```
diff --git a/src/main.rs b/src/main.rs
index f81aa3e..11e5f18 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,16 +1,8 @@
#![feature(rustc_private)]
extern crate rustc_driver;
extern crate rustc_interface;
-extern crate rustc_errors;
-extern crate rustc_session;
use rustc_driver::Callbacks;
-use rustc_errors::{emitter::HumanReadableErrorType, ColorConfig};
use rustc_interface::interface;
-use rustc_session::config::ErrorOutputType;
-use rustc_session::EarlyDiagCtxt;
struct DisableSafetyChecks;
@@ -26,11 +18,7 @@ fn main() {
"https://github.com/jyn514/jyn514.github.io/issues/new",
|_| (),
);
- let handler = EarlyDiagCtxt::new(ErrorOutputType::HumanReadable(
- HumanReadableErrorType::Default,
- ColorConfig::Auto,
- ));
- rustc_driver::init_rustc_env_logger(&handler);
+ rustc_driver::init_rustc_env_logger(&Default::default());
std::process::exit(rustc_driver::catch_with_exit_code(move || {
let args: Vec<String> = std::env::args().collect();
rustc_driver::RunCompiler::new(&args, &mut DisableSafetyChecks).run()
```
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Over in Zed we've noticed that loading crates for a large-ish workspace can take almost 200ms. We've pinned it down to how rustc searches for paths, as it performs a linear search over the list of candidate paths. In our case the candidate list had about 20k entries which we had to iterate over for each dependency being loaded.
This commit introduces a simple FilesIndex that's just a sorted Vec under the hood. Since crates are looked up by both prefix and suffix, we perform a range search on said Vec (which constraints the search space based on prefix) and follow up with a linear scan of entries with matching suffixes.
FilesIndex is also pre-filtered before any queries are performed using available target information; query prefixes/sufixes are based on the target we are compiling for, so we can remove entries that can never match up front.
Overall, this commit brings down build time for us in dev scenarios by about 6%.
100ms might not seem like much, but this is a constant cost that each of our workspace crates has to pay, even when said crate is miniscule.
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Add Unicode block-drawing compiler output support
Add nightly-only theming support to rustc output using Unicode box
drawing characters instead of ASCII-art to draw the terminal UI.
In order to enable, the flags `-Zunstable-options=yes --error-format=human-unicode` must be passed in.
After:
```
error: foo
╭▸ test.rs:3:3
│
3 │ X0 Y0 Z0
│ ┌───╿──│──┘
│ ┌│───│──┘
│ ┏││━━━┙
│ ┃││
4 │ ┃││ X1 Y1 Z1
5 │ ┃││ X2 Y2 Z2
│ ┃│└────╿──│──┘ `Z` label
│ ┃└─────│──┤
│ ┗━━━━━━┥ `Y` is a good letter too
│ `X` is a good letter
╰╴
note: bar
╭▸ test.rs:4:3
│
4 │ ┏ X1 Y1 Z1
5 │ ┃ X2 Y2 Z2
6 │ ┃ X3 Y3 Z3
│ ┗━━━━━━━━━━┛
├ note: bar
╰ note: baz
note: qux
╭▸ test.rs:4:3
│
4 │ X1 Y1 Z1
╰╴ ━━━━━━━━
```
Before:
```
error: foo
--> test.rs:3:3
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3 | X0 Y0 Z0
| ___^__-__-
| |___|__|
| ||___|
| |||
4 | ||| X1 Y1 Z1
5 | ||| X2 Y2 Z2
| |||____^__-__- `Z` label
| ||_____|__|
| |______| `Y` is a good letter too
| `X` is a good letter
|
note: bar
--> test.rs:4:3
|
4 | / X1 Y1 Z1
5 | | X2 Y2 Z2
6 | | X3 Y3 Z3
| |__________^
= note: bar
= note: baz
note: qux
--> test.rs:4:3
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4 | X1 Y1 Z1
| ^^^^^^^^
```
After:
Before:
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Add nightly-only theming support to rustc output using Unicode box
drawing characters instead of ASCII-art to draw the terminal UI:
After:
```
error: foo
╭▸ test.rs:3:3
│
3 │ X0 Y0 Z0
│ ┌───╿──│──┘
│ ┌│───│──┘
│ ┏││━━━┙
│ ┃││
4 │ ┃││ X1 Y1 Z1
5 │ ┃││ X2 Y2 Z2
│ ┃│└────╿──│──┘ `Z` label
│ ┃└─────│──┤
│ ┗━━━━━━┥ `Y` is a good letter too
│ `X` is a good letter
╰╴
note: bar
╭▸ test.rs:4:3
│
4 │ ┏ X1 Y1 Z1
5 │ ┃ X2 Y2 Z2
6 │ ┃ X3 Y3 Z3
│ ┗━━━━━━━━━━┛
├ note: bar
╰ note: baz
note: qux
╭▸ test.rs:4:3
│
4 │ X1 Y1 Z1
╰╴ ━━━━━━━━
```
Before:
```
error: foo
--> test.rs:3:3
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3 | X0 Y0 Z0
| ___^__-__-
| |___|__|
| ||___|
| |||
4 | ||| X1 Y1 Z1
5 | ||| X2 Y2 Z2
| |||____^__-__- `Z` label
| ||_____|__|
| |______| `Y` is a good letter too
| `X` is a good letter
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note: bar
--> test.rs:4:3
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4 | / X1 Y1 Z1
5 | | X2 Y2 Z2
6 | | X3 Y3 Z3
| |__________^
= note: bar
= note: baz
note: qux
--> test.rs:4:3
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4 | X1 Y1 Z1
| ^^^^^^^^
```
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This changes the naming to the new naming, used by `--print
target-tuple`.
It does not change all locations, but many.
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MCP: https://github.com/rust-lang/compiler-team/issues/782
Co-authored-by: bjorn3 <17426603+bjorn3@users.noreply.github.com>
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deprecate -Csoft-float because it is unsound (and not fixable)
See https://github.com/rust-lang/rust/issues/129893 for details. The general sentiment there seems to be that this flag has no use and sound alternatives exist, so let's add this warning and see if anyone out there disagrees.
Also show a different warning on targets where it does nothing (as documented since https://github.com/rust-lang/rust/pull/36261): it seems to correspond to `-mfloat-abi` in GCC/clang, which is an ARM-specific option. To be really sure it does nothing, only forward the flag to LLVM for eabihf targets. This should not change behavior but makes me sleep better ;)
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This flag allows specifying the threshold size above which LLVM should
not consider placing small objects in a .sdata or .sbss section.
Support is indicated in the target options via the
small-data-threshold-support target option, which can indicate either an
LLVM argument or an LLVM module flag. To avoid duplicate specifications
in a large number of targets, the default value for support is
DefaultForArch, which is translated to a concrete value according to the
target's architecture.
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rustc: Simplify getting sysroot library directory
It was very non-obvious that `sess.target_tlib_path`, `make_target_lib_path(...)`, and `sess.target_filesearch(...).search_paths()` result in the same sysroot library directory paths.
They are however, indeed the same, because `sess.target_tlib_path` is initialized to `make_target_lib_path(...)` on `Session` creation, and they are used interchangeably.
There are still some redundant calls to `make_target_lib_path` and other inconsistent ways to obtain sysroot directories, but fixing that requires some behavior changes, while this PR is a pure refactoring.
Some places in the compiler even disagree on the number of sysroots - 1 (explicit `--sysroot` *or* default sysroot), 2 (explicit `--sysroot` *and* default sysroot), or an unclear number of `sysroot_candidates` every of which is considered.
The logic currently using `sess.target_tlib_path` or equivalents assumes one sysroot.
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Implement `-Z embed-source` (DWARFv5 source code embedding extension)
Implement https://github.com/rust-lang/compiler-team/issues/764 MCP which adds an unstable flag that exposes LLVM's [DWARFv5 source code embedding](https://dwarfstd.org/issues/180201.1.html) support.
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dingxiangfei2009:allow-shadow-call-stack-sanitizer, r=tmandry
Unconditionally allow shadow call-stack sanitizer for AArch64
It is possible to do so whenever `-Z fixed-x18` is applied.
cc ``@Darksonn`` for context
The reasoning is that, as soon as reservation on `x18` is forced through the flag `fixed-x18`, on AArch64 the option to instrument with [Shadow Call Stack sanitizer](https://clang.llvm.org/docs/ShadowCallStack.html) is then applicable regardless of the target configuration.
At the every least, we would like to relax the restriction on specifically `aarch64-unknonw-none`. For this option, we can include a documentation change saying that users of compiled objects need to ensure that they are linked to runtime with Shadow Call Stack instrumentation support.
Related: #121972
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applied
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The previous setup tied two unrelated things together. Splitting these two is a better model.
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The previous commit updated `rustfmt.toml` appropriately. This commit is
the outcome of running `x fmt --all` with the new formatting options.
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Replace all `&DiagCtxt` with a `DiagCtxtHandle<'_>` wrapper type
r? `@davidtwco`
This paves the way for tracking more state (e.g. error tainting) in the diagnostic context handle
Basically I will add a field to the `DiagCtxtHandle` that refers back to the `InferCtxt`'s (and others) `Option<ErrorHandled>`, allowing us to immediately taint these contexts when emitting an error and not needing manual tainting anymore (which is easy to forget and we don't do in general anyway)
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This paves the way for tracking more state (e.g. error tainting) in the diagnostic context handle
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When set, this flag skips the code that normally extracts coverage spans from
MIR statements and terminators. That sometimes makes it easier to debug branch
coverage and MC/DC coverage, because the coverage output is less noisy.
For internal debugging only. If other code changes would make it hard to keep
supporting this flag, remove it.
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rust-lld: fallback to rustc's sysroot if there's no path to the linker in the target sysroot
As seen in #125246, some sysroots don't expect to contain `rust-lld` and want to keep it that way, so we fallback to the default rustc sysroot if there is no path to the linker in any of the sysroot tools search paths. This is how we locate codegen-backends' dylibs already.
People also have requested an error if none of these search paths contain the self-contained linker directory, so there's also an error in that case.
r? `@petrochenkov` cc `@ehuss` `@RalfJung`
I'm not sure where we check for `rust-lld`'s existence on the targets where we use it by default, and if we just ignore it when missing or emit a warning (as I assume we don't emit an error), so I just checked for the existence of `gcc-ld`, where `cc` will look for the lld-wrapper binaries.
<sub>*Feel free to point out better ways to do this, it's the middle of the night here.*</sub>
Fixes #125246
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located
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Relax restrictions on multiple sanitizers
Most combinations of LLVM sanitizers are legal-enough to enable simultaneously. This change will allow simultaneously enabling ASAN and shadow call stacks on supported platforms.
I used this python script to generate the mutually-exclusive sanitizer combinations:
```python
#!/usr/bin/python3
import subprocess
flags = [
["-fsanitize=address"],
["-fsanitize=leak"],
["-fsanitize=memory"],
["-fsanitize=thread"],
["-fsanitize=hwaddress"],
["-fsanitize=cfi", "-flto", "-fvisibility=hidden"],
["-fsanitize=memtag", "--target=aarch64-linux-android", "-march=armv8a+memtag"],
["-fsanitize=shadow-call-stack"],
["-fsanitize=kcfi", "-flto", "-fvisibility=hidden"],
["-fsanitize=kernel-address"],
["-fsanitize=safe-stack"],
["-fsanitize=dataflow"],
]
for i in range(len(flags)):
for j in range(i):
command = ["clang++"] + flags[i] + flags[j] + ["-o", "main.o", "-c", "main.cpp"]
completed = subprocess.run(command, stderr=subprocess.DEVNULL)
if completed.returncode != 0:
first = flags[i][0][11:].replace('-', '').upper()
second = flags[j][0][11:].replace('-', '').upper()
print(f"(SanitizerSet::{first}, SanitizerSet::{second}),")
```
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Most combinations of LLVM sanitizers are legal-enough to enable
simultaneously. This change will allow simultaneously enabling ASAN and
shadow call stacks on supported platforms.
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Move `SourceMap` initialization
So it happens at the same time as `SessionGlobals` initialization, rather than shortly afterward.
r? `@WaffleLapkin`
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sess: stabilize `-Zrelro-level` as `-Crelro-level`
Stabilise `-Zrelro-level` as `-Crelro-level`. There's no tracking issue for this flag to close.
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Currently it's a method on `EarlyDiagCtxt`, which is not the right place
for it at all -- `EarlyDiagCtxt` is used to issue diagnostics, but
shouldn't be doing any of the actual checking.
This commit moves it into a standalone function that takes an
`EarlyDiagCtxt` as an argument, which is more sensible. This does
require adding `EarlyDiagCtxt::early_struct_warn`, so a warning can be
returned and then modified with a note. (And that likely explains why
somebody put `initialize_checked_jobserver` into `EarlyDiagCtxt` in the
first place.)
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