Wrap bundled static libraries into object files
Fixes#103044 (not sure, couldn't test locally)
Bundled static libraries should be wrapped into object files as it's done for metadata file.
r? `@petrochenkov`
Implement the `+whole-archive` modifier for `wasm-ld`
This implements the `Linker::{link_whole_staticlib,link_whole_rlib}` methods for the `WasmLd` linker used on wasm targets. Previously these methods were noops since I think historically `wasm-ld` did not have support for `--whole-archive` but nowadays it does, so the flags are passed through.
Add type_array to BaseTypeMethods
Moved `type_array` function to `rustc_codegen_ssa::BaseTypeMethods` trait. This allows using normal `alloca` function to create arrays as suggested in https://github.com/rust-lang/rust/pull/104022.
Signed-off-by: Ayush Singh <ayushsingh1325@gmail.com>
Moved type_array function to rustc_codegen_ssa::BaseTypeMethods trait.
This allows using normal alloca function to create arrays as suggested in
https://github.com/rust-lang/rust/pull/104022.
Signed-off-by: Ayush Singh <ayushsingh1325@gmail.com>
[debuginfo] Make cpp-like debuginfo type names for slices and str consistent.
Before this PR, the compiler would emit the debuginfo name `slice$<T>` for all kinds of slices, regardless of whether they are behind a reference or not and regardless of the kind of reference. As a consequence, the types `Foo<&[T]>`, `Foo<[T]>`, and `Foo<&mut [T]>` would end up with the same type name `Foo<slice$<T> >` in debuginfo, making it impossible to disambiguate between them by name. Similarly, `&str` would get the name `str` in debuginfo, so the debuginfo name for `Foo<str>` and `Foo<&str>` would be the same. In contrast, `*const [bool]` and `*mut [bool]` would be `ptr_const$<slice$<bool> >` and `ptr_mut$<slice$<bool> >`, i.e. the encoding does not lose information about the type.
This PR removes all special handling for slices and `str`. The types `&[bool]`, `&mut [bool]`, and `&str` thus get the names `ref$<slice2$<bool> >`, `ref_mut$<slice2$<bool> >`, and `ref$<str$>` respectively -- as one would expect.
The new special name for slices is `slice2$` to differentiate it from the previous name `slice$`, which has different semantics. The same is true for `str` and `str$`. This kind of versioning already has a precedent with the case of `enum$` and `enum2$` and hopefully will make it easier to transition existing consumers of these names.
cc `@rust-lang/wg-debugging` `@vadimcn`
r? `@wesleywiser`
UPDATE: Here is a table to clarify the changes
| Rust type | DWARF name | C++-like name (before) | C++-like name (after) |
|-----------|------------|------------------------|------------------------|
| `[T]` | `[T]` | `slice$<T>` | `slice2$<T>` |
| `&[T]` | `&[T]` | `slice$<T>` | `ref$<slice2$<T> >` |
| `&mut [T]` | `&mut [T]` | `slice$<T>` | `ref_mut$<slice2$<T> >`|
| `str` | `str` | `str` | `str$` |
| `&str` | `&str` | `str` | `ref$<str$>` |
| `&mut str` | `&mut str` | `str` | `ref_mut$<str$>`|
| `*const [T]` | `*const [T]` | `ptr_const$<slice$<T> >` | `ptr_const$<slice2$<T> >` |
| `*mut [T]` | `*mut [T]` | `ptr_mut$<slice$<T> >` | `ptr_mut$<slice2$<T> >` |
As you can see, before the PR many types would end up with the same name, making it impossible to distinguish between them in NatVis or other places where types are matched or looked up by name. The DWARF version of names is not changed.
improve `filesearch::get_or_default_sysroot`
`fn get_or_default_sysroot` is now improved and used in `miri` and `clippy`, and tests are still passing as they should. So we no longer need to implement custom workarounds/hacks to find sysroot in tools like miri/clippy.
Resolves https://github.com/rust-lang/rust/issues/98832
re-opened from #103581
FIX - StrippingDebugInfoFailed typo
DELETE - unneeded FIXME comment
UPDATE - only declare the error with ExtractBundledLibsError as an enum and use the Diagnostic derive macro
Add `multivalue` target feature to WASM target
This PR is similar to #99643 and #97808. It addresses #96472 for the `multivalue` target feature.
The problem I am trying to fix is to remove the following warning when compiling with `-C target-feature=+multivalue` for `--target=wasm32-unknown-unknown`.
```
warning: unknown feature specified for `-Ctarget-feature`: `multivalue`
|
= note: it is still passed through to the codegen backend
= note: consider filing a feature request
```
The new implementation doesn't use weak lang items and instead changes
`#[alloc_error_handler]` to an attribute macro just like
`#[global_allocator]`.
The attribute will generate the `__rg_oom` function which is called by
the compiler-generated `__rust_alloc_error_handler`. If no `__rg_oom`
function is defined in any crate then the compiler shim will call
`__rdl_oom` in the alloc crate which will simply panic.
This also fixes link errors with `-C link-dead-code` with
`default_alloc_error_handler`: `__rg_oom` was previously defined in the
alloc crate and would attempt to reference the `oom` lang item, even if
it didn't exist. This worked as long as `__rg_oom` was excluded from
linking since it was not called.
This is a prerequisite for the stabilization of
`default_alloc_error_handler` (#102318).
Before this PR, the compiler would emit the debuginfo name `slice$<T>`
for all kinds of slices, regardless of whether they are behind a
reference or not and regardless of the kind of reference. As a
consequence, the types `Foo<&[T]>`, `Foo<[T]>`, and `Foo<&mut [T]>`
would end up with the same type name `Foo<slice$<T> >` in debuginfo,
making it impossible to disambiguate between them by name. Similarly,
`&str` would get the name `str` in debuginfo, so the debuginfo name for
`Foo<str>` and `Foo<&str>` would be the same. In contrast,
`*const [bool]` and `*mut [bool]` would be `ptr_const$<slice$<bool> >`
and `ptr_mut$<slice$<bool> >`, i.e. the encoding does not lose
information about the type.
This PR removes all special handling for slices and `str`. The types
`&[bool]`, `&mut [bool]`, and `&str` thus get the names
`ref$<slice2$<bool> >`, `ref_mut$<slice2$<bool> >`, and
`ref$<str$>` respectively -- as one would expect.
`codegen_switchint_terminator` already uses `br` instead of `switch`
when there is one normal target plus the `otherwise` target. But there's
another common case with two normal targets and an `otherwise` target
that points to an empty unreachable BB. This comes up a lot when
switching on the tags of enums that use niches.
The pattern looks like this:
```
bb1: ; preds = %bb6
%3 = load i8, ptr %_2, align 1, !range !9, !noundef !4
%4 = sub i8 %3, 2
%5 = icmp eq i8 %4, 0
%_6 = select i1 %5, i64 0, i64 1
switch i64 %_6, label %bb3 [
i64 0, label %bb4
i64 1, label %bb2
]
bb3: ; preds = %bb1
unreachable
```
This commit adds code to convert the `switch` to a `br`:
```
bb1: ; preds = %bb6
%3 = load i8, ptr %_2, align 1, !range !9, !noundef !4
%4 = sub i8 %3, 2
%5 = icmp eq i8 %4, 0
%_6 = select i1 %5, i64 0, i64 1
%6 = icmp eq i64 %_6, 0
br i1 %6, label %bb4, label %bb2
bb3: ; No predecessors!
unreachable
```
This has a surprisingly large effect on compile times, with reductions
of 5% on debug builds of some crates. The reduction is all due to LLVM
taking less time. Maybe LLVM is just much better at handling `br` than
`switch`.
The resulting code is still suboptimal.
- The `icmp`, `select`, `icmp` sequence is silly, converting an `i1` to an `i64`
and back to an `i1`. But with the current code structure it's hard to avoid,
and LLVM will easily clean it up, in opt builds at least.
- `bb3` is usually now truly dead code (though not always, so it can't
be removed universally).
`TerminatorCodegenHelper` has three methods `llblock`, `llbb`, and
`lltarget`. They're all similar, but the names given no indication of
the differences.
This commit renames `lltarget` as `llbb_with_landing_pad`, and `llblock`
as `llbb_with_cleanup`. These aren't fantastic names, but at least it's
now clear that `llbb` is the lowest-level of the three and the other two
wrap it.
Ensure:
- builders always have a `bx` suffix;
- backend basic blocks always have an `llbb` suffix,
- paired builders and basic blocks have consistent prefixes.
Remove byte swap of valtree hash on big endian
This addresses problem reported in #103183. The code was originally introduced in e14b34c386. (see https://github.com/rust-lang/rust/pull/96591)
On big-endian environment, this operation sequence actually put the other half from 128-bit result, thus we got different hash result on LE and BE.
Get rid of native_library projection queries
They don't seem particularly useful as I don't expect native libraries to change frequently.
Maybe they do provide significant value of keeping incremental compilation green though, I'm not sure.
linker: Fix weak lang item linking with combination windows-gnu + LLD + LTO
In https://github.com/rust-lang/rust/pull/100404 this logic was originally disabled for MSVC due to issues with LTO, but the same issues appear on windows-gnu with LLD because that LLD uses the same underlying logic as MSVC LLD, just with re-syntaxed command line options.
So this PR just disables it for LTO builds in general.
