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Don't format!() string literals
Prefer `to_string()` to `format!()` take 2, this time targetting string literals. In some cases (`&format!("...")` -> `"..."`) also removes allocations. Occurences of `format!("")` are changed to `String::new()`.
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Prefer to_string() to format!()
Simple benchmarks suggest in some cases it can be faster by even 37%:
```
test converting_f64_long ... bench: 339 ns/iter (+/- 199)
test converting_f64_short ... bench: 136 ns/iter (+/- 34)
test converting_i32_long ... bench: 87 ns/iter (+/- 16)
test converting_i32_short ... bench: 87 ns/iter (+/- 49)
test converting_str ... bench: 54 ns/iter (+/- 15)
test formatting_f64_long ... bench: 349 ns/iter (+/- 176)
test formatting_f64_short ... bench: 145 ns/iter (+/- 14)
test formatting_i32_long ... bench: 98 ns/iter (+/- 14)
test formatting_i32_short ... bench: 93 ns/iter (+/- 15)
test formatting_str ... bench: 86 ns/iter (+/- 23)
```
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This commit stabilizes the `#[wasm_import_module]` attribute as
`#[link(wasm_import_module = "...")]`. Tracked by #52090 this new directive in
the `#[link]` attribute is used to configured the module name that the imports
are listed with. The WebAssembly specification indicates two utf-8 names are
associated with all imported items, one for the module the item comes from and
one for the item itself. The item itself is configurable in Rust via its
identifier or `#[link_name = "..."]`, but the module name was previously not
configurable and defaulted to `"env"`. This commit ensures that this is also
configurable.
Closes #52090
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This reverts commit f6894ebe664d111259a91a2b5fcc1236ca413436.
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r=alexcrichton
Preliminary work for incremental ThinLTO.
Since implementing incremental ThinLTO is a bit more involved than I initially thought, I'm splitting out some of the things that already work. This PR (1) adds a way accessing some ThinLTO information in `rustc` and (2) does some cleanup around CGU/object file naming (which makes things quite a bit nicer).
This is probably best reviewed one commit at a time.
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This commit upgrades the main LLVM submodule to LLVM's current master branch.
The LLD submodule is updated in tandem as well as compiler-builtins.
Along the way support was also added for LLVM 7's new features. This primarily
includes the support for custom section concatenation natively in LLD so we now
add wasm custom sections in LLVM IR rather than having custom support in rustc
itself for doing so.
Some other miscellaneous changes are:
* We now pass `--gc-sections` to `wasm-ld`
* The optimization level is now passed to `wasm-ld`
* A `--stack-first` option is passed to LLD to have stack overflow always cause
a trap instead of corrupting static data
* The wasm target for LLVM switched to `wasm32-unknown-unknown`.
* The syntax for aligned pointers has changed in LLVM IR and tests are updated
to reflect this.
* The `thumbv6m-none-eabi` target is disabled due to an [LLVM bug][llbug]
Nowadays we've been mostly only upgrading whenever there's a major release of
LLVM but enough changes have been happening on the wasm target that there's been
growing motivation for quite some time now to upgrade out version of LLD. To
upgrade LLD, however, we need to upgrade LLVM to avoid needing to build yet
another version of LLVM on the builders.
The revision of LLVM in use here is arbitrarily chosen. We will likely need to
continue to update it over time if and when we discover bugs. Once LLVM 7 is
fully released we can switch to that channel as well.
[llbug]: https://bugs.llvm.org/show_bug.cgi?id=37382
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Shorten the line to make tidy happy.
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Update error prompt message to indicate that VS 2017 is supported (for a while now).
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This fixes (only for -crt-static) #36710.
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This reverts commit a5a875d17b34b61326d803eb2edea526d3bd6914.
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This reverts commit 6d9154a830dd9773fe8a4e34e1fc3dfb1ca6f935.
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