When trying to access or initialize a nonexistent field, if we can't infer what
field was meant (by virtue of the purported field in the source being a small
Levenshtein distance away from an actual field, suggestive of a typo), issue a
note listing all the available fields. To reduce terminal clutter, we don't
issue the note when we have a `find_best_match_for_name` Levenshtein
suggestion: the suggestion is probably right.
The third argument of the call to `find_best_match_for_name` is changed to
`None`, accepting the default maximum Levenshtein distance of one-third of the
identifier supplied for correction. The previous value of `Some(name.len())`
was overzealous, inappropriately very Levenshtein-distant suggestions when the
attempted field access could not plausibly be a mere typo. For example, if a
struct has fields `mule` and `phone`, but I type `.donkey`, I'd rather the
error have a note listing that the available fields are, in fact, `mule` and
`phone` (which is the behavior induced by this patch) rather than the error
asking "did you mean `phone`?" (which is the behavior on master). The "only
find fits with at least one matching letter" comment was accurate when it was
first introduced in 09d992471 (January 2015), but is a vicious lie in its
present context before a call to `find_best_match_for_name` and must be
destroyed (replacing every letter is a Levenshtein distance of name.len()).
The present author claims that this suffices to resolve#42599.
Improve panic docs for Instant::duration_since
The docs for Instant::duration_since has a confusing section on panicking. It's
much more clear without the second two sentences of description.
Update Rust LLVM bindings for LLVM 5.0
This is the initial set of changes to update the rust llvm bindings for 5.0. The llvm commits necessitating these changes are linked from the tracking issue, #43370.
Ignore stack probe tests on AArch64
Stack probes are only implemented for x86, and as such currently fail on AArch64. This patch ignores those tests on this architecture.
Fixes#43356.
r? @alexcrichton
Rework Rustbuild to an eagerly compiling approach
This introduces a new dependency on `serde`; I don't believe that's a problem since bootstrap is compiled with nightly/beta always so proc macros are available. Compile times are slightly longer -- about 2-3x (30 seconds vs. 10 seconds). I don't think this is too big a problem, especially since recompiling bootstrap is somewhat rare. I think we can remove the dependency on Serde if necessary, though, so let me know.
r? @alexcrichton
std: Cut down #[inline] annotations where not necessary
This PR cuts down on a large number of `#[inline(always)]` and `#[inline]`
annotations in libcore for various core functions. The `#[inline(always)]`
annotation is almost never needed and is detrimental to debug build times as it
forces LLVM to perform inlining when it otherwise wouldn't need to in debug
builds. Additionally `#[inline]` is an unnecessary annoation on almost all
generic functions because the function will already be monomorphized into other
codegen units and otherwise rarely needs the extra "help" from us to tell LLVM
to inline something.
Overall this PR cut the compile time of a [microbenchmark][1] by 30% from 1s to
0.7s.
[1]: https://gist.github.com/alexcrichton/a7d70319a45aa60cf36a6a7bf540dd3a
Pass debugging arguments to emcc
Tells emcc to enable assertions and debugging information for
wasm32-experimental-emscripten. This makes the codegen issues caused by
LLVM bug 33824 manifest more frequently at runtime and improves the wasm
debugging experience.
Less verbose output for unused arguments
Closes#37718
This is my first contribution to rust, so sorry if I'm missing anything!
The output now looks like this:
<img width="831" alt="screen shot 2017-07-18 at 5 01 32 pm" src="https://user-images.githubusercontent.com/12972285/28347566-dbfa9962-6c05-11e7-8730-c2e8062a04cc.png">
It's not the prettiest, but whenever #41850 gets resolved, this should be able to be improved.
**EDIT:** This also does not seem
r? @Mark-Simulacrum
make JSON error byte position start at top of file
The `hi` and `lo` offsets in a span are relative to a `CodeMap`, but this
doesn't seem to be terribly useful for tool consumers who don't have the
codemap, but might want the byte offset within an actual file?
I couldn't get @killercup's [example](https://github.com/rust-lang/rust/issues/35164#issuecomment-301436519) to run, perhaps due to the limitations of the merely-stage-1 compiler that I built (error was `libproc_macro-456500c7095d8fbe.so: cannot open shared object file: No such file or directory`)??—but a dummy project confirms that the byte offsets have successfully been changed to be file-relative—
**Before:**
```
$ cargo run --message-format json
Compiling byte_json v0.1.0 (file:///home/ubuntu/byte_json)
{"message":{"children":[{"children":[],"code":null,"level":"note","message":"#[warn(dead_code)] on by default","rendered":null,"spans":[]}],"code":null,"level":"warning","message":"function is never used: `rah`","rendered":null,"spans":[{"byte_end":100,"byte_start":67,"column_end":2,"column_start":1,"expansion":null,"file_name":"src/foo.rs","is_primary":true,"label":null,"line_end":5,"line_start":3,"suggested_replacement":null,"text":[{"highlight_end":11,"highlight_start":1,"text":"fn rah() {"},{"highlight_end":21,"highlight_start":1,"text":" println!(\"rah!\")"},{"highlight_end":2,"highlight_start":1,"text":"}"}]}]},"package_id":"byte_json 0.1.0 (path+file:///home/ubuntu/byte_json)","reason":"compiler-message","target":{"crate_types":["bin"],"kind":["bin"],"name":"byte_json","src_path":"/home/ubuntu/byte_json/src/main.rs"}}
{"message":{"children":[{"children":[],"code":null,"level":"note","message":"#[warn(dead_code)] on by default","rendered":null,"spans":[]}],"code":null,"level":"warning","message":"function is never used: `alas`","rendered":null,"spans":[{"byte_end":137,"byte_start":102,"column_end":2,"column_start":1,"expansion":null,"file_name":"src/bar.rs","is_primary":true,"label":null,"line_end":3,"line_start":1,"suggested_replacement":null,"text":[{"highlight_end":12,"highlight_start":1,"text":"fn alas() {"},{"highlight_end":22,"highlight_start":1,"text":" println!(\"alas\");"},{"highlight_end":2,"highlight_start":1,"text":"}"}]}]},"package_id":"byte_json 0.1.0 (path+file:///home/ubuntu/byte_json)","reason":"compiler-message","target":{"crate_types":["bin"],"kind":["bin"],"name":"byte_json","src_path":"/home/ubuntu/byte_json/src/main.rs"}}
{"features":[],"filenames":["/home/ubuntu/byte_json/target/debug/byte_json"],"fresh":false,"package_id":"byte_json 0.1.0 (path+file:///home/ubuntu/byte_json)","profile":{"debug_assertions":true,"debuginfo":2,"opt_level":"0","overflow_checks":true,"test":false},"reason":"compiler-artifact","target":{"crate_types":["bin"],"kind":["bin"],"name":"byte_json","src_path":"/home/ubuntu/byte_json/src/main.rs"}}
Finished dev [unoptimized + debuginfo] target(s) in 0.36 secs
Running `target/debug/byte_json`
Hello, world!
```
**After:**
```
$ RUSTC=../rust/build/x86_64-unknown-linux-gnu/stage1/bin/rustc cargo run --message-format json
Compiling byte_json v0.1.0 (file:///home/ubuntu/byte_json)
{"message":{"children":[{"children":[],"code":null,"level":"note","message":"#[warn(dead_code)] on by default","rendered":null,"spans":[]}],"code":null,"level":"warning","message":"function is never used: `rah`","rendered":null,"spans":[{"byte_end":35,"byte_start":2,"column_end":2,"column_start":1,"expansion":null,"file_name":"src/foo.rs","is_primary":true,"label":null,"line_end":5,"line_start":3,"suggested_replacement":null,"text":[{"highlight_end":11,"highlight_start":1,"text":"fn rah() {"},{"highlight_end":21,"highlight_start":1,"text":" println!(\"rah!\")"},{"highlight_end":2,"highlight_start":1,"text":"}"}]}]},"package_id":"byte_json 0.1.0 (path+file:///home/ubuntu/byte_json)","reason":"compiler-message","target":{"crate_types":["bin"],"kind":["bin"],"name":"byte_json","src_path":"/home/ubuntu/byte_json/src/main.rs"}}
{"message":{"children":[{"children":[],"code":null,"level":"note","message":"#[warn(dead_code)] on by default","rendered":null,"spans":[]}],"code":null,"level":"warning","message":"function is never used: `alas`","rendered":null,"spans":[{"byte_end":35,"byte_start":0,"column_end":2,"column_start":1,"expansion":null,"file_name":"src/bar.rs","is_primary":true,"label":null,"line_end":3,"line_start":1,"suggested_replacement":null,"text":[{"highlight_end":12,"highlight_start":1,"text":"fn alas() {"},{"highlight_end":22,"highlight_start":1,"text":" println!(\"alas\");"},{"highlight_end":2,"highlight_start":1,"text":"}"}]}]},"package_id":"byte_json 0.1.0 (path+file:///home/ubuntu/byte_json)","reason":"compiler-message","target":{"crate_types":["bin"],"kind":["bin"],"name":"byte_json","src_path":"/home/ubuntu/byte_json/src/main.rs"}}
{"features":[],"filenames":["/home/ubuntu/byte_json/target/debug/byte_json"],"fresh":false,"package_id":"byte_json 0.1.0 (path+file:///home/ubuntu/byte_json)","profile":{"debug_assertions":true,"debuginfo":2,"opt_level":"0","overflow_checks":true,"test":false},"reason":"compiler-artifact","target":{"crate_types":["bin"],"kind":["bin"],"name":"byte_json","src_path":"/home/ubuntu/byte_json/src/main.rs"}}
Finished dev [unoptimized + debuginfo] target(s) in 2.59 secs
Running `target/debug/byte_json`
Hello, world!
```
Resolves#35164.
r? @jonathandturner
The `hi` and `lo` offsets in a span are relative to a `CodeMap`, but this
doesn't seem to be terribly useful for tool consumers who don't have the
codemap, but might want the byte offset within an actual file?
Resolves#35164.
[LLVM] Fix an assertion when a weak symbol is defined in global_asm.
This change will fix the issue from
https://github.com/japaric/svd2rust/pull/130
cc @japaric
r? @alexcrichton
Fix in weak_count in Arc in the case the weak count is locked.
In the case the weak count was locked, the weak_count function could
return usize::MAX. We need to test this condition manually.
trans: Internalize symbols without relying on LLVM
This PR makes the compiler use the information gather by the trans collector in order to determine which symbols/trans-items can be made internal. This has the advantages:
+ of being LLVM independent,
+ of also working in incremental mode, and
+ of allowing to not keep all LLVM modules in memory at the same time.
This is in preparation for fixing issue #39280.
cc @rust-lang/compiler
