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Also reorder changes to put the important one first.
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Rollup of 9 pull requests
- Successful merges: #44962, #45051, #45091, #45106, #45117, #45118, #45120, #45125, #45136
- Failed merges:
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Clarify RAM usage during build in README
The sentence wasn't immediately clear if it meant RAM or disk space before reading the next sentence.
I think this helps clarify it.
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Update grammar to parse current rust syntax
Mainly addressing #32723. This PR updates the bison grammar so that it can parse the current rust syntax, except for feature-gated syntax additions. It has been tested with all the tests in run-pass.
The grammar in this repo doesn't have build logic anymore, but you can test it out in https://github.com/bleibig/rust-grammar, which has all of what's in this PR. If you are interested in having build logic and grammar tests again, I can look into implementing that as well.
I'm aware that things are somewhat undecided as to what an official rust grammar should be from the discussion in #30942. With this PR we can go back to having an up-to-date flex/bison based grammar, but the rustypop grammar looks interesting as well.
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Use identity operator `is` when comparing to None
This is very minor, but idiomatic Python code uses `is` for comparisons to `None`. This is because semantically we want to compare to the "identity" of `None`, not its value.
See [PEP8 for details](https://www.python.org/dev/peps/pep-0008/#programming-recommendations).
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Fix variable name reference
As best I can tell, this was a typo due to how similar it looks to the function above it. PyCharm found this as a unbound local variable.
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Fix raising a bare str as an exception in configure.py
Raising a bare `str` has been [deprecated since Python 2.5](https://docs.python.org/2/whatsnew/2.5.html#pep-352-exceptions-as-new-style-classes).
On Python 2.7 it produces the following error:
```
TypeError: exceptions must be old-style classes or derived from BaseException, not str
```
For maximum compatibility with Python 2.7 and 3.x, we wrap the error message in `RuntimeError` which derives from `Exception`.
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since Python 2.5
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Add links and examples for std::process::Stdio
As per #29370
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Also remove trailing whitespace to pass tidy checks.
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As per #29370
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debuginfo-test: Fix #45086.
Fixes #45086, where all debuginfo-lldb fails when using LLDB from Xcode 9.
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LLDB's output may be None instead of '', and that will cause type
mismatch when normalize_whitespace() expects a string instead of
None. This commit simply ensures we do pass '' even if the output
is None.
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Debugger pretty printer files are take into account in test execution time-stamping
This PR is proposed to solve the issue #45022.
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Add pretty printer files into test execution time-stamping
Move find_rust_src_path() as a method for Config
Move find_rust_src_path() as a method for Config
Call find_rust_src_path() from Config
Move find_rust_src_path() from common.rs to header.rs
Add pretty printer files as relevant files to get up_to_date information
Remove dead code
Add two pretty printer files to keep a close watch on
Move find_rust_src_path() as a method for Config
Move find_rust_src_path() as a method for Config
Call find_rust_src_path() from Config
Move find_rust_src_path() from common.rs to header.rs
Remove dead code
Add two pretty printer files to keep a close watch on
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Don't encourage people to ignore threading errors in the docs
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Migrate to eprint/eprintln macros where appropriate.
None
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Don't panic in the coordinator thread, bubble up the failure
Fixes #43402 (take 2)
Followup to #45019, this makes the coordinator thread not panic on worker failures since they can be reported reasonably back in the main thread.
The output also now has no evidence of backtraces at all, unlike the previous PR:
```
$ ./build/x86_64-unknown-linux-gnu/stage1/bin/rustc -o "" x.rs
error: could not write output to : No such file or directory
error: aborting due to previous error
```
r? @alexcrichton
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Fixes #43402 (take 2)
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rustc: Don't inline in CGUs at -O0
This commit tweaks the behavior of inlining functions into multiple codegen
units when rustc is compiling in debug mode. Today rustc will unconditionally
treat `#[inline]` functions by translating them into all codegen units that
they're needed within, marking the linkage as `internal`. This commit changes
the behavior so that in debug mode (compiling at `-O0`) rustc will instead only
translate `#[inline]` functions into *one* codegen unit, forcing all other
codegen units to reference this one copy.
The goal here is to improve debug compile times by reducing the amount of
translation that happens on behalf of multiple codegen units. It was discovered
in #44941 that increasing the number of codegen units had the adverse side
effect of increasing the overal work done by the compiler, and the suspicion
here was that the compiler was inlining, translating, and codegen'ing more
functions with more codegen units (for example `String` would be basically
inlined into all codegen units if used). The strategy in this commit should
reduce the cost of `#[inline]` functions to being equivalent to one codegen
unit, which is only translating and codegen'ing inline functions once.
Collected [data] shows that this does indeed improve the situation from [before]
as the overall cpu-clock time increases at a much slower rate and when pinned to
one core rustc does not consume significantly more wall clock time than with one
codegen unit.
One caveat of this commit is that the symbol names for inlined functions that
are only translated once needed some slight tweaking. These inline functions
could be translated into multiple crates and we need to make sure the symbols
don't collideA so the crate name/disambiguator is mixed in to the symbol name
hash in these situations.
[data]: https://github.com/rust-lang/rust/issues/44941#issuecomment-334880911
[before]: https://github.com/rust-lang/rust/issues/44941#issuecomment-334583384
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This commit tweaks the behavior of inlining functions into multiple codegen
units when rustc is compiling in debug mode. Today rustc will unconditionally
treat `#[inline]` functions by translating them into all codegen units that
they're needed within, marking the linkage as `internal`. This commit changes
the behavior so that in debug mode (compiling at `-O0`) rustc will instead only
translate `#[inline]` functions into *one* codegen unit, forcing all other
codegen units to reference this one copy.
The goal here is to improve debug compile times by reducing the amount of
translation that happens on behalf of multiple codegen units. It was discovered
in #44941 that increasing the number of codegen units had the adverse side
effect of increasing the overal work done by the compiler, and the suspicion
here was that the compiler was inlining, translating, and codegen'ing more
functions with more codegen units (for example `String` would be basically
inlined into all codegen units if used). The strategy in this commit should
reduce the cost of `#[inline]` functions to being equivalent to one codegen
unit, which is only translating and codegen'ing inline functions once.
Collected [data] shows that this does indeed improve the situation from [before]
as the overall cpu-clock time increases at a much slower rate and when pinned to
one core rustc does not consume significantly more wall clock time than with one
codegen unit.
One caveat of this commit is that the symbol names for inlined functions that
are only translated once needed some slight tweaking. These inline functions
could be translated into multiple crates and we need to make sure the symbols
don't collideA so the crate name/disambiguator is mixed in to the symbol name
hash in these situations.
[data]: https://github.com/rust-lang/rust/issues/44941#issuecomment-334880911
[before]: https://github.com/rust-lang/rust/issues/44941#issuecomment-334583384
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rustc: Reduce default CGUs to 16
Rationale explained in the included comment as well as #44941
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Rationale explained in the included comment as well as #44941
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Remove support for the PNaCl target (le32-unknown-nacl)
This removes support for the `le32-unknown-nacl` target which is currently supported by rustc on tier 3. Despite the "nacl" in the name, the target doesn't output native code (x86, ARM, MIPS), instead it outputs binaries in the PNaCl format.
There are two reasons for the removal:
* Google [has announced](https://blog.chromium.org/2017/05/goodbye-pnacl-hello-webassembly.html) deprecation of the PNaCl format. The suggestion is to migrate to wasm. Happens we already have a wasm backend!
* Our PNaCl LLVM backend is provided by the fastcomp patch set that the LLVM fork used by rustc contains in addition to vanilla LLVM (`src/llvm/lib/Target/JSBackend/NaCl`). Upstream LLVM doesn't have PNaCl support. Removing PNaCl support will enable us to move away from fastcomp (#44006) and have a lighter set of patches on top of upstream LLVM inside our LLVM fork. This will help distribution packagers of Rust.
Fixes #42420
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rustc: Don't create empty codegen units
This'll end up just creating a bunch of object files that otherwise wouldn't
exist, so skip that extra work if possible.
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This'll end up just creating a bunch of object files that otherwise wouldn't
exist, so skip that extra work if possible.
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rustc_trans: do not set NoCapture for anonymous lifetime &T arguments.
This was both unsound (due to lifetime elision & unsafe code) and dead code (we erase lifetimes).
r? @nikomatsakis
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zircon: the type of zx_handle_t is now unsigned
This is a kernel ABI change that landed today. I noticed some other ABI
issues and have left a note to cleanup once they are better defined.
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* Use size_t where size_t is used, while it's not critical on our
specifically supported architectures, this is more accurate.
* Update HND_SPECIAL_COUNT to the correct value, and give it the size
that enum is likely to be.
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This is a kernel ABI change that landed today. I noticed some other ABI
issues and have left a note to cleanup once they are better defined.
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r=nikomatsakis
MIR-borrowck: gather and signal any move errors
When building up the `MoveData` structure for a given MIR, also accumulate any erroneous actions, and then report all of those errors when the construction is complete.
This PR adds a host of move-related error constructor methods to `trait BorrowckErrors`. I think I got the notes right; but we should plan to audit all of the notes before turning MIR-borrowck on by default.
Fix #44830
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This commit tests *just* the subset of the tests that were previously
ICE'ing and where now AST- and MIR-borrowck both match in terms of the
errors they report.
In other words: there remain *other* tests that previously ICE'd, and
now no longer ICE, but their remains a divergence between the errors
reported by AST-borrowck and by MIR-borrowck.
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Implicitly threaded `Location` through MoveData construction via a
`Gatherer` struct (so that we could look up the span corresponding to
the location when we need to signal an error).
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Currently is using DUMMY_SP as the associated span; a follow-up commit
will pass in appropriate spans when constructing the errors.
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mir-borrowck.
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mir-borrowck.
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mir-borrowck.
(Had to modify signature of `report_cannot_move_out_of` slightly to
satisfy requirements of newly added `fn cannot_move_out_of` method.)
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