Rollup of 10 pull requests #54051
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Rollup of 10 pull requests #54051
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It now does one hash table lookup per basic block, instead of one per statement. This is worthwhile because this function is hot for NLL builds of `ucd`.
in order to avoid constantly zeroing memory when it's not needed.
…crates` fixes the *first* false positive reported in rust-lang#53964
We're shipping a rust-enabled lldb, but the "lldb" executable is not installed into the "bin" directory by rustup. See the discussion in rust-lang/rustup#1492 for background on this decision. There, we agreed to have rust-lldb prefer the rust-enabled lldb if it is installed. This patch changes dist.rs to put lldb into rustlib, following what was done for the other LLVM tools in rust-lang#53955, and then fixes rust-lldb to prefer that lldb, if it exists. See issue rust-lang#48168
Signed-off-by: Marc-Antoine Perennou <[email protected]>
Also, adjust the MAX to be `u32::MAX - 1`, leaving room for `u32::MAX` to become a sentinel value in the future.
This reverts (part of) commit cb9a336ae2cf6a75fdcc130853286349cb424c96.
This fixes building `bootstrap` using a local Rust nightly.
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@bors r+ p=11 |
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📌 Commit 46b5282 has been approved by |
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Rollup of 11 pull requests Successful merges: - #51366 (stabilize #[panic_handler]) - #53162 (rustdoc: collect trait impls as an early pass) - #53932 ([NLL] Remove base_place) - #53942 (Rewrite `precompute_borrows_out_of_scope` for fewer hash table lookups.) - #53973 (Have rust-lldb look for the rust-enabled lldb) - #53981 (Implement initializer() for FileDesc) - #53987 (rustbuild: allow configuring llvm version suffix) - #53993 (rustc_resolve: don't record uniform_paths canaries as reexports.) - #54007 (crates that provide a `panic_handler` are exempt from the `unused_extern_crates` lint) - #54040 (update books for next release) - #54050 (Update `petgraph` dependency to 0.4.13 to fix build with nightly) Failed merges: r? @ghost
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@bors r- retry Intralink failure again 😡 |
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…ikomatsakis
[NLL] Remove base_place
This function was supposed to make `Box` less special. But
* I think that the consensus is that MIR borrowck is going to fully special case `Box`
* It wasn't implemented correctly, it's looking at the type of the wrong `Place`, resulting in weird behaviour:
```rust
#![feature(nll)]
type A = Box<i32>; // If this is changed to another type then this will compile.
pub fn foo(x: Box<(String, A)>) {
let a = x.0; // This will compile if these lines are swapped
let b = x.1;
}
```
r? @nikomatsakis
…komatsakis Rewrite `precompute_borrows_out_of_scope` for fewer hash table lookups. It now does one hash table lookup per basic block, instead of one per statement. This is worthwhile because this function is hot for NLL builds of `ucd`. I haven't measured the effect of this yet because I'm having trouble doing optimized builds of rustc that are suitable for profiling (rust-lang#53916). I will do an online perf run instead. r? @nikomatsakis
…alexcrichton Have rust-lldb look for the rust-enabled lldb We're shipping a rust-enabled lldb, but the "lldb" executable is not installed into the "bin" directory by rustup. See the discussion in rust-lang/rustup#1492 for background on this decision. There, we agreed to have rust-lldb prefer the rust-enabled lldb if it is installed. This patch changes rust-lldb to look in the sysroot and use the lldb found there, if any. See issue rust-lang#48168
Implement initializer() for FileDesc
Here was my initial issue:
```rust
use std::process::{Command};
fn main() {
let output = Command::new("curl").arg("-s").arg("http://ovh.net/files/100Mio.dat").output();
println!("{:?}", output.unwrap().stdout.len());
}
```
```
~/stuff ❯❯❯ time ./dwl
104857600
./dwl 16.22s user 1.80s system 23% cpu 1:15.24 total
```
```rust
use std::process::{Command, Stdio};
fn main() {
let child = Command::new("curl").arg("-s").arg("http://ovh.net/files/100Mio.dat").stdout(Stdio::piped()).spawn();
let output = child.unwrap().wait_with_output().unwrap();
println!("{:?}", output.stdout.len());
}
```
```
~/stuff ❯❯❯ time ./dwl2
104857600
./dwl2 0.64s user 2.18s system 5% cpu 53.072 total
```
As you can see the first version is spending much more time in userland and also uses more cpu. With the help of @programble, @talchas and @habnabit on the rust IRC, we discovered that the slow version uses two pipes, one for `stdin` and one for `stderr` and in that case it polls when going through [this function](https://github.com/rust-lang/rust/blob/master/src/libstd/sys/unix/pipe.rs#L82). The polling calls `read_to_end` on the pipes repetitively and this results in zeroing its internal buffer each time. To avoid this zeroing, `FileDesc` needs to implement `initializer`. We see no reason why it [wouldn't work with uninitialized memory](https://doc.rust-lang.org/1.26.1/src/std/io/mod.rs.html#534) so this PR fixes that.
Here is some tracing of the slow program:
versus the fast program:
I have not tested the change yet but will try to build it tomorrow.
rustbuild: allow configuring llvm version suffix Fixes rust-lang#53852 by allowing user to install different versions of rust to the same sysroot.
rustc_resolve: don't record uniform_paths canaries as reexports. Fixes rust-lang#53691, fixes rust-lang#53484.
crates that provide a `panic_handler` are exempt from the `unused_extern_crates` lint fixes the *first* false positive reported in rust-lang#53964
…imulacrum update books for next release
…y, r=alexcrichton Update `petgraph` dependency to 0.4.13 to fix build with nightly I wanted to build Rust from source using a local nightly compiler, but I was unable to get `bootstrap` to compile due to a naming conflict with the `find_map` function. This PR updates the `petgraph` dependency of `bootstrap` to 0.4.13, fixing the issue.
…Simulacrum use `NonZeroU32` in `newtype_index!`macro, change syntax Various improvements to the `newtype_index!` macro: - Use `NonZeroU32` so that `Option<T>` is cheap - More ergonomic helper method, no need to import `Idx` trait all the time - Improve syntax to use `struct` keyword so that ripgrep works to find type def'n Fixes rust-lang#50337 I'm curious to see if this passes tests =)
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📌 Commit 51c3879 has been approved by |
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Rollup of 10 pull requests Successful merges: - #53315 (use `NonZeroU32` in `newtype_index!`macro, change syntax) - #53932 ([NLL] Remove base_place) - #53942 (Rewrite `precompute_borrows_out_of_scope` for fewer hash table lookups.) - #53973 (Have rust-lldb look for the rust-enabled lldb) - #53981 (Implement initializer() for FileDesc) - #53987 (rustbuild: allow configuring llvm version suffix) - #53993 (rustc_resolve: don't record uniform_paths canaries as reexports.) - #54007 (crates that provide a `panic_handler` are exempt from the `unused_extern_crates` lint) - #54040 (update books for next release) - #54050 (Update `petgraph` dependency to 0.4.13 to fix build with nightly)
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☀️ Test successful - status-appveyor, status-travis |
This was referenced Sep 8, 2018
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Successful merges:
NonZeroU32innewtype_index!macro, change syntax #53315 (useNonZeroU32innewtype_index!macro, change syntax)precompute_borrows_out_of_scopefor fewer hash table lookups. #53942 (Rewriteprecompute_borrows_out_of_scopefor fewer hash table lookups.)panic_handlerare exempt from theunused_extern_crateslint #54007 (crates that provide apanic_handlerare exempt from theunused_extern_crateslint)petgraphdependency to 0.4.13 to fix build with nightly #54050 (Updatepetgraphdependency to 0.4.13 to fix build with nightly)