This was inspired by seeing a LLVM flatline of **~600MB** when running rustc with jemalloc (each type's `t_box_` is allocated on the heap, creating a lot of fragmentation, which jemalloc can deal with, unlike glibc).
By default, 32-bit Windows executables are restricted to 2GiB of address
space even when running on 64-bit Windows when 4GiB is available.
Closes#17043
A match in callee.rs was recognizing some foreign fns as named tuple constructors. A reproducible test case for this is nearly impossible since it depends on the way NodeIds happen to be assigned in different crates.
Fixes#15913
Closes#16813
r? @nikomatsakis I feel like I should be checking more things in check_rvalues, but not sure what - I don't properly understand expr_use_visitor
This assert was likely inherited from some point, but it's not quite valid as a
no-timeout read may enter this loop, but data could be stolen by any other read
after the socket is deemed readable.
I saw this fail in a recent bors run where the assertion was tripped.
Sometimes (e.g. on Rust CI) the "expand description" text of the
collapse toggle was displayed by default, when a page is first
loaded (even though the description is expanded), because some
Content-Security-Policy settings disable inline CSS.
Setting it the style with the `.css` method allows the output to be used
in more places.
Issue can be reproduced by the following:
```
$ cat main.rs
fn main() {}
$ rustc -Z print-link-args -Lfoo -Lbar main.rs
```
Run the rustc command a few times and observe that the order of the '-L' 'foo' '-L' 'bar' options randomly changes.
Actually hit this issue in practice on Windows when specifying two -L directories to rustc, one with rust-sdl2 in it and one with the C SDL2.dll. Since Windows file systems aren't case-sensitive, gcc randomly attempted to link against the rust sdl2.dll instead of SDL2.dll if that -L directory happened to come first.
The randomness was due to addl_lib_search_paths being a HashSet. Changed it to a Vec instead which maintains the ordering.
Unsure how to test this though since it is random by nature; suggestions very welcome.
Its arguments were inverted.
For instance it displayed this message:
```
warning: this extern crate syntax is deprecated. Use: extern create "foobar" as foo;
```
Instead of:
```
warning: this extern crate syntax is deprecated. Use: extern create "foo" as foobar;
```
By default, 32-bit Windows executables are restricted to 2GiB of address
space even when running on 64-bit Windows when 4GiB is available.
Closes#17043
If you browse to, say, http://doc.rust-lang.org/libc/types/os/common/posix01/struct.timeval.html , you will see the "location" window showing `libc::types::os::common::posix01`. The first element points to a crate and others point modules. This patch adds the bold attribute to the first (ie. crate) element so that it stands out more.
This branch adds support for running LLVM optimization and codegen on different parts of a crate in parallel. Instead of translating the crate into a single LLVM compilation unit, `rustc` now distributes items in the crate among several compilation units, and spawns worker threads to optimize and codegen each compilation unit independently. This improves compile times on multicore machines, at the cost of worse performance in the compiled code. The intent is to speed up build times during development without sacrificing too much optimization.
On the machine I tested this on, `librustc` build time with `-O` went from 265 seconds (master branch, single-threaded) to 115s (this branch, with 4 threads), a speedup of 2.3x. For comparison, the build time without `-O` was 90s (single-threaded). Bootstrapping `rustc` using 4 threads gets a 1.6x speedup over the default settings (870s vs. 1380s), and building `librustc` with the resulting stage2 compiler takes 1.3x as long as the master branch (44s vs. 55s, single threaded, ignoring time spent in LLVM codegen).
The user-visible changes from this branch are two new codegen flags:
* `-C codegen-units=N`: Distribute items across `N` compilation units.
* `-C codegen-threads=N`: Spawn `N` worker threads for running optimization and codegen. (It is possible to set `codegen-threads` larger than `codegen-units`, but this is not very useful.)
Internal changes to the compiler are described in detail on the individual commit messages.
Note: The first commit on this branch is copied from #16359, which this branch depends on.
r? @nick29581
Sometimes (e.g. on Rust CI) the "expand description" text of the
collapse toggle was displayed by default, when a page is first
loaded (even though the description is expanded), because some
Content-Security-Policy settings disable inline CSS.
Setting it the style with the `.css` method allows the output to be used
in more places.
