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bors 4af28c98fa auto merge of #12296 : dotdash/rust/byval_noalias, r=cmr 
Function parameters that are to be passed by value but don't fit into a
single register are currently passed by creating a copy on the stack and
passing a pointer to that copy to the callee. Since the copy is made
just for the function call, there are no aliases.

For example, this sometimes allows LLVM to eliminate unnecessary calls
to drop glue. Given

````rust
struct Foo {
    a: int,
    b: Option<~str>,
}

extern {
    fn eat(eat: Option<~str>);
}

pub fn foo(v: Foo) {
    match v {
        Foo { a: _, b } => unsafe { eat(b) }
    }
}
````

LLVM currently can't eliminate the drop call for the string, because it
only sees a _pointer_ to Foo, for which it has to expect an alias. So we
get:

````llvm
; Function Attrs: uwtable
define void @_ZN3foo20h9f32c90ae7201edbxaa4v0.0E(%struct.Foo* nocapture) unnamed_addr #0 {
"_ZN34std..option..Option$LT$$UP$str$GT$9glue_drop17hc39b3015f3b9c69dE.exit":
  %1 = getelementptr inbounds %struct.Foo* %0, i64 0, i32 1, i32 0
  %2 = load { i64, i64, [0 x i8] }** %1, align 8
  store { i64, i64, [0 x i8] }* null, { i64, i64, [0 x i8] }** %1, align 8
  %3 = ptrtoint { i64, i64, [0 x i8] }* %2 to i64
  %.fca.0.insert = insertvalue { i64 } undef, i64 %3, 0
  tail call void @eat({ i64 } %.fca.0.insert)
  %4 = load { i64, i64, [0 x i8] }** %1, align 8
  %5 = icmp eq { i64, i64, [0 x i8] }* %4, null
  br i1 %5, label %_ZN3Foo9glue_drop17hf611996539d3036fE.exit, label %"_ZN8_$UP$str9glue_drop17h15dbdbe2b8897a98E.exit.i.i"

"_ZN8_$UP$str9glue_drop17h15dbdbe2b8897a98E.exit.i.i": ; preds = %"_ZN34std..option..Option$LT$$UP$str$GT$9glue_drop17hc39b3015f3b9c69dE.exit"
  %6 = bitcast { i64, i64, [0 x i8] }* %4 to i8*
  tail call void @free(i8* %6) #1
  br label %_ZN3Foo9glue_drop17hf611996539d3036fE.exit

_ZN3Foo9glue_drop17hf611996539d3036fE.exit:       ; preds = %"_ZN34std..option..Option$LT$$UP$str$GT$9glue_drop17hc39b3015f3b9c69dE.exit", %"_ZN8_$UP$str9glue_drop17h15dbdbe2b8897a98E.exit.i.i"
  ret void
}
````

But with the `noalias` attribute, it can safely optimize that to:

````llvm
define void @_ZN3foo20hd28431f929f0d6c4xaa4v0.0E(%struct.Foo* noalias nocapture) unnamed_addr #0 {
_ZN3Foo9glue_drop17he9afbc09d4e9c851E.exit:
  %1 = getelementptr inbounds %struct.Foo* %0, i64 0, i32 1, i32 0
  %2 = load { i64, i64, [0 x i8] }** %1, align 8
  store { i64, i64, [0 x i8] }* null, { i64, i64, [0 x i8] }** %1, align 8
  %3 = ptrtoint { i64, i64, [0 x i8] }* %2 to i64
  %.fca.0.insert = insertvalue { i64 } undef, i64 %3, 0
  tail call void @eat({ i64 } %.fca.0.insert)
  ret void
}
````
2014-02-15 12:46:23 -08:00
man Consolidate codegen-related compiler flags 2014-02-10 00:50:39 -08:00
mk mk: Address review feedback 2014-02-14 19:17:50 -08:00
src auto merge of #12296 : dotdash/rust/byval_noalias, r=cmr 2014-02-15 12:46:23 -08:00
.gitattributes drop the linenoise library 2013-10-16 22:57:51 -04:00
.gitignore doc: add license information for gen. files 2014-02-07 20:50:15 +01:00
.gitmodules Build compiler-rt and link it to all crates, similarly to morestack. 2014-02-11 15:59:59 -08:00
.mailmap .mailmap: tolerate different names, emails in shortlog 2013-06-05 23:26:00 +05:30
AUTHORS.txt Update extract-tests.py to use same test directives as rustdoc. 2014-01-28 14:52:36 -06:00
configure mk: Address review feedback 2014-02-14 19:17:50 -08:00
CONTRIBUTING.md Various READMEs and docs cleanup 2014-01-11 19:41:31 +01:00
COPYRIGHT Update some copyright dates 2014-01-08 18:04:43 -08:00
LICENSE-APACHE Update license, add license boilerplate to most files. Remainder will follow. 2012-12-03 17:12:14 -08:00
LICENSE-MIT Update some copyright dates 2014-01-08 18:04:43 -08:00
Makefile.in mk: Address review feedback 2014-02-14 19:17:50 -08:00
README.md Remove rustpkg. 2014-02-02 03:08:56 -05:00
RELEASES.txt More 0.9 release notes 2014-01-06 14:52:16 -08:00

README.md

The Rust Programming Language

This is a compiler for Rust, including standard libraries, tools and documentation.

Quick Start

Windows

  1. Download and use the installer and MinGW.
  2. Read the tutorial.
  3. Enjoy!

Note: Windows users can read the detailed getting started notes on the wiki.

Linux / OS X

  1. Make sure you have installed the dependencies:

    • g++ 4.4 or clang++ 3.x
    • python 2.6 or later (but not 3.x)
    • perl 5.0 or later
    • GNU make 3.81 or later
    • curl

  2. Download and build Rust:

    You can either download a tarball or build directly from the repo.

    To build from the tarball do:

     $ curl -O http://static.rust-lang.org/dist/rust-0.9.tar.gz
 $ tar -xzf rust-0.9.tar.gz
 $ cd rust-0.9

    Or to build from the repo do:

     $ git clone https://github.com/mozilla/rust.git
 $ cd rust

    Now that you have Rust's source code, you can configure and build it:

     $ ./configure
 $ make && make install

    Note: You may need to use sudo make install if you do not normally have permission to modify the destination directory. The install locations can be adjusted by passing a --prefix argument to configure. Various other options are also supported, pass --help for more information on them.

    When complete, make install will place several programs into /usr/local/bin: rustc, the Rust compiler, and rustdoc, the API-documentation tool. system.

  3. Read the tutorial.

  4. Enjoy!

Notes

Since the Rust compiler is written in Rust, it must be built by a precompiled "snapshot" version of itself (made in an earlier state of development). As such, source builds require a connection to the Internet, to fetch snapshots, and an OS that can execute the available snapshot binaries.

Snapshot binaries are currently built and tested on several platforms:

  • Windows (7, 8, Server 2008 R2), x86 only
  • Linux (2.6.18 or later, various distributions), x86 and x86-64
  • OSX 10.7 (Lion) or greater, x86 and x86-64

You may find that other platforms work, but these are our officially supported build environments that are most likely to work.

Rust currently needs about 1.5 GiB of RAM to build without swapping; if it hits swap, it will take a very long time to build.

There is a lot more documentation in the wiki.

License

Rust is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0), with portions covered by various BSD-like licenses.

See LICENSE-APACHE, LICENSE-MIT, and COPYRIGHT for details.