Implement LTO #10812
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Implement LTO #10812
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As a side effect, this also changes the printout of |
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cc @huonw I imagine your thingy just uses a regex / eats all whitespace? |
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It would use a regex, if we had them. :P And, no, it's does fixed width parsing, iirc; I'll adjust it. |
Right now whenever an rlib file is linked against, all of the metadata from the rlib is pulled in to the final staticlib or binary. The reason for this is that the metadata is currently stored in a section of the object file. Note that this is intentional for dynamic libraries in order to distribute metadata bundled with static libraries. This commit alters the situation for rlib libraries to instead store the metadata in a separate file in the archive. In doing so, when the archive is passed to the linker, none of the metadata will get pulled into the result executable. Furthermore, the metadata file is skipped when assembling rlibs into an archive. The snag in this implementation comes with multiple output formats. When generating a dylib, the metadata needs to be in the object file, but when generating an rlib this needs to be separate. In order to accomplish this, the metadata variable is inserted into an entirely separate LLVM Module which is then codegen'd into a different location (foo.metadata.o). This is then linked into dynamic libraries and silently ignored for rlib files. While changing how metadata is inserted into archives, I have also stopped compressing metadata when inserted into rlib files. We have wanted to stop compressing metadata, but the sections it creates in object file sections are apparently too large. Thankfully if it's just an arbitrary file it doesn't matter how large it is. I have seen massive reductions in executable sizes, as well as staticlib output sizes (to confirm that this is all working).
| let dst_str = dst.as_str().unwrap().to_owned(); | ||
| let mut archive = Archive::open(sess, dst); | ||
| archive.remove_file(format!("{}.o", name)); | ||
| args.push(dst_str); |
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Bit of a hack, but I'm OK with this.
This commit implements LTO for rust leveraging LLVM's passes. What this means
is:
* When compiling an rlib, in addition to insdering foo.o into the archive, also
insert foo.bc (the LLVM bytecode) of the optimized module.
* When the compiler detects the -Z lto option, it will attempt to perform LTO on
a staticlib or binary output. The compiler will emit an error if a dylib or
rlib output is being generated.
* The actual act of performing LTO is as follows:
1. Force all upstream libraries to have an rlib version available.
2. Load the bytecode of each upstream library from the rlib.
3. Link all this bytecode into the current LLVM module (just using llvm
apis)
4. Run an internalization pass which internalizes all symbols except those
found reachable for the local crate of compilation.
5. Run the LLVM LTO pass manager over this entire module
6a. If assembling an archive, then add all upstream rlibs into the output
archive. This ignores all of the object/bitcode/metadata files rust
generated and placed inside the rlibs.
6b. If linking a binary, create copies of all upstream rlibs, remove the
rust-generated object-file, and then link everything as usual.
As I have explained in rust-lang#10741, this process is excruciatingly slow, so this is
*not* turned on by default, and it is also why I have decided to hide it behind
a -Z flag for now. The good news is that the binary sizes are about as small as
they can be as a result of LTO, so it's definitely working.
Closes rust-lang#10741
Closes rust-lang#10740
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The first commit was approved from another pull request, but I wanted to rebase LTO on top of it. LTO is not turned on by default at all, and it's hidden behind a `-Z` flag. I have added a few small tests for it, however.
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The first commit was approved from another pull request, but I wanted to rebase LTO on top of it.
LTO is not turned on by default at all, and it's hidden behind a
-Zflag. I have added a few small tests for it, however.