Initial implementation of regalloc2.

.github/workflows/rust.yml

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+# Derived from regalloc.rs' GitHub CI config file.
+
+name: Rust
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  # Lint code with rustfmt, report an error if it needs to be run.
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install rustfmt
+      run: rustup component add rustfmt
+    - name: Run rustfmt and check there's no difference
+      run: cargo fmt --all -- --check
+
+  # Make sure the code compiles and that all the tests pass.
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build
+      run: cargo build
+    - name: Run tests
+      run: cargo test --all --verbose
+
+  # Lint dependency graph for security advisories, duplicate versions, and
+  # incompatible licences.
+  cargo_deny:
+    name: Cargo deny
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        submodules: true
+    - run: |
+        set -e
+        curl -L https://github.com/EmbarkStudios/cargo-deny/releases/download/0.8.5/cargo-deny-0.8.5-x86_64-unknown-linux-musl.tar.gz | tar xzf -
+        mv cargo-deny-*-x86_64-unknown-linux-musl/cargo-deny cargo-deny
+        echo `pwd` >> $GITHUB_PATH
+    - run: cargo deny check
+
+  # Builds the fuzz targets.
+  fuzz:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install nightly
+      run: rustup toolchain install nightly
+    - name: Install cargo-fuzz
+      run: cargo +nightly install cargo-fuzz
+    - name: Build ssagen fuzzing target
+      run: cargo +nightly fuzz build ssagen
+    - name: Build moves fuzzing target
+      run: cargo +nightly fuzz build moves
+    - name: Build ion fuzzing target
+      run: cargo +nightly fuzz build ion
+    - name: Build and smoke-test ion_checker fuzzing target
+      run: cargo +nightly fuzz run ion_checker ./fuzz/smoketest/ion_checker.bin

.gitignore

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+Cargo.lock
+target/
+.*.swp
+*~

Cargo.toml

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+[package]
+name = "regalloc2"
+version = "0.0.1"
+authors = ["Chris Fallin <[email protected]>", "Mozilla SpiderMonkey Developers"]
+edition = "2018"
+license = "Apache-2.0 WITH LLVM-exception AND MPL-2.0"
+description = "Backtracking register allocator inspired from IonMonkey"
+repository = "https://github.com/bytecodealliance/regalloc2"
+
+[dependencies]
+log = { version = "0.4.8", default-features = false }
+smallvec = "1.6.1"
+fxhash = "0.2.1"
+
+# The below are only needed for fuzzing.
+# Keep this in sync with libfuzzer_sys's crate version:
+arbitrary = { version = "^0.4.6", optional = true }
+
+[profile.release]
+debug = true
+
+[features]
+default = []
+fuzzing = ["arbitrary"]

LICENSE

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README.md

@@ -0,0 +1,33 @@
+## regalloc2: another register allocator
+
+This is a register allocator that started life as, and is about 50%
+still, a port of IonMonkey's backtracking register allocator to
+Rust. In many regards, it has been generalized, optimized, and
+improved since the initial port, and now supports both SSA and non-SSA
+use-cases.
+
+In addition, it contains substantial amounts of testing infrastructure
+(fuzzing harnesses and checkers) that does not exist in the original
+IonMonkey allocator.
+
+See the [design overview](doc/DESIGN.md) for (much!) more detail on
+how the allocator works.
+
+## License
+
+Unless otherwise specified, code in this crate is licensed under the Apache 2.0
+License with LLVM Exception. This license text can be found in the file
+`LICENSE`.
+
+Files in the `src/ion/` directory are directly ported from original C++ code in
+IonMonkey, a part of the Firefox codebase. Parts of `src/lib.rs` are also
+definitions that are directly translated from this original code. As a result,
+these files are derivative works and are covered by the Mozilla Public License
+(MPL) 2.0, as described in license headers in those files. Please see the
+notices in relevant files for links to the original IonMonkey source files from
+which they have been translated/derived. The MPL text can be found in
+`src/ion/LICENSE`.
+
+Parts of the code are derived from regalloc.rs: in particular,
+`src/checker.rs` and `src/domtree.rs`. This crate has the same license
+as regalloc.rs, so the license on these files does not differ.