negator / mozjs

Servo's SpiderMonkey fork

This repository contains Rust bindings for SpiderMonkey for use with Servo.

The bindings are to the raw SpiderMonkey API, higher-level bindings are in the rust-mozjs repository.

Building

Under Linux:

Install Clang (at least version 3.9) and autoconf v 2.13, for example in a Debian-based Linux:

sudo apt-get install clang-6.0 autoconf2.13

If you have more than one version of Clang installed, you can set the LIBCLANG_PATH environment variable, for example:

export LIBCLANG_PATH=/usr/lib/clang/4.0/lib

Under Windows:

1. Follow the directions at https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions/Windows_Prerequisites

2. Open up a shell configured to use Visual Studio. This could be the one included with Visual Studio (e.g. Visual Studio 2017 / X64 Native Tools Command Prompt for VS 2017) or a shell in which you have run

"c:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Auxiliary\Build\vcvars64.bat"

3. Set the MOZTOOLS_PATH environment variable to point to the tools from the Mozilla Build Package:

set MOZTOOLS_PATH=C:\mozilla-build\msys\bin;C:\mozilla-build\bin

4. Download and install Clang for Windows (64 bit) from https://releases.llvm.org/download.html and set the LIBCLANG_PATH environment variable to its lib directory:

set LIBCLANG_PATH=C:\Program Files\LLVM\lib

5. Set environment variables so the build script can find Python 2.7 and Autoconf 2.13:

set AUTOCONF=C:\mozilla-build\msys\local\bin\autoconf-2.13
set NATIVE_WIN32_PYTHON=C:\mozilla-build\python\python2.7.exe

You can now build and test the crate using cargo:

cargo build
cargo test
cargo build --features debugmozjs
cargo test --features debugmozjs

Upgrading

In order to upgrade to a new version of SpiderMonkey:

1. Find the mozilla-release commit for the desired version of SpiderMonkey, at https://treeherder.mozilla.org/#/jobs?repo=mozilla-release&filter-searchStr=spidermonkey%20pkg. You are looking for an SM(pkg) tagged with FIREFOX_RELEASE. Take a note of the commit number to the left (a hex number such as ac4fbb7aaca0).

2. Click on the SM(pkg) link, which will open a panel with details of the commit, including an artefact uploaded link, with a name of the form mozjs-version.tar.bz2. Download it and save it locally.

3. Look at the patches in etc/patches/*.patch, and remove any that no longer apply (with a bit of luck this will be all of them).

4. Run python3 ./etc/update.py path/to/tarball.

5. Update etc/COMMIT with the commit number.

6. Build and test the bindings as above, then submit a PR!