FEATURE: Implement MiniRacer for TruffleRuby (#253)

.github/workflows/ci.yml

@@ -3,6 +3,26 @@ on:
   - push
 
 jobs:
+  test-truffleruby:
+    name: Test TruffleRuby
+    runs-on: ubuntu-20.04
+    env:
+      TRUFFLERUBYOPT: "--jvm --polyglot"
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: truffleruby+graalvm-head
+      - name: Install GraalVM js component
+        run: if ! gu list | grep '^js '; then gu install js; fi
+      - name: Bundle
+        run: bundle install
+      - name: Compile
+        run: bundle exec rake compile
+      - name: Test
+        run: bundle exec rake test
   test-darwin:
     strategy:
       fail-fast: false

Rakefile

@@ -1,6 +1,5 @@
 require "bundler/gem_tasks"
 require "rake/testtask"
-require "rake/extensiontask"
 
 Rake::TestTask.new(:test) do |t|
   t.libs << "test"
@@ -11,8 +10,21 @@ end
 task :default => [:compile, :test]
 
 gem = Gem::Specification.load( File.dirname(__FILE__) + '/mini_racer.gemspec' )
-Rake::ExtensionTask.new( 'mini_racer_loader', gem )
-Rake::ExtensionTask.new( 'mini_racer_extension', gem )
+
+if RUBY_ENGINE == "truffleruby"
+  task :compile do
+    # noop
+  end
+
+  task :clean do
+    # noop
+  end
+else
+  require 'rake/extensiontask'
+  Rake::ExtensionTask.new( 'mini_racer_loader', gem )
+  Rake::ExtensionTask.new( 'mini_racer_extension', gem )
+end
+
 
 
 # via http://blog.flavorjon.es/2009/06/easily-valgrind-gdb-your-ruby-c.html

ext/mini_racer_extension/extconf.rb

@@ -1,4 +1,10 @@
 require 'mkmf'
+
+if RUBY_ENGINE == "truffleruby"
+  File.write("Makefile", dummy_makefile($srcdir).join(""))
+  return
+end
+
 require_relative '../../lib/mini_racer/version'
 gem 'libv8-node', MiniRacer::LIBV8_NODE_VERSION
 require 'libv8-node'

ext/mini_racer_loader/extconf.rb

@@ -1,5 +1,10 @@
 require 'mkmf'
 
+if RUBY_ENGINE == "truffleruby"
+  File.write("Makefile", dummy_makefile($srcdir).join(""))
+  return
+end
+
 extension_name = 'mini_racer_loader'
 dir_config extension_name
 

lib/mini_racer.rb

@@ -1,14 +1,18 @@
 require "mini_racer/version"
-require "mini_racer_loader"
 require "pathname"
 
-ext_filename = "mini_racer_extension.#{RbConfig::CONFIG['DLEXT']}"
-ext_path = Gem.loaded_specs['mini_racer'].require_paths
-  .map { |p| (p = Pathname.new(p)).absolute? ? p : Pathname.new(__dir__).parent + p }
-ext_found = ext_path.map { |p| p + ext_filename }.find { |p| p.file? }
-
-raise LoadError, "Could not find #{ext_filename} in #{ext_path.map(&:to_s)}" unless ext_found
-MiniRacer::Loader.load(ext_found.to_s)
+if RUBY_ENGINE == "truffleruby"
+  require "mini_racer/truffleruby"
+else
+  require "mini_racer_loader" 
+  ext_filename = "mini_racer_extension.#{RbConfig::CONFIG['DLEXT']}"
+  ext_path = Gem.loaded_specs['mini_racer'].require_paths
+    .map { |p| (p = Pathname.new(p)).absolute? ? p : Pathname.new(__dir__).parent + p }
+  ext_found = ext_path.map { |p| p + ext_filename }.find { |p| p.file? }
+
+  raise LoadError, "Could not find #{ext_filename} in #{ext_path.map(&:to_s)}" unless ext_found
+  MiniRacer::Loader.load(ext_found.to_s)
+end
 
 require "thread"
 require "json"