Make load path cache work on truffleruby

Author: rwstauner

.github/workflows/ci.yaml

@@ -43,7 +43,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu]
-        ruby: ['2.6', '2.7', '3.0', '3.1', '3.2', 'ruby-head', 'debug', 'truffleruby']
+        ruby: ['2.6', '2.7', '3.0', '3.1', '3.2', 'ruby-head', 'debug', 'truffleruby', 'truffleruby-head']
     runs-on: ${{ matrix.os }}-latest
     steps:
       - uses: actions/checkout@v2

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Unreleased
 
 * Support YAML and JSON CompileCache on TruffleRuby.
+* Support LoadPathCache on TruffleRuby.
 
 # 1.16.0
 

lib/bootsnap/load_path_cache.rb

@@ -54,8 +54,17 @@ def unload!
       end
 
       def supported?
-        RUBY_ENGINE == "ruby" &&
-          RUBY_PLATFORM =~ /darwin|linux|bsd|mswin|mingw|cygwin/
+        case RUBY_ENGINE
+        when "truffleruby"
+          # https://github.com/oracle/truffleruby/issues/3131
+          return false if RUBY_ENGINE_VERSION < "23.1.0"
+        when "ruby"
+          # fall through
+        else
+          return false
+        end
+
+        RUBY_PLATFORM.match?(/darwin|linux|bsd|mswin|mingw|cygwin/)
       end
     end
   end

lib/bootsnap/load_path_cache/cache.rb

@@ -24,8 +24,16 @@ def load_dir(dir)
         @mutex.synchronize { @dirs[dir] }
       end
 
+      TRUFFLERUBY_LIB_DIR_PREFIX = if RUBY_ENGINE == "truffleruby"
+        "#{File.join(RbConfig::CONFIG['libdir'], 'truffle')}#{File::SEPARATOR}"
+      end
+
       # { 'enumerator' => nil, 'enumerator.so' => nil, ... }
       BUILTIN_FEATURES = $LOADED_FEATURES.each_with_object({}) do |feat, features|
+        if TRUFFLERUBY_LIB_DIR_PREFIX && feat.start_with?(TRUFFLERUBY_LIB_DIR_PREFIX)
+          feat = feat.byteslice(TRUFFLERUBY_LIB_DIR_PREFIX.bytesize..-1)
+        end
+
         # Builtin features are of the form 'enumerator.so'.
         # All others include paths.
         next unless feat.size < 20 && !feat.include?("/")

test/integration/kernel_test.rb

@@ -8,6 +8,8 @@ class KernelTest < Minitest::Test
     include TmpdirHelper
 
     def test_require_symlinked_file_twice
+      skip("https://github.com/oracle/truffleruby/issues/3138") if truffleruby?
+
       setup_symlinked_files
       if RUBY_VERSION >= "3.1"
         # Fixed in https://github.com/ruby/ruby/commit/79a4484a072e9769b603e7b4fbdb15b1d7eccb15 (Ruby 3.1)
@@ -41,6 +43,8 @@ def test_require_symlinked_file_twice_aliased
     end
 
     def test_require_relative_symlinked_file_twice
+      skip("https://github.com/oracle/truffleruby/issues/3138") if truffleruby?
+
       setup_symlinked_files
       if RUBY_VERSION >= "3.1"
         # Fixed in https://github.com/ruby/ruby/commit/79a4484a072e9769b603e7b4fbdb15b1d7eccb15 (Ruby 3.1)
@@ -83,6 +87,8 @@ def test_require_relative_and_then_require_symlinked_file
     end
 
     def test_require_deep_symlinked_file_twice
+      skip("https://github.com/oracle/truffleruby/issues/3138") if truffleruby?
+
       setup_symlinked_files
       if RUBY_VERSION >= "3.1"
         # Fixed in https://github.com/ruby/ruby/commit/79a4484a072e9769b603e7b4fbdb15b1d7eccb15 (Ruby 3.1)
@@ -116,6 +122,8 @@ def test_require_deep_symlinked_file_twice_aliased
     end
 
     def test_require_relative_deep_symlinked_file_twice
+      skip("https://github.com/oracle/truffleruby/issues/3138") if truffleruby?
+
       setup_symlinked_files
       if RUBY_VERSION >= "3.1"
         # Fixed in https://github.com/ruby/ruby/commit/79a4484a072e9769b603e7b4fbdb15b1d7eccb15 (Ruby 3.1)
@@ -211,5 +219,9 @@ def setup_symlinked_files
       RUBY
       File.symlink("real", "symlink")
     end
+
+    def truffleruby?
+      RUBY_ENGINE == "truffleruby"
+    end
   end
 end

test/load_path_cache/cache_test.rb

@@ -35,16 +35,21 @@ def test_builtin_features
         assert_equal false, cache.find("thread")
         assert_equal false, cache.find("thread.rb")
         assert_equal false, cache.find("enumerator")
-        assert_equal false, cache.find("enumerator.so")
 
-        if RUBY_PLATFORM =~ /darwin/
-          assert_equal false, cache.find("enumerator.bundle")
+        if truffleruby?
+          assert_equal false, cache.find("enumerator.rb")
         else
-          assert_same FALLBACK_SCAN, cache.find("enumerator.bundle")
+          assert_equal false, cache.find("enumerator.so")
+          if RUBY_PLATFORM =~ /darwin/
+            assert_equal false, cache.find("enumerator.bundle")
+          else
+            assert_same FALLBACK_SCAN, cache.find("enumerator.bundle")
+          end
         end
 
         bundle = RUBY_PLATFORM =~ /darwin/ ? "bundle" : "so"
 
+        # These are not present in TruffleRuby but that means they will still return falsey.
         refute(cache.find("thread.#{bundle}"))
         refute(cache.find("enumerator.rb"))
         refute(cache.find("encdb.#{bundle}"))
@@ -165,9 +170,15 @@ def test_path_encoding
           require path
           internal_path = $LOADED_FEATURES.last
           assert_equal(OS_ASCII_PATH_ENCODING, internal_path.encoding)
-          assert_equal(OS_ASCII_PATH_ENCODING, path.encoding)
+          # TruffleRuby object is a copy and the encoding resets to utf-8.
+          assert_equal(OS_ASCII_PATH_ENCODING, path.encoding) unless truffleruby?
           File.write(path, "")
-          assert_same path, internal_path
+
+          if truffleruby?
+            assert_equal path, internal_path
+          else
+            assert_same path, internal_path
+          end
 
           utf8_path = cache.find("béé")
           assert_equal("#{@dir1}/béé.rb", utf8_path)
@@ -176,9 +187,20 @@ def test_path_encoding
           assert_equal(Encoding::UTF_8, internal_utf8_path.encoding)
           assert_equal(Encoding::UTF_8, utf8_path.encoding)
           File.write(utf8_path, "")
-          assert_same utf8_path, internal_utf8_path
+
+          if truffleruby?
+            assert_equal utf8_path, internal_utf8_path
+          else
+            assert_same utf8_path, internal_utf8_path
+          end
         end
       end
+
+      private
+
+      def truffleruby?
+        RUBY_ENGINE == "truffleruby"
+      end
     end
   end
 end