Class: Ruby2Java::JavaCompiler

Inherits:
Object
  • Object
show all
Defined in:
lib/compiler.rb

Constant Summary collapse

RubyObject = 
org.jruby.RubyObject
RubyBasicObject = 
org.jruby.RubyBasicObject
Ruby = 
org.jruby.Ruby
RubyClass = 
org.jruby.RubyClass
IRubyObject = 
org.jruby.runtime.builtin.IRubyObject
ThreadContext = 
org.jruby.runtime.ThreadContext
LoadService = 
org.jruby.runtime.load.LoadService
JClass = 
java.lang.Class
JavaUtil = 
org.jruby.javasupport.JavaUtil
JObject = 
java.lang.Object

Instance Method Summary collapse

Constructor Details

#initialize(source_name) ⇒ JavaCompiler

Returns a new instance of JavaCompiler.



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# File 'lib/compiler.rb', line 19

def initialize(source_name)
  @file_builder = BiteScript::FileBuilder.new(source_name)
end

Instance Method Details

#create_method(cb, method_name, method, signatures = nil, annotations = nil, options = {}) ⇒ Object 



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# File 'lib/compiler.rb', line 102

def create_method(cb, method_name, method, signatures = nil, annotations = nil, options = {})
  java_signature = true

  unless signatures
    signatures = Signature.undefined_for_arity(method.arity)
    java_signature = false
  end

  for s in signatures do
    if options[:static]
      mb = cb.public_static_method method_name, s.retval, *(s.params)
    else
      mb = cb.public_method method_name, s.retval, *(s.params)
    end

    mb.start

    if annotations && annotations.size > 0
      # define annotations
      annotations.each do |anno_cls, anno_data|
        mb.annotate(anno_cls, true) do |anno|
          anno_data.each {|k,v| anno.send(k + "=", v)} if anno_data
        end
      end
    end

    # prepare receiver, context, and method name for callMethod later
    options[:static] ? mb.getstatic(mb.this, "__ruby_class__", RubyClass) : mb.aload(0)
    mb.dup
    mb.invokeinterface IRubyObject, "getRuntime", [Ruby]
    ruby_index = first_local(s.params, !options[:static])
    mb.dup; mb.astore ruby_index
    mb.invokevirtual Ruby, "getCurrentContext", [ThreadContext]
    mb.ldc method_name

    # TODO: arity-specific calling
    if java_signature
      java_args(mb, method, s.params, ruby_index, options)
    else
      ruby_args(mb, method, ruby_index, options)
    end

    # invoke the method dynamically
    # TODO: this could have a simple inline cache
    mb.invokevirtual RubyBasicObject, "callMethod", [IRubyObject, ThreadContext, mb.string, IRubyObject[]]

    # return the result
    if java_signature
      java_return(mb, s.retval)
    else
      ruby_return(mb, s.retval)
    end

    mb.stop
  end
end

#first_local(params, instance = true) ⇒ Object 



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# File 'lib/compiler.rb', line 159

def first_local(params, instance = true)
  i = instance ? 1 : 0
  params.each do |param|
    if param == Java::long || param == Java::double
      i += 2
    else
      i += 1
    end
  end
  i
end

#java_args(mb, method, params, ruby_index, options = {}) ⇒ Object 



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# File 'lib/compiler.rb', line 171

def java_args(mb, method, params, ruby_index, options = {})
  # We have a signature and need to use java integration logic
  mb.ldc params.size
  mb.anewarray IRubyObject
  base = options[:static] ? 0 : 1
  index = base
  0.upto(params.size - 1) do |i|
    mb.dup
    mb.ldc i 
    mb.aload ruby_index
    param_type = params[i - 1]
    if [mb.boolean, mb.byte, mb.short, mb.char, mb.int].include? param_type
      mb.iload index + base
      mb.invokestatic JavaUtil, "convertJavaToRuby", [IRubyObject, Ruby, mb.int]
    elsif mb.long == param_type
      mb.lload index + base
      mb.invokestatic JavaUtil, "convertJavaToRuby", [IRubyObject, Ruby, mb.long]
      index += 1
    elsif mb.float == param_type
      mb.fload index + base
      mb.invokestatic JavaUtil, "convertJavaToRuby", [IRubyObject, Ruby, mb.float]
    elsif mb.double == param_type
      mb.dload index + base
      mb.invokestatic JavaUtil, "convertJavaToRuby", [IRubyObject, Ruby, mb.double]
      index += 1
    else
      mb.aload index + base
      mb.invokestatic JavaUtil, "convertJavaToUsableRubyObject", [IRubyObject, Ruby, mb.object]
    end
    mb.aastore
    index += 1
  end
end

#java_return(mb, retval) ⇒ Object 



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# File 'lib/compiler.rb', line 228

def java_return(mb, retval)
  if mb.boolean == retval
    mb.invokestatic JavaUtil, "convertRubyToJavaBoolean", [mb.boolean, IRubyObject]
    mb.ireturn
  elsif mb.byte == retval
    mb.invokestatic JavaUtil, "convertRubyToJavaByte", [mb.byte, IRubyObject]
    mb.ireturn
  elsif mb.short == retval
    mb.invokestatic JavaUtil, "convertRubyToJavaShort", [mb.short, IRubyObject]
    mb.ireturn
  elsif mb.char == retval
    mb.invokestatic JavaUtil, "convertRubyToJavaChar", [mb.char, IRubyObject]
    mb.ireturn
  elsif mb.int == retval
    mb.invokestatic JavaUtil, "convertRubyToJavaInt", [mb.int, IRubyObject]
    mb.ireturn
  elsif mb.long == retval
    mb.invokestatic JavaUtil, "convertRubyToJavaLong", [mb.long, IRubyObject]
    mb.lreturn
  elsif mb.float == retval
    mb.invokestatic JavaUtil, "convertRubyToJavaFloat", [mb.float, IRubyObject]
    mb.freturn
  elsif mb.double == retval
    mb.invokestatic JavaUtil, "convertRubyToJavaDouble", [mb.double, IRubyObject]
    mb.dreturn
  elsif retval == mb.void || retval == nil
    mb.pop
    mb.returnvoid
  else
    mb.ldc retval
    mb.invokestatic JavaUtil, "convertRubyToJava", [JObject, IRubyObject, JClass]
    mb.areturn
  end
end

#process_class(ruby_class_path, ruby_class, java_name, *require_files) ⇒ Object 



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# File 'lib/compiler.rb', line 32

def process_class(ruby_class_path, ruby_class, java_name, *require_files)
  @file_builder.package = ruby_class.package_name if ruby_class.package_name

  cb = @file_builder.public_class(java_name, RubyObject, *ruby_class.interfaces);

  # field to hold the RubyClass reference
  cb.private_static_field "__ruby_class__", RubyClass

  # If a require file is specified, load it in static initializer
  cb.static_init do
    invokestatic Ruby, "getGlobalRuntime", [Ruby]
    require_files.each do |require_file|
      dup
      ldc File.read(require_file)
      ldc require_file
      invokevirtual Ruby, "executeScript", [IRubyObject, cb.string, cb.string]
      pop
    end
    ldc ruby_class_path
    invokevirtual Ruby, "getClass", [RubyClass, cb.string]
    dup
    putstatic this, "__ruby_class__", RubyClass
    ldc this.name
    invokestatic JClass, "forName", [JClass, string]
    invokevirtual RubyClass, "setClassAllocator", [void, JClass]
    # load the script contents into the class file
    returnvoid
  end

  cb.public_constructor do
    aload 0
    invokestatic Ruby, "getGlobalRuntime", [Ruby]
    getstatic this, "__ruby_class__", RubyClass
    invokespecial RubyObject, "<init>", [cb.void, Ruby, RubyClass]
    returnvoid
  end

  for method_name in ruby_class.public_instance_methods(false) do
    method = ruby_class.instance_method(method_name)
    signatures = if ruby_class.respond_to? :signatures
      ruby_class.signatures[method_name]
    else
      nil
    end
    annotations = if ruby_class.respond_to? :annotations
      ruby_class.annotations[method_name]
    else
      nil
    end

    create_method(cb, method_name, method, signatures, annotations)
  end

  for method_name in ruby_class.public_methods(false) do
    method = ruby_class.method(method_name)
    signatures = if ruby_class.respond_to? :static_signatures
      ruby_class.static_signatures[method_name]
    else
      nil
    end
    annotations = if ruby_class.respond_to? :static_annotations
      ruby_class.static_annotations[method_name]
    else
      nil
    end

    create_method(cb, method_name, method, signatures, annotations, :static => true)
  end
end

#ruby_args(mb, method, ruby_index, options = {}) ⇒ Object 



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# File 'lib/compiler.rb', line 205

def ruby_args(mb, method, ruby_index, options = {})
  if method.arity < 0
    # restarg or optarg, just pass array through
    mb.aload options[:static] ? 0 : 1
  else
    # all normal args, box them up
    mb.ldc method.arity
    mb.anewarray IRubyObject
    i = ruby_index;
    base = options[:static] ? 0 : 1
    0.upto(method.arity - 1) do |i|
      mb.dup
      mb.ldc i
      mb.aload i + base
      mb.aastore
    end
  end
end

#ruby_return(mb, retval) ⇒ Object 



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# File 'lib/compiler.rb', line 224

def ruby_return(mb, retval)
  mb.areturn
end

#write_files ⇒ Object 



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# File 'lib/compiler.rb', line 23

def write_files
  @file_builder.generate do |name, builder|
    FileUtils.mkdir_p File.dirname(name)
    File.open(name, 'w') do |f|
      f.write(builder.generate)
    end
  end
end