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require 'bitescript'
require File.dirname(__FILE__) + '/signature'
module JRuby
class JavaCompiler
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
def initialize(source_name)
@file_builder = BiteScript::FileBuilder.new(source_name)
end
def write_files
@file_builder.generate do |name, builder|
File.open(name, 'w') do |f|
f.write(builder.generate)
end
end
end
def process_class(ruby_class_path, ruby_class, java_name, require_file = nil, java_package = nil)
if java_package
cb = @file_builder.package(java_package).public_class(java_name, RubyObject);
else
cb = @file_builder.public_class(java_name, RubyObject);
end
# If a require file is specified, load it in static initializer
if require_file
cb.static_init do
invokestatic Ruby, "getGlobalRuntime", [Ruby]
invokevirtual Ruby, "getLoadService", [LoadService]
ldc require_file
invokevirtual LoadService, "require", [cb.boolean, cb.string]
returnvoid
end
end
cb.public_constructor do
aload 0
invokestatic Ruby, "getGlobalRuntime", [Ruby]
dup
ldc ruby_class_path
invokevirtual Ruby, "getClass", [RubyClass, cb.string]
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)
signature = 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, signature, annotations)
end
end
def create_method(cb, method_name, method, signature = nil, annotations = nil)
if signature
raise "signatures only supported for exact arities: #{RUBY_CLASS.to_s + '#' + method_name}" if method.arity < 0
params = signature.keys[0]
retval = signature[params]
else
params = (method.arity < 0) ? [IRubyObject[]] : [IRubyObject] * method.arity
retval = IRubyObject
end
mb = cb.public_method method_name, retval, *params
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
mb.aload 0
mb.dup
mb.invokeinterface IRubyObject, "getRuntime", [Ruby]
ruby_index = first_local(params)
mb.dup; mb.astore ruby_index
mb.invokevirtual Ruby, "getCurrentContext", [ThreadContext]
mb.ldc method_name
# TODO: arity-specific calling
if signature
java_args(mb, method, params, ruby_index)
else
ruby_args(mb, method)
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 signature
java_return(mb, retval)
else
ruby_return(mb, retval)
end
mb.stop
end
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
def java_args(mb, method, params, ruby_index)
# We have a signature and need to use java integration logic
mb.ldc method.arity
mb.anewarray IRubyObject
index = 1
1.upto(method.arity) do |i|
mb.dup
mb.ldc i - 1
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
mb.invokestatic JavaUtil, "convertJavaToRuby", [IRubyObject, Ruby, mb.int]
elsif mb.long == param_type
mb.lload index
mb.invokestatic JavaUtil, "convertJavaToRuby", [IRubyObject, Ruby, mb.long]
index += 1
elsif mb.float == param_type
mb.fload index
mb.invokestatic JavaUtil, "convertJavaToRuby", [IRubyObject, Ruby, mb.float]
elsif mb.double == param_type
mb.dload index
mb.invokestatic JavaUtil, "convertJavaToRuby", [IRubyObject, Ruby, mb.double]
index += 1
else
mb.aload i
mb.invokestatic JavaUtil, "convertJavaToUsableRubyObject", [IRubyObject, Ruby, mb.object]
end
mb.aastore
index += 1
end
end
def ruby_args(mb, method)
if method.arity < 0
# restarg or optarg, just pass array through
mb.aload 1
else
# all normal args, box them up
mb.ldc method.arity
mb.anewarray IRubyObject
i = 1;
1.upto(method.arity) do |i|
mb.dup
mb.ldc i - 1
mb.aload i
mb.aastore
end
end
end
def ruby_return(mb, retval)
mb.areturn
end
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
end
end
if $0 == __FILE__
java_classname = ARGV[0]
ruby_classname = ARGV[1]
ruby_filename = ARGV[2]
unless java_classname && ruby_classname && ruby_filename
puts "usage: compiler2 <java class name> <ruby class name> <ruby library>"
exit 1
end
require ruby_filename
ruby_class = eval(ruby_classname)
java_compiler = JRuby::JavaCompiler.new(ruby_filename)
java_compiler.process_class(ruby_classname, ruby_class, java_classname, ruby_filename)
java_compiler.write_files
end