Class: Mirah::JVM::Compiler::JVMBytecode

Inherits:
Base
  • Object
show all
Includes:
MethodLookup, Logging::Logged
Defined in:
lib/mirah/jvm/compiler/jvm_bytecode.rb

Direct Known Subclasses

ClosureCompiler

Defined Under Namespace

Classes: ClosureCompiler, FunctionalCall, Super

Constant Summary collapse

Types = 
Mirah::JVM::Types

Constants included from Logging::Logged

Logging::Logged::VLEVELS

Class Attribute Summary collapse

Attributes inherited from Base

#class, #filename, #method, #static

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Logging::Logged

#error, #info, #log, #logger, #logging?, #vlog, #warning

Methods included from MethodLookup

#each_is_exact, #each_is_exact_or_subtype_or_convertible, #field_lookup, #find_jls, #find_jls2, #find_method, #find_method2, #inner_class, #is_more_specific?, #phase1, #phase2, #phase3, #primitive_convertible?

Methods inherited from Base

#base_define_method, #containing_scope, #create_method_builder, #defaultNode, #error, #generate, #get_scope, #inferred_type, #introduced_scope, #scoped_body, #scoped_local_name, #supports_invokedynamic?, #target_jvm_version, #toplevel_class, #visit, #visitArguments, #visitCharLiteral, #visitClassAppendSelf, #visitClassDefinition, #visitFixnum, #visitImplicitSelf, #visitImport, #visitMacroDefinition, #visitNoop, #visitPackage, #visitScript, #visitSelf, #visitStaticMethodDefinition, #visitUnquote, #with

Constructor Details

#initialize(config, scoper, typer) ⇒ JVMBytecode

Returns a new instance of JVMBytecode.



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 45

def initialize(config, scoper, typer)
  super
  @jump_scope = []
end

Class Attribute Details

.verbose ⇒ Object

Returns the value of attribute verbose.



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 37

def verbose
  @verbose
end

Class Method Details

.classname_from_filename(filename) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 39

def classname_from_filename(filename)
  basename = File.basename(filename).sub(/\.(duby|mirah)$/, '')
  basename.split(/[_-]/).map{|x| x[0...1].upcase + x[1..-1]}.join
end

Instance Method Details

#annotate(builder, annotations) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 592

def annotate(builder, annotations)
  annotations.each do |annotation|
    next if annotation.type.typeref.name.start_with?('org.mirah.jvm.')
    type = inferred_type(annotation)
    mirror = type.jvm_type
    if mirror.respond_to?(:getDeclaredAnnotation)
      retention = mirror.getDeclaredAnnotation('java.lang.annotation.Retention')
    else
      raise "Unsupported annotation #{mirror} (#{mirror.class})"
    end
    next if retention && retention.value.name == 'SOURCE'
    runtime_retention = (retention && retention.value.name == 'RUNTIME')
    builder.annotate(mirror, runtime_retention) do |visitor|
      annotation.values.each do |entry|
        annotation_value(get_scope(annotation), type, visitor,
                         entry.key.identifier, entry.value)
      end
    end
  end
end

#annotation_value(scope, type, builder, name, value) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 613

def annotation_value(scope, type, builder, name, value)
  if name
    value_type = type.unmeta.java_method(name).return_type
    if value_type.array?
      unless value.kind_of?(Array)
        raise "#{type.name}.#{name} should be an Array, got #{value.class}"
      end
      builder.array(name) do |child|
        value.values.each do |item|
          annotation_value(scope, value_type.component_type, child, nil, item)
        end
      end
      return
    end
  else
    value_type = type
  end
  primitive_classes = {
    'Z' => java.lang.Boolean,
    'B' => java.lang.Byte,
    'C' => java.lang.Character,
    'S' => java.lang.Short,
    'I' => java.lang.Integer,
    'J' => java.lang.Long,
    'F' => java.lang.Float,
    'D' => java.lang.Double,
  }
  descriptor = BiteScript::Signature::class_id(value_type)
  case descriptor
  when 'Ljava/lang/String;'
    string_value = if value.kind_of?(StringConcat)
      value.strings.map {|x| x.identifier}.join
    else
      value.identifier
    end
    builder.visit(name, string_value)
  when 'Ljava/lang/Class;'
    mirror = @typer.type_system.type(scope, value.typeref.name)
    klass = if value.typeref.isArray
      BiteScript::ASM::Type.get("[#{mirror.type.descriptor}")
    else
      mirror
    end
    builder.visit(name, klass)
  when *primitive_classes.keys
    klass = primitive_classes[descriptor]
    builder.visit(name, klass.new(value.value))
  else
    if value_type.jvm_type.enum?
      builder.enum(name, value_type, value.identifier)
    elsif value_type.jvm_type.annotation?
      subtype = inferred_type(value)
      mirror = subtype.jvm_type
      builder.annotation(name, mirror) do |child|
        value.values.each do |entry|
          annotation_value(scope, subtype, child, entry.key.identifier, entry.value)
        end
      end
    else
      raise "Unsupported annotation #{descriptor} #{name} = #{value.class}"
    end
  end
end

#begin_main ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 107

def begin_main
  # declare argv variable
  @method.local('argv', @typer.type_system.type(nil, 'string', true))
end

#binding_reference ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 1027

def binding_reference
  @method.aload(@method.local('$binding'))
end

#captured_local(scope, name, type) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 741

def captured_local(scope, name, type)
  captured_local_declare(scope, name, type)
  binding_reference
  @method.getfield(scope.binding_type, name, type)
end

#captured_local_assign(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 774

def captured_local_assign(node, expression)
  scope, name = containing_scope(node), node.name.identifier
  type = get_scope(node).local_type(name).resolve
  captured_local_declare(scope, name, type)
  binding_reference
  visit(node.value, true)
  convert_value(inferred_type(node.value), type)

  # if expression, dup the value we're assigning
  if expression
    dup_x2_value type
  end
  set_position(node.position)
  @method.putfield(scope.binding_type, name, type)
end

#captured_local_declare(scope, name, type) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 717

def captured_local_declare(scope, name, type)
  unless declared_captures[name]
    declared_captures[name] = type
    # default should be fine, but I don't think bitescript supports it.
    @binding.protected_field(name, type)
  end
end

#declare_field(name, type, annotations, static_field) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 813

def declare_field(name, type, annotations, static_field)
  # TODO confirm types are compatible
  unless declared_fields[name]
    declared_fields[name] = type
    field = if static || static_field
      @class.private_static_field name, type
    else
      @class.private_field name, type
    end
    annotate(field, annotations)
  end
end

#declare_local(scope, name, type) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 681

def declare_local(scope, name, type)
  # TODO confirm types are compatible
  name = scoped_local_name(name, scope)
  unless declared_locals[name]
    declared_locals[name] = type
    index = @method.local(name, type)
  end
end

#declare_locals(scope) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 690

def declare_locals(scope)
  scope.locals.each do |name|
    unless scope.captured?(name) || declared?(scope, name)
      type = scope.local_type(name)
      type = type.resolve if type.kind_of?(TypeFuture)
      declare_local(scope, name, type)
      type.init_value(@method)
      type.store(@method, @method.local(scoped_local_name(name, scope), type))
    end
  end
end

#declared?(scope, name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 677

def declared?(scope, name)
  declared_locals.include?(scoped_local_name(name, scope))
end

#declared_captures(binding = nil) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 706

def declared_captures(binding=nil)
  @captured_locals[binding || @binding]
end

#declared_fields ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 808

def declared_fields
  @declared_fields ||= {}
  @declared_fields[@class] ||= {}
end

#declared_locals ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 588

def declared_locals
  @declared_locals ||= {}
end

#define_optarg_chain(name, arg, return_type, args_for_opt, arg_types_for_opt) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 161

def define_optarg_chain(name, arg, return_type,
  args_for_opt, arg_types_for_opt)
  # declare all args so they get their values
  @method.aload(0) unless @static
  args_for_opt.each do |req_arg|
    inferred_type(req_arg).load(@method, @method.local(req_arg.name.identifier, inferred_type(req_arg)))
  end
  visit(arg.value, true)

  # invoke the next one in the chain
  if @static
    @method.invokestatic(@class, name.to_s, [return_type] + arg_types_for_opt + [inferred_type(arg)])
  else
    @method.invokevirtual(@class, name.to_s, [return_type] + arg_types_for_opt + [inferred_type(arg)])
  end

  return_type.return(@method)
end

#extract_method(call) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 426

def extract_method(call)
  target = inferred_type(call.target)
  params = call.parameters.map do |param|
    inferred_type(param)
  end
  target.get_method(call.name.identifier, params)
end

#file_builder(filename) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 54

def file_builder(filename)
  builder = BiteScript::FileBuilder.new(filename)
  builder.to_widen do |_a, _b|
    a = @typer.type_system.get_type(_a.tr('/', '.'))
    b = @typer.type_system.get_type(_b.tr('/', '.'))
    a_ancestors = []
    while a
      a_ancestors << a.name
      a = a.superclass
    end
    b_ancestors = []
    while b
      b_ancestors << b.name
      b = b.superclass
    end
    intersection = (a_ancestors & b_ancestors)
    if intersection.size == 0
      puts "#{_a} => #{a}, #{_b} => #{b}"
      puts "#{a_ancestors.inspect} & #{b_ancestors.inspect} = []"
      'java/lang/Object'
    else
      intersection[0].gsub('.', '/')
    end
  end
  @typer.type_system.define_types(builder)
  builder
end

#find_ensures(before) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 96

def find_ensures(before)
  found = []
  @jump_scope.reverse_each do |scope|
    if Ensure === scope
      found << scope
    end
    break if before === scope
  end
  found
end

#finish_main ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 112

def finish_main
  @method.returnvoid
end

#get_binding(type) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 702

def get_binding(type)
  @bindings[type]
end

#handle_ensures(nodes) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 1103

def handle_ensures(nodes)
  nodes.each do |ensure_node|
    visit(ensure_node.ensureClause, false)
  end
end

#jump_if(predicate, target) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 386

def jump_if(predicate, target)
  type = inferred_type(predicate)
  if type.primitive?
    raise "Expected boolean, found #{type}" unless type.name == 'boolean'
  end
  if Call === predicate
    method = extract_method(predicate)
    if method.respond_to? :jump_if
      method.jump_if(self, predicate, target)
      return
    end
  end
  visit(predicate, true)
  if type.primitive?
    @method.ifne(target)
  else
    @method.ifnonnull(target)
  end
end

#jump_if_not(predicate, target) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 406

def jump_if_not(predicate, target)
  type = inferred_type(predicate)
  if type.primitive?
    raise "Expected boolean, found #{type}" unless type.name == 'boolean'
  end
  if Call === predicate
    method = extract_method(predicate)
    if method.respond_to? :jump_if_not
      method.jump_if_not(self, predicate, target)
      return
    end
  end
  visit(predicate, true)
  if type.primitive?
    @method.ifeq(target)
  else
    @method.ifnull(target)
  end
end

#local(scope, name, type) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 737

def local(scope, name, type)
  type.load(@method, @method.local(scoped_local_name(name, scope), type))
end

#local_assign(local, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 756

def local_assign(local, expression)
  name = local.name.identifier
  type = inferred_type(local)
  scope = containing_scope(local)
  declare_local(scope, name, type)

  visit(local.value, true)
  convert_value inferred_type(local.value), type

  # if expression, dup the value we're assigning
  if expression
    dup_value type
  end

  set_position(local.position)
  type.store(@method, @method.local(scoped_local_name(name, scope), type))
end

#logger_name ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 50

def logger_name
  "org.mirah.ruby.JVM.Compiler.JVMBytecode"
end

#method_body(method, args, node, return_type) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 225

def method_body(method, args, node, return_type)
  body = node.body
  with(:method => method,
  :declared_locals => {}) do

    method.start

    scope = introduced_scope(node)

    # declare all args so they get their values
    if args
      args.each {|arg| declare_local(scope, arg.name.identifier, inferred_type(arg))}
    end
    declare_locals(scope)

    yield if block_given?

    prepare_binding(node) do
      expression = return_type.name != 'void'
      if body
        if expression
          body_type = inferred_type(body)
          unless return_type.assignableFrom(body_type)
            error("Invalid return type #{body_type.name}, expected #{return_type.name}", body)
          end
        end
        visit(body, expression)
        convert_value inferred_type(body), return_type if expression
      end
    end

    return_type.return(@method) unless return_type.name == ':unreachable'

    @method.stop
  end
end

#output_type ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 82

def output_type
  "classes"
end

#prepare_binding(node) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 116

def prepare_binding(node)
  scope = introduced_scope(node)
  if scope.has_binding?
    type = scope.binding_type
    @binding = @bindings[type]
    @method.new type
    @method.dup
    @method.invokespecial type, "<init>", [@method.void]
    if node.respond_to? :arguments
      node.arguments.required.each do |param|
        name = param.name.identifier
        param_type = inferred_type(param)
        if scope.captured?(param.name.identifier)
          @method.dup
          param_type.load(@method, @method.local(name, param_type))
          @method.putfield(type, name, param_type)
        end
      end
    end
    type.store(@method, @method.local('$binding', type))
  end
  begin
    yield
  ensure
    if scope.has_binding?
      @binding.stop
      @binding = nil
    end
  end
end

#print(print_node) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 1040

def print(print_node)
  @method.getstatic System, "out", PrintStream
  print_node.parameters.each {|param| visit(param, true)}
  params = print_node.parameters.map {|param| inferred_type(param).jvm_type}
  method_name = print_node.println ? "println" : "print"
  method = find_method(PrintStream.java_class, method_name, params, nil, false)
  if (method)
    @method.invokevirtual(
    PrintStream,
    method_name,
    [method.return_type, *method.parameter_types])
  else
    log "Could not find a match for #{PrintStream}.#{method_name}(#{params})"
    fail "Could not compile"
  end
end

#push_jump_scope(node) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 86

def push_jump_scope(node)
  raise "Not a node" unless Node === node
  begin
    @jump_scope << node
    yield
  ensure
    @jump_scope.pop
  end
end

#real_self ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 1031

def real_self
  method.aload(0)
end

#set_position(position) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 1035

def set_position(position)
  # TODO support positions from multiple files
  @method.line(position.start_line) if @method && position
end

#visitArray(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 928

def visitArray(node, expression)
  set_position(node.position)
  if expression
    # create basic arraylist
    @method.new java::util::ArrayList
    @method.dup
    @method.ldc_int node.values_size
    @method.invokespecial java::util::ArrayList, "<init>", [@method.void, @method.int]

    # elements, as expressions
    # TODO: ensure they're all reference types!
    node.values.each do |n|
      @method.dup
      visit(n, true)
      # TODO this feels like it should be in the node.compile itself
      if inferred_type(n).primitive?
        inferred_type(n).box(@method)
      end
      @method.invokeinterface java::util::List, "add", [@method.boolean, @method.object]
      @method.pop
    end
  else
    # elements, as non-expressions
    # TODO: ensure they're all reference types!
    node.values.each do |n|
      visit(n, true)
      # TODO this feels like it should be in the node.compile itself
      if inferred_type(n).primitive?
        inferred_type(n).box(@method)
      end
    end
  end
end

#visitAttrAssign(call, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 434

def visitAttrAssign(call, expression)
  target = inferred_type(call.target)
  value_type = inferred_type(call.value)
  setter = "#{call.name.identifier}_set"
  method = target.get_method(setter, [value_type])
  if method
    method.call(self, call, expression, [call.value])
  else
    target = inferred_type(call.target)
    raise "Missing method #{target.full_name}.#{setter}(#{value_type.full_name})"
  end
end

#visitBindingReference(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 1023

def visitBindingReference(node, expression)
  binding_reference
end

#visitBoolean(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 908

def visitBoolean(node, expression)
  if expression
    set_position(node.position)
    node.value ? @method.iconst_1 : @method.iconst_0
  end
end

#visitBreak(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 365

def visitBreak(node, expression)
  error("break outside of loop", node) unless @break_label
  handle_ensures(find_ensures(Loop))
  set_position node.position
  @method.goto(@break_label)
end

#visitCall(call, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 447

def visitCall(call, expression)
  method = extract_method(call)
  if method
    method.call(self, call, expression)
  else
    params = call.parameters.map do |param|
      inferred_type(param)
    end
    target = inferred_type(call.target)
    raise "Missing method #{target}.#{call.name.identifier}(#{params.join ', '})"
  end
end

#visitCast(fcall, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 529

def visitCast(fcall, expression)
  # casting operation, not a call
  castee = fcall.value

  # TODO move errors to inference phase
  source_type_name = inferred_type(castee).name
  target_type_name = inferred_type(fcall).name
  if inferred_type(castee).primitive?
    if inferred_type(fcall).primitive?
      if source_type_name == 'boolean' && target_type_name != "boolean"
        raise TypeError.new "not a boolean type: #{inferred_type(castee)}"
      end
      # ok
      primitive = true
    else
      raise TypeError.new "Cannot cast #{inferred_type(castee)} to #{inferred_type(fcall)}: not a reference type."
    end
  elsif inferred_type(fcall).primitive?
    raise TypeError.new "not a primitive type: #{inferred_type(castee)}"
  else
    # ok
    primitive = false
  end

  visit(castee, expression)
  if expression
    if primitive
      source_type_name = 'int' if %w[byte short char].include? source_type_name
      if (source_type_name != 'int') && (%w[byte short char].include? target_type_name)
        target_type_name = 'int'
      end

      if source_type_name != target_type_name
        if RUBY_VERSION == "1.9"
          @method.send "#{source_type_name[0]}2#{target_type_name[0]}"
        else
          @method.send "#{source_type_name[0].chr}2#{target_type_name[0].chr}"
        end
      end
    else
      if (source_type_name != target_type_name ||
        inferred_type(castee).array? != inferred_type(fcall).array?)
        @method.checkcast inferred_type(fcall)
      end
    end
  end
end

#visitClosureDefinition(class_def, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 262

def visitClosureDefinition(class_def, expression)
  compiler = ClosureCompiler.new(@config, @file, @type, self, @scoper, @typer)
  compiler.visitClassDefinition(class_def, expression)
end

#visitConstructorDefinition(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 180

def visitConstructorDefinition(node, expression)
  push_jump_scope(node) do
    super(node, true) do |method, args|
      method_body(method, args, node, @typer.type_system.type(nil, 'void')) do
        method.aload 0
        scope = introduced_scope(node)
        if node.body.size > 0 &&
            (node.body(0).kind_of?(Super) || node.body(0).kind_of?(ZSuper))
          super_node = node.body(0)
          delegate_class = @type.superclass
          delegate_types = []
          if super_node.kind_of?(ZSuper)
            [node.arguments.required,
             node.arguments.optional,
             node.arguments.required2
            ].each do |args|
              args.each do |arg|
                arg_type = inferred_type(arg)
                delegate_types << arg_type
                local(scope, arg.name.identifier, arg_type)
              end
            end
          else
            super_node.parameters.each do |param|
              param_type = inferred_type(param)
              delegate_types << param_type
              visit(param, true)
            end
          end
          constructor = delegate_class.constructor(*delegate_types)
          method.invokespecial(
          delegate_class, "<init>",
          [@method.void, *constructor.argument_types])
        else
          unless (node.body.size > 0 &&
                  node.body(0).kind_of?(FunctionalCall) &&
                  node.body(0).name.identifier == 'initialize')
            method.invokespecial @class.superclass, "<init>", [@method.void]
          end
        end
      end
    end
  end
end

#visitEmptyArray(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 1128

def visitEmptyArray(node, expression)
  if expression
    visit(node.size, true)
    type = @typer.type_system.get(@scoper.getScope(node), node.type).resolve
    type.newarray(@method)
  end
end

#visitEnsure(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 1109

def visitEnsure(node, expression)
  # TODO this doesn't appear to be used
  #node.state = @method.label  # Save the ensure target for JumpNodes
  start = @method.label.set!
  body_end = @method.label
  done = @method.label
  push_jump_scope(node) do
    visit(node.body, expression)  # First compile the body
  end
  body_end.set!
  handle_ensures([node])  # run the ensure clause
  @method.goto(done)  # and continue on after the exception handler
  target = @method.label.set!  # Finally, create the exception handler
  @method.trycatch(start, body_end, target, nil)
  handle_ensures([node])
  @method.athrow
  done.set!
end

#visitFieldAccess(field, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 790

def visitFieldAccess(field, expression)
  return nil unless expression
  name = field.name.identifier

  real_type = declared_fields[name] || inferred_type(field)
  declare_field(name, real_type, [], field.isStatic)

  set_position(field.position)
  # load self object unless static
  method.aload 0 unless static || field.isStatic

  if static || field.isStatic
    @method.getstatic(@class, name, inferred_type(field))
  else
    @method.getfield(@class, name, inferred_type(field))
  end
end

#visitFieldAssign(field, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 830

def visitFieldAssign(field, expression)
  name = field.name.identifier

  real_type = declared_fields[name] || inferred_type(field)

  declare_field(name, real_type, field.annotations, field.isStatic)

  method.aload 0 unless static || field.isStatic
  visit(field.value, true)
  if expression
    instruction = 'dup'
    instruction << '2' if real_type.wide?
    instruction << '_x1' unless static || field.isStatic
    method.send instruction
  end
  set_position(field.position)
  if static || field.isStatic
    @method.putstatic(@class, name, real_type)
  else
    @method.putfield(@class, name, real_type)
  end
end

#visitFieldDeclaration(decl, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 826

def visitFieldDeclaration(decl, expression)
  declare_field(decl.name.identifier, inferred_type(decl), decl.annotations, decl.isStatic)
end

#visitFunctionalCall(fcall, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 472

def visitFunctionalCall(fcall, expression)
  scope = get_scope(fcall)
  type = get_scope(fcall).self_type.resolve
  type = type.meta if (@static && type == @type)
  fcall.target = ImplicitSelf.new
  fcall.target.parent = fcall
  @typer.infer(fcall.target)

  params = fcall.parameters.map do |param|
    inferred_type(param)
  end
  name = fcall.name.identifier
  chained_constructor = false
  if name == 'initialize'
    if scope.context.kind_of?(ConstructorDefinition) &&
        scope.context.body(0) == fcall
      name = '<init>'
      chained_constructor = true
    end
  end

  method = type.get_method(name, params)
  unless method
    target = static ? @class.name : 'self'

    raise NameError, "No method %s.%s(%s)" %
    [target, fcall.name.identifier, params.join(', ')]
  end
  if chained_constructor
    method.call(self, fcall, expression, nil, true)
  else
    method.call(self, fcall, expression)
  end
end

#visitHash(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 962

def visitHash(node, expression)
  set_position(node.position)
  if expression
    # create basic arraylist
    @method.new java::util::HashMap
    @method.dup
    @method.ldc_int [node.size / 0.75, 16].max.to_i
    @method.invokespecial java::util::HashMap, "<init>", [@method.void, @method.int]

    node.each do |e|
      @method.dup
      [e.key, e.value].each do |n|
        visit(n, true)
        # TODO this feels like it should be in the node.compile itself
        if inferred_type(n).primitive?
          inferred_type(n).box(@method)
        end
      end
      @method.invokeinterface java::util::Map, "put", [@method.object, @method.object, @method.object]
      @method.pop
    end
  else
    # elements, as non-expressions
    node.each do |n|
      visit(n.key, false)
      visit(n.value, false)
    end
  end
end

#visitIf(iff, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 271

def visitIf(iff, expression)
  elselabel = @method.label
  donelabel = @method.label

  # this is ugly...need a better way to abstract the idea of compiling a
  # conditional branch while still fitting into JVM opcodes
  predicate = iff.condition
  body = iff.body
  elseBody = iff.elseBody
  if body.is_a?(NodeList) && body.size == 0
    body = nil
  end
  if elseBody.is_a?(NodeList) && elseBody.size == 0
    elseBody = nil
  end
  if body || expression
    jump_if_not(predicate, elselabel)

    if body
      visit(body, expression)
    elsif expression
      inferred_type(iff).init_value(@method)
    end

    @method.goto(donelabel)
  else
    jump_if(predicate, donelabel)
  end

  elselabel.set!

  if elseBody
    visit(elseBody, expression)
  elsif expression
    inferred_type(iff).init_value(@method)
  end

  donelabel.set!
end

#visitImplicitNil(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 1019

def visitImplicitNil(node, expression)
  visitNull(node, expression)
end

#visitInterfaceDeclaration(class_def, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 267

def visitInterfaceDeclaration(class_def, expression)
  visitClassDefinition(class_def, expression)
end

#visitLocalAccess(local, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 725

def visitLocalAccess(local, expression)
  if expression
    set_position(local.position)
    scope = get_scope(local)
    if scope.has_binding? && scope.captured?(local.name.identifier)
      captured_local(scope, local.name.identifier, inferred_type(local))
    else
      local(containing_scope(local), local.name.identifier, inferred_type(local))
    end
  end
end

#visitLocalAssignment(local, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 747

def visitLocalAssignment(local, expression)
  scope = get_scope(local)
  if scope.has_binding? && scope.captured?(local.name.identifier)
    captured_local_assign(local, expression)
  else
    local_assign(local, expression)
  end
end

#visitLocalDeclaration(local, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 710

def visitLocalDeclaration(local, expression)
  scope = get_scope(local)
  if scope.has_binding? && scope.captured?(local.name.identifier)
    captured_local_declare(scope, local.name.identifier, inferred_type(local))
  end
end

#visitLoop(loop, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 311

def visitLoop(loop, expression)
  push_jump_scope(loop) do
    with(:break_label => @method.label,
         :redo_label => @method.label,
         :next_label => @method.label) do
      predicate = loop.condition

      visit(loop.init, false)

      pre_label = @redo_label

      unless loop.skipFirstCheck
        @next_label.set! unless loop.post_size > 0
        if loop.negative
          # if condition, exit
          jump_if(predicate, @break_label)
        else
          # if not condition, exit
          jump_if_not(predicate, @break_label)
        end
      end

      if loop.pre_size > 0
        pre_label = method.label
        pre_label.set!
        visit(loop.pre, false)
      end


      @redo_label.set!
      visit(loop.body, false) if loop.body

      if loop.skipFirstCheck || loop.post_size > 0
        @next_label.set!
        visit(loop.post, false)
        if loop.negative
          # if not condition, continue
          jump_if_not(predicate, pre_label)
        else
          # if condition, continue
          jump_if(predicate, pre_label)
        end
      else
        @method.goto(@next_label)
      end

      @break_label.set!

      # loops always evaluate to null
      @method.aconst_null if expression
    end
  end
end

#visitMethodDefinition(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 147

def visitMethodDefinition(node, expression)
  push_jump_scope(node) do
    base_define_method(node) do |method, arg_types|
      return if @class.interface? || node.annotated_abstract?
      is_static = self.static || node.kind_of?(StaticMethodDefinition)

      log "Starting new #{is_static ? 'static ' : ''}method #{node.name.identifier}(#{arg_types})"
      args = visit(node.arguments, true)
      method_body(method, args, node, inferred_type(node).returnType)
      log "Method #{node.name.identifier}(#{arg_types}) complete!"
    end
  end
end

#visitNext(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 372

def visitNext(node, expression)
  error("next outside of loop", node) unless @next_label
  handle_ensures(find_ensures(Loop))
  set_position node.position
  @method.goto(@next_label)
end

#visitNodeList(body, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 577

def visitNodeList(body, expression)
  # last element is an expression only if the body is an expression
  super(body, expression) do |last|
    if last
      visit(last, expression)
    elsif expression
      inferred_type(body).init_value(method)
    end
  end
end

#visitNot(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 992

def visitNot(node, expression)
  visit(node.value, expression)
  if expression
    set_position(node.position)
    type = inferred_type(node.value)
    done = @method.label
    else_label = @method.label
    if type.primitive?
      @method.ifeq else_label
    else
      @method.ifnull else_label
    end
    @method.iconst_0
    @method.goto done
    else_label.set!
    @method.iconst_1
    done.set!
  end
end

#visitNull(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 1012

def visitNull(node, expression)
  if expression
    set_position(node.position)
    @method.aconst_null
  end
end

#visitRaise(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 1064

def visitRaise(node, expression)
  visit(node.args(0), true)
  set_position(node.position)
  @method.athrow
end

#visitRedo(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 379

def visitRedo(node, expression)
  error("redo outside of loop", node) unless @redo_label
  handle_ensures(find_ensures(Loop))
  set_position node.position
  @method.goto(@redo_label)
end

#visitRegex(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 915

def visitRegex(node, expression)
  # TODO: translate flags to Java-appropriate values
  if node.strings_size == 1
    visit(node.strings(0), expression)
  else
    visitStringConcat(node, expression)
  end
  if expression
    set_position(node.position)
    @method.invokestatic java::util::regex::Pattern, "compile", [java::util::regex::Pattern, @method.string]
  end
end

#visitRescue(rescue_node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 1070

def visitRescue(rescue_node, expression)
  start = @method.label.set!
  body_end = @method.label
  done = @method.label
  no_else_clauses = rescue_node.else_clause.size == 0

  visit(rescue_node.body, expression && no_else_clauses)
  body_end.set!

  visit(rescue_node.else_clause, expression) unless no_else_clauses
  return if start.label.offset == body_end.label.offset

  @method.goto(done)
  rescue_node.clauses.each do |clause|
    target = @method.label.set!
    if clause.name
      types = clause.types.map {|t| inferred_type(t)}
      widened_type = types.inject {|a, b| a.widen(b)}
      @method.astore(declare_local(introduced_scope(clause), clause.name.identifier, widened_type))
    else
      @method.pop
    end
    declare_locals(introduced_scope(clause))
    visit(clause.body, expression)
    @method.goto(done)
    clause.types.each do |type|
      type = inferred_type(type)
      @method.trycatch(start, body_end, target, type)
    end
  end
  done.set!
end

#visitReturn(return_node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 1057

def visitReturn(return_node, expression)
  visit(return_node.value, true) if return_node.value
  handle_ensures(find_ensures(MethodDefinition))
  set_position return_node.position
  inferred_type(return_node).return(@method)
end

#visitSimpleString(string, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 853

def visitSimpleString(string, expression)
  set_position(string.position)
  @method.ldc(string.value) if expression
end

#visitStringConcat(strcat, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 858

def visitStringConcat(strcat, expression)
  set_position(strcat.position)
  if expression
    # could probably be more efficient with non-default constructor
    builder_class = @typer.type_system.type(nil, 'java.lang.StringBuilder')
    @method.new builder_class
    @method.dup
    @method.invokespecial builder_class, "<init>", [@method.void]

    strcat.strings.each do |node|
      visit(node, true)
      method = find_method(builder_class, "append", [inferred_type(node)], nil, false)
      if method
        @method.invokevirtual builder_class, "append", [method.return_type, *method.argument_types]
      else
        log "Could not find a match for #{java::lang::StringBuilder}.append(#{inferred_type(node)})"
        fail "Could not compile"
      end
    end

    # convert to string
    set_position(strcat.position)
    @method.invokevirtual java::lang::StringBuilder.java_class, "toString", [@method.string]
  else
    strcat.strings.each do |node|
      visit(node, false)
    end
  end
end

#visitStringEval(node, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 888

def visitStringEval(node, expression)
  if expression
    visit(node.value, true)
    set_position(node.position)
    inferred_type(node.value).box(@method) if inferred_type(node.value).primitive?
    null = method.label
    done = method.label
    method.dup
    method.ifnull(null)
    @method.invokevirtual @method.object, "toString", [@method.string]
    @method.goto(done)
    null.set!
    method.pop
    method.ldc("null")
    done.set!
  else
    visit(node.value, false)
  end
end

#visitSuper(sup, expression) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 507

def visitSuper(sup, expression)
  mdef = sup.findAncestor(MethodDefinition.java_class)
  # FIXME Horrible hack
  return if mdef.kind_of?(ConstructorDefinition)
  type = @type.superclass
  super_type = @typer.type_system.getSuperClass(get_scope(sup).self_type)
  @typer.infer(sup.target)

  sup.name = mdef.name.identifier

  # TODO ZSuper
  params = sup.parameters.map do |param|
    inferred_type(param)
  end
  method = type.get_method(sup.name, params)
  unless method
    raise NameError, "No method %s.%s(%s)" %
    [type, sup.name, params.join(', ')]
  end
  method.call_special(self, ImplicitSelf.new, type, sup.parameters, expression)
end

#visitVarargsArray(type, parameters) ⇒ Object 



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# File 'lib/mirah/jvm/compiler/jvm_bytecode.rb', line 460

def visitVarargsArray type, parameters
  @method.push_int parameters.size
  @method.anewarray type.component_type
  parameters.each.with_index do |value, i|
    @method.dup
    @method.push_int i
    visit(value, true)
    convert_value inferred_type(value), type.component_type
    @method.aastore
  end
end