Class: CastOff::Compiler::SimpleIR::JumpIR

Inherits:
IR
  • Object
show all
Defined in:
lib/cast_off/compile/ir/jump_ir.rb

Instance Attribute Summary collapse

Attributes inherited from IR

#alias, #insn

Instance Method Summary collapse

Methods inherited from IR

#add_sampling_variable, #alive, #alive?, #dispatch_method?, #generate_guard, #get_definition, #get_definition_str, #get_usage, #get_variable, #inlining_target?, #propergate_guard_usage, #reset, #sampling_variable, #set_info, #standard_guard_target, #vanish, #vanish?

Methods included from Util

#bug, #dlog, #todo, #vlog

Constructor Details

#initialize(val, insn, cfg) ⇒ JumpIR

Returns a new instance of JumpIR.



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# File 'lib/cast_off/compile/ir/jump_ir.rb', line 8

def initialize(val, insn, cfg)
  super(insn, cfg)

  @cond_value = val
  @jump_type = insn.op
  argv = insn.argv
  case @jump_type
  when :jump, :branchif, :branchunless, :cast_off_enter_block, :cast_off_leave_block, :cast_off_continue_loop
    @jump_targets = [argv[0]]
    @must = nil
    @post = nil
  when :cast_off_break_block
    @jump_targets = [argv[0]]
    @raw_state = argv[1]
    bug() unless @raw_state
    @exc_pc = argv[2]
    bug() unless @exc_pc >= 0
    @must = nil
    @post = nil
  when :cast_off_handle_optional_args
    @jump_targets = argv[0]
    @must = argv[1]
    @post = argv[2]
  else
    bug()
  end
  bug() unless @jump_targets.is_a?(Array)
  @values = @cond_value ? [@cond_value] : []
  @variables = []
  @variables_without_result = []
  if @cond_value.is_a?(Variable)
    @variables << @cond_value
    @variables_without_result << @cond_value
  end
  @result_variable = nil
end

Instance Attribute Details

#cond_value ⇒ Object (readonly)

Returns the value of attribute cond_value.



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# File 'lib/cast_off/compile/ir/jump_ir.rb', line 6

def cond_value
  @cond_value
end

#jump_targets ⇒ Object (readonly)

Returns the value of attribute jump_targets.



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# File 'lib/cast_off/compile/ir/jump_ir.rb', line 6

def jump_targets
  @jump_targets
end

#jump_type ⇒ Object (readonly)

Returns the value of attribute jump_type.



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# File 'lib/cast_off/compile/ir/jump_ir.rb', line 6

def jump_type
  @jump_type
end

#result_variable ⇒ Object (readonly)

Returns the value of attribute result_variable.



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# File 'lib/cast_off/compile/ir/jump_ir.rb', line 6

def result_variable
  @result_variable
end

#values ⇒ Object (readonly)

Returns the value of attribute values.



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# File 'lib/cast_off/compile/ir/jump_ir.rb', line 6

def values
  @values
end

#variables ⇒ Object (readonly)

Returns the value of attribute variables.



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# File 'lib/cast_off/compile/ir/jump_ir.rb', line 6

def variables
  @variables
end

#variables_without_result ⇒ Object (readonly)

Returns the value of attribute variables_without_result.



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# File 'lib/cast_off/compile/ir/jump_ir.rb', line 6

def variables_without_result
  @variables_without_result
end

Instance Method Details

#mark(defs) ⇒ Object 



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# File 'lib/cast_off/compile/ir/jump_ir.rb', line 199

def mark(defs)
  if !alive?
    alive()
    defs.mark(@cond_value) if @cond_value
    true
  else
    false
  end
end

#propergate_boxed_value(defs) ⇒ Object 



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# File 'lib/cast_off/compile/ir/jump_ir.rb', line 50

def propergate_boxed_value(defs)
  return false unless @cond_value
  bug() unless @cond_value.boxed?
  defs.propergate_boxed_value_backward(@cond_value)
end

#propergate_exact_class(defs) ⇒ Object

unboxing end ###



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# File 'lib/cast_off/compile/ir/jump_ir.rb', line 57

def propergate_exact_class(defs)
  @cond_value ? defs.exact_class_resolve(@cond_value) : false
end

#to_c ⇒ Object 



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# File 'lib/cast_off/compile/ir/jump_ir.rb', line 65

def to_c()
  ret = []
  # FIXME detect backedge
  # FIXME add interrupt check when ehable intterupt check option
  s = sampling_variable()
  ret << s if s
  case @jump_type
  when :cast_off_enter_block
    if @translator.inline_block?
      bug() unless @jump_targets.size() == 1
      ret << "  goto #{@jump_targets[0]};"
    end
  when :cast_off_leave_block
    if @translator.inline_block?
      bug() unless @jump_targets.size() == 1
      ret << "  goto #{@jump_targets[0]};"
    else
      ret << "  return tmp#{@insn.iseq.depth};" # FIXME
    end
  when :cast_off_break_block
    if @translator.inline_block?
      bug() unless @jump_targets.size() == 1
      ret << "  goto #{@jump_targets[0]};"
    else
      ret << "  break_block(#{@raw_state}, #{@exc_pc}, tmp#{@insn.iseq.depth});" # FIXME
    end
  when :cast_off_continue_loop
    if @translator.inline_block?
      bug() unless @jump_targets.size() == 1
      ret << "  if (RTEST(#{@cond_value})) goto #{@jump_targets[0]};"
    end
  when :jump
    bug() unless @jump_targets.size() == 1
    #ret << "  RUBY_VM_CHECK_INTS();"
    ret << "  goto #{@jump_targets[0]};"
  when :branchunless
    bug() unless @jump_targets.size() == 1
    ret << "  if (!RTEST(#{@cond_value})) goto #{@jump_targets[0]};"
=begin
      ret << <<-EOS
  if (!RTEST(#{@cond_value})) {
    RUBY_VM_CHECK_INTS();
    goto #{@jump_targets[0]};
  }
      EOS
=end
    when :branchif
      bug() unless @jump_targets.size() == 1
      ret << "  if (RTEST(#{@cond_value})) goto #{@jump_targets[0]};"
=begin
      ret << <<-EOS
  if (RTEST(#{@cond_value})) {
    RUBY_VM_CHECK_INTS();
    goto #{@jump_targets[0]};
  }
      EOS
=end
  when :cast_off_handle_optional_args
    bug() unless @jump_targets.size() > 1
    bug() unless @cond_value.is_just?(Fixnum)
    ret << "  switch(#{@cond_value}) {"
    @jump_targets.each_with_index do |t, i|
      ret << "    case(INT2FIX(#{i + @must})): goto #{t};"
    end
    if @post
      ret << <<-EOS
    default: {
int num = FIX2INT(#{@cond_value});
if (num >= #{@jump_targets.size() + @must}) {
  goto #{@jump_targets.last};
} else {
  rb_bug("should not be reached");
}
    }
      EOS
    else
      ret << "    default: rb_bug(\"should not be reached\");"
    end
    ret << "  }"
  else
    bug("unexpected jump type #{@jump_type}")
  end
  ret.join("\n")
end

#to_debug_string ⇒ Object 



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# File 'lib/cast_off/compile/ir/jump_ir.rb', line 61

def to_debug_string()
  "Jump(#{@jump_type}#{@cond_value ? " : #{@cond_value.to_debug_string()}" : ''}) => #{@jump_targets}"
end

#type_propergation(defs) ⇒ Object 



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# File 'lib/cast_off/compile/ir/jump_ir.rb', line 150

def type_propergation(defs)
  @cond_value ? defs.type_resolve(@cond_value) : false
end

#unboxing_prelude ⇒ Object

unboxing begin ###



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# File 'lib/cast_off/compile/ir/jump_ir.rb', line 46

def unboxing_prelude()
  @cond_value.box() if @cond_value
end

#unused_target ⇒ Object 



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# File 'lib/cast_off/compile/ir/jump_ir.rb', line 154

def unused_target()
  case @jump_type
  when :jump
    bug()
  when :cast_off_handle_optional_args, :cast_off_enter_block, :cast_off_leave_block, :cast_off_continue_loop, \
       :cast_off_break_block
    # nothing to do
    return nil
  when :branchif, :branchunless
    bug() if @cond_value.undefined?
    return nil if @cond_value.dynamic?
    nil_wrapper = ClassWrapper.new(NilClass, true)
    false_wrapper = ClassWrapper.new(FalseClass, true)
    classes = @cond_value.types
    bug() if classes.empty?
    constant = true
    bool = nil
    classes.each do |c|
      if c == nil_wrapper || c == false_wrapper
        __bool = false
      else
        __bool = true
      end
      if bool.nil?
        bool = __bool
      else
        unless bool == __bool
          constant = false
          break
        end
      end
    end
    if constant
      bug() if bool.nil?
      fallthrough = (bool && @jump_type == :branchunless) || (!bool && @jump_type == :branchif)
      bug() if @jump_targets.size() != 1
      target = @jump_targets[0]
      return fallthrough ? target : :fallthrough
    else
      return nil
    end
  end
  bug()
end