Class: Wardite::Op

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

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(namespace, code, operand) ⇒ Op

Returns a new instance of Op.



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# File 'lib/wardite/instruction.rb', line 15

def initialize(namespace, code, operand)
  @namespace = namespace      
  @code = code
  @operand = operand
end

Instance Attribute Details

#code ⇒ Object

: Symbol



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# File 'lib/wardite/instruction.rb', line 7

def code
  @code
end

#namespace ⇒ Object

: Symbol



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# File 'lib/wardite/instruction.rb', line 5

def namespace
  @namespace
end

#operand ⇒ Object

TODO: add types of potential operands



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# File 'lib/wardite/instruction.rb', line 10

def operand
  @operand
end

Class Method Details

.i2type(code) ⇒ Object

See Also:



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# File 'lib/wardite/instruction.rb', line 86

def self.i2type(code)
  case code
  when 0x7f
    :i32
  when 0x7e
    :i64
  when 0x7d
    :f32
  when 0x7c
    :f64
  else
    raise "unknown type code #{code}"
  end
end

.operand_of(code) ⇒ Object 



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# File 'lib/wardite/instruction.rb', line 68

def self.operand_of(code)
  case code
  when :local_get, :local_set, :call
    [:u32]
  when :i32_const
    [:i32]
  when :i32_store
    [:u32, :u32]
  when :if
    [:u8_block]
  else
    []
  end
end

.to_sym(chr) ⇒ Object 



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# File 'lib/wardite/instruction.rb', line 23

def self.to_sym(chr)
  code = case chr
    when "\u0004"
      :if
    when "\u000b"
      :end
    when "\u000f"
      :return
    when "\u0010"
      :call
    when "\u0020"
      :local_get
    when "\u0021"
      :local_set
    when "\u0036"
      :i32_store
    when "\u0041"
      :i32_const
    when "\u0048"
      :i32_lts
    when "\u004d"
      :i32_leu
    when "\u006a"
      :i32_add
    when "\u006b"
      :i32_sub
    else
      raise NotImplementedError, "unimplemented: #{"%04x" % chr.ord}"
    end
  # opcodes equal to or larger than are "convert" ops
  if chr.ord >= 0xa7
    return [:convert, code]
  end

  prefix = code.to_s.split("_")[0]
  case prefix
  when "i32", "i64", "f32", "f64"
    [prefix.to_sym, code]
  else
    [:default, code]
  end
end