Class: Wardite::I32

Inherits:
Object
  • Object
show all
Includes:
ValueHelper
Defined in:
lib/wardite/value.rb

Constant Summary collapse

I32_MAX = 
(1<<32) - 1

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ValueHelper

#F32, #F64, #I32, #I64

Instance Attribute Details

#value ⇒ Object

value should be stored as unsigned Integer, even in I32/I64 when we want to access signed value, it’d be done via #value_s



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# File 'lib/wardite/value.rb', line 59

def value
  @value
end

Class Method Details

.from_bytes(str, size: nil, signed: false) ⇒ Object 



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# File 'lib/wardite/value.rb', line 65

def self.from_bytes(str, size: nil, signed: false)
  v = case size
    when nil
      str.unpack("I!")[0]
    when 8
      signed ? str.unpack("c")[0] : str.unpack("C")[0]
    when 16
      signed ? str.unpack("s!")[0] : str.unpack("S!")[0]
    end
  if !v.is_a?(Integer)
    raise "broken string or unsupported size: #{str.inspect} -> #{size}"
  end
  Wardite::I32(v)
end

Instance Method Details

#convert_s(to:) ⇒ Object 



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# File 'lib/wardite/value.rb', line 143

def convert_s(to:)
  case to
  when :f32
    F32(value_s.to_f)
  when :f64
    F64(value_s.to_f)
  else
    raise EvalError, "unsupported operation"
  end
end

#convert_u(to:) ⇒ Object 



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# File 'lib/wardite/value.rb', line 156

def convert_u(to:)
  case to
  when :f32
    F32(value.to_f)
  when :f64
    F64(value.to_f)
  else
    raise EvalError, "unsupported operation"
  end
end

#demote(to:) ⇒ Object

Raises:



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# File 'lib/wardite/value.rb', line 169

def demote(to:)
  raise EvalError, "unsupported operation"

end

#extend_s(to:) ⇒ Object

Raises:



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# File 'lib/wardite/value.rb', line 117

def extend_s(to:)
  raise EvalError, "unsupported operation" if to != :i64
  I64(value_s)
end

#extend_u(to:) ⇒ Object

Raises:



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# File 'lib/wardite/value.rb', line 124

def extend_u(to:)
  raise EvalError, "unsupported operation" if to != :i64
  I64(value)
end

#inspect ⇒ Object

I32#inspect shows signed value for convinience



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# File 'lib/wardite/value.rb', line 191

def inspect
  "I32(#{value_s})"
end

#memsize ⇒ Object 



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# File 'lib/wardite/value.rb', line 81

def memsize
  32
end

#packed(size: nil) ⇒ Object

TODO: eliminate use of pack, to support mruby - in this file!



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# File 'lib/wardite/value.rb', line 96

def packed(size: nil)
  case size
  when nil
    [self.value].pack("I!")
  when 8
    [self.value & 0xff].pack("C")
  when 16
    [self.value & 0xffff].pack("S!")
  else
    raise EvalError, "unsupported size #{size}"
  end
end

#promote(to:) ⇒ Object

Raises:



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# File 'lib/wardite/value.rb', line 176

def promote(to:)
  raise EvalError, "unsupported operation"

end

#reinterpret(to:) ⇒ Object

Raises:



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# File 'lib/wardite/value.rb', line 183

def reinterpret(to:)
  raise EvalError, "unsupported operation" if to != :f32
  v = [value].pack("I!").unpack("f")[0]
  raise EvalError, "[BUG] String#unpack is broke, really?" if !v.is_a?(Float)
  F32(v)
end

#trunc_s(to:) ⇒ Object

Raises:



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# File 'lib/wardite/value.rb', line 131

def trunc_s(to:)
  raise EvalError, "unsupported operation"
end

#trunc_u(to:) ⇒ Object

Raises:



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# File 'lib/wardite/value.rb', line 137

def trunc_u(to:)
  raise EvalError, "unsupported operation"
end

#value_s ⇒ Object

returns a value interpreted as signed integer



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# File 'lib/wardite/value.rb', line 87

def value_s
  (@value >> 31).zero? ?
    @value :
    ((-@value) ^ I32_MAX) + 1
end

#wrap(to:) ⇒ Object

Raises:



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# File 'lib/wardite/value.rb', line 111

def wrap(to:)
  raise EvalError, "unsupported operation"
end