Class: SyntaxTree::YARV::GetSpecial

Inherits:
Object
  • Object
show all
Defined in:
lib/syntax_tree/yarv/instructions.rb

Overview

### Summary

getspecial pushes the value of a special local variable onto the stack.

### Usage

~~~ruby 1 if (a == 1) .. (b == 2) ~~~

Constant Summary collapse

SVAR_LASTLINE =

$_

0
SVAR_BACKREF =

$~

1
SVAR_FLIPFLOP_START =

flipflop

2

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(key, type) ⇒ GetSpecial

Returns a new instance of GetSpecial.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1871

def initialize(key, type)
  @key = key
  @type = type
end

Instance Attribute Details

#key ⇒ Object (readonly)

Returns the value of attribute key.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1869

def key
  @key
end

#type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1869

def type
  @type
end

Instance Method Details

#call(vm) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1900

def call(vm)
  case key
  when SVAR_LASTLINE
    raise NotImplementedError, "getspecial SVAR_LASTLINE"
  when SVAR_BACKREF
    raise NotImplementedError, "getspecial SVAR_BACKREF"
  when SVAR_FLIPFLOP_START
    vm.frame_svar.svars[SVAR_FLIPFLOP_START]
  end
end

#canonical ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1896

def canonical
  self
end

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1876

def disasm(fmt)
  fmt.instruction("getspecial", [fmt.object(key), fmt.object(type)])
end

#length ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1884

def length
  3
end

#pops ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1888

def pops
  0
end

#pushes ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1892

def pushes
  1
end

#to_a(_iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1880

def to_a(_iseq)
  [:getspecial, key, type]
end