Class: SyntaxTree::YARV::SetSpecial

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

Overview

### Summary

setspecial pops a value off the top of the stack and sets a special local variable to that value. The special local variable is determined by the key given as its only argument.

### Usage

~~~ruby baz if (foo == 1) .. (bar == 1) ~~~

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(key) ⇒ SetSpecial 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 5028

def initialize(key)
  @key = key
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 5026

def key
  @key
end

Instance Method Details

#call(vm) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 5056

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

#canonical ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 5052

def canonical
  self
end

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 5032

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

#length ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 5040

def length
  2
end

#pops ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 5044

def pops
  1
end

#pushes ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 5048

def pushes
  0
end

#to_a(_iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 5036

def to_a(_iseq)
  [:setspecial, key]
end