Class: SyntaxTree::YARV::DupN

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

Overview

### Summary

dupn duplicates the top n stack elements.

### Usage

~~~ruby Object::X ||= true ~~~

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Instruction

#branch_targets, #canonical, #falls_through?, #leaves?, #pops, #side_effects?

Constructor Details

#initialize(number) ⇒ DupN 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1345

def initialize(number)
  @number = number
end

Instance Attribute Details

#number ⇒ Object (readonly)

Returns the value of attribute number.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1343

def number
  @number
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1361

def ==(other)
  other.is_a?(DupN) && other.number == number
end

#call(vm) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1373

def call(vm)
  values = vm.pop(number)
  vm.push(*values)
  vm.push(*values)
end

#deconstruct_keys(_keys) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1357

def deconstruct_keys(_keys)
  { number: number }
end

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1349

def disasm(fmt)
  fmt.instruction("dupn", [fmt.object(number)])
end

#length ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1365

def length
  2
end

#pushes ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1369

def pushes
  number
end

#to_a(_iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1353

def to_a(_iseq)
  [:dupn, number]
end