Class: SyntaxTree::YARV::DupN

Inherits:

Instruction

• Object
• Instruction
• SyntaxTree::YARV::DupN

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

• #number ⇒ Object readonly

  Returns the value of attribute number.

Instance Method Summary

• #==(other) ⇒ Object
• #call(vm) ⇒ Object
• #deconstruct_keys(_keys) ⇒ Object
• #disasm(fmt) ⇒ Object
• #initialize(number) ⇒ DupN constructor

  A new instance of DupN.

• #length ⇒ Object
• #pushes ⇒ Object
• #to_a(_iseq) ⇒ Object

Methods inherited from Instruction

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

Constructor Details

#initialize(number) ⇒ DupN

Returns a new instance of DupN.

# File 'lib/syntax_tree/yarv/instructions.rb', line 1398

def initialize(number)
  @number = number
end

Instance Attribute Details

#number ⇒ Object (readonly)

Returns the value of attribute number.

# File 'lib/syntax_tree/yarv/instructions.rb', line 1396

def number
  @number
end

Instance Method Details

#==(other) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1414

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

#call(vm) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1426

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

#deconstruct_keys(_keys) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1410

def deconstruct_keys(_keys)
  { number: number }
end

#disasm(fmt) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1402

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

#length ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1418

def length
  2
end

#pushes ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1422

def pushes
  number
end

#to_a(_iseq) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1406

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