Class: SyntaxTree::YARV::TopN

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

Overview

Summary

topn pushes a single value onto the stack that is a copy of the value within the stack that is number of slots down from the top.

Usage

case 3
when 1..5
  puts "foo"
end

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) ⇒ TopN

Returns a new instance of TopN.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 5702

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 5700

def number
  @number
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 5718

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

#call(vm) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 5730

def call(vm)
  vm.push(vm.stack[-number - 1])
end

#deconstruct_keys(_keys) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 5714

def deconstruct_keys(_keys)
  { number: number }
end

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 5706

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

#length ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 5722

def length
  2
end

#pushes ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 5726

def pushes
  1
end

#to_a(_iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 5710

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