Class: SyntaxTree::YARV::TopN

Inherits:

Instruction

• Object
• Instruction
• SyntaxTree::YARV::TopN

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

~~~ruby case 3 when 1..5

puts "foo"

end ~~~

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) ⇒ TopN constructor

  A new instance of TopN.

• #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) ⇒ TopN

Returns a new instance of TopN.

# 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.

# File 'lib/syntax_tree/yarv/instructions.rb', line 5700

def number
  @number
end

Instance Method Details

#==(other) ⇒ Object

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

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

#call(vm) ⇒ Object

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

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

#deconstruct_keys(_keys) ⇒ Object

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

def deconstruct_keys(_keys)
  { number: number }
end

#disasm(fmt) ⇒ Object

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

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

#length ⇒ Object

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

def length
  2
end

#pushes ⇒ Object

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

def pushes
  1
end

#to_a(_iseq) ⇒ Object

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

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