Class: SyntaxTree::YARV::TopN

Inherits:

Object

• Object
• 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

• #call(vm) ⇒ Object
• #canonical ⇒ Object
• #disasm(fmt) ⇒ Object
• #initialize(number) ⇒ TopN constructor

  A new instance of TopN.

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

Constructor Details

#initialize(number) ⇒ TopN

Returns a new instance of TopN.

# File 'lib/syntax_tree/yarv/instructions.rb', line 5295

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 5293

def number
  @number
end

Instance Method Details

#call(vm) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5323

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

#canonical ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5319

def canonical
  self
end

#disasm(fmt) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5299

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

#length ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5307

def length
  2
end

#pops ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5311

def pops
  0
end

#pushes ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5315

def pushes
  1
end

#to_a(_iseq) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5303

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