Class: SyntaxTree::YARV::OptNilP

Inherits:

Object

• Object
• SyntaxTree::YARV::OptNilP

Defined in:

lib/syntax_tree/yarv/instructions.rb

Overview

### Summary

opt_nil_p is an optimization applied when the method nil? is called. It returns true immediately when the receiver is nil and defers to the nil? method in other cases. It pops the receiver off the stack and pushes on the result.

### Usage

~~~ruby “”.nil? ~~~

Instance Attribute Summary

• #calldata ⇒ Object readonly

  Returns the value of attribute calldata.

Instance Method Summary

• #call(vm) ⇒ Object
• #canonical ⇒ Object
• #disasm(fmt) ⇒ Object
• #initialize(calldata) ⇒ OptNilP constructor

  A new instance of OptNilP.

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

Constructor Details

#initialize(calldata) ⇒ OptNilP

Returns a new instance of OptNilP.

# File 'lib/syntax_tree/yarv/instructions.rb', line 3642

def initialize(calldata)
  @calldata = calldata
end

Instance Attribute Details

#calldata ⇒ Object (readonly)

Returns the value of attribute calldata.

# File 'lib/syntax_tree/yarv/instructions.rb', line 3640

def calldata
  @calldata
end

Instance Method Details

#call(vm) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 3670

def call(vm)
  canonical.call(vm)
end

#canonical ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 3666

def canonical
  Send.new(calldata, nil)
end

#disasm(fmt) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 3646

def disasm(fmt)
  fmt.instruction("opt_nil_p", [fmt.calldata(calldata)])
end

#length ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 3654

def length
  2
end

#pops ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 3658

def pops
  1
end

#pushes ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 3662

def pushes
  1
end

#to_a(_iseq) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 3650

def to_a(_iseq)
  [:opt_nil_p, calldata.to_h]
end