Class: SyntaxTree::YARV::DefinedIVar

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

Overview

Summary

definedivar checks if an instance variable is defined. It is a specialization of the defined instruction. It accepts three arguments: the name of the instance variable, an inline cache, and the string that should be pushed onto the stack in the event that the instance variable is defined.

Usage

defined?(@value)

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Instruction

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

Constructor Details

#initialize(name, cache, message) ⇒ DefinedIVar

Returns a new instance of DefinedIVar.



1014
1015
1016
1017
1018
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1014

def initialize(name, cache, message)
  @name = name
  @cache = cache
  @message = message
end

Instance Attribute Details

#cache ⇒ Object (readonly)

Returns the value of attribute cache.



1012
1013
1014
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1012

def cache
  @cache
end

#message ⇒ Object (readonly)

Returns the value of attribute message.



1012
1013
1014
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1012

def message
  @message
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



1012
1013
1014
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1012

def name
  @name
end

Instance Method Details

#==(other) ⇒ Object 



1035
1036
1037
1038
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1035

def ==(other)
  other.is_a?(DefinedIVar) && other.name == name &&
    other.cache == cache && other.message == message
end

#call(vm) ⇒ Object 



1048
1049
1050
1051
1052
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1048

def call(vm)
  result = (message if vm.frame._self.instance_variable_defined?(name))

  vm.push(result)
end

#deconstruct_keys(_keys) ⇒ Object 



1031
1032
1033
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1031

def deconstruct_keys(_keys)
  { name: name, cache: cache, message: message }
end

#disasm(fmt) ⇒ Object 



1020
1021
1022
1023
1024
1025
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1020

def disasm(fmt)
  fmt.instruction(
    "definedivar",
    [fmt.object(name), fmt.inline_storage(cache), fmt.object(message)]
  )
end

#length ⇒ Object 



1040
1041
1042
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1040

def length
  4
end

#pushes ⇒ Object 



1044
1045
1046
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1044

def pushes
  1
end

#to_a(_iseq) ⇒ Object 



1027
1028
1029
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1027

def to_a(_iseq)
  [:definedivar, name, cache, message]
end