Class: SyntaxTree::YARV::Legacy::SetClassVariable

Inherits:
Instruction
  • Object
show all
Defined in:
lib/syntax_tree/yarv/legacy.rb

Overview

### Summary

setclassvariable looks for a class variable in the current class and sets its value to the value it pops off the top of the stack.

This version of the setclassvariable instruction is no longer used since in Ruby 3.0 it gained an inline cache.

### Usage

~~~ruby @@class_variable = 1 ~~~

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Instruction

#branch_targets, #falls_through?, #leaves?, #pushes, #side_effects?

Constructor Details

#initialize(name) ⇒ SetClassVariable

Returns a new instance of SetClassVariable.



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# File 'lib/syntax_tree/yarv/legacy.rb', line 302

def initialize(name)
  @name = name
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/syntax_tree/yarv/legacy.rb', line 300

def name
  @name
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/syntax_tree/yarv/legacy.rb', line 318

def ==(other)
  other.is_a?(SetClassVariable) && other.name == name
end

#call(vm) ⇒ Object 



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# File 'lib/syntax_tree/yarv/legacy.rb', line 334

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

#canonical ⇒ Object 



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# File 'lib/syntax_tree/yarv/legacy.rb', line 330

def canonical
  YARV::SetClassVariable.new(name, nil)
end

#deconstruct_keys(_keys) ⇒ Object 



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# File 'lib/syntax_tree/yarv/legacy.rb', line 314

def deconstruct_keys(_keys)
  { name: name }
end

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/legacy.rb', line 306

def disasm(fmt)
  fmt.instruction("setclassvariable", [fmt.object(name)])
end

#length ⇒ Object 



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# File 'lib/syntax_tree/yarv/legacy.rb', line 322

def length
  2
end

#pops ⇒ Object 



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# File 'lib/syntax_tree/yarv/legacy.rb', line 326

def pops
  1
end

#to_a(_iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/legacy.rb', line 310

def to_a(_iseq)
  [:setclassvariable, name]
end