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 198

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 196

def name
  @name
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/syntax_tree/yarv/legacy.rb', line 214

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 230

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

#canonical ⇒ Object 



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# File 'lib/syntax_tree/yarv/legacy.rb', line 226

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

#deconstruct_keys(_keys) ⇒ Object 



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# File 'lib/syntax_tree/yarv/legacy.rb', line 210

def deconstruct_keys(_keys)
  { name: name }
end

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/legacy.rb', line 202

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

#length ⇒ Object 



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# File 'lib/syntax_tree/yarv/legacy.rb', line 218

def length
  2
end

#pops ⇒ Object 



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# File 'lib/syntax_tree/yarv/legacy.rb', line 222

def pops
  1
end

#to_a(_iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/legacy.rb', line 206

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