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 



198
199
200
 
# 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.



196
197
198
 
# File 'lib/syntax_tree/yarv/legacy.rb', line 196

def name
  @name
end

Instance Method Details

#==(other) ⇒ Object 



214
215
216
 
# File 'lib/syntax_tree/yarv/legacy.rb', line 214

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

#call(vm) ⇒ Object 



230
231
232
 
# File 'lib/syntax_tree/yarv/legacy.rb', line 230

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

#canonical ⇒ Object 



226
227
228
 
# File 'lib/syntax_tree/yarv/legacy.rb', line 226

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

#deconstruct_keys(_keys) ⇒ Object 



210
211
212
 
# File 'lib/syntax_tree/yarv/legacy.rb', line 210

def deconstruct_keys(_keys)
  { name: name }
end

#disasm(fmt) ⇒ Object 



202
203
204
 
# File 'lib/syntax_tree/yarv/legacy.rb', line 202

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

#length ⇒ Object 



218
219
220
 
# File 'lib/syntax_tree/yarv/legacy.rb', line 218

def length
  2
end

#pops ⇒ Object 



222
223
224
 
# File 'lib/syntax_tree/yarv/legacy.rb', line 222

def pops
  1
end

#to_a(_iseq) ⇒ Object 



206
207
208
 
# File 'lib/syntax_tree/yarv/legacy.rb', line 206

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