class SyntaxTree::YARV::GetInstanceVariable

### Summary

‘getinstancevariable` pushes the value of an instance variable onto the stack. It uses an inline cache to avoid having to look up the instance variable in the class hierarchy every time.

This instruction has two forms, but both have the same structure. Before Ruby 3.2, the inline cache corresponded to both the get and set instructions and could be shared. Since Ruby 3.2, it uses object shapes instead so the caches are unique per instruction.

### Usage

~~~ruby @instance_variable ~~~

Attributes

cache [R]

name [R]

Public Class Methods

new (name, cache)

Source

# File lib/syntax_tree/yarv/instructions.rb, line 1828
def initialize(name, cache)
  @name = name
  @cache = cache
end

Public Instance Methods

== (other)

Source

# File lib/syntax_tree/yarv/instructions.rb, line 1848
def ==(other)
  other.is_a?(GetInstanceVariable) && other.name == name &&
    other.cache == cache
end

call (vm)

Source

# File lib/syntax_tree/yarv/instructions.rb, line 1861
def call(vm)
  method = Object.instance_method(:instance_variable_get)
  vm.push(method.bind(vm.frame._self).call(name))
end

deconstruct_keys (_keys)

Source

# File lib/syntax_tree/yarv/instructions.rb, line 1844
def deconstruct_keys(_keys)
  { name: name, cache: cache }
end

disasm (fmt)

Source

# File lib/syntax_tree/yarv/instructions.rb, line 1833
def disasm(fmt)
  fmt.instruction(
    "getinstancevariable",
    [fmt.object(name), fmt.inline_storage(cache)]
  )
end

length ()

Source

# File lib/syntax_tree/yarv/instructions.rb, line 1853
def length
  3
end

pushes ()

Source

# File lib/syntax_tree/yarv/instructions.rb, line 1857
def pushes
  1
end

to_a (_iseq)

Source

# File lib/syntax_tree/yarv/instructions.rb, line 1840
def to_a(_iseq)
  [:getinstancevariable, name, cache]
end