Class: SyntaxTree::YARV::SetClassVariable

Inherits:
Instruction
  • Object
show all
Defined in:
lib/syntax_tree/yarv/instructions.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. It uses an inline cache to reduce the need to lookup the class variable in the class hierarchy every time.

### Usage

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Instruction

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

Constructor Details

#initialize(name, cache) ⇒ SetClassVariable

Returns a new instance of SetClassVariable.



5007
5008
5009
5010
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5007

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

Instance Attribute Details

#cache ⇒ Object (readonly)

Returns the value of attribute cache.



5005
5006
5007
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5005

def cache
  @cache
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



5005
5006
5007
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5005

def name
  @name
end

Instance Method Details

#==(other) ⇒ Object 



5027
5028
5029
5030
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5027

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

#call(vm) ⇒ Object 



5040
5041
5042
5043
5044
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5040

def call(vm)
  clazz = vm.frame._self
  clazz = clazz.class unless clazz.is_a?(Class)
  clazz.class_variable_set(name, vm.pop)
end

#deconstruct_keys(_keys) ⇒ Object 



5023
5024
5025
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5023

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

#disasm(fmt) ⇒ Object 



5012
5013
5014
5015
5016
5017
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5012

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

#length ⇒ Object 



5032
5033
5034
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5032

def length
  3
end

#pops ⇒ Object 



5036
5037
5038
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5036

def pops
  1
end

#to_a(_iseq) ⇒ Object 



5019
5020
5021
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5019

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