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.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4949

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

Instance Attribute Details

#cache ⇒ Object (readonly)

Returns the value of attribute cache.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4947

def cache
  @cache
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4947

def name
  @name
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4969

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

#call(vm) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4982

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 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4965

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

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4954

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

#length ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4974

def length
  3
end

#pops ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4978

def pops
  1
end

#to_a(_iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4961

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