Class: SyntaxTree::YARV::GetClassVariable

Inherits:
Instruction
  • Object
show all
Defined in:
lib/syntax_tree/yarv/instructions.rb

Overview

### Summary

‘getclassvariable` looks for a class variable in the current class and pushes its value onto 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 ~~~

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Instruction

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

Constructor Details

#initialize(name, cache) ⇒ GetClassVariable

Returns a new instance of GetClassVariable.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1599

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 1597

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 1597

def name
  @name
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1619

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

#call(vm) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1632

def call(vm)
  clazz = vm.frame._self
  clazz = clazz.class unless clazz.is_a?(Class)
  vm.push(clazz.class_variable_get(name))
end

#deconstruct_keys(_keys) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1615

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

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1604

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

#length ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1624

def length
  3
end

#pushes ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1628

def pushes
  1
end

#to_a(_iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1611

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