Class: SyntaxTree::YARV::GetClassVariable

Inherits:
Object
  • 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

Constructor Details

#initialize(name, cache) ⇒ GetClassVariable

Returns a new instance of GetClassVariable.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1671

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 1669

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 1669

def name
  @name
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1691

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 1712

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

#canonical ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1708

def canonical
  self
end

#deconstruct_keys(_keys) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1687

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

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1676

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 1696

def length
  3
end

#pops ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1700

def pops
  0
end

#pushes ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1704

def pushes
  1
end

#to_a(_iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1683

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