Class: SyntaxTree::YARV::GetInstanceVariable

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

Overview

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

</code>

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) ⇒ GetInstanceVariable

Returns a new instance of GetInstanceVariable.



1828
1829
1830
1831
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1828

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

Instance Attribute Details

#cache ⇒ Object (readonly)

Returns the value of attribute cache.



1826
1827
1828
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1826

def cache
  @cache
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



1826
1827
1828
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1826

def name
  @name
end

Instance Method Details

#==(other) ⇒ Object 



1848
1849
1850
1851
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1848

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

#call(vm) ⇒ Object 



1861
1862
1863
1864
 
# 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) ⇒ Object 



1844
1845
1846
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1844

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

#disasm(fmt) ⇒ Object 



1833
1834
1835
1836
1837
1838
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1833

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

#length ⇒ Object 



1853
1854
1855
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1853

def length
  3
end

#pushes ⇒ Object 



1857
1858
1859
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1857

def pushes
  1
end

#to_a(_iseq) ⇒ Object 



1840
1841
1842
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 1840

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