Class: SyntaxTree::YARV::GetConstant

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

Overview

### Summary

‘getconstant` performs a constant lookup and pushes the value of the constant onto the stack. It pops both the class it should look in and whether or not it should look globally as well.

### Usage

~~~ruby Constant ~~~

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Instruction

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

Constructor Details

#initialize(name) ⇒ GetConstant

Returns a new instance of GetConstant.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1654

def initialize(name)
  @name = name
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1652

def name
  @name
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1670

def ==(other)
  other.is_a?(GetConstant) && other.name == name
end

#call(vm) ⇒ Object

Raises:

  • (NameError) 


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# File 'lib/syntax_tree/yarv/instructions.rb', line 1686

def call(vm)
  const_base, allow_nil = vm.pop(2)

  if const_base
    if const_base.const_defined?(name)
      vm.push(const_base.const_get(name))
      return
    end
  elsif const_base.nil? && allow_nil
    vm.frame.nesting.reverse_each do |clazz|
      if clazz.const_defined?(name)
        vm.push(clazz.const_get(name))
        return
      end
    end
  end

  raise NameError, "uninitialized constant #{name}"
end

#deconstruct_keys(_keys) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1666

def deconstruct_keys(_keys)
  { name: name }
end

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1658

def disasm(fmt)
  fmt.instruction("getconstant", [fmt.object(name)])
end

#length ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1674

def length
  2
end

#pops ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1678

def pops
  2
end

#pushes ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1682

def pushes
  1
end

#to_a(_iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1662

def to_a(_iseq)
  [:getconstant, name]
end