Class: SyntaxTree::YARV::GetConstant

Inherits:
Object
  • Object
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

Constructor Details

#initialize(name) ⇒ GetConstant 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1548

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 1546

def name
  @name
end

Instance Method Details

#call(vm) ⇒ Object

Raises:

  • (NameError) 


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# File 'lib/syntax_tree/yarv/instructions.rb', line 1576

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

#canonical ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1572

def canonical
  self
end

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1552

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

#length ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1560

def length
  2
end

#pops ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1564

def pops
  2
end

#pushes ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1568

def pushes
  1
end

#to_a(_iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1556

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