Class: SyntaxTree::YARV::SetGlobal

Inherits:

Instruction

• Object
• Instruction
• SyntaxTree::YARV::SetGlobal

Defined in:

lib/syntax_tree/yarv/instructions.rb

Overview

### Summary

‘setglobal` sets the value of a global variable to a value popped off the top of the stack.

### Usage

~~~ruby $global = 5 ~~~

Instance Attribute Summary

• #name ⇒ Object readonly

  Returns the value of attribute name.

Instance Method Summary

• #==(other) ⇒ Object
• #call(vm) ⇒ Object
• #deconstruct_keys(_keys) ⇒ Object
• #disasm(fmt) ⇒ Object
• #initialize(name) ⇒ SetGlobal constructor

  A new instance of SetGlobal.

• #length ⇒ Object
• #pops ⇒ Object
• #to_a(_iseq) ⇒ Object

Methods inherited from Instruction

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

Constructor Details

#initialize(name) ⇒ SetGlobal

Returns a new instance of SetGlobal.

# File 'lib/syntax_tree/yarv/instructions.rb', line 5210

def initialize(name)
  @name = name
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.

# File 'lib/syntax_tree/yarv/instructions.rb', line 5208

def name
  @name
end

Instance Method Details

#==(other) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5226

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

#call(vm) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5238

def call(vm)
  # Evaluating the name of the global variable because there isn't a
  # reflection API for global variables.
  eval("#{name} = vm.pop", binding, __FILE__, __LINE__)
end

#deconstruct_keys(_keys) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5222

def deconstruct_keys(_keys)
  { name: name }
end

#disasm(fmt) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5214

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

#length ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5230

def length
  2
end

#pops ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5234

def pops
  1
end

#to_a(_iseq) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5218

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