Class: SyntaxTree::YARV::Dup

Inherits:

Instruction

• Object
• Instruction
• SyntaxTree::YARV::Dup

Defined in:

lib/syntax_tree/yarv/instructions.rb

Overview

### Summary

‘dup` copies the top value of the stack and pushes it onto the stack.

### Usage

~~~ruby $global = 5 ~~~

Instance Method Summary

• #==(other) ⇒ Object
• #call(vm) ⇒ Object
• #deconstruct_keys(_keys) ⇒ Object
• #disasm(fmt) ⇒ Object
• #pops ⇒ Object
• #pushes ⇒ Object
• #side_effects? ⇒ Boolean
• #to_a(_iseq) ⇒ Object

Methods inherited from Instruction

#branch_targets, #canonical, #falls_through?, #leaves?, #length

Instance Method Details

#==(other) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1219

def ==(other)
  other.is_a?(Dup)
end

#call(vm) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1231

def call(vm)
  vm.push(vm.stack.last.dup)
end

#deconstruct_keys(_keys) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1215

def deconstruct_keys(_keys)
  {}
end

#disasm(fmt) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1207

def disasm(fmt)
  fmt.instruction("dup")
end

#pops ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1223

def pops
  1
end

#pushes ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1227

def pushes
  2
end

#side_effects? ⇒ Boolean

Returns:

• (Boolean)

# File 'lib/syntax_tree/yarv/instructions.rb', line 1235

def side_effects?
  false
end

#to_a(_iseq) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1211

def to_a(_iseq)
  [:dup]
end