Class: SyntaxTree::YARV::Swap

Inherits:

Instruction

• Object
• Instruction
• SyntaxTree::YARV::Swap

Defined in:

lib/syntax_tree/yarv/instructions.rb

Overview

Summary

swap swaps the top two elements in the stack.

TracePoint

swap does not dispatch any events.

Usage

!!defined?([[]])

Instance Method Summary

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

Methods inherited from Instruction

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

Instance Method Details

#==(other) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5667

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

#call(vm) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5679

def call(vm)
  left, right = vm.pop(2)
  vm.push(right, left)
end

#deconstruct_keys(_keys) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5663

def deconstruct_keys(_keys)
  {}
end

#disasm(fmt) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5655

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

#pops ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5671

def pops
  2
end

#pushes ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5675

def pushes
  2
end

#to_a(_iseq) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5659

def to_a(_iseq)
  [:swap]
end