Class: SyntaxTree::YARV::SetSpecial

Inherits:

Instruction

• Object
• Instruction
• SyntaxTree::YARV::SetSpecial

Defined in:

lib/syntax_tree/yarv/instructions.rb

Overview

### Summary

‘setspecial` pops a value off the top of the stack and sets a special local variable to that value. The special local variable is determined by the key given as its only argument.

### Usage

~~~ruby baz if (foo == 1) .. (bar == 1) ~~~

Instance Attribute Summary

• #key ⇒ Object readonly

  Returns the value of attribute key.

Instance Method Summary

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

  A new instance of SetSpecial.

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

Methods inherited from Instruction

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

Constructor Details

#initialize(key) ⇒ SetSpecial

Returns a new instance of SetSpecial.

# File 'lib/syntax_tree/yarv/instructions.rb', line 5381

def initialize(key)
  @key = key
end

Instance Attribute Details

#key ⇒ Object (readonly)

Returns the value of attribute key.

# File 'lib/syntax_tree/yarv/instructions.rb', line 5379

def key
  @key
end

Instance Method Details

#==(other) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5397

def ==(other)
  other.is_a?(SetSpecial) && other.key == key
end

#call(vm) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5409

def call(vm)
  case key
  when GetSpecial::SVAR_LASTLINE
    raise NotImplementedError, "setspecial SVAR_LASTLINE"
  when GetSpecial::SVAR_BACKREF
    raise NotImplementedError, "setspecial SVAR_BACKREF"
  when GetSpecial::SVAR_FLIPFLOP_START
    vm.frame_svar.svars[GetSpecial::SVAR_FLIPFLOP_START]
  end
end

#deconstruct_keys(_keys) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5393

def deconstruct_keys(_keys)
  { key: key }
end

#disasm(fmt) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5385

def disasm(fmt)
  fmt.instruction("setspecial", [fmt.object(key)])
end

#length ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5401

def length
  2
end

#pops ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5405

def pops
  1
end

#to_a(_iseq) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 5389

def to_a(_iseq)
  [:setspecial, key]
end