Class: SyntaxTree::YARV::OptLength

Inherits:

Object

• Object
• SyntaxTree::YARV::OptLength

Defined in:

lib/syntax_tree/yarv/instructions.rb

Overview

### Summary

opt_length is a specialization of opt_send_without_block, when the length method is called. There are fast paths when the receiver is either a string, hash, or array. It pops the receiver off the stack and pushes on the result of the method call.

### Usage

~~~ruby “”.length ~~~

Instance Attribute Summary

• #calldata ⇒ Object readonly

  Returns the value of attribute calldata.

Instance Method Summary

• #call(vm) ⇒ Object
• #canonical ⇒ Object
• #disasm(fmt) ⇒ Object
• #initialize(calldata) ⇒ OptLength constructor

  A new instance of OptLength.

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

Constructor Details

#initialize(calldata) ⇒ OptLength

# File 'lib/syntax_tree/yarv/instructions.rb', line 3195

def initialize(calldata)
  @calldata = calldata
end

Instance Attribute Details

#calldata ⇒ Object (readonly)

Returns the value of attribute calldata.

# File 'lib/syntax_tree/yarv/instructions.rb', line 3193

def calldata
  @calldata
end

Instance Method Details

#call(vm) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 3223

def call(vm)
  canonical.call(vm)
end

#canonical ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 3219

def canonical
  Send.new(calldata, nil)
end

#disasm(fmt) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 3199

def disasm(fmt)
  fmt.instruction("opt_length", [fmt.calldata(calldata)])
end

#length ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 3207

def length
  2
end

#pops ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 3211

def pops
  1
end

#pushes ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 3215

def pushes
  1
end

#to_a(_iseq) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 3203

def to_a(_iseq)
  [:opt_length, calldata.to_h]
end