Class: SyntaxTree::YARV::CheckKeyword

Inherits:
Instruction show all
Defined in:
lib/syntax_tree/yarv/instructions.rb

Overview

Summary

checkkeyword checks if a keyword was passed at the callsite that called into the method represented by the instruction sequence. It has two arguments: the index of the local variable that stores the keywords metadata and the index of the keyword within that metadata. It pushes a boolean onto the stack indicating whether or not the keyword was given.

Usage

def evaluate(value: rand)
  value
end

evaluate(value: 3)

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Instruction

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

Constructor Details

#initialize(keyword_bits_index, keyword_index) ⇒ CheckKeyword

Returns a new instance of CheckKeyword.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 362

def initialize(keyword_bits_index, keyword_index)
  @keyword_bits_index = keyword_bits_index
  @keyword_index = keyword_index
end

Instance Attribute Details

#keyword_bits_index ⇒ Object (readonly)

Returns the value of attribute keyword_bits_index.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 360

def keyword_bits_index
  @keyword_bits_index
end

#keyword_index ⇒ Object (readonly)

Returns the value of attribute keyword_index.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 360

def keyword_index
  @keyword_index
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 386

def ==(other)
  other.is_a?(CheckKeyword) &&
    other.keyword_bits_index == keyword_bits_index &&
    other.keyword_index == keyword_index
end

#call(vm) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 400

def call(vm)
  vm.push(vm.local_get(keyword_bits_index, 0)[keyword_index])
end

#deconstruct_keys(_keys) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 382

def deconstruct_keys(_keys)
  { keyword_bits_index: keyword_bits_index, keyword_index: keyword_index }
end

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 367

def disasm(fmt)
  fmt.instruction(
    "checkkeyword",
    [fmt.object(keyword_bits_index), fmt.object(keyword_index)]
  )
end

#length ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 392

def length
  3
end

#pushes ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 396

def pushes
  1
end

#to_a(iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 374

def to_a(iseq)
  [
    :checkkeyword,
    iseq.local_table.offset(keyword_bits_index),
    keyword_index
  ]
end