Class: SyntaxTree::YARV::GetLocal

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

Overview

### Summary

getlocal fetches the value of a local variable from a frame determined by the level and index arguments. The level is the number of frames back to look and the index is the index in the local table. It pushes the value it finds onto the stack.

### Usage

~~~ruby value = 5 tap { tap { value } } ~~~

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(index, level) ⇒ GetLocal 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1720

def initialize(index, level)
  @index = index
  @level = level
end

Instance Attribute Details

#index ⇒ Object (readonly)

Returns the value of attribute index.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1718

def index
  @index
end

#level ⇒ Object (readonly)

Returns the value of attribute level.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1718

def level
  @level
end

Instance Method Details

#call(vm) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1751

def call(vm)
  vm.push(vm.local_get(index, level))
end

#canonical ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1747

def canonical
  self
end

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1725

def disasm(fmt)
  fmt.instruction("getlocal", [fmt.local(index, explicit: level)])
end

#length ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1735

def length
  3
end

#pops ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1739

def pops
  0
end

#pushes ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1743

def pushes
  1
end

#to_a(iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 1729

def to_a(iseq)
  current = iseq
  level.times { current = current.parent_iseq }
  [:getlocal, current.local_table.offset(index), level]
end