Class: SyntaxTree::YARV::SetLocal

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

Overview

### Summary

setlocal sets the value of a local variable on 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 pops the value it is setting off the stack.

### Usage

~~~ruby value = 5 tap { tap { value = 10 } } ~~~

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(index, level) ⇒ SetLocal 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4832

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 4830

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 4830

def level
  @level
end

Instance Method Details

#call(vm) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4863

def call(vm)
  vm.local_set(index, level, vm.pop)
end

#canonical ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4859

def canonical
  self
end

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4837

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

#length ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4847

def length
  3
end

#pops ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4851

def pops
  1
end

#pushes ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4855

def pushes
  0
end

#to_a(iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4841

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