Class: SyntaxTree::YARV::SetBlockParam

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

Overview

### Summary

setblockparam sets the value of a block 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 def foo(&bar)

bar = baz

end ~~~

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(index, level) ⇒ SetBlockParam 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4570

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 4568

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 4568

def level
  @level
end

Instance Method Details

#call(vm) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4601

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 4597

def canonical
  self
end

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4575

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

#length ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4585

def length
  3
end

#pops ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4589

def pops
  1
end

#pushes ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4593

def pushes
  0
end

#to_a(iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4579

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