Class: SyntaxTree::YARV::SetBlockParam

Inherits:
Instruction 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

Methods inherited from Instruction

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

Constructor Details

#initialize(index, level) ⇒ SetBlockParam

Returns a new instance of SetBlockParam.



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4954

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 4952

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 4952

def level
  @level
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4973

def ==(other)
  other.is_a?(SetBlockParam) && other.index == index &&
    other.level == level
end

#call(vm) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4986

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

#deconstruct_keys(_keys) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4969

def deconstruct_keys(_keys)
  { index: index, level: level }
end

#disasm(fmt) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4959

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 4978

def length
  3
end

#pops ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4982

def pops
  1
end

#to_a(iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instructions.rb', line 4963

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