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.



5055
5056
5057
5058
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5055

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

Instance Attribute Details

#index ⇒ Object (readonly)

Returns the value of attribute index.



5053
5054
5055
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5053

def index
  @index
end

#level ⇒ Object (readonly)

Returns the value of attribute level.



5053
5054
5055
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5053

def level
  @level
end

Instance Method Details

#==(other) ⇒ Object 



5074
5075
5076
5077
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5074

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

#call(vm) ⇒ Object 



5087
5088
5089
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5087

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

#deconstruct_keys(_keys) ⇒ Object 



5070
5071
5072
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5070

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

#disasm(fmt) ⇒ Object 



5060
5061
5062
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5060

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

#length ⇒ Object 



5079
5080
5081
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5079

def length
  3
end

#pops ⇒ Object 



5083
5084
5085
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5083

def pops
  1
end

#to_a(iseq) ⇒ Object 



5064
5065
5066
5067
5068
 
# File 'lib/syntax_tree/yarv/instructions.rb', line 5064

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