Class: SyntaxTree::YARV::GetBlockParam

Inherits:

Instruction

• Object
• Instruction
• SyntaxTree::YARV::GetBlockParam

Defined in:

lib/syntax_tree/yarv/instructions.rb

Overview

### Summary

‘getblockparam` is a similar instruction to `getlocal` in that it looks for a local variable in the current instruction sequence’s local table and walks recursively up the parent instruction sequences until it finds it. The local it retrieves, however, is a special block local that was passed to the current method. It pushes the value of the block local onto the stack.

### Usage

~~~ruby def foo(&block)

block

end ~~~

Instance Attribute Summary

• #index ⇒ Object readonly

  Returns the value of attribute index.

• #level ⇒ Object readonly

  Returns the value of attribute level.

Instance Method Summary

• #==(other) ⇒ Object
• #call(vm) ⇒ Object
• #deconstruct_keys(_keys) ⇒ Object
• #disasm(fmt) ⇒ Object
• #initialize(index, level) ⇒ GetBlockParam constructor

  A new instance of GetBlockParam.

• #length ⇒ Object
• #pushes ⇒ Object
• #to_a(iseq) ⇒ Object

Methods inherited from Instruction

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

Constructor Details

#initialize(index, level) ⇒ GetBlockParam

# File 'lib/syntax_tree/yarv/instructions.rb', line 1542

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

Instance Attribute Details

#index ⇒ Object (readonly)

Returns the value of attribute index.

# File 'lib/syntax_tree/yarv/instructions.rb', line 1540

def index
  @index
end

#level ⇒ Object (readonly)

Returns the value of attribute level.

# File 'lib/syntax_tree/yarv/instructions.rb', line 1540

def level
  @level
end

Instance Method Details

#==(other) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1561

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

#call(vm) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1574

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

#deconstruct_keys(_keys) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1557

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

#disasm(fmt) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1547

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

#length ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1566

def length
  3
end

#pushes ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1570

def pushes
  1
end

#to_a(iseq) ⇒ Object

# File 'lib/syntax_tree/yarv/instructions.rb', line 1551

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