class SyntaxTree::YARV::LocalTable

This represents every local variable associated with an instruction sequence. There are two kinds of locals: plain locals that are what you expect, and block proxy locals, which represent local variables associated with blocks that were passed into the current instruction sequence.

Attributes

locals[R]

Public Class Methods

new() click to toggle source

# File lib/syntax_tree/yarv/local_table.rb, line 43
def initialize
  @locals = []
end

Public Instance Methods

block(name) click to toggle source

Add a BlockLocal to the local table.

# File lib/syntax_tree/yarv/local_table.rb, line 73
def block(name)
  locals << BlockLocal.new(name) unless has?(name)
end

empty?() click to toggle source

# File lib/syntax_tree/yarv/local_table.rb, line 47
def empty?
  locals.empty?
end

find(name, level = 0) click to toggle source

# File lib/syntax_tree/yarv/local_table.rb, line 51
def find(name, level = 0)
  index = locals.index { |local| local.name == name }
  Lookup.new(locals[index], index, level) if index
end

has?(name) click to toggle source

# File lib/syntax_tree/yarv/local_table.rb, line 56
def has?(name)
  locals.any? { |local| local.name == name }
end

name_at(index) click to toggle source

# File lib/syntax_tree/yarv/local_table.rb, line 64
def name_at(index)
  locals[index].name
end

names() click to toggle source

# File lib/syntax_tree/yarv/local_table.rb, line 60
def names
  locals.map(&:name)
end

offset(index) click to toggle source

This is the offset from the top of the stack where this local variable lives.

# File lib/syntax_tree/yarv/local_table.rb, line 84
def offset(index)
  size - (index - 3) - 1
end

plain(name) click to toggle source

Add a PlainLocal to the local table.

# File lib/syntax_tree/yarv/local_table.rb, line 78
def plain(name)
  locals << PlainLocal.new(name) unless has?(name)
end

size() click to toggle source

# File lib/syntax_tree/yarv/local_table.rb, line 68
def size
  locals.length
end