Class: Furnace::CFG::Graph

Inherits:
Object
  • Object
show all
Includes:
Algorithms
Defined in:
lib/furnace/cfg/graph.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Algorithms

#compute_generic_domination, #dominators, #eliminate_unreachable!, #identify_loops, #merge_redundant!, #postdominators

Constructor Details

#initialize ⇒ Graph

Returns a new instance of Graph.



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# File 'lib/furnace/cfg/graph.rb', line 8

def initialize
  @nodes = Set.new

  @source_map = nil
  @label_map  = {}
end

Instance Attribute Details

#entry ⇒ Object

Returns the value of attribute entry.



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# File 'lib/furnace/cfg/graph.rb', line 6

def entry
  @entry
end

#exit ⇒ Object

Returns the value of attribute exit.



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# File 'lib/furnace/cfg/graph.rb', line 6

def exit
  @exit
end

#nodes ⇒ Object (readonly)

Returns the value of attribute nodes.



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# File 'lib/furnace/cfg/graph.rb', line 5

def nodes
  @nodes
end

Instance Method Details

#find_node(label) ⇒ Object 



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# File 'lib/furnace/cfg/graph.rb', line 15

def find_node(label)
  if node = @label_map[label]
    node
  elsif node = @nodes.find { |n| n.label == label }
    @label_map[label] = node
    node
  else
    raise "Cannot find CFG node #{label}"
  end
end

#flush ⇒ Object 



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# File 'lib/furnace/cfg/graph.rb', line 55

def flush
  @source_map = nil
  @label_map.clear

  super if defined?(super)
end

#sources_for(node, find_exceptions = false) ⇒ Object 



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# File 'lib/furnace/cfg/graph.rb', line 26

def sources_for(node, find_exceptions=false)
  unless @source_map
    @source_map = Hash.new { |h, k| h[k] = [] }
    @exception_source_map = Hash.new { |h, k| h[k] = [] }

    @nodes.each do |node|
      node.targets.each do |target|
        @source_map[target] << node
      end

      @exception_source_map[node.exception] << node
    end

    @source_map.each do |node, sources|
      sources.freeze
    end

    @exception_source_map.each do |node, sources|
      sources.freeze
    end
  end

  if find_exceptions
    @exception_source_map[node]
  else
    @source_map[node]
  end
end

#to_graphviz ⇒ Object 



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# File 'lib/furnace/cfg/graph.rb', line 62

def to_graphviz
  Furnace::Graphviz.new do |graph|
    @nodes.each do |node|
      if node.label == nil
        contents = "<exit>"
      else
        contents = "<#{node.label.inspect}>"
      end

      if node.metadata.any?
        contents << "\n#{node.metadata.inspect}"
      end

      if node.insns.any?
        contents << "\n#{node.insns.map(&:inspect).join("\n")}"
      end

      options = {}
      if @entry == node
        options.merge! color: 'green'
      elsif @exit == node
        options.merge! color: 'red'
      end

      graph.node node.label, contents, options

      node.target_labels.each_with_index do |label, idx|
        graph.edge node.label, label, "#{idx}"
      end

      if node.exception_label
        graph.edge node.label, node.exception_label, "", color: 'orange'
      end
    end
  end
end