Class: FastRuby::Inliner

Inherits:
Object show all
Defined in:
lib/fastruby/builder/inliner.rb,
lib/fastruby/modules/inliner/call.rb,
lib/fastruby/modules/inliner/defn.rb,
lib/fastruby/modules/inliner/recursive.rb

Defined Under Namespace

Classes: BlockProcessing

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(inferencer) ⇒ Inliner

Returns a new instance of Inliner.



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# File 'lib/fastruby/builder/inliner.rb', line 28

def initialize(inferencer)
  @inlined_methods = Array.new
  @inferencer = inferencer
end

Instance Attribute Details

#inlined_methods ⇒ Object (readonly)

Returns the value of attribute inlined_methods.



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# File 'lib/fastruby/builder/inliner.rb', line 26

def inlined_methods
  @inlined_methods
end

Instance Method Details

#add_prefix(tree, prefix) ⇒ Object 



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# File 'lib/fastruby/modules/inliner/call.rb', line 86

def add_prefix(tree, prefix)
  tree = tree.duplicate
  tree.walk_tree do |subtree|
    if subtree.node_type == :lvar or subtree.node_type == :lasgn
      subtree[1] = inline_local_name(prefix, subtree[1])
    end
  end
  
  tree
end

#call(*args) ⇒ Object 



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# File 'lib/fastruby/builder/inliner.rb', line 37

def call(*args)
  if args.first.find_tree{|tree| tree.node_type == :call && tree[2] != :infer && infer_type(tree[1] || fs(:self))}
    inline *args
  else
    args.first
  end
end

#catch_block(name, tree) ⇒ Object 



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# File 'lib/fastruby/modules/inliner/call.rb', line 97

def catch_block(name,tree)
  fs(:block,fs(:iter, fs(:call, nil, :_catch, fs(:arglist, fs(:lit,name.to_sym))),nil,tree))
end

#infer_type(recv) ⇒ Object 



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# File 'lib/fastruby/builder/inliner.rb', line 47

def infer_type(recv)
  array = @inferencer.infer(recv).to_a
  
  if array.size == 1
    array[0]
  else
    nil
  end
end

#inline_local_name(method_name, local_name) ⇒ Object 



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# File 'lib/fastruby/modules/inliner/call.rb', line 72

def inline_local_name(method_name, local_name)
  "__inlined_#{method_name.to_s.gsub("_x_", "_x__x_").gsub(/\W/){|x| "_x_#{x.ord}" }}_#{local_name}".to_sym
end

#method_obj_or_gtfo(klass, method_name) ⇒ Object 



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# File 'lib/fastruby/modules/inliner/call.rb', line 81

def method_obj_or_gtfo(klass, method_name)
  return nil unless klass.respond_to?(:fastruby_method)
  klass.fastruby_method(method_name)
end

#method_tree_to_inlined_block(mobject, call_tree, method_name, block_args_tree = nil, block_tree = nil) ⇒ Object 



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# File 'lib/fastruby/modules/inliner/call.rb', line 101

def method_tree_to_inlined_block(mobject, call_tree, method_name, block_args_tree = nil, block_tree = nil)
    args_tree = call_tree[3]
    recv_tree = call_tree[1] || fs(:self)
    
    target_method_tree = mobject.tree 
    
    @method_index = (@method_index || 0) + 1
    
    prefix = method_name.to_s + "_" + @method_index.to_s
    target_method_tree_block = add_prefix(target_method_tree.find_tree(:scope)[1], prefix)
    
    if target_method_tree_block.find_tree(:return)
      inlined_name = inline_local_name(method_name, "main_return_tagname")
      target_method_tree_block = catch_block(inlined_name,target_method_tree_block)
      
      target_method_tree_block.walk_tree do |subtree|
        if subtree[0] == :return
          if subtree[1]
            subtree[0..-1] = fs(:call, nil, :_throw, fs(:arglist, fs(:lit,inlined_name.to_sym), subtree[1]))
          else
            subtree[0..-1] = fs(:call, nil, :_throw, fs(:arglist, fs(:lit,inlined_name.to_sym), fs(:nil)))
          end
        end
      end
    end
    
    target_method_tree_args = target_method_tree[2]

    newblock = fs(:block)
    
    (1..args_tree.size-1).each do |i|
      itype = infer_type(args_tree[i])
      inlined_name = inline_local_name(prefix, target_method_tree_args[i])
      newblock << fs(:lasgn, inlined_name, recursive_inline(args_tree[i].duplicate))
    end
    
    inlined_name = inline_local_name(prefix, :self)
    newblock << fs(:lasgn, inlined_name, recv_tree.duplicate)
    
    return nil if target_method_tree_block.find_tree(:return)

    break_tag = nil
    
    if block_tree
      block_tree = recursive_inline(block_tree)
      if block_tree.find_tree(:break) # FIXME: discard nested iter calls on finding
        break_tag =  inline_local_name(prefix, "__break_tag")
      end
    end
     
    block_num = 0
    
    target_method_tree_block.walk_tree do |subtree|
      if subtree.node_type == :call
        if subtree[1] == nil
          if subtree[2] == :block_given?
            subtree[0..-1] = block_tree ? fs(:true) : fs(:false)
          else
            subtree[1] = recv_tree.duplicate
          end
        end
      end
      if subtree.node_type == :self
        subtree[0] = :lvar
        subtree[1] = inline_local_name(prefix, :self)
      end
      if subtree.node_type == :yield
        if block_tree
          # inline yield
          yield_call_args = subtree.duplicate
          
          subtree[0..-1] = fs(:block)
          
          if block_args_tree
            return nil if yield_call_args[1..-1].find{|x| x.node_type == :splat}
            if block_args_tree.node_type == :masgn
              return nil if block_args_tree[1].size != yield_call_args.size
              return nil if block_args_tree[1][1..-1].find{|x| x.node_type == :splat}
          
              (1..yield_call_args.size-1).each do |i|
                inlined_name = block_args_tree[1][i][1]
                subtree << fs(:lasgn, inlined_name, yield_call_args[i])
              end
            else
              return nil if 2 != yield_call_args.size

              inlined_name = block_args_tree[1]
              subtree << fs(:lasgn, inlined_name, yield_call_args[1])
            end
          else
            return nil if yield_call_args.size > 1
          end
          
          if block_tree.find_tree(:next) or block_tree.find_tree(:redo) or break_tag
            inlined_name = inline_local_name(prefix, "block_block_#{block_num}")
            block_num = block_num + 1
            
            alt_block_tree = BlockProcessing.new(inlined_name, break_tag).process(block_tree)
            alt_block_tree = catch_block(inlined_name,alt_block_tree)
          else
            alt_block_tree = block_tree.duplicate
          end
          subtree << alt_block_tree
        else
          subtree[0..-1] = fs(:call, fs(:nil), :raise, fs(:arglist, fs(:const, :LocalJumpError), fs(:str, "no block given")))
        end
      end
    end
    
    @inlined_methods << mobject
    
    if break_tag
      inner_block = fs(:block)
      target_method_tree_block[1..-1].each do |subtree|
        inner_block << subtree
      end
      
      newblock << catch_block(break_tag,inner_block)
    else
      target_method_tree_block[1..-1].each do |subtree|
        newblock << subtree
      end
    end
    newblock
end

#recursive_inline(tree) ⇒ Object 



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# File 'lib/fastruby/modules/inliner/recursive.rb', line 28

def recursive_inline(tree)
  tree.map{|subtree| inline subtree}
end