Module: FastRuby::FlowControlTranslator

Defined in:
lib/fastruby/translator/modules/flow.rb

Instance Method Summary collapse

Instance Method Details

#to_c_case(tree, result_var = nil) ⇒ Object 



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# File 'lib/fastruby/translator/modules/flow.rb', line 26

def to_c_case(tree, result_var = nil)

  tmpvarname = "tmp" + rand(1000000).to_s;
  @repass_var = tmpvarname
  outputvar = result_var || ("tmp_" + rand(1000000).to_s);
  
  code = tree[2..-2].map{|subtree|

    # this subtree is a when
    subtree[1][1..-1].map{|subsubtree|
      c_calltree = s(:call, nil, :inline_c, s(:arglist, s(:str, tmpvarname), s(:false)))
      calltree = s(:call, subsubtree, :===, s(:arglist, c_calltree))
          "
           if (RTEST(#{to_c_call(calltree)})) {
              #{to_c(subtree[2],outputvar)};
           }
          "
    }.join(" else ")

  }.join(" else ") + "else {
    #{
    if tree[-1] 
     to_c tree[-1],outputvar
    end
    };
  }
  "
  
  ret_code = "
    {
      #{
      unless result_var
      VALUE #{outputvar} = Qnil;
      end
      }
      
      VALUE #{tmpvarname} = Qnil;
      #{to_c tree[1], tmpvarname};
      
      // case
      #{code}
      #{
      unless result_var
        "return #{outputvar};"
      end
      }
    }
  "

  if result_var
    ret_code
  else
    inline_block ret_code
  end
end

#to_c_for(tree) ⇒ Object 



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# File 'lib/fastruby/translator/modules/flow.rb', line 111

def to_c_for(tree)
  alter_tree = tree.dup
  alter_tree[0] = :iter
  alter_tree[1] = [:call, alter_tree[1], :each, [:arglist]]
  to_c alter_tree
end

#to_c_if(tree, result_variable_ = nil) ⇒ Object 



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# File 'lib/fastruby/translator/modules/flow.rb', line 82

def to_c_if(tree, result_variable_ = nil)
  condition_tree = tree[1]
  impl_tree = tree[2]
  else_tree = tree[3]
  
  result_variable = result_variable_ || "last_expression"
  
  code = "
    {
      VALUE condition_result;
      #{to_c condition_tree, "condition_result"};
      if (RTEST(condition_result)) {
        #{to_c impl_tree, result_variable};
      }#{else_tree ?
        " else {
        #{to_c else_tree, result_variable};
        }
        " : ""
      }
    }
  "

  if result_variable_
    code
  else
    inline_block code + "; return last_expression;"
  end
end

#to_c_while(tree, result_var = nil) ⇒ Object 



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# File 'lib/fastruby/translator/modules/flow.rb', line 118

def to_c_while(tree, result_var = nil)
  
  begin_while = "begin_while_"+rand(10000000).to_s
  end_while = "end_while_"+rand(10000000).to_s
  aux_varname = "_aux_" + rand(10000000).to_s
  code = "
    {
      VALUE while_condition;
      VALUE #{aux_varname};
      
#{begin_while}:
      #{to_c tree[1], "while_condition"};
      if (!RTEST(while_condition)) goto #{end_while}; 
      #{to_c tree[2], aux_varname};
      goto #{begin_while};
#{end_while}:
      
      #{
      if result_var
        "#{result_var} = Qnil;"
      else
        "return Qnil;"
      end
      }
    }
  "
  
  if result_var
    code
  else
    inline_block code
  end
  
end