Compiler Walkthrough Illustration

Posted by rue, Fri Nov 09 19:49:00 UTC 2007

Note: this is a sort of a draft. See the real document over in the repo. 
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# Start
[:block, 
  [:newline, 1, "(eval)", 
    [:defn, :foo, 
      [:scope, 
        [:block, 
          [:args, [:a, :b], [], nil, nil], 
          [:newline, 1, "(eval)", 
            [:yield, 
              [:call, [:lvar, :a, 0], :+, [:array, [:lvar, :b, 0]]], false
            ]
          ]
        ], 
        [:a, :b]
      ]
    ]
  ]
]

# into_script
[:script,  
 [:block, 
   [:newline, 1, "(eval)", 
    [:defn, :foo, 
      [:scope, 
        [:block, 
          [:args, [:a, :b], [], nil, nil], 
          [:newline, 1, "(eval)", 
            [:yield, 
              [:call, [:lvar, :a, 0], :+, [:array, [:lvar, :b, 0]]], false
            ]
          ]
        ], 
        [:a, :b]
      ]
    ]
   ]
  ]
]

# Script.create strips :script
[
 [:block, 
   [:newline, 1, "(eval)", 
     [:defn, :foo, 
       [:scope, 
         [:block, 
           [:args, [:a, :b], [], nil, nil], 
           [:newline, 1, "(eval)", 
             [:yield, 
               [:call, [:lvar, :a, 0], :+, [:array, [:lvar, :b, 0]]], false
             ]
           ]
         ], 
         [:a, :b]
       ]
     ]
   ]
 ]
]
# out = [<script node>]


# Script.consume
# convert sexp.first ->
# Block.create comp, sexp
 [:block, 
   [:newline, 1, "(eval)", 
     [:defn, :foo, 
       [:scope, 
         [:block, 
           [:args, [:a, :b], [], nil, nil], 
           [:newline, 1, "(eval)", 
             [:yield, 
               [:call, [:lvar, :a, 0], :+, [:array, [:lvar, :b, 0]]], false
             ]
           ]
         ], 
         [:a, :b]
       ]
     ]
   ]
 ]
# out = [<block node>]

# Block#consume sexp.shift
 [ 
   [:newline, 1, "(eval)", 
     [:defn, :foo, 
       [:scope, 
         [:block, 
           [:args, [:a, :b], [], nil, nil], 
           [:newline, 1, "(eval)", 
             [:yield, 
               [:call, [:lvar, :a, 0], :+, [:array, [:lvar, :b, 0]]], false
             ]
           ]
         ], 
         [:a, :b]
       ]
     ]
   ]
 ]
# out = [<newline node>]

# Compiler#convert_sexp first
# -> Newline.create
# Newline.new.consume sexp.shift
   [1, "(eval)", 
     [:defn, :foo, 
       [:scope, 
         [:block, 
           [:args, [:a, :b], [], nil, nil], 
           [:newline, 1, "(eval)", 
             [:yield, 
               [:call, [:lvar, :a, 0], :+, [:array, [:lvar, :b, 0]]], false
             ]
           ]
         ], 
         [:a, :b]
       ]
     ]
   ]

# << out = [1, "eval", <defn node>]
# compiler.convert <defn node>

# Define.create
# Define.new.consume sexp.shift
# name = sexp[0] (:foo), body = sexp[1..-1]
# scope = super(body)
# ClosedScope#consume body
     [
       [:scope, 
         [:block, 
           [:args, [:a, :b], [], nil, nil], 
           [:newline, 1, "(eval)", 
             [:yield, 
               [:call, [:lvar, :a, 0], :+, [:array, [:lvar, :b, 0]]], false
             ]
           ]
         ], 
         [:a, :b]
       ]
     ]
# out = []

# Scope.new.consume sexp.shift
# convert args.first, 
# out = [<converted>, locals]
       [ 
         [:block, 
           [:args, [:a, :b], [], nil, nil], 
           [:newline, 1, "(eval)", 
             [:yield, 
               [:call, [:lvar, :a, 0], :+, [:array, [:lvar, :b, 0]]], false
             ]
           ]
         ], 
         [:a, :b]
       ]

# Block.new.consume sexp.shift
# :args => convert
# :newline => convert

         [ 
           [:args, [:a, :b], [], nil, nil], 
           [:newline, 1, "(eval)", 
             [:yield, 
               [:call, [:lvar, :a, 0], :+, [:array, [:lvar, :b, 0]]], false
             ]
           ]


# out = [<args node>, <newline node>] 

# Arguments.new.consume sexp.shift
[[:a, :b], [], nil, nil]

# Newline.new.consume sexp.shift
            [1, "(eval)", 
             [:yield, 
               [:call, [:lvar, :a, 0], :+, [:array, [:lvar, :b, 0]]], false
             ]
            ]

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