Refactor files to cljcc-compiler and cli tool.

4 files changed, 0 insertions, 952 deletions

diff --git a/src/cljcc/analyze/core.clj b/src/cljcc/analyze/core.clj
deleted file mode 100644
index 793b667..0000000
--- a/src/cljcc/analyze/core.clj
+++ /dev/null
@@ -1,10 +0,0 @@
-(ns cljcc.analyze.core
-  (:require [cljcc.analyze.resolve :as r]
-            [cljcc.analyze.label-loops :as l]
-            [cljcc.analyze.typecheck :as t]))
-
-(defn validate [program]
-  (-> program
-      r/resolve-program
-      l/label-loops
-      t/typecheck))
diff --git a/src/cljcc/analyze/label_loops.clj b/src/cljcc/analyze/label_loops.clj
deleted file mode 100644
index 56fffc9..0000000
--- a/src/cljcc/analyze/label_loops.clj
+++ /dev/null
@@ -1,105 +0,0 @@
-(ns cljcc.analyze.label-loops
-  (:require [cljcc.parser :as p]
-            [cljcc.exception :as exc]
-            [cljcc.analyze.resolve :as r]
-            [cljcc.schema :as s]
-            [cljcc.util :as util]
-            [malli.dev.pretty :as pretty]))
-
-(defn- unique-identifier [identifier]
-  (util/create-identifier! identifier))
-
-(defn- annotate-label [m label]
-  (assoc m :label label))
-
-(defn- label-statement
-  ([s]
-   (label-statement s nil))
-  ([{:keys [statement-type] :as s} current-label]
-   (condp = statement-type
-     :break (if (nil? current-label)
-              (exc/analyzer-error "break statement outside of loop" s)
-              (p/break-statement-node current-label))
-     :continue (if (nil? current-label)
-                 (exc/analyzer-error "continue statement outside of loop" s)
-                 (p/continue-statement-node current-label))
-     :while (let [new-label (unique-identifier "while_label")
-                  l-body (label-statement (:body s) new-label)
-                  l-while  (p/while-statement-node (:condition s) l-body)]
-              (annotate-label l-while new-label))
-     :do-while (let [new-label (unique-identifier "do_while_label")
-                     l-body (label-statement (:body s) new-label)
-                     l-do-while (p/do-while-statement-node (:condition s) l-body)]
-                 (annotate-label l-do-while new-label))
-     :for (let [new-label (unique-identifier "for_label")
-                l-body (label-statement (:body s) new-label)
-                l-for (p/for-statement-node (:init s) (:condition s) (:post s) l-body)]
-            (annotate-label l-for new-label))
-     :if (if (:else-statement s)
-           (p/if-statement-node (:condition s)
-                                (label-statement (:then-statement s) current-label)
-                                (label-statement (:else-statement s) current-label))
-           (p/if-statement-node (:condition s)
-                                (label-statement (:then-statement s) current-label)))
-     :compound (let [update-block-f (fn [item]
-                                      (if (= (:type item) :statement)
-                                        (label-statement item current-label)
-                                        item))
-                     new-block (mapv update-block-f (:block s))]
-                 (p/compound-statement-node new-block))
-     :return s
-     :expression s
-     :empty s
-     (exc/analyzer-error "invalid statement reached during loop labelling." s))))
-
-(defn- label-loop-function-body [fn-declaration]
-  (let [statement? (fn [x] (= :statement (:type x)))
-        labelled-body (mapv (fn [block-item]
-                              (if (statement? block-item)
-                                (label-statement block-item)
-                                block-item))
-                            (:body fn-declaration))]
-    (assoc fn-declaration :body labelled-body)))
-
-(defn label-loops
-  "Annotates labels on looping constructs.
-
-  Parameter:
-    program: List of declarations / blocks"
-  [program]
-  (let [fn-declaration? (fn [x] (= :function (:declaration-type x)))]
-    (mapv (fn [block]
-            (if (fn-declaration? block)
-              (label-loop-function-body block)
-              block))
-          program)))
-
-(comment
-
-  (-> "./test-programs/example.c"
-      slurp
-      p/parse-from-src
-      r/resolve-program)
-
-  (-> "./test-programs/example.c"
-      slurp
-      p/parse-from-src
-      r/resolve-program
-      label-loops)
-
-  (pretty/explain
-   s/Program
-   (-> "./test-programs/example.c"
-       slurp
-       p/parse-from-src
-       r/resolve-program))
-
-  (pretty/explain
-   s/Program
-   (-> "./test-programs/example.c"
-       slurp
-       p/parse-from-src
-       r/resolve-program
-       label-loops))
-
-  ())
diff --git a/src/cljcc/analyze/resolve.clj b/src/cljcc/analyze/resolve.clj
deleted file mode 100644
index 9f09333..0000000
--- a/src/cljcc/analyze/resolve.clj
+++ /dev/null
@@ -1,300 +0,0 @@
-(ns cljcc.analyze.resolve
-  (:require [cljcc.exception :as exc]
-            [cljcc.parser :as p]
-            [malli.dev.pretty :as pretty]
-            [cljcc.schema :as s]
-            [cljcc.util :as util]
-            [malli.core :as m]))
-
-(defn- unique-identifier [identifier]
-  (util/create-identifier! identifier))
-
-(defn- copy-identifier-map
-  "Returns a copy of the identifier -> symbol map.
-
-  Sets :at-top-level false, as it's going inside a scope. ( Could be fn definition, compound statement ).
-  Sets :from-current-scope as false for every symbol. Used when going into a inner scope."
-  [ident->symbol]
-  (let [set-from-current-scope-as-false (fn [i->s]
-                                          (zipmap (keys i->s)
-                                                  (map (fn [s]
-                                                         (assoc s :from-current-scope false))
-                                                       (vals i->s))))]
-    (-> ident->symbol
-        (dissoc :at-top-level)
-        set-from-current-scope-as-false
-        (assoc :at-top-level false))))
-
-(declare resolve-block resolve-declaration resolve-optional-exp)
-
-(defn- resolve-exp [e ident->symbol]
-  (condp = (:exp-type e)
-    :constant-exp e
-    :variable-exp (if (contains? ident->symbol (:identifier e))
-                    (p/variable-exp-node (:name (get ident->symbol (:identifier e))))
-                    (exc/analyzer-error "Undeclared variable seen." {:variable e}))
-    :assignment-exp (let [left (:left e)
-                          right (:right e)
-                          op (:assignment-operator e)
-                          left-var? (= :variable-exp (:exp-type left))]
-                      (if left-var?
-                        (p/assignment-exp-node (resolve-exp left ident->symbol)
-                                               (resolve-exp right ident->symbol)
-                                               op)
-                        (exc/analyzer-error "Invalid lvalue in assignment expression." {:lvalue e})))
-    :binary-exp (p/binary-exp-node (resolve-exp (:left e) ident->symbol)
-                                   (resolve-exp (:right e) ident->symbol)
-                                   (:binary-operator e))
-    :unary-exp (p/unary-exp-node (:unary-operator e) (resolve-exp (:value e) ident->symbol))
-    :conditional-exp (p/conditional-exp-node (resolve-exp (:left e) ident->symbol)
-                                             (resolve-exp (:middle e) ident->symbol)
-                                             (resolve-exp (:right e) ident->symbol))
-    :cast-exp (p/cast-exp-node (:target-type e)
-                               (resolve-exp (:value e) ident->symbol))
-    :function-call-exp (let [fn-name (:identifier e)
-                             args (:arguments e)]
-                         (if (contains? ident->symbol fn-name)
-                           (p/function-call-exp-node (:new-name (get ident->symbol fn-name))
-                                                     (mapv #(resolve-exp % ident->symbol) args))
-                           (exc/analyzer-error "Undeclared function." {:function-name fn-name})))
-    (exc/analyzer-error "Invalid expression." {:exp e})))
-
-(defn- resolve-optional-exp [e ident->symbol]
-  (if (nil? e)
-    e
-    (resolve-exp e ident->symbol)))
-
-(defn- resolve-file-scope-variable-declaration
-  "Adds file scope variable declaration to scope.
-
-  Directly adds variable declaration to map as it is top level."
-  [{:keys [identifier] :as declaration} ident->symbol]
-  {:declaration declaration
-   :ident->symbol (assoc ident->symbol identifier {:new-name identifier
-                                                   :name identifier
-                                                   :from-current-scope true
-                                                   :has-linkage true})})
-
-(defn- resolve-local-variable-declaration
-  "Add local variable declaration.
-
-  Validates for variables declared with same name.
-  Validates for variables declared from different scope, but with conflicting storage class."
-  [{:keys [identifier initial variable-type storage-class] :as declaration} ident->symbol]
-  (let [prev-entry (get ident->symbol identifier)
-        extern? (= storage-class :extern)
-        _ (when (and prev-entry (:from-current-scope prev-entry))
-            (when (not (and (:has-linkage prev-entry) extern?))
-              (exc/analyzer-error "Conflicting local declaration." {:declaration declaration})))]
-    (if extern?
-      {:declaration declaration
-       :ident->symbol (assoc ident->symbol identifier {:new-name identifier
-                                                       :name identifier
-                                                       :from-current-scope true
-                                                       :has-linkage true})}
-      (let [unique-name (unique-identifier identifier)
-            updated-symbols (assoc ident->symbol identifier {:new-name unique-name
-                                                             :name unique-name
-                                                             :from-current-scope true
-                                                             :has-linkage false})
-            init-value (when initial (resolve-exp initial updated-symbols))]
-        {:declaration (p/variable-declaration-node unique-name storage-class variable-type init-value)
-         :ident->symbol updated-symbols}))))
-
-(defn- resolve-variable-declaration
-  "Resolves variable declarations.
-
-  Ensures variable not declared twice in the current scope."
-  [decl {:keys [at-top-level] :as ident->symbol}]
-  (if at-top-level
-    (resolve-file-scope-variable-declaration decl ident->symbol)
-    (resolve-local-variable-declaration decl ident->symbol)))
-
-(defn- resolve-parameter [parameter ident->symbol]
-  (if (and (contains? ident->symbol parameter)
-           (:from-current-scope (get ident->symbol parameter)))
-    (exc/analyzer-error "Parameter name duplicated." {:parameter parameter})
-    (let [unique-name (unique-identifier parameter)
-          updated-identifier-map (assoc ident->symbol parameter {:name unique-name
-                                                                 :from-current-scope true
-                                                                 :has-linkage false})]
-      {:parameter unique-name
-       :ident->symbol updated-identifier-map})))
-
-(defn- resolve-parameters [params ident->symbol]
-  (reduce (fn [acc p]
-            (let [{:keys [parameter ident->symbol]} (resolve-parameter p (:ident->symbol acc))]
-              {:parameters (conj (:parameters acc) parameter)
-               :ident->symbol ident->symbol}))
-          {:parameters [] :ident->symbol ident->symbol}
-          params))
-
-(defn- resolve-function-declaration
-  "Resolve function declaration.
-
-  Ensures functions not declared twice in current scope with incorrect linkage."
-  [{:keys [identifier storage-class parameters function-type body] :as d} ident->symbol]
-  (let [prev-entry (get ident->symbol identifier)
-        already-declared-var? (and (contains?  ident->symbol identifier)
-                                   (:from-current-scope (get ident->symbol identifier))
-                                   (not (:has-linkage prev-entry)))
-        illegally-redeclared? (and (contains? ident->symbol identifier)
-                                   (:from-current-scope prev-entry)
-                                   (not (:has-linkage prev-entry)))
-        static? (= :static storage-class)
-        inside-function-definition? (not (:at-top-level ident->symbol))
-        _ (when already-declared-var?
-            (exc/analyzer-error "Variable already declared in same scope." {:declaration d}))
-        _ (when illegally-redeclared?
-            (exc/analyzer-error "Function duplicate declaration." {:declaration d}))
-        updated-identifier-map (assoc ident->symbol identifier {:new-name identifier
-                                                                :name identifier
-                                                                :from-current-scope true
-                                                                :has-linkage true})
-        inner-map (copy-identifier-map updated-identifier-map)
-        {new-params :parameters, inner-map :ident->symbol} (resolve-parameters parameters inner-map)
-        _ (when (and body inside-function-definition?)
-            (exc/analyzer-error "Nested function definition not allowed." {:declaration d
-                                                                           :ident->symbol ident->symbol}))
-        _ (when (and inside-function-definition? static?)
-            (exc/analyzer-error "Nested static function declarations cannot exist." {:declaration d}))
-        new-body (when body (resolve-block body inner-map))]
-    {:declaration (p/function-declaration-node function-type storage-class identifier new-params (:block new-body))
-     :ident->symbol updated-identifier-map}))
-
-(defn- resolve-declaration [{:keys [declaration-type] :as d} ident->symbol]
-  (condp = declaration-type
-    :variable (resolve-variable-declaration d ident->symbol)
-    :function (resolve-function-declaration d ident->symbol)
-    (exc/analyzer-error "Invalid declaration type" {:declaration d})))
-
-(defn- resolve-for-init [for-init ident->symbol]
-  (if (= (:type for-init) :declaration)
-    (resolve-declaration for-init ident->symbol)
-    (resolve-optional-exp for-init ident->symbol)))
-
-(defmulti resolve-statement
-  "Resolves statements in a given scope.
-
-  Scope here refers to the ident->symbol map, which holds declarations
-  visisble to statement at this time.
-
-  Dispatches based on the type of statement.
-
-  Returns statement after recursively resolving all expressions and statements.
-  "
-  (fn [statement _ident->symbol]
-    (:statement-type statement)))
-
-(defmethod resolve-statement :default [statement _]
-  (exc/analyzer-error "Invalid statement." {:statement statement}))
-
-(defmethod resolve-statement :return [{:keys [value]} ident->symbol]
-  (p/return-statement-node (resolve-exp value ident->symbol)))
-
-(defmethod resolve-statement :break [statement _]
-  statement)
-
-(defmethod resolve-statement :continue [statement _]
-  statement)
-
-(defmethod resolve-statement :empty [statement _]
-  statement)
-
-(defmethod resolve-statement :expression [{:keys [value]} ident->symbol]
-  (p/expression-statement-node (resolve-exp value ident->symbol)))
-
-(defmethod resolve-statement :if [{:keys [condition then-statement else-statement]} ident->symbol]
-  (if else-statement
-    (p/if-statement-node (resolve-exp condition ident->symbol)
-                         (resolve-statement then-statement ident->symbol)
-                         (resolve-statement else-statement ident->symbol))
-    (p/if-statement-node (resolve-exp condition ident->symbol)
-                         (resolve-statement then-statement ident->symbol))))
-
-(defmethod resolve-statement :while [{:keys [condition body]} ident->symbol]
-  (p/while-statement-node (resolve-exp condition ident->symbol)
-                          (resolve-statement body ident->symbol)))
-
-(defmethod resolve-statement :do-while [{:keys [condition body]} ident->symbol]
-  (p/do-while-statement-node (resolve-exp condition ident->symbol)
-                             (resolve-statement body ident->symbol)))
-
-(defmethod resolve-statement :for [{:keys [init condition post body]} ident->symbol]
-  (let [for-scope-identifier-map (copy-identifier-map ident->symbol)
-        resolved-for-init (resolve-for-init init for-scope-identifier-map)
-        for-scope-identifier-map (if (:declaration resolved-for-init) ; updates symbol map if for initializer is declaration
-                                   (:ident->symbol resolved-for-init)
-                                   for-scope-identifier-map)
-        resolved-for-init (if (:declaration resolved-for-init) ; getting the underlying declaration, if it is
-                            (:declaration resolved-for-init)
-                            resolved-for-init)
-        condition (resolve-optional-exp condition for-scope-identifier-map)
-        post (resolve-optional-exp post for-scope-identifier-map)
-        body (resolve-statement body for-scope-identifier-map)]
-    (p/for-statement-node resolved-for-init condition post body)))
-
-(defmethod resolve-statement :compound [{:keys [block]} ident->symbol]
-  (p/compound-statement-node (:block (resolve-block block (copy-identifier-map ident->symbol)))))
-
-(defn- resolve-block-item [{:keys [type] :as item} ident->symbol]
-  (condp = type
-    :declaration (let [{d :declaration
-                        i->s :ident->symbol} (resolve-declaration item ident->symbol)]
-                   {:block-item d
-                    :ident->symbol i->s})
-    :statement {:block-item (resolve-statement item ident->symbol)
-                :ident->symbol ident->symbol}))
-
-(defn- resolve-block
-  "Resolves a block under a given symbol table.
-
-  Block is list of block items.
-
-  ident->symbol holds identifier to symbol mapping.
-  Symbol contains the type information, generated variable name etc.
-
-  | key            | description |
-  |----------------|-------------|
-  |`:at-top-level` | Is current level top or not ( default true)|"
-  ([block]
-   (resolve-block block {:at-top-level true}))
-  ([block ident->symbol]
-   (let [reduce-f (fn [acc block-item]
-                    (let [res (resolve-block-item block-item (:ident->symbol acc))]
-                      {:block (conj (:block acc) (:block-item res))
-                       :ident->symbol (:ident->symbol res)}))]
-     (reduce reduce-f
-             {:block []
-              :ident->symbol ident->symbol}
-             block))))
-
-;; Program is list of block items, which are themselves just blocks.
-(defn resolve-program [program]
-  (let [res (:block (resolve-block program))]
-        ; _ (m/coerce s/Program res)]
-    res))
-
-(comment
-
-  (def file-path "./test-programs/example.c")
-
-  (slurp "./test-programs/example.c")
-
-  (-> file-path
-      slurp
-      p/parse-from-src)
-
-  (-> file-path
-      slurp
-      p/parse-from-src
-      resolve-program)
-
-  (pretty/explain
-   s/Program
-   (-> file-path
-       slurp
-       p/parse-from-src
-       resolve-program))
-
-  ())
diff --git a/src/cljcc/analyze/typecheck.clj b/src/cljcc/analyze/typecheck.clj
deleted file mode 100644
index d1e79dc..0000000
--- a/src/cljcc/analyze/typecheck.clj
+++ /dev/null
@@ -1,537 +0,0 @@
-(ns cljcc.analyze.typecheck
-  (:require [malli.core :as m]
-            [malli.dev.pretty :as pretty]
-            [cljcc.parser :as p]
-            [cljcc.token :as t]
-            [cljcc.schema :as s]
-            [cljcc.symbol :as sym]
-            [clojure.core.match :refer [match]]
-            [cljcc.analyze.resolve :as r]
-            [cljcc.analyze.label-loops :as l]
-            [cljcc.exception :as exc]
-            [cljcc.util :as u]))
-
-(declare typecheck-block typecheck-declaration to-static-init)
-
-(defn set-type
-  "Assocs onto an expression given type."
-  [e t] (assoc e :value-type t))
-
-(defn get-type [e] (:value-type e))
-
-(defn- symbol-function? [s]
-  (= :function (:type (:type s))))
-
-(defmulti typecheck-exp
-  "Returns the expression, after typechecking nested expressions."
-  (fn [{:keys [exp-type]} _ident->symbol] exp-type))
-
-(defmethod typecheck-exp :constant-exp
-  [{:keys [value] :as e} _]
-  (condp = (:type value)
-    :int (set-type e {:type :int})
-    :long (set-type e {:type :long})
-    :uint (set-type e {:type :uint})
-    :ulong (set-type e {:type :ulong})
-    :double (set-type e {:type :double})
-    (exc/analyzer-error "Invalid type for constant expression." {:e e})))
-
-(defmethod typecheck-exp :variable-exp
-  [{:keys [identifier] :as e} ident->symbol]
-  (let [s (get ident->symbol identifier)]
-    (if (symbol-function? s)
-      (exc/analyzer-error "Function name used as variable." {:expression e})
-      (set-type e (:type s)))))
-
-(defmethod typecheck-exp :cast-exp
-  [{:keys [target-type value]} ident->symbol]
-  (let [typed-inner-e (typecheck-exp value ident->symbol)
-        cast-exp (p/cast-exp-node target-type typed-inner-e)]
-    (set-type cast-exp target-type)))
-
-(defmethod typecheck-exp :unary-exp
-  [{:keys [unary-operator value] :as e} ident->symbol]
-  (let [typed-inner-e (typecheck-exp value ident->symbol)
-        _ (when (and (= unary-operator :complement) (= {:type :double} (get-type typed-inner-e)))
-            (exc/analyzer-error "Can't take bitwise complement of double" {:expression e}))
-        unary-exp (p/unary-exp-node unary-operator typed-inner-e)]
-    (condp = unary-operator
-      :logical-not (set-type unary-exp {:type :int})
-      (set-type unary-exp (get-type typed-inner-e)))))
-
-(defn- get-common-type [t1 t2]
-  (cond
-    (= t1 t2) t1
-    (or (= t1 {:type :double})
-        (= t2 {:type :double})) {:type :double}
-    (= (u/get-type-size t1)
-       (u/get-type-size t2)) (if (u/type-signed? t1)
-                               t2
-                               t1)
-    (> (u/get-type-size t1)
-       (u/get-type-size t2)) t1
-    :else t2))
-
-(defn- convert-to-exp
-  "Returns expression, using casting if necessary."
-  [e t]
-  (if (= (get-type e) t)
-    e
-    (set-type (p/cast-exp-node t e) t)))
-
-(defmethod typecheck-exp :binary-exp
-  [{:keys [left right binary-operator] :as e} ident->symbol]
-  (let
-   [typed-left-e (typecheck-exp left ident->symbol)
-    typed-right-e (typecheck-exp right ident->symbol)]
-    (if (t/logical? binary-operator)
-      (set-type (p/binary-exp-node typed-left-e
-                                   typed-right-e
-                                   binary-operator)
-                {:type :int})
-      (let [tl (get-type typed-left-e)
-            tr (get-type typed-right-e)
-            _ (when (and (= :remainder binary-operator)
-                         (or (= {:type :double} tl)
-                             (= {:type :double} tr)))
-                (exc/analyzer-error "Operands to remainder operation cannot be double." {:expression e}))
-            common-type (get-common-type tl tr)
-            convert-left-exp (convert-to-exp typed-left-e common-type)
-            convert-right-exp (convert-to-exp typed-right-e common-type)
-            typed-binary-exp (p/binary-exp-node convert-left-exp convert-right-exp binary-operator)]
-        (if (t/arithmetic? binary-operator)
-          (set-type typed-binary-exp common-type)
-          (set-type typed-binary-exp {:type :int}))))))
-
-(defmethod typecheck-exp :assignment-exp
-  [{:keys [left right assignment-operator] :as _e} ident->symbol]
-  (let
-   [typed-left (typecheck-exp left ident->symbol)
-    typed-right (typecheck-exp right ident->symbol)
-    left-type (get-type typed-left)
-    converted-right (convert-to-exp typed-right left-type)
-    typed-assign-exp (p/assignment-exp-node typed-left converted-right assignment-operator)]
-    (set-type typed-assign-exp left-type)))
-
-(defmethod typecheck-exp :conditional-exp
-  [{:keys [left right middle] :as _e} m]
-  (let [t-left (typecheck-exp left m)
-        t-right (typecheck-exp right m)
-        t-middle (typecheck-exp middle m)
-        common-type (get-common-type (get-type t-middle) (get-type t-right))
-        convert-right (convert-to-exp t-right common-type)
-        convert-middle (convert-to-exp t-middle common-type)
-        typed-cond-e (p/conditional-exp-node t-left convert-middle convert-right)]
-    (set-type typed-cond-e common-type)))
-
-(defmethod typecheck-exp :function-call-exp
-  [{:keys [identifier arguments] :as e} ident->symbol]
-  (let
-   [{ftype :type :as symbol} (get ident->symbol identifier)]
-    (if (symbol-function? symbol)
-      (let [_ (when (not= (count arguments) (count (:parameter-types ftype)))
-                (exc/analyzer-error "Function called with wrong number of arguments."
-                                    {:expected (count (:parameter-types ftype))
-                                     :actual (count arguments)}))
-            cast-arg-to-param-type-f (fn [param-type arg]
-                                       (convert-to-exp (typecheck-exp arg ident->symbol)
-                                                       param-type))
-            converted-args (mapv cast-arg-to-param-type-f
-                                 (:parameter-types ftype)
-                                 arguments)
-            typed-fun-call-exp (p/function-call-exp-node identifier converted-args)]
-        (set-type typed-fun-call-exp (:return-type ftype)))
-      (exc/analyzer-error "Variable used as function name" {:symbol symbol
-                                                            :expression e}))))
-
-(defmulti typecheck-statement
-  "Dispatches based on type of statement.
-
-  Parameters:
-  - return-type: Return type of statement's enclosing function.
-  - statement
-  - ident->symbol: Symbol map for current scope."
-  (fn [_return-type {:keys [statement-type]} _ident->symbol]
-    statement-type))
-
-(defmethod typecheck-statement :return
-  [return-type {:keys [value]} ident->symbol]
-  {:statement (p/return-statement-node
-               (convert-to-exp (typecheck-exp value ident->symbol)
-                               return-type))
-   :ident->symbol ident->symbol})
-
-(defmethod typecheck-statement :expression
-  [_ {:keys [value]} ident->symbol]
-  {:statement (p/expression-statement-node (typecheck-exp value ident->symbol))
-   :ident->symbol ident->symbol})
-
-(defmethod typecheck-statement :break
-  [_ s m]
-  {:statement s
-   :ident->symbol m})
-
-(defmethod typecheck-statement :continue
-  [_ s m]
-  {:statement s
-   :ident->symbol m})
-
-(defmethod typecheck-statement :empty
-  [_ s m]
-  {:statement s
-   :ident->symbol m})
-
-(defmethod typecheck-statement :while
-  [return-type {:keys [condition body] :as stmt} m]
-  (let [typed-cond (typecheck-exp condition m)
-        typed-body (typecheck-statement return-type body m)]
-    {:statement (merge stmt (p/while-statement-node
-                             typed-cond
-                             (:statement typed-body)))
-     :ident->symbol (:ident->symbol typed-body)}))
-
-(defmethod typecheck-statement :do-while
-  [return-type {:keys [condition body] :as stmt} m]
-  (let [typed-cond (typecheck-exp condition m)
-        typed-body (typecheck-statement return-type body m)]
-    {:statement (merge stmt (p/do-while-statement-node
-                             typed-cond
-                             (:statement typed-body)))
-     :ident->symbol (:ident->symbol typed-body)}))
-
-(defn- typecheck-optional-expression [e m]
-  (if (nil? e)
-    e
-    (typecheck-exp e m)))
-
-(defn- typecheck-for-init [for-init ident->symbol]
-  (if (= (:type for-init) :declaration)
-    (typecheck-declaration for-init ident->symbol)
-    (typecheck-optional-expression for-init ident->symbol)))
-
-(defmethod typecheck-statement :for
-  [return-type {:keys [init post condition body] :as stmt} m]
-  (let [f-init (typecheck-for-init init m)
-        m' (if (:declaration f-init)
-             (:ident->symbol f-init)
-             m)
-        f-init (if (:declaration f-init)
-                 (:declaration f-init)
-                 f-init)
-        t-condition (typecheck-optional-expression condition m')
-        t-post (typecheck-optional-expression post m')
-        typed-body-statement (typecheck-statement return-type body m')]
-    {:statement (merge stmt
-                       (p/for-statement-node f-init t-condition t-post (:statement typed-body-statement)))
-     :ident->symbol (:ident->symbol typed-body-statement)}))
-
-(defmethod typecheck-statement :if
-  [return-type {:keys [condition then-statement else-statement]} m]
-  (if else-statement
-    (let [t-condition (typecheck-exp condition m)
-          {t-then :statement
-           m :ident->symbol} (typecheck-statement return-type then-statement m)
-          {t-else :statement
-           m :ident->symbol} (typecheck-statement return-type else-statement m)]
-      {:statement (p/if-statement-node t-condition t-then t-else)
-       :ident->symbol m})
-    (let [t-condition (typecheck-exp condition m)
-          {t-then :statement
-           m :ident->symbol} (typecheck-statement return-type then-statement m)]
-      {:statement (p/if-statement-node t-condition t-then)
-       :ident->symbol m})))
-
-(defmethod typecheck-statement :compound
-  [return-type {:keys [block]} m]
-  (let [typed-block (typecheck-block return-type block m)]
-    {:statement (p/compound-statement-node (:block typed-block))
-     :ident->symbol (:ident->symbol typed-block)}))
-
-(defn- typecheck-item [return-type {:keys [type] :as item} m]
-  (condp = type
-    :declaration (let [v (typecheck-declaration item m)]
-                   {:block-item (:declaration v)
-                    :ident->symbol (:ident->symbol v)})
-    :statement (let [v (typecheck-statement return-type item m)]
-                 {:block-item (:statement v)
-                  :ident->symbol (:ident->symbol v)})
-    (exc/analyzer-error "Invalid statement/declaration." item)))
-
-(defn- typecheck-block [return-type block ident->symbol]
-  (reduce (fn [acc item]
-            (let [v (typecheck-item return-type item (:ident->symbol acc))]
-              {:block (conj (:block acc) (:block-item v))
-               :ident->symbol (:ident->symbol v)}))
-          {:block []
-           :ident->symbol ident->symbol}
-          block))
-
-(defn- get-initial-value
-  [{:keys [initial storage-class variable-type] :as declaration}]
-  (let [constant-exp? (= :constant-exp (:exp-type initial))]
-    (cond
-      constant-exp? (to-static-init initial variable-type)
-      (nil? initial) (if (= :extern storage-class)
-                       (sym/no-initializer-iv)
-                       (sym/tentative-iv))
-      :else (exc/analyzer-error "Non-constant initializer." declaration))))
-
-(defn- const-convert
-  "Converts a constant initializer to a specific variable type.
-
-  Does type conversion if necessary."
-  [{ttype :type :as target-type} {const-type :type value :value :as const}]
-  (match [ttype const-type]
-    [:double :ulong] {:type :double
-                      :value (-> value
-                                 biginteger
-                                 (.doubleValue))}
-    [:double _] {:type :double
-                 :value (double value)}
-    [:ulong :double] {:type :ulong
-                      :value (-> value
-                                 biginteger
-                                 (.longValue))}
-    [(:or :int :uint) _] {:type ttype
-                          :value (-> value
-                                     unchecked-int
-                                     long)}
-    [(:or :long :ulong) _] {:type ttype
-                            :value (long value)}
-    :else (exc/analyzer-error "Invalid type passed to const-convert function."
-                              {:const const
-                               :target-type target-type})))
-
-(defn- zero-initializer
-  "Returns zero const initializer based on passed type."
-  [{:keys [type] :as _t}]
-  (condp = type
-    :int (sym/int-init 0)
-    :uint (sym/uint-init 0)
-    :long (sym/long-init 0)
-    :ulong (sym/ulong-init 0)
-    :double (sym/double-init (double 0))))
-
-(defn- to-static-init [{:keys [value exp-type] :as e} var-type]
-  (cond
-    (= :constant-exp exp-type) (let [{const-type :type
-                                      const-value :value} (const-convert var-type value)]
-                                 (condp = const-type
-                                   :int (sym/initial-iv (sym/int-init const-value))
-                                   :long (sym/initial-iv (sym/long-init const-value))
-                                   :uint (sym/initial-iv (sym/uint-init const-value))
-                                   :ulong (sym/initial-iv (sym/ulong-init const-value))
-                                   :double (sym/initial-iv (sym/double-init const-value))))
-    (nil? e) (sym/initial-iv (zero-initializer var-type))
-    :else (exc/analyzer-error "Non-constant initializer on static variable." e)))
-
-(defn- validate-file-scope-variable-declaration
-  [{:keys [variable-type storage-class] :as cur-decl} prev-symbol]
-  (let [_ (when (not= variable-type (:type prev-symbol))
-            (exc/analyzer-error "Redeclared with different types." {:declaration1 cur-decl
-                                                                    :declaration2 prev-symbol}))
-        global? (not= :static storage-class)
-        global? (cond
-                  (= :extern storage-class) (get-in prev-symbol [:attribute :global?])
-                  (not= global? (get-in prev-symbol [:attribute :global?])) (exc/analyzer-error "Conflicting variable linkage." {:d1 cur-decl
-                                                                                                                                 :d2 prev-symbol})
-                  :else global?)
-        initial-value (get-initial-value cur-decl)
-        initial-value (cond
-                        (=
-                         :initial
-                         (get-in prev-symbol [:attribute :initial-value :type])) (if (= (:type initial-value) :initial)
-                                                                                   (exc/analyzer-error "Conflicting file scope variable definition." {:d1 cur-decl
-                                                                                                                                                      :d2 prev-symbol})
-                                                                                   (get-in prev-symbol [:attribute :initial-value]))
-                        (and
-                         (= :tentative (get-in prev-symbol [:attribute :initial-value :type]))
-                         (not= :initial (:type initial-value))) {:type :tentative}
-                        :else initial-value)]
-    {:global? global?
-     :initial-value initial-value}))
-
-(defn- typecheck-file-scope-variable-declaration
-  [{:keys [identifier storage-class variable-type] :as d} ident->symbol]
-  (let [prev-symbol (get ident->symbol identifier)
-        global? (not= :static storage-class)
-        initial-value (get-initial-value d)
-        {global? :global?
-         initial-value :initial-value} (if prev-symbol
-                                         (validate-file-scope-variable-declaration d prev-symbol)
-                                         {:global? global?
-                                          :initial-value initial-value})]
-    {:declaration d
-     :ident->symbol (assoc ident->symbol
-                           identifier
-                           (sym/create-symbol variable-type (sym/static-attribute initial-value global?)))}))
-
-(defn- typecheck-local-scope-variable-declaration
-  [{:keys [identifier variable-type storage-class initial] :as d} ident->symbol]
-  (condp = storage-class
-    :extern (let [_ (when (not (nil? initial))
-                      (exc/analyzer-error "Initializer on local extern variable declaration." d))
-                  prev-symbol (get ident->symbol identifier)
-                  prev-type (:type prev-symbol)
-                  _ (when (and prev-symbol (not= prev-type variable-type))
-                      (exc/analyzer-error "Redeclared with different types." {:declaration1 d
-                                                                              :declaration2 prev-symbol}))
-                  symbols (if prev-symbol
-                            ident->symbol
-                            (assoc ident->symbol
-                                   identifier
-                                   (sym/create-symbol variable-type (sym/static-attribute (sym/no-initializer-iv) true))))]
-              {:declaration d
-               :ident->symbol symbols})
-    :static (let [initial-value (to-static-init initial variable-type)
-                  updated-symbols (assoc ident->symbol
-                                         identifier
-                                         (sym/create-symbol variable-type (sym/static-attribute initial-value false)))]
-              {:declaration d
-               :ident->symbol updated-symbols})
-    (let [updated-symbols (assoc ident->symbol
-                                 identifier
-                                 (sym/create-symbol
-                                  variable-type
-                                  (sym/local-attribute)))
-          casted-e (if (nil? initial)
-                     initial
-                     (convert-to-exp initial variable-type))
-          t-e (typecheck-optional-expression casted-e updated-symbols)]
-      {:declaration (assoc d :initial t-e)
-       :ident->symbol updated-symbols})))
-
-(defn- validate-old-fn-decl-return-attribute
-  [cur-decl prev-symbol]
-  (let [prev-function? (= :function (get-in prev-symbol [:type :type]))
-        _ (when-not prev-function?
-            (exc/analyzer-error "Variable being redeclared as function." {:declaration cur-decl
-                                                                          :prev-symbol prev-symbol}))
-        same-type? (and (= (get-in cur-decl [:function-type :parameter-types])
-                           (get-in prev-symbol [:type :parameter-types]))
-                        (= (get-in cur-decl [:function-type :return-type])
-                           (get-in prev-symbol [:type :return-type])))
-        _ (when-not same-type?
-            (exc/analyzer-error "Incompatible function type declarations." {:declaration cur-decl
-                                                                            :prev-declaration-type prev-symbol}))
-        defined? (seq (:body cur-decl))
-        prev-defined? (get-in prev-symbol [:attribute :defined?])
-        _ (when (and defined? prev-defined?)
-            (exc/analyzer-error "Function defined more than once." {:declaration cur-decl}))
-        current-static? (= :static (:storage-class cur-decl))
-        old-global? (get-in prev-symbol [:attribute :global?])
-        _ (when (and old-global? current-static?)
-            (exc/analyzer-error "Static function definition follows non static." {:declaration cur-decl}))]
-    {:defined? prev-defined?
-     :global? old-global?}))
-
-(defn- add-parameter-to-symbols
-  [parameters function-type ident->symbol]
-  (if (zero? (count parameters))
-    ident->symbol
-    (apply assoc
-           ident->symbol
-           (flatten
-            (map (fn [p t]
-                   [p (sym/create-symbol t (sym/local-attribute))])
-                 parameters
-                 (:parameter-types function-type))))))
-
-(defn- typecheck-function-declaration
-  [{:keys [identifier storage-class body parameters function-type] :as d} ident->symbol]
-  (let [body? (seq body)
-        prev-symbol (get ident->symbol identifier)
-        {defined? :defined?
-         global? :global?} (if prev-symbol
-                             (validate-old-fn-decl-return-attribute d prev-symbol)
-                             {:defined? false
-                              :global? (not= :static storage-class)})
-        function-attribute (sym/fun-attribute (boolean (or defined? body?)) global?)
-        updated-symbols (assoc ident->symbol
-                               identifier
-                               (sym/create-symbol
-                                function-type
-                                function-attribute))]
-    (if body?
-      (let [with-parameter-symbols (add-parameter-to-symbols
-                                    parameters
-                                    function-type
-                                    updated-symbols)
-            with-body-symbols (typecheck-block (:return-type function-type)
-                                               body
-                                               (assoc with-parameter-symbols
-                                                      :at-top-level false))]
-        {:declaration (assoc d :body (:block with-body-symbols))
-         :ident->symbol (assoc (:ident->symbol with-body-symbols)
-                               :at-top-level true)})
-      {:declaration d
-       :ident->symbol updated-symbols})))
-
-(defn- typecheck-declaration
-  [{:keys [declaration-type] :as d} ident->symbol]
-  (let [at-top-level? (:at-top-level ident->symbol)]
-    (condp = declaration-type
-      :variable (if at-top-level?
-                  (typecheck-file-scope-variable-declaration d ident->symbol)
-                  (typecheck-local-scope-variable-declaration d ident->symbol))
-      :function (typecheck-function-declaration d ident->symbol)
-      (exc/analyzer-error "Invalid declaration for typechecker." {:declaration d}))))
-
-(defn- typecheck-program [program]
-  (let [rf (fn [acc decl]
-             (let [d (typecheck-declaration decl (:ident->symbol acc))]
-               {:program (conj (:program acc) (:declaration d))
-                :ident->symbol (:ident->symbol d)}))]
-    (reduce rf
-            {:program []
-             :ident->symbol {:at-top-level true}}
-            program)))
-
-(defn typecheck
-  "Typechecks given program.
-
-  A program is a list of declarations."
-  [program]
-  (let [v (typecheck-program program)
-        program (:program v)
-        m (dissoc (:ident->symbol v) :at-top-level)
-        ;_ (m/coerce s/Program program)
-        ;_ (m/coerce s/SymbolMap m)
-        ]
-    {:program program
-     :ident->symbol m}))
-
-(comment
-
-  (def file-path "./test-programs/example.c")
-
-  (slurp "./test-programs/example.c")
-
-  (-> file-path
-      slurp
-      p/parse-from-src)
-
-  (-> file-path
-      slurp
-      p/parse-from-src
-      r/resolve-program
-      l/label-loops
-      typecheck)
-
-  (->
-   "unsigned long ul = 18446744073709549568.;"
-   p/parse-from-src
-   r/resolve-program
-   l/label-loops
-   typecheck)
-
-  (pretty/explain
-   s/TypecheckedOut
-   (-> file-path
-       slurp
-       p/parse-from-src
-       r/resolve-program
-       l/label-loops
-       typecheck))
-
-  ())