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diff --git a/src/ast/local-graph.h b/src/ast/local-graph.h
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--- a/src/ast/local-graph.h
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@@ -1,111 +0,0 @@
-/*
- * Copyright 2017 WebAssembly Community Group participants
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef wasm_ast_local_graph_h
-#define wasm_ast_local_graph_h
-
-namespace wasm {
-
-//
-// Finds the connections between get_locals and set_locals, creating
-// a graph of those ties. This is useful for "ssa-style" optimization,
-// in which you want to know exactly which sets are relevant for a
-// a get, so it is as if each get has just one set, logically speaking
-// (see the SSA pass for actually creating new local indexes based
-// on this).
-//
-// TODO: the algorithm here is pretty simple, but also pretty slow,
-//       we should optimize it. e.g. we rely on set_interaction
-//       here, and worse we only use it to compute the size...
-struct LocalGraph : public PostWalker<LocalGraph> {
-  // main API
-
-  // the constructor computes getSetses, the sets affecting each get
-  LocalGraph(Function* func, Module* module);
-
-  // the set_locals relevant for an index or a get.
-  typedef std::set<SetLocal*> Sets;
-
-  // externally useful information
-  std::map<GetLocal*, Sets> getSetses; // the sets affecting each get. a nullptr set means the initial
-                                       // value (0 for a var, the received value for a param)
-  std::map<Expression*, Expression**> locations; // where each get and set is (for easy replacing)
-
-  // optional computation: compute the influence graphs between sets and gets
-  // (useful for algorithms that propagate changes)
-
-  std::unordered_map<GetLocal*, std::unordered_set<SetLocal*>> getInfluences; // for each get, the sets whose values are influenced by that get
-  std::unordered_map<SetLocal*, std::unordered_set<GetLocal*>> setInfluences; // for each set, the gets whose values are influenced by that set
-
-  void computeInfluences();
-
-private:
-  // we map local index => the set_locals for that index.
-  // a nullptr set means there is a virtual set, from a param
-  // initial value or the zero init initial value.
-  typedef std::vector<Sets> Mapping;
-
-  // internal state
-  Index numLocals;
-  Mapping currMapping;
-  std::vector<Mapping> mappingStack; // used in ifs, loops
-  std::map<Name, std::vector<Mapping>> breakMappings; // break target => infos that reach it
-  std::vector<std::vector<GetLocal*>> loopGetStack; //  stack of loops, all the gets in each, so we can update them for back branches
-
-public:
-  void doWalkFunction(Function* func);
-
-  // control flow
-
-  void visitBlock(Block* curr);
-
-  void finishIf();
-
-  static void afterIfCondition(LocalGraph* self, Expression** currp);
-  static void afterIfTrue(LocalGraph* self, Expression** currp);
-  static void afterIfFalse(LocalGraph* self, Expression** currp);
-  static void beforeLoop(LocalGraph* self, Expression** currp);
-  void visitLoop(Loop* curr);
-  void visitBreak(Break* curr);
-  void visitSwitch(Switch* curr);
-  void visitReturn(Return *curr);
-  void visitUnreachable(Unreachable *curr);
-
-  // local usage
-
-  void visitGetLocal(GetLocal* curr);
-  void visitSetLocal(SetLocal* curr);
-
-  // traversal
-
-  static void scan(LocalGraph* self, Expression** currp);
-
-  // helpers
-
-  void setUnreachable(Mapping& mapping);
-
-  bool isUnreachable(Mapping& mapping);
-
-  // merges a bunch of infos into one.
-  // if we need phis, writes them into the provided vector. the caller should
-  // ensure those are placed in the right location
-  Mapping& merge(std::vector<Mapping>& mappings);
-};
-
-} // namespace wasm
-
-#endif // wasm_ast_local_graph_h
-