1 files changed, 0 insertions, 183 deletions
diff --git a/src/ast/branch-utils.h b/src/ast/branch-utils.h
deleted file mode 100644
index d574945ef..000000000
--- a/src/ast/branch-utils.h
+++ /dev/null
@@ -1,183 +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_branch_h
-#define wasm_ast_branch_h
-
-#include "wasm.h"
-#include "wasm-traversal.h"
-
-namespace wasm {
-
-namespace BranchUtils {
-
-// Some branches are obviously not actually reachable (e.g. (br $out (unreachable)))
-
-inline bool isBranchReachable(Break* br) {
-  return !(br->value     && br->value->type     == unreachable) &&
-         !(br->condition && br->condition->type == unreachable);
-}
-
-inline bool isBranchReachable(Switch* sw) {
-  return !(sw->value && sw->value->type     == unreachable) &&
-                        sw->condition->type != unreachable;
-}
-
-inline bool isBranchReachable(Expression* expr) {
-  if (auto* br = expr->dynCast<Break>()) {
-    return isBranchReachable(br);
-  } else if (auto* sw = expr->dynCast<Switch>()) {
-    return isBranchReachable(sw);
-  }
-  WASM_UNREACHABLE();
-}
-
-// returns the set of targets to which we branch that are
-// outside of a node
-inline std::set<Name> getExitingBranches(Expression* ast) {
-  struct Scanner : public PostWalker<Scanner> {
-    std::set<Name> targets;
-
-    void visitBreak(Break* curr) {
-      targets.insert(curr->name);
-    }
-    void visitSwitch(Switch* curr) {
-      for (auto target : targets) {
-        targets.insert(target);
-      }
-      targets.insert(curr->default_);
-    }
-    void visitBlock(Block* curr) {
-      if (curr->name.is()) {
-        targets.erase(curr->name);
-      }
-    }
-    void visitLoop(Loop* curr) {
-      if (curr->name.is()) {
-        targets.erase(curr->name);
-      }
-    }
-  };
-  Scanner scanner;
-  scanner.walk(ast);
-  // anything not erased is a branch out
-  return scanner.targets;
-}
-
-// returns the list of all branch targets in a node
-
-inline std::set<Name> getBranchTargets(Expression* ast) {
-  struct Scanner : public PostWalker<Scanner> {
-    std::set<Name> targets;
-
-    void visitBlock(Block* curr) {
-      if (curr->name.is()) {
-        targets.insert(curr->name);
-      }
-    }
-    void visitLoop(Loop* curr) {
-      if (curr->name.is()) {
-        targets.insert(curr->name);
-      }
-    }
-  };
-  Scanner scanner;
-  scanner.walk(ast);
-  return scanner.targets;
-}
-
-// Finds if there are branches targeting a name. Note that since names are
-// unique in our IR, we just need to look for the name, and do not need
-// to analyze scoping.
-// By default we consider all branches, so any place there is a branch that
-// names the target. You can unset 'named' to only note branches that appear
-// reachable (i.e., are not obviously unreachable).
-struct BranchSeeker : public PostWalker<BranchSeeker> {
-  Name target;
-  bool named = true;
-
-  Index found;
-  WasmType valueType;
-
-  BranchSeeker(Name target) : target(target), found(0) {}
-
-  void noteFound(Expression* value) {
-    found++;
-    if (found == 1) valueType = unreachable;
-    if (!value) valueType = none;
-    else if (value->type != unreachable) valueType = value->type;
-  }
-
-  void visitBreak(Break *curr) {
-    if (!named) {
-      // ignore an unreachable break
-      if (curr->condition && curr->condition->type == unreachable) return;
-      if (curr->value && curr->value->type == unreachable) return;
-    }
-    // check the break
-    if (curr->name == target) noteFound(curr->value);
-  }
-
-  void visitSwitch(Switch *curr) {
-    if (!named) {
-      // ignore an unreachable switch
-      if (curr->condition->type == unreachable) return;
-      if (curr->value && curr->value->type == unreachable) return;
-    }
-    // check the switch
-    for (auto name : curr->targets) {
-      if (name == target) noteFound(curr->value);
-    }
-    if (curr->default_ == target) noteFound(curr->value);
-  }
-
-  static bool hasReachable(Expression* tree, Name target) {
-    if (!target.is()) return false;
-    BranchSeeker seeker(target);
-    seeker.named = false;
-    seeker.walk(tree);
-    return seeker.found > 0;
-  }
-
-  static Index countReachable(Expression* tree, Name target) {
-    if (!target.is()) return 0;
-    BranchSeeker seeker(target);
-    seeker.named = false;
-    seeker.walk(tree);
-    return seeker.found;
-  }
-
-  static bool hasNamed(Expression* tree, Name target) {
-    if (!target.is()) return false;
-    BranchSeeker seeker(target);
-    seeker.walk(tree);
-    return seeker.found > 0;
-  }
-
-  static Index countNamed(Expression* tree, Name target) {
-    if (!target.is()) return 0;
-    BranchSeeker seeker(target);
-    seeker.walk(tree);
-    return seeker.found;
-  }
-};
-
-} // namespace BranchUtils
-
-} // namespace wasm
-
-#endif // wasm_ast_branch_h
-