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diff --git a/src/analysis/cfg.h b/src/analysis/cfg.h
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+/*
+ * Copyright 2023 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.
+ */
+
+// A generic CFG / basic block utility. Unlike the utilities in src/cfg/, this
+// is a generic representation of a CFG rather than a generic builder of
+// CFG-like objects. It lives here in src/analysis/ because it is primarily
+// meant for use in the static analysis framework. Other Binaryen code will find
+// it more idiomatic to use the utilities in src/cfg/.
+
+#ifndef wasm_analysis_cfg_h
+#define wasm_analysis_cfg_h
+
+#include <iostream>
+#include <vector>
+
+#include "wasm.h"
+
+namespace wasm::analysis {
+
+struct BasicBlock;
+
+struct CFG {
+  // Iterate through basic blocks.
+  using iterator = std::vector<BasicBlock>::const_iterator;
+  iterator begin() const { return blocks.cbegin(); }
+  iterator end() const { return blocks.cend(); }
+  size_t size() const { return blocks.size(); }
+
+  static CFG fromFunction(Function* func);
+
+  void print(std::ostream& os, Module* wasm = nullptr) const;
+
+private:
+  std::vector<BasicBlock> blocks;
+  friend BasicBlock;
+};
+
+struct BasicBlock {
+  using iterator = std::vector<Expression*>::const_iterator;
+
+  // Iterate through instructions.
+  iterator begin() const { return insts.cbegin(); }
+  iterator end() const { return insts.cend(); }
+  size_t size() const { return insts.size(); }
+
+  // Iterables for predecessor and successor blocks.
+  struct Predecessors;
+  struct Successors;
+  Predecessors preds() const;
+  Successors succs() const;
+
+  void print(std::ostream& os, Module* wasm = nullptr, size_t start = 0) const;
+
+private:
+  Index index;
+  std::vector<Expression*> insts;
+  std::vector<BasicBlock*> predecessors;
+  std::vector<BasicBlock*> successors;
+  friend CFG;
+};
+
+} // namespace wasm::analysis
+
+#include "cfg-impl.h"
+
+#endif // wasm_analysis_cfg_h