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diff --git a/js/src/wasm/WasmBaselineCompile.h b/js/src/wasm/WasmBaselineCompile.h
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+++ b/js/src/wasm/WasmBaselineCompile.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ *
+ * Copyright 2016 Mozilla Foundation
+ *
+ * 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 asmjs_wasm_baseline_compile_h
+#define asmjs_wasm_baseline_compile_h
+
+#include "jit/ABIArgGenerator.h"
+#include "wasm/WasmGenerator.h"
+
+namespace js {
+namespace wasm {
+
+// Return whether BaselineCompileFunction can generate code on the current
+// device.  Usually you do *not* want to call this, you want
+// BaselineAvailable().
+[[nodiscard]] bool BaselinePlatformSupport();
+
+// Generate adequate code quickly.
+[[nodiscard]] bool BaselineCompileFunctions(
+    const ModuleEnvironment& moduleEnv, const CompilerEnvironment& compilerEnv,
+    LifoAlloc& lifo, const FuncCompileInputVector& inputs, CompiledCode* code,
+    UniqueChars* error);
+
+// BaseLocalIter iterates over a vector of types of locals and provides offsets
+// from the Frame address for those locals, and associated data.
+//
+// The implementation of BaseLocalIter is the property of the BaseStackFrame.
+// But it is also exposed for eg the debugger to use.
+class BaseLocalIter {
+ private:
+  using ConstValTypeRange = mozilla::Range<const ValType>;
+
+  const ValTypeVector& locals_;
+  const ArgTypeVector& args_;
+  jit::WasmABIArgIter<ArgTypeVector> argsIter_;
+  size_t index_;
+  int32_t frameSize_;
+  int32_t nextFrameSize_;
+  int32_t frameOffset_;
+  int32_t stackResultPointerOffset_;
+  jit::MIRType mirType_;
+  bool done_;
+
+  void settle();
+  int32_t pushLocal(size_t nbytes);
+
+ public:
+  BaseLocalIter(const ValTypeVector& locals, const ArgTypeVector& args,
+                bool debugEnabled);
+  void operator++(int);
+  bool done() const { return done_; }
+
+  jit::MIRType mirType() const {
+    MOZ_ASSERT(!done_);
+    return mirType_;
+  }
+  int32_t frameOffset() const {
+    MOZ_ASSERT(!done_);
+    MOZ_ASSERT(frameOffset_ != INT32_MAX);
+    return frameOffset_;
+  }
+  size_t index() const {
+    MOZ_ASSERT(!done_);
+    return index_;
+  }
+  // The size in bytes taken up by the previous `index_` locals, also including
+  // fixed allocations like the DebugFrame and "hidden" locals like a spilled
+  // stack results pointer.
+  int32_t frameSize() const { return frameSize_; }
+
+  int32_t stackResultPointerOffset() const {
+    MOZ_ASSERT(args_.hasSyntheticStackResultPointerArg());
+    MOZ_ASSERT(stackResultPointerOffset_ != INT32_MAX);
+    return stackResultPointerOffset_;
+  }
+
+#ifdef DEBUG
+  bool isArg() const {
+    MOZ_ASSERT(!done_);
+    return !argsIter_.done();
+  }
+#endif
+};
+
+}  // namespace wasm
+}  // namespace js
+
+#endif  // asmjs_wasm_baseline_compile_h