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diff --git a/js/src/wasm/WasmProcess.h b/js/src/wasm/WasmProcess.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 2017 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 wasm_process_h
+#define wasm_process_h
+
+#include "mozilla/Atomics.h"
+
+#include "wasm/WasmMemory.h"
+
+namespace js {
+namespace wasm {
+
+class Code;
+class CodeRange;
+class CodeSegment;
+
+// These methods return the wasm::CodeSegment (resp. wasm::Code) containing
+// the given pc, if any exist in the process. These methods do not take a lock,
+// and thus are safe to use in a profiling context.
+
+const CodeSegment* LookupCodeSegment(const void* pc,
+                                     const CodeRange** codeRange = nullptr);
+
+const Code* LookupCode(const void* pc, const CodeRange** codeRange = nullptr);
+
+// Return whether the given PC is in any type of wasm code (module or builtin).
+
+bool InCompiledCode(void* pc);
+
+// A bool member that can be used as a very fast lookup to know if there is any
+// code segment at all.
+
+extern mozilla::Atomic<bool> CodeExists;
+
+// These methods allow to (un)register CodeSegments so they can be looked up
+// via pc in the methods described above.
+
+bool RegisterCodeSegment(const CodeSegment* cs);
+
+void UnregisterCodeSegment(const CodeSegment* cs);
+
+// Whether this process is configured to use huge memory or not.  Note that this
+// is not precise enough to tell whether a particular memory uses huge memory,
+// there are additional conditions for that.
+
+bool IsHugeMemoryEnabled(IndexType t);
+
+[[nodiscard]] bool DisableHugeMemory();
+
+// Called once before/after the last VM execution which could execute or compile
+// wasm.
+
+bool Init();
+
+void ShutDown();
+
+}  // namespace wasm
+}  // namespace js
+
+#endif  // wasm_process_h