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diff --git a/js/public/friend/DumpFunctions.h b/js/public/friend/DumpFunctions.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:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Functions to print out values during debugging. */
+
+#ifndef js_friend_DumpFunctions_h
+#define js_friend_DumpFunctions_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/MemoryReporting.h"  // mozilla::MallocSizeOf
+
+#include <stddef.h>  // size_t
+#include <stdio.h>   // FILE
+
+#include "jstypes.h"  // JS_PUBLIC_API
+
+#include "js/Printer.h"  // js::GenericPrinter
+#include "js/Utility.h"  // JS::UniqueChars
+
+class JS_PUBLIC_API JSAtom;
+struct JS_PUBLIC_API JSContext;
+class JS_PUBLIC_API JSObject;
+class JS_PUBLIC_API JSScript;
+class JS_PUBLIC_API JSString;
+
+namespace JS {
+
+class JS_PUBLIC_API BigInt;
+class JS_PUBLIC_API PropertyKey;
+class JS_PUBLIC_API Value;
+
+}  // namespace JS
+
+namespace js {
+
+class InterpreterFrame;
+
+}  // namespace js
+
+namespace JS {
+
+/** Exposed for DumpJSStack */
+extern JS_PUBLIC_API JS::UniqueChars FormatStackDump(JSContext* cx,
+                                                     bool showArgs,
+                                                     bool showLocals,
+                                                     bool showThisProps);
+
+}  // namespace JS
+
+namespace js {
+
+/*
+ * These functions are FRIEND_API to help the debugger find them and to support
+ * temporarily hacking js::Dump* calls into other code.  Note that there are
+ * overloads that do not require the FILE* parameter, which will default to
+ * stderr.
+ *
+ * These functions are no-ops unless built with DEBUG or JS_JITSPEW.
+ */
+
+extern JS_PUBLIC_API void DumpString(JSString* str, FILE* fp);
+
+extern JS_PUBLIC_API void DumpAtom(JSAtom* atom, FILE* fp);
+
+extern JS_PUBLIC_API void DumpObject(JSObject* obj, FILE* fp);
+
+extern JS_PUBLIC_API void DumpChars(const char16_t* s, size_t n, FILE* fp);
+
+// DumpBigInt() outputs the value in decimal if it fits within a 64-bit int, and
+// otherwise in hex, prefixed with "0x". In both cases the "n" is appended.
+extern JS_PUBLIC_API void DumpBigInt(JS::BigInt* bi, FILE* fp);
+
+extern JS_PUBLIC_API void DumpValue(const JS::Value& val, FILE* fp);
+
+extern JS_PUBLIC_API void DumpId(JS::PropertyKey id, FILE* fp);
+
+extern JS_PUBLIC_API bool DumpPC(JSContext* cx, FILE* fp);
+
+extern JS_PUBLIC_API bool DumpScript(JSContext* cx, JSScript* scriptArg,
+                                     FILE* fp);
+
+// Versions for use directly in a debugger (default parameters are not handled
+// well in gdb; built-in handles like stderr are not handled well in lldb.)
+extern JS_PUBLIC_API void DumpString(JSString* str);
+extern JS_PUBLIC_API void DumpAtom(JSAtom* atom);
+extern JS_PUBLIC_API void DumpObject(JSObject* obj);
+extern JS_PUBLIC_API void DumpChars(const char16_t* s, size_t n);
+extern JS_PUBLIC_API void DumpBigInt(JS::BigInt* bi);
+extern JS_PUBLIC_API void DumpValue(const JS::Value& val);
+extern JS_PUBLIC_API void DumpId(JS::PropertyKey id);
+extern JS_PUBLIC_API void DumpInterpreterFrame(
+    JSContext* cx, InterpreterFrame* start = nullptr);
+extern JS_PUBLIC_API bool DumpPC(JSContext* cx);
+extern JS_PUBLIC_API bool DumpScript(JSContext* cx, JSScript* scriptArg);
+
+// DumpBacktrace(), unlike the other dump functions, always dumps a backtrace --
+// regardless of DEBUG or JS_JITSPEW.
+
+extern JS_PUBLIC_API void DumpBacktrace(JSContext* cx, FILE* fp);
+
+extern JS_PUBLIC_API void DumpBacktrace(JSContext* cx, GenericPrinter& out);
+
+extern JS_PUBLIC_API void DumpBacktrace(JSContext* cx);
+
+enum DumpHeapNurseryBehaviour {
+  CollectNurseryBeforeDump,
+  IgnoreNurseryObjects
+};
+
+/**
+ * Dump the complete object graph of heap-allocated things.
+ * fp is the file for the dump output.
+ */
+extern JS_PUBLIC_API void DumpHeap(
+    JSContext* cx, FILE* fp, DumpHeapNurseryBehaviour nurseryBehaviour,
+    mozilla::MallocSizeOf mallocSizeOf = nullptr);
+
+extern JS_PUBLIC_API void DumpFmt(FILE* fp, const char* fmt, ...)
+    MOZ_FORMAT_PRINTF(2, 3);
+extern JS_PUBLIC_API void DumpFmt(const char* fmt, ...) MOZ_FORMAT_PRINTF(1, 2);
+
+}  // namespace js
+
+#endif  // js_friend_DumpFunctions_h