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diff --git a/js/src/builtin/SelfHostingDefines.h b/js/src/builtin/SelfHostingDefines.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/. */
+
+// Specialized .h file to be used by both JS and C++ code.
+
+#ifndef builtin_SelfHostingDefines_h
+#define builtin_SelfHostingDefines_h
+
+// Utility macros.
+#define TO_INT32(x) ((x) | 0)
+#define TO_UINT32(x) ((x) >>> 0)
+#define IS_UINT32(x) ((x) >>> 0 == = (x))
+#define MAX_UINT32 0xffffffff
+#define MAX_NUMERIC_INDEX 0x1fffffffffffff // == Math.pow(2, 53) - 1
+
+// Unforgeable version of Function.prototype.apply.
+#define FUN_APPLY(FUN, RECEIVER, ARGS) \
+ callFunction(std_Function_apply, FUN, RECEIVER, ARGS)
+
+// NB: keep this in sync with the copy in vm/ArgumentsObject.h.
+#define MAX_ARGS_LENGTH (500 * 1000)
+
+// NB: keep this in sync with JS::MaxStringLength in js/public/String.h.
+#define MAX_STRING_LENGTH ((1 << 30) - 2)
+
+// Spread non-empty argument list of up to 15 elements.
+#define SPREAD(v, n) SPREAD_##n(v)
+#define SPREAD_1(v) v[0]
+#define SPREAD_2(v) SPREAD_1(v), v[1]
+#define SPREAD_3(v) SPREAD_2(v), v[2]
+#define SPREAD_4(v) SPREAD_3(v), v[3]
+#define SPREAD_5(v) SPREAD_4(v), v[4]
+#define SPREAD_6(v) SPREAD_5(v), v[5]
+#define SPREAD_7(v) SPREAD_6(v), v[6]
+#define SPREAD_8(v) SPREAD_7(v), v[7]
+#define SPREAD_9(v) SPREAD_8(v), v[8]
+#define SPREAD_10(v) SPREAD_9(v), v[9]
+#define SPREAD_11(v) SPREAD_10(v), v[10]
+#define SPREAD_12(v) SPREAD_11(v), v[11]
+#define SPREAD_13(v) SPREAD_12(v), v[12]
+#define SPREAD_14(v) SPREAD_13(v), v[13]
+#define SPREAD_15(v) SPREAD_14(v), v[14]
+
+// Property descriptor attributes.
+#define ATTR_ENUMERABLE 0x01
+#define ATTR_CONFIGURABLE 0x02
+#define ATTR_WRITABLE 0x04
+
+#define ATTR_NONENUMERABLE 0x08
+#define ATTR_NONCONFIGURABLE 0x10
+#define ATTR_NONWRITABLE 0x20
+
+// Property descriptor kind, must be different from the descriptor attributes.
+#define DATA_DESCRIPTOR_KIND 0x100
+#define ACCESSOR_DESCRIPTOR_KIND 0x200
+
+// Property descriptor array indices.
+#define PROP_DESC_ATTRS_AND_KIND_INDEX 0
+#define PROP_DESC_VALUE_INDEX 1
+#define PROP_DESC_GETTER_INDEX 1
+#define PROP_DESC_SETTER_INDEX 2
+
+// The extended slot of cloned self-hosted function, in which the self-hosted
+// name for self-hosted builtins is stored.
+#define LAZY_FUNCTION_NAME_SLOT 0
+
+#define ITERATOR_SLOT_TARGET 0
+// Used for collection iterators.
+#define ITERATOR_SLOT_RANGE 1
+// Used for list, i.e. Array and String, iterators.
+#define ITERATOR_SLOT_NEXT_INDEX 1
+#define ITERATOR_SLOT_ITEM_KIND 2
+
+#define ITEM_KIND_KEY 0
+#define ITEM_KIND_VALUE 1
+#define ITEM_KIND_KEY_AND_VALUE 2
+
+#define REGEXP_SOURCE_SLOT 1
+#define REGEXP_FLAGS_SLOT 2
+
+#define REGEXP_IGNORECASE_FLAG 0x01
+#define REGEXP_GLOBAL_FLAG 0x02
+#define REGEXP_MULTILINE_FLAG 0x04
+#define REGEXP_STICKY_FLAG 0x08
+#define REGEXP_UNICODE_FLAG 0x10
+#define REGEXP_DOTALL_FLAG 0x20
+#define REGEXP_HASINDICES_FLAG 0x40
+#define REGEXP_UNICODESETS_FLAG 0x80
+
+#define REGEXP_STRING_ITERATOR_REGEXP_SLOT 0
+#define REGEXP_STRING_ITERATOR_STRING_SLOT 1
+#define REGEXP_STRING_ITERATOR_SOURCE_SLOT 2
+#define REGEXP_STRING_ITERATOR_FLAGS_SLOT 3
+#define REGEXP_STRING_ITERATOR_LASTINDEX_SLOT 4
+
+#define REGEXP_STRING_ITERATOR_LASTINDEX_DONE -1
+#define REGEXP_STRING_ITERATOR_LASTINDEX_SLOW -2
+
+#define DATE_METHOD_LOCALE_TIME_STRING 0
+#define DATE_METHOD_LOCALE_DATE_STRING 1
+#define DATE_METHOD_LOCALE_STRING 2
+
+#define INTL_INTERNALS_OBJECT_SLOT 0
+#define INTL_SEGMENTS_STRING_SLOT 1
+#define INTL_SEGMENT_ITERATOR_STRING_SLOT 1
+#define INTL_SEGMENT_ITERATOR_INDEX_SLOT 3
+
+#define TYPEDARRAY_KIND_INT8 0
+#define TYPEDARRAY_KIND_UINT8 1
+#define TYPEDARRAY_KIND_INT16 2
+#define TYPEDARRAY_KIND_UINT16 3
+#define TYPEDARRAY_KIND_INT32 4
+#define TYPEDARRAY_KIND_UINT32 5
+#define TYPEDARRAY_KIND_FLOAT32 6
+#define TYPEDARRAY_KIND_FLOAT64 7
+#define TYPEDARRAY_KIND_UINT8CLAMPED 8
+#define TYPEDARRAY_KIND_BIGINT64 9
+#define TYPEDARRAY_KIND_BIGUINT64 10
+
+#define WRAP_FOR_VALID_ITERATOR_ITERATOR_SLOT 0
+#define WRAP_FOR_VALID_ITERATOR_NEXT_METHOD_SLOT 1
+
+#define ITERATOR_HELPER_GENERATOR_SLOT 0
+
+#define ASYNC_ITERATOR_HELPER_GENERATOR_SLOT 0
+
+#endif