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diff --git a/js/src/builtin/RegExp.h b/js/src/builtin/RegExp.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/. */
+
+#ifndef builtin_RegExp_h
+#define builtin_RegExp_h
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "NamespaceImports.h"
+
+#include "js/PropertySpec.h"
+#include "js/RootingAPI.h"
+#include "js/TypeDecls.h"
+#include "vm/RegExpShared.h"
+
+class JSLinearString;
+
+namespace JS {
+class Value;
+}
+
+/*
+ * The following builtin natives are extern'd for pointer comparison in
+ * other parts of the engine.
+ */
+
+namespace js {
+
+class ArrayObject;
+class MatchPairs;
+class RegExpObject;
+class RegExpStatics;
+
+JSObject* InitRegExpClass(JSContext* cx, HandleObject obj);
+
+/*
+ * Legacy behavior of ExecuteRegExp(), which is baked into the JSAPI.
+ *
+ * |res| may be nullptr if the RegExpStatics are not to be updated.
+ * |input| may be nullptr if there is no JSString corresponding to
+ * |chars| and |length|.
+ */
+[[nodiscard]] bool ExecuteRegExpLegacy(JSContext* cx, RegExpStatics* res,
+ Handle<RegExpObject*> reobj,
+ Handle<JSLinearString*> input,
+ size_t* lastIndex, bool test,
+ MutableHandleValue rval);
+
+// Translation from MatchPairs to a JS array in regexp_exec()'s output format.
+[[nodiscard]] bool CreateRegExpMatchResult(JSContext* cx, HandleRegExpShared re,
+ HandleString input,
+ const MatchPairs& matches,
+ MutableHandleValue rval);
+
+[[nodiscard]] extern bool RegExpMatcher(JSContext* cx, unsigned argc,
+ Value* vp);
+
+[[nodiscard]] extern bool RegExpMatcherRaw(JSContext* cx, HandleObject regexp,
+ HandleString input,
+ int32_t lastIndex,
+ MatchPairs* maybeMatches,
+ MutableHandleValue output);
+
+[[nodiscard]] extern bool RegExpSearcher(JSContext* cx, unsigned argc,
+ Value* vp);
+
+[[nodiscard]] extern bool RegExpSearcherRaw(JSContext* cx, HandleObject regexp,
+ HandleString input,
+ int32_t lastIndex,
+ MatchPairs* maybeMatches,
+ int32_t* result);
+
+[[nodiscard]] extern bool RegExpSearcherLastLimit(JSContext* cx, unsigned argc,
+ Value* vp);
+
+[[nodiscard]] extern bool RegExpBuiltinExecMatchFromJit(
+ JSContext* cx, Handle<RegExpObject*> regexp, HandleString input,
+ MatchPairs* maybeMatches, MutableHandleValue output);
+
+[[nodiscard]] extern bool RegExpBuiltinExecTestFromJit(
+ JSContext* cx, Handle<RegExpObject*> regexp, HandleString input,
+ bool* result);
+
+[[nodiscard]] extern bool intrinsic_GetElemBaseForLambda(JSContext* cx,
+ unsigned argc,
+ Value* vp);
+
+[[nodiscard]] extern bool intrinsic_GetStringDataProperty(JSContext* cx,
+ unsigned argc,
+ Value* vp);
+
+/*
+ * The following functions are for use by self-hosted code.
+ */
+
+/*
+ * Behaves like RegExp(source, flags).
+ * |source| must be a valid regular expression pattern, |flags| is a raw
+ * integer value representing the regular expression flags.
+ * Must be called without |new|.
+ *
+ * Dedicated function for RegExp.prototype[@@replace] and
+ * RegExp.prototype[@@split] optimized paths.
+ */
+[[nodiscard]] extern bool regexp_construct_raw_flags(JSContext* cx,
+ unsigned argc, Value* vp);
+
+[[nodiscard]] extern bool IsRegExp(JSContext* cx, HandleValue value,
+ bool* result);
+
+[[nodiscard]] extern bool RegExpCreate(JSContext* cx, HandleValue pattern,
+ HandleValue flags,
+ MutableHandleValue rval);
+
+[[nodiscard]] extern bool RegExpPrototypeOptimizable(JSContext* cx,
+ unsigned argc, Value* vp);
+
+[[nodiscard]] extern bool RegExpPrototypeOptimizableRaw(JSContext* cx,
+ JSObject* proto);
+
+[[nodiscard]] extern bool RegExpInstanceOptimizable(JSContext* cx,
+ unsigned argc, Value* vp);
+
+[[nodiscard]] extern bool RegExpInstanceOptimizableRaw(JSContext* cx,
+ JSObject* obj,
+ JSObject* proto);
+
+[[nodiscard]] extern bool RegExpBuiltinExec(JSContext* cx,
+ Handle<RegExpObject*> regexp,
+ Handle<JSString*> string,
+ bool forTest,
+ MutableHandle<Value> rval);
+
+[[nodiscard]] extern bool RegExpExec(JSContext* cx, Handle<JSObject*> regexp,
+ Handle<JSString*> string, bool forTest,
+ MutableHandle<Value> rval);
+
+[[nodiscard]] extern bool RegExpGetSubstitution(
+ JSContext* cx, Handle<ArrayObject*> matchResult,
+ Handle<JSLinearString*> string, size_t position,
+ Handle<JSLinearString*> replacement, size_t firstDollarIndex,
+ HandleValue namedCaptures, MutableHandleValue rval);
+
+[[nodiscard]] extern bool RegExpHasCaptureGroups(JSContext* cx,
+ Handle<RegExpObject*> obj,
+ Handle<JSString*> input,
+ bool* result);
+
+[[nodiscard]] extern bool GetFirstDollarIndex(JSContext* cx, unsigned argc,
+ Value* vp);
+
+[[nodiscard]] extern bool GetFirstDollarIndexRaw(JSContext* cx, JSString* str,
+ int32_t* index);
+
+extern int32_t GetFirstDollarIndexRawFlat(JSLinearString* text);
+
+// RegExp ClassSpec members used in RegExpObject.cpp.
+[[nodiscard]] extern bool regexp_construct(JSContext* cx, unsigned argc,
+ Value* vp);
+extern const JSPropertySpec regexp_static_props[];
+extern const JSPropertySpec regexp_properties[];
+extern const JSFunctionSpec regexp_methods[];
+
+// Used in RegExpObject::isOriginalFlagGetter.
+[[nodiscard]] extern bool regexp_hasIndices(JSContext* cx, unsigned argc,
+ JS::Value* vp);
+[[nodiscard]] extern bool regexp_global(JSContext* cx, unsigned argc,
+ JS::Value* vp);
+[[nodiscard]] extern bool regexp_ignoreCase(JSContext* cx, unsigned argc,
+ JS::Value* vp);
+[[nodiscard]] extern bool regexp_multiline(JSContext* cx, unsigned argc,
+ JS::Value* vp);
+[[nodiscard]] extern bool regexp_dotAll(JSContext* cx, unsigned argc,
+ JS::Value* vp);
+[[nodiscard]] extern bool regexp_sticky(JSContext* cx, unsigned argc,
+ JS::Value* vp);
+[[nodiscard]] extern bool regexp_unicode(JSContext* cx, unsigned argc,
+ JS::Value* vp);
+[[nodiscard]] extern bool regexp_unicodeSets(JSContext* cx, unsigned argc,
+ JS::Value* vp);
+
+#ifdef DEBUG
+// Sentinel value for cx->regExpSearcherLastLimit.
+constexpr uint32_t RegExpSearcherLastLimitSentinel = UINT32_MAX;
+#endif
+
+} /* namespace js */
+
+#endif /* builtin_RegExp_h */