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-rw-r--r--js/src/vm/JSAtom-inl.h157
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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 vm_JSAtom_inl_h
+#define vm_JSAtom_inl_h
+
+#include "vm/JSAtom.h"
+
+#include "mozilla/RangedPtr.h"
+
+#include "jsnum.h"
+
+#include "gc/MaybeRooted.h"
+#include "vm/JSAtomState.h"
+#include "vm/JSContext.h"
+#include "vm/StringType.h"
+
+namespace js {
+
+MOZ_ALWAYS_INLINE jsid AtomToId(JSAtom* atom) {
+ static_assert(JS::PropertyKey::IntMin == 0);
+
+ uint32_t index;
+ if (atom->isIndex(&index) && index <= JS::PropertyKey::IntMax) {
+ return JS::PropertyKey::Int(int32_t(index));
+ }
+
+ return JS::PropertyKey::NonIntAtom(atom);
+}
+
+// Use the NameToId method instead!
+inline jsid AtomToId(PropertyName* name) = delete;
+
+template <AllowGC allowGC>
+extern bool PrimitiveValueToIdSlow(
+ JSContext* cx, typename MaybeRooted<JS::Value, allowGC>::HandleType v,
+ typename MaybeRooted<jsid, allowGC>::MutableHandleType idp);
+
+template <AllowGC allowGC>
+inline bool PrimitiveValueToId(
+ JSContext* cx, typename MaybeRooted<Value, allowGC>::HandleType v,
+ typename MaybeRooted<jsid, allowGC>::MutableHandleType idp) {
+ // Non-primitive values should call ToPropertyKey.
+ MOZ_ASSERT(v.isPrimitive());
+
+ if (v.isString()) {
+ JSAtom* atom;
+ if (v.toString()->isAtom()) {
+ atom = &v.toString()->asAtom();
+ } else {
+ atom = AtomizeString(cx, v.toString());
+ if (!atom) {
+ if constexpr (!allowGC) {
+ cx->recoverFromOutOfMemory();
+ }
+ return false;
+ }
+ }
+ idp.set(AtomToId(atom));
+ return true;
+ }
+
+ if (v.isInt32()) {
+ if (PropertyKey::fitsInInt(v.toInt32())) {
+ idp.set(PropertyKey::Int(v.toInt32()));
+ return true;
+ }
+ } else if (v.isSymbol()) {
+ idp.set(PropertyKey::Symbol(v.toSymbol()));
+ return true;
+ }
+
+ return PrimitiveValueToIdSlow<allowGC>(cx, v, idp);
+}
+
+/*
+ * Write out character representing |index| to the memory just before |end|.
+ * Thus |*end| is not touched, but |end[-1]| and earlier are modified as
+ * appropriate. There must be at least js::UINT32_CHAR_BUFFER_LENGTH elements
+ * before |end| to avoid buffer underflow. The start of the characters written
+ * is returned and is necessarily before |end|.
+ */
+template <typename T>
+inline mozilla::RangedPtr<T> BackfillIndexInCharBuffer(
+ uint32_t index, mozilla::RangedPtr<T> end) {
+#ifdef DEBUG
+ /*
+ * Assert that the buffer we're filling will hold as many characters as we
+ * could write out, by dereferencing the index that would hold the most
+ * significant digit.
+ */
+ (void)*(end - UINT32_CHAR_BUFFER_LENGTH);
+#endif
+
+ do {
+ uint32_t next = index / 10, digit = index % 10;
+ *--end = '0' + digit;
+ index = next;
+ } while (index > 0);
+
+ return end;
+}
+
+bool IndexToIdSlow(JSContext* cx, uint32_t index, MutableHandleId idp);
+
+inline bool IndexToId(JSContext* cx, uint32_t index, MutableHandleId idp) {
+ if (index <= PropertyKey::IntMax) {
+ idp.set(PropertyKey::Int(index));
+ return true;
+ }
+
+ return IndexToIdSlow(cx, index, idp);
+}
+
+static MOZ_ALWAYS_INLINE JSLinearString* IdToString(JSContext* cx, jsid id) {
+ if (id.isString()) {
+ return id.toAtom();
+ }
+
+ if (MOZ_LIKELY(id.isInt())) {
+ return Int32ToString<CanGC>(cx, id.toInt());
+ }
+
+ RootedValue idv(cx, IdToValue(id));
+ JSString* str = ToStringSlow<CanGC>(cx, idv);
+ if (!str) {
+ return nullptr;
+ }
+
+ return str->ensureLinear(cx);
+}
+
+inline Handle<PropertyName*> TypeName(JSType type, const JSAtomState& names) {
+ MOZ_ASSERT(type < JSTYPE_LIMIT);
+ static_assert(offsetof(JSAtomState, undefined) +
+ JSTYPE_LIMIT * sizeof(ImmutableTenuredPtr<PropertyName*>) <=
+ sizeof(JSAtomState));
+ static_assert(JSTYPE_UNDEFINED == 0);
+ return (&names.undefined)[type];
+}
+
+inline Handle<PropertyName*> ClassName(JSProtoKey key, JSAtomState& atomState) {
+ MOZ_ASSERT(key < JSProto_LIMIT);
+ static_assert(offsetof(JSAtomState, Null) +
+ JSProto_LIMIT *
+ sizeof(ImmutableTenuredPtr<PropertyName*>) <=
+ sizeof(JSAtomState));
+ static_assert(JSProto_Null == 0);
+ return (&atomState.Null)[key];
+}
+
+} // namespace js
+
+#endif /* vm_JSAtom_inl_h */