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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/FloatingPoint.h"
#include "mozilla/RangedPtr.h"
#include "jsnum.h"
#include "gc/MaybeRooted.h"
#include "vm/Runtime.h"
#include "vm/StringType.h"
namespace js {
inline jsid AtomToId(JSAtom* atom) {
static_assert(JSID_INT_MIN == 0);
uint32_t index;
if (atom->isIndex(&index) && index <= JSID_INT_MAX) {
return INT_TO_JSID(int32_t(index));
}
return JS::PropertyKey::fromNonIntAtom(atom);
}
// Use the NameToId method instead!
inline jsid AtomToId(PropertyName* name) = delete;
MOZ_ALWAYS_INLINE bool ValueToIntId(const Value& v, jsid* id) {
int32_t i;
if (v.isInt32()) {
i = v.toInt32();
} else if (!v.isDouble() || !mozilla::NumberEqualsInt32(v.toDouble(), &i)) {
return false;
}
if (!INT_FITS_IN_JSID(i)) {
return false;
}
*id = INT_TO_JSID(i);
return true;
}
inline bool ValueToIdPure(const Value& v, jsid* id) {
if (v.isString()) {
if (v.toString()->isAtom()) {
*id = AtomToId(&v.toString()->asAtom());
return true;
}
return false;
}
if (ValueToIntId(v, id)) {
return true;
}
if (v.isSymbol()) {
*id = SYMBOL_TO_JSID(v.toSymbol());
return true;
}
return false;
}
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()) {
if (v.toString()->isAtom()) {
idp.set(AtomToId(&v.toString()->asAtom()));
return true;
}
} else {
if (ValueToIntId(v, idp.address())) {
return true;
}
if (v.isSymbol()) {
idp.set(SYMBOL_TO_JSID(v.toSymbol()));
return true;
}
}
JSAtom* atom = ToAtom<allowGC>(cx, v);
if (!atom) {
return false;
}
idp.set(AtomToId(atom));
return true;
}
/*
* 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 <= JSID_INT_MAX) {
idp.set(INT_TO_JSID(index));
return true;
}
return IndexToIdSlow(cx, index, idp);
}
static MOZ_ALWAYS_INLINE JSLinearString* IdToString(JSContext* cx, jsid id) {
if (JSID_IS_STRING(id)) {
return JSID_TO_ATOM(id);
}
if (MOZ_LIKELY(JSID_IS_INT(id))) {
return Int32ToString<CanGC>(cx, JSID_TO_INT(id));
}
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(ImmutablePropertyNamePtr) <=
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(ImmutablePropertyNamePtr) <=
sizeof(JSAtomState));
static_assert(JSProto_Null == 0);
return (&atomState.Null)[key];
}
} // namespace js
#endif /* vm_JSAtom_inl_h */