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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
#ifndef vm_JSAtomUtils_inl_h
#define vm_JSAtomUtils_inl_h
#include "vm/JSAtomUtils.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, gc::Heap heap = gc::Heap::Default) {
if (id.isString()) {
return id.toAtom();
}
if (MOZ_LIKELY(id.isInt())) {
return Int32ToStringWithHeap<CanGC>(cx, id.toInt(), heap);
}
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_JSAtomUtils_inl_h */