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TypedArrayObject.h
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TypedArrayObject.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 vm_TypedArrayObject_h
#define vm_TypedArrayObject_h
#include "mozilla/Attributes.h"
#include "mozilla/TextUtils.h"
#include "gc/Barrier.h"
#include "js/Class.h"
#include "vm/ArrayBufferObject.h"
#include "vm/ArrayBufferViewObject.h"
#include "vm/JSObject.h"
#include "vm/SharedArrayObject.h"
#define JS_FOR_EACH_TYPED_ARRAY(MACRO) \
MACRO(int8_t, Int8) \
MACRO(uint8_t, Uint8) \
MACRO(int16_t, Int16) \
MACRO(uint16_t, Uint16) \
MACRO(int32_t, Int32) \
MACRO(uint32_t, Uint32) \
MACRO(float, Float32) \
MACRO(double, Float64) \
MACRO(uint8_clamped, Uint8Clamped) \
MACRO(int64_t, BigInt64) \
MACRO(uint64_t, BigUint64)
namespace js {
/*
* TypedArrayObject
*
* The non-templated base class for the specific typed implementations.
* This class holds all the member variables that are used by
* the subclasses.
*/
class TypedArrayObject : public ArrayBufferViewObject {
public:
static constexpr int lengthOffset() {
return NativeObject::getFixedSlotOffset(LENGTH_SLOT);
}
static constexpr int byteOffsetOffset() {
return NativeObject::getFixedSlotOffset(BYTEOFFSET_SLOT);
}
static constexpr int dataOffset() {
return NativeObject::getPrivateDataOffset(DATA_SLOT);
}
static_assert(js::detail::TypedArrayLengthSlot == LENGTH_SLOT,
"bad inlined constant in jsfriendapi.h");
static bool sameBuffer(Handle<TypedArrayObject*> a,
Handle<TypedArrayObject*> b) {
// Inline buffers.
if (!a->hasBuffer() || !b->hasBuffer()) {
return a.get() == b.get();
}
// Shared buffers.
if (a->isSharedMemory() && b->isSharedMemory()) {
return a->bufferShared()->globalID() == b->bufferShared()->globalID();
}
return a->bufferEither() == b->bufferEither();
}
static const Class classes[Scalar::MaxTypedArrayViewType];
static const Class protoClasses[Scalar::MaxTypedArrayViewType];
static const Class sharedTypedArrayPrototypeClass;
static const Class* classForType(Scalar::Type type) {
MOZ_ASSERT(type < Scalar::MaxTypedArrayViewType);
return &classes[type];
}
static const Class* protoClassForType(Scalar::Type type) {
MOZ_ASSERT(type < Scalar::MaxTypedArrayViewType);
return &protoClasses[type];
}
static constexpr size_t FIXED_DATA_START = DATA_SLOT + 1;
// For typed arrays which can store their data inline, the array buffer
// object is created lazily.
static constexpr uint32_t INLINE_BUFFER_LIMIT =
(NativeObject::MAX_FIXED_SLOTS - FIXED_DATA_START) * sizeof(Value);
static inline gc::AllocKind AllocKindForLazyBuffer(size_t nbytes);
inline Scalar::Type type() const;
inline size_t bytesPerElement() const;
static Value byteOffsetValue(const TypedArrayObject* tarr) {
Value v = tarr->getFixedSlot(BYTEOFFSET_SLOT);
MOZ_ASSERT(v.toInt32() >= 0);
return v;
}
static Value byteLengthValue(const TypedArrayObject* tarr) {
return Int32Value(tarr->getFixedSlot(LENGTH_SLOT).toInt32() *
tarr->bytesPerElement());
}
static Value lengthValue(const TypedArrayObject* tarr) {
return tarr->getFixedSlot(LENGTH_SLOT);
}
static bool ensureHasBuffer(JSContext* cx, Handle<TypedArrayObject*> tarray);
uint32_t byteOffset() const { return byteOffsetValue(this).toInt32(); }
uint32_t byteLength() const { return byteLengthValue(this).toInt32(); }
uint32_t length() const { return lengthValue(this).toInt32(); }
bool hasInlineElements() const;
void setInlineElements();
uint8_t* elementsRaw() const {
return *(uint8_t**)((((char*)this) + js::TypedArrayObject::dataOffset()));
}
uint8_t* elements() const {
assertZeroLengthArrayData();
return elementsRaw();
}
#ifdef DEBUG
void assertZeroLengthArrayData() const;
#else
void assertZeroLengthArrayData() const {};
#endif
template <AllowGC allowGC>
bool getElement(JSContext* cx, uint32_t index,
typename MaybeRooted<Value, allowGC>::MutableHandleType val);
bool getElementPure(uint32_t index, Value* vp);
/*
* Copy all elements from this typed array to vp. vp must point to rooted
* memory.
*/
static bool getElements(JSContext* cx, Handle<TypedArrayObject*> tarray,
Value* vp);
static bool GetTemplateObjectForNative(JSContext* cx, Native native,
const JS::HandleValueArray args,
MutableHandleObject res);
/*
* Byte length above which created typed arrays will have singleton types.
* This only applies to typed arrays created with an existing ArrayBuffer and
* when not inlined from Ion.
*/
static constexpr uint32_t SINGLETON_BYTE_LENGTH = 1024 * 1024 * 10;
static bool isOriginalLengthGetter(Native native);
static bool isOriginalByteOffsetGetter(Native native);
static void finalize(FreeOp* fop, JSObject* obj);
static size_t objectMoved(JSObject* obj, JSObject* old);
/* Initialization bits */
template <Value ValueGetter(const TypedArrayObject* tarr)>
static bool GetterImpl(JSContext* cx, const CallArgs& args) {
MOZ_ASSERT(is(args.thisv()));
args.rval().set(
ValueGetter(&args.thisv().toObject().as<TypedArrayObject>()));
return true;
}
// ValueGetter is a function that takes an unwrapped typed array object and
// returns a Value. Given such a function, Getter<> is a native that
// retrieves a given Value, probably from a slot on the object.
template <Value ValueGetter(const TypedArrayObject* tarr)>
static bool Getter(JSContext* cx, unsigned argc, Value* vp) {
CallArgs args = CallArgsFromVp(argc, vp);
return CallNonGenericMethod<is, GetterImpl<ValueGetter>>(cx, args);
}
static const JSFunctionSpec protoFunctions[];
static const JSPropertySpec protoAccessors[];
static const JSFunctionSpec staticFunctions[];
static const JSPropertySpec staticProperties[];
/* Accessors and functions */
static bool is(HandleValue v);
static bool set(JSContext* cx, unsigned argc, Value* vp);
bool convertForSideEffect(JSContext* cx, HandleValue v) const;
private:
static bool set_impl(JSContext* cx, const CallArgs& args);
};
MOZ_MUST_USE bool TypedArray_bufferGetter(JSContext* cx, unsigned argc,
Value* vp);
extern TypedArrayObject* NewTypedArrayWithTemplateAndLength(
JSContext* cx, HandleObject templateObj, int32_t len);
extern TypedArrayObject* NewTypedArrayWithTemplateAndArray(
JSContext* cx, HandleObject templateObj, HandleObject array);
extern TypedArrayObject* NewTypedArrayWithTemplateAndBuffer(
JSContext* cx, HandleObject templateObj, HandleObject arrayBuffer,
HandleValue byteOffset, HandleValue length);
inline bool IsTypedArrayClass(const Class* clasp) {
return &TypedArrayObject::classes[0] <= clasp &&
clasp < &TypedArrayObject::classes[Scalar::MaxTypedArrayViewType];
}
inline Scalar::Type GetTypedArrayClassType(const Class* clasp) {
MOZ_ASSERT(IsTypedArrayClass(clasp));
return static_cast<Scalar::Type>(clasp - &TypedArrayObject::classes[0]);
}
bool IsTypedArrayConstructor(const JSObject* obj);
bool IsTypedArrayConstructor(HandleValue v, uint32_t type);
// In WebIDL terminology, a BufferSource is either an ArrayBuffer or a typed
// array view. In either case, extract the dataPointer/byteLength.
bool IsBufferSource(JSObject* object, SharedMem<uint8_t*>* dataPointer,
size_t* byteLength);
inline Scalar::Type TypedArrayObject::type() const {
return GetTypedArrayClassType(getClass());
}
inline size_t TypedArrayObject::bytesPerElement() const {
return Scalar::byteSize(type());
}
// Return value is whether the string is some integer. If the string is an
// integer which is not representable as a uint64_t, the return value is true
// and the resulting index is UINT64_MAX.
template <typename CharT>
bool StringIsTypedArrayIndex(const CharT* s, size_t length, uint64_t* indexp);
inline bool IsTypedArrayIndex(jsid id, uint64_t* indexp) {
if (JSID_IS_INT(id)) {
int32_t i = JSID_TO_INT(id);
MOZ_ASSERT(i >= 0);
*indexp = static_cast<uint64_t>(i);
return true;
}
if (MOZ_UNLIKELY(!JSID_IS_STRING(id))) {
return false;
}
JS::AutoCheckCannotGC nogc;
JSAtom* atom = JSID_TO_ATOM(id);
size_t length = atom->length();
if (atom->hasLatin1Chars()) {
const Latin1Char* s = atom->latin1Chars(nogc);
if (!mozilla::IsAsciiDigit(*s) && *s != '-') {
return false;
}
return StringIsTypedArrayIndex(s, length, indexp);
}
const char16_t* s = atom->twoByteChars(nogc);
if (!mozilla::IsAsciiDigit(*s) && *s != '-') {
return false;
}
return StringIsTypedArrayIndex(s, length, indexp);
}
bool SetTypedArrayElement(JSContext* cx, Handle<TypedArrayObject*> obj,
uint64_t index, HandleValue v,
ObjectOpResult& result);
/*
* Implements [[DefineOwnProperty]] for TypedArrays when the property
* key is a TypedArray index.
*/
bool DefineTypedArrayElement(JSContext* cx, HandleObject arr, uint64_t index,
Handle<PropertyDescriptor> desc,
ObjectOpResult& result);
static inline constexpr unsigned TypedArrayShift(Scalar::Type viewType) {
switch (viewType) {
case Scalar::Int8:
case Scalar::Uint8:
case Scalar::Uint8Clamped:
return 0;
case Scalar::Int16:
case Scalar::Uint16:
return 1;
case Scalar::Int32:
case Scalar::Uint32:
case Scalar::Float32:
return 2;
case Scalar::BigInt64:
case Scalar::BigUint64:
case Scalar::Int64:
case Scalar::Float64:
return 3;
default:
MOZ_CRASH("Unexpected array type");
}
}
static inline unsigned TypedArrayElemSize(Scalar::Type viewType) {
return 1u << TypedArrayShift(viewType);
}
// Assign
//
// target[targetOffset] = unsafeSrcCrossCompartment[0]
// ...
// target[targetOffset + unsafeSrcCrossCompartment.length - 1] =
// unsafeSrcCrossCompartment[unsafeSrcCrossCompartment.length - 1]
//
// where the source element range doesn't overlap the target element range in
// memory.
extern void SetDisjointTypedElements(
TypedArrayObject* target, uint32_t targetOffset,
TypedArrayObject* unsafeSrcCrossCompartment);
} // namespace js
template <>
inline bool JSObject::is<js::TypedArrayObject>() const {
return js::IsTypedArrayClass(getClass());
}
#endif /* vm_TypedArrayObject_h */