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Bug 749535 - Part 1: Implement JS_UnwrapObjectAs*Array(). (r=bhackett)

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This commit is contained in:
Eric Faust 2012-07-31 20:05:19 -07:00
parent 5bbb4f7f06
commit 67031a4d40
2 changed files with 102 additions and 0 deletions
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29
js/src/jsfriendapi.h
View File

@ -1093,6 +1093,35 @@ JS_IsFloat32Array(JSObject *obj, JSContext *cx);
extern JS_FRIEND_API(JSBool)
JS_IsFloat64Array(JSObject *obj, JSContext *cx);
/*
* Unwrap Typed arrays all at once. Return NULL without throwing if obj cannot
* be viewed as the appropriate typed array, or the typed array object on
* success, after filling the two out parameters.
*/
extern JS_FRIEND_API(JSObject *)
JS_GetObjectAsInt8Array(JSContext *cx, JSObject *obj, uint32_t *length, int8_t **data);
extern JS_FRIEND_API(JSObject *)
JS_GetObjectAsUint8Array(JSContext *cx, JSObject *obj, uint32_t *length, uint8_t **data);
extern JS_FRIEND_API(JSObject *)
JS_GetObjectAsUint8ClampedArray(JSContext *cx, JSObject *obj, uint32_t *length, uint8_t **data);
extern JS_FRIEND_API(JSObject *)
JS_GetObjectAsInt16Array(JSContext *cx, JSObject *obj, uint32_t *length, int16_t **data);
extern JS_FRIEND_API(JSObject *)
JS_GetObjectAsUint16Array(JSContext *cx, JSObject *obj, uint32_t *length, uint16_t **data);
extern JS_FRIEND_API(JSObject *)
JS_GetObjectAsInt32Array(JSContext *cx, JSObject *obj, uint32_t *length, int32_t **data);
extern JS_FRIEND_API(JSObject *)
JS_GetObjectAsUint32Array(JSContext *cx, JSObject *obj, uint32_t *length, uint32_t **data);
extern JS_FRIEND_API(JSObject *)
JS_GetObjectAsFloat32Array(JSContext *cx, JSObject *obj, uint32_t *length, float **data);
extern JS_FRIEND_API(JSObject *)
JS_GetObjectAsFloat64Array(JSContext *cx, JSObject *obj, uint32_t *length, double **data);
extern JS_FRIEND_API(JSObject *)
JS_GetObjectAsArrayBufferView(JSContext *cx, JSObject *obj, uint32_t *length, uint8_t **data);
extern JS_FRIEND_API(JSObject *)
JS_GetObjectAsArrayBuffer(JSContext *cx, JSObject *obj, uint32_t *length, uint8_t **data);
/*
* Get the type of elements in a typed array.
*

73
js/src/jstypedarray.cpp
View File

@ -2936,6 +2936,40 @@ IMPL_TYPED_ARRAY_JSAPI_CONSTRUCTORS(Uint32, uint32_t)
IMPL_TYPED_ARRAY_JSAPI_CONSTRUCTORS(Float32, float)
IMPL_TYPED_ARRAY_JSAPI_CONSTRUCTORS(Float64, double)
#define IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Name, ExternalType, InternalType) \
JS_FRIEND_API(JSObject *) JS_GetObjectAs ## Name ## Array(JSContext *cx, \
JSObject *obj, \
uint32_t *length, \
ExternalType **data) \
{ \
if (obj->isWrapper()) { \
MOZ_ASSERT(!cx->isExceptionPending()); \
if (!(obj = UnwrapObjectChecked(cx, obj))) { \
cx->clearPendingException(); \
return NULL; \
} \
} \
\
Class *clasp = obj->getClass(); \
if (clasp != &TypedArray::classes[TypedArrayTemplate<InternalType>::ArrayTypeID()]) \
return NULL; \
\
*length = obj->getSlot(TypedArray::FIELD_LENGTH).toInt32(); \
*data = static_cast<ExternalType *>(TypedArray::viewData(obj)); \
\
return obj; \
}
IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Int8, int8_t, int8_t)
IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Uint8, uint8_t, uint8_t)
IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Uint8Clamped, uint8_t, uint8_clamped)
IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Int16, int16_t, int16_t)
IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Uint16, uint16_t, uint16_t)
IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Int32, int32_t, int32_t)
IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Uint32, uint32_t, uint32_t)
IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Float32, float, float)
IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Float64, double, double)
#define IMPL_TYPED_ARRAY_PROTO_CLASS(_typedArray) \
{ \
#_typedArray "Prototype", \
@ -3558,3 +3592,42 @@ JS_GetArrayBufferViewByteLength(JSObject *obj, JSContext *cx)
? obj->asDataView().byteLength()
: TypedArray::byteLengthValue(obj).toInt32();
}
JS_FRIEND_API(JSObject *)
JS_GetObjectAsArrayBufferView(JSContext *cx, JSObject *obj,
uint32_t *length, uint8_t **data)
{
if (obj->isWrapper()) {
if (!(obj = UnwrapObjectChecked(cx, obj))) {
cx->clearPendingException();
return NULL;
}
}
if (!(obj->isTypedArray() || obj->isDataView()))
return NULL;
*length = obj->isDataView() ? obj->asDataView().byteLength()
: TypedArray::byteLengthValue(obj).toInt32();
*data = static_cast<uint8_t *>(obj->isDataView() ? obj->asDataView().dataPointer()
: TypedArray::viewData(obj));
return obj;
}
JS_FRIEND_API(JSObject *)
JS_GetObjectAsArrayBuffer(JSContext *cx, JSObject *obj, uint32_t *length, uint8_t **data)
{
if (obj->isWrapper()) {
if (!(obj = UnwrapObjectChecked(cx, obj))) {
cx->clearPendingException();
return NULL;
}
}
if (!obj->isArrayBuffer())
return NULL;
*length = obj->asArrayBuffer().byteLength();
*data = obj->asArrayBuffer().dataPointer();
return obj;
}