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Issue #1442 - Part 1: Change ArrayBufferCopyData self-hosting intrinsic to take a start offset for the destination. This will be needed to manage stream chunks. https://bugzilla.mozilla.org/show_bug.cgi?id=1272697

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This commit is contained in:
Brian Smith 2023-09-27 09:36:44 -05:00 • committed by roytam1
commit 90ca1f569a
7 changed files with 28 additions and 26 deletions
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6
js/src/builtin/TypedArray.js
View file

@ -2,8 +2,6 @@
* 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/. */
#include "TypedObjectConstants.h"
function ViewedArrayBufferIfReified(tarray) {
assert(IsTypedArray(tarray), "non-typed array asked for its buffer");
@ -1781,7 +1779,7 @@ function ArrayBufferSlice(start, end) {
ThrowTypeError(JSMSG_TYPED_ARRAY_DETACHED);
// Steps 19-21.
ArrayBufferCopyData(new_, O, first | 0, newLen | 0, isWrapped);
ArrayBufferCopyData(new_, 0, O, first | 0, newLen | 0, isWrapped);
// Step 22.
return new_;
@ -1863,7 +1861,7 @@ function SharedArrayBufferSlice(start, end) {
ThrowTypeError(JSMSG_SHORT_SHARED_ARRAY_BUFFER_RETURNED, newLen, actualLen);
// Steps 16-18.
SharedArrayBufferCopyData(new_, O, first | 0, newLen | 0, isWrapped);
SharedArrayBufferCopyData(new_, 0, O, first | 0, newLen | 0, isWrapped);
// Step 19.
return new_;

1
js/src/builtin/Utilities.js
View file

@ -23,6 +23,7 @@
*/
#include "SelfHostingDefines.h"
#include "TypedObjectConstants.h"
// Assertions and debug printing, defined here instead of in the header above
// to make `assert` invisible to C++.

9
js/src/vm/ArrayBufferObject.cpp
View file

@ -1255,15 +1255,16 @@ ArrayBufferObject::finalize(FreeOp* fop, JSObject* obj)
}
/* static */ void
ArrayBufferObject::copyData(Handle<ArrayBufferObject*> toBuffer,
Handle<ArrayBufferObject*> fromBuffer,
uint32_t fromIndex, uint32_t count)
ArrayBufferObject::copyData(Handle<ArrayBufferObject*> toBuffer, uint32_t toIndex,
Handle<ArrayBufferObject*> fromBuffer, uint32_t fromIndex,
uint32_t count)
{
MOZ_ASSERT(toBuffer->byteLength() >= count);
MOZ_ASSERT(toBuffer->byteLength() >= toIndex + count);
MOZ_ASSERT(fromBuffer->byteLength() >= fromIndex);
MOZ_ASSERT(fromBuffer->byteLength() >= fromIndex + count);
memcpy(toBuffer->dataPointer(), fromBuffer->dataPointer() + fromIndex, count);
memcpy(toBuffer->dataPointer() + toIndex, fromBuffer->dataPointer() + fromIndex, count);
}
/* static */ void

6
js/src/vm/ArrayBufferObject.h
View file

@ -261,9 +261,9 @@ class ArrayBufferObject : public ArrayBufferObjectMaybeShared
template<typename T>
static bool createTypedArrayFromBuffer(JSContext* cx, unsigned argc, Value* vp);
static void copyData(Handle<ArrayBufferObject*> toBuffer,
Handle<ArrayBufferObject*> fromBuffer,
uint32_t fromIndex, uint32_t count);
static void copyData(Handle<ArrayBufferObject*> toBuffer, uint32_t toIndex,
Handle<ArrayBufferObject*> fromBuffer, uint32_t fromIndex,
uint32_t count);
static void trace(JSTracer* trc, JSObject* obj);
static void objectMoved(JSObject* obj, const JSObject* old);

17
js/src/vm/SelfHosting.cpp
View file

@ -1098,9 +1098,9 @@ static bool
intrinsic_ArrayBufferCopyData(JSContext* cx, unsigned argc, Value* vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
MOZ_ASSERT(args.length() == 5);
MOZ_ASSERT(args.length() == 6);
bool isWrapped = args[4].toBoolean();
bool isWrapped = args[5].toBoolean();
Rooted<T*> toBuffer(cx);
if (!isWrapped) {
toBuffer = &args[0].toObject().as<T>();
@ -1114,11 +1114,12 @@ intrinsic_ArrayBufferCopyData(JSContext* cx, unsigned argc, Value* vp)
}
toBuffer = toBufferObj.as<T>();
}
Rooted<T*> fromBuffer(cx, &args[1].toObject().as<T>());
uint32_t fromIndex = uint32_t(args[2].toInt32());
uint32_t count = uint32_t(args[3].toInt32());
uint32_t toIndex = uint32_t(args[1].toInt32());
Rooted<T*> fromBuffer(cx, &args[2].toObject().as<T>());
uint32_t fromIndex = uint32_t(args[3].toInt32());
uint32_t count = uint32_t(args[4].toInt32());
T::copyData(toBuffer, fromBuffer, fromIndex, count);
T::copyData(toBuffer, toIndex, fromBuffer, fromIndex, count);
args.rval().setUndefined();
return true;
@ -2426,14 +2427,14 @@ static const JSFunctionSpec intrinsic_functions[] = {
intrinsic_PossiblyWrappedArrayBufferByteLength<ArrayBufferObject>, 1,0,
IntrinsicPossiblyWrappedArrayBufferByteLength),
JS_FN("ArrayBufferCopyData",
intrinsic_ArrayBufferCopyData<ArrayBufferObject>, 5,0),
intrinsic_ArrayBufferCopyData<ArrayBufferObject>, 6,0),
JS_FN("SharedArrayBufferByteLength",
intrinsic_ArrayBufferByteLength<SharedArrayBufferObject>, 1,0),
JS_FN("PossiblyWrappedSharedArrayBufferByteLength",
intrinsic_PossiblyWrappedArrayBufferByteLength<SharedArrayBufferObject>, 1,0),
JS_FN("SharedArrayBufferCopyData",
intrinsic_ArrayBufferCopyData<SharedArrayBufferObject>, 5,0),
intrinsic_ArrayBufferCopyData<SharedArrayBufferObject>, 6,0),
JS_FN("IsUint8TypedArray", intrinsic_IsUint8TypedArray, 1,0),
JS_FN("IsInt8TypedArray", intrinsic_IsInt8TypedArray, 1,0),

9
js/src/vm/SharedArrayObject.cpp
View file

@ -331,15 +331,16 @@ SharedArrayBufferObject::addSizeOfExcludingThis(JSObject* obj, mozilla::MallocSi
}
/* static */ void
SharedArrayBufferObject::copyData(Handle<SharedArrayBufferObject*> toBuffer,
Handle<SharedArrayBufferObject*> fromBuffer,
uint32_t fromIndex, uint32_t count)
SharedArrayBufferObject::copyData(Handle<SharedArrayBufferObject*> toBuffer, uint32_t toIndex,
Handle<SharedArrayBufferObject*> fromBuffer, uint32_t fromIndex,
uint32_t count)
{
MOZ_ASSERT(toBuffer->byteLength() >= count);
MOZ_ASSERT(toBuffer->byteLength() >= toIndex + count);
MOZ_ASSERT(fromBuffer->byteLength() >= fromIndex);
MOZ_ASSERT(fromBuffer->byteLength() >= fromIndex + count);
jit::AtomicOperations::memcpySafeWhenRacy(toBuffer->dataPointerShared(),
jit::AtomicOperations::memcpySafeWhenRacy(toBuffer->dataPointerShared() + toIndex,
fromBuffer->dataPointerShared() + fromIndex,
count);
}

6
js/src/vm/SharedArrayObject.h
View file

@ -146,9 +146,9 @@ class SharedArrayBufferObject : public ArrayBufferObjectMaybeShared
static void addSizeOfExcludingThis(JSObject* obj, mozilla::MallocSizeOf mallocSizeOf,
JS::ClassInfo* info);
static void copyData(Handle<SharedArrayBufferObject*> toBuffer,
Handle<SharedArrayBufferObject*> fromBuffer,
uint32_t fromIndex, uint32_t count);
static void copyData(Handle<SharedArrayBufferObject*> toBuffer, uint32_t toIndex,
Handle<SharedArrayBufferObject*> fromBuffer, uint32_t fromIndex,
uint32_t count);
SharedArrayRawBuffer* rawBufferObject() const;